SYSTEM AND METHOD FOR REQUESTING BEAM ADJUSTMENT

专利摘要:
an apparatus can determine a first set of parameters associated with a first crack procedure, the first set of parameters being associated with beam failure recovery for a first eu in a cell. the device can send the first set of parameters to the first eu. another device can receive the first set of parameters associated with a first crack procedure. the other device can receive, from the first device, a second set of parameters associated with a second crack procedure. the other device can generate a crack preamble based on the first set of parameters or based on the second set of parameters. the other device can send the generated crack preamble to the first device.
公开号:BR112019014375A2
申请号:R112019014375-0
申请日:2018-01-11
公开日:2020-02-11
发明作者:Nazmul Islam Muhammad；Luo Tao；Cezanne Juergen；Subramanian Sundar；Sampath Ashwin；Sadiq Bilal；Li Junyi
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

SYSTEM AND METHOD FOR REQUESTING BEAM ADJUSTMENT
CROSS REFERENCE TO RELATED ORDERS [001] This request claims the benefit of
solicitation Provisional U.S. No. 62 / 447,386, entitled SYSTEM AND METHOD FOR BEAM INDEX and deposited in 17 of January 2017, the solicitation Provisional U.S. At the. 62 / 557,082, entitled SYSTEM AND METHOD FOR BEAM
ADJUSTMENT REQUEST is filed on September 11, 2017, US Provisional Application No. 62 / 567,161, entitled SYSTEM AND METHOD FOR BEAM ADJUSTMENT REQUEST and filed on October 2, 2017, and US Patent Application No. 15 / 867,603, entitled SYSTEM AND METHOD FOR BEAM ADJUSTMENT REQUEST and filed on January 10, 2018, the disclosures of which are expressly incorporated by reference in this document in their entirety.
FUNDAMENTALS
Field [002] The present disclosure generally refers to communication systems and, more particularly, to user equipment that can inform a base station of a beam adjustment request.
Background [003] Wireless communication systems are widely deployed to provide various telecommunications services, such as telephony, video, data, messaging and broadcast. Typical wireless communication systems can employ multiple access technologies capable of supporting communication with multiple users,
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2/133 sharing available system resources. Examples
of such technologies multiple access include systems in access multiple per division of code (CDMA), systems in access multiple per division of time (TDMA), systems in
frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access systems (SC-FDMA) and synchronous code division multiple access systems with time division (TD-SCDMA).
[004] These multiple access technologies have been adopted in several telecommunication standards to provide a common protocol that allows different wireless devices to communicate at the municipal, national, regional and even global levels. An example of a telecommunication standard is Long Term Evolution (LTE). LTE is a set of enhancements to the mobile standard of the Universal Mobile Telecommunications System (UMTS), promulgated by the Third Generation Partnership Project (3GPP). LTE was designed to support mobile broadband access through enhanced spectral efficiency, reduced costs and improved services using OFDMA on the downlink, SC-FDMA on the uplink and antenna technology for multiple inputs and multiple outputs (MIMO). However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in LTE technology.
[005] Another example of a telecommunication standard is the Novo Rádio (NR) 5G. The NR 5G is part of a continuous evolution of mobile broadband promulgated by the
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3/133
3GPP to meet new requirements associated with latency, reliability, security, scalability (for example, with Internet of Things (loT)) and other requirements. Some aspects of the NR 5G may be based on the LTE 4G standard. There is a need for further improvements in NR 5G technology. These improvements may also apply to other multiaccess technologies and to telecommunication standards that employ these technologies.
SUMMARY [006] The following is a simplified summary of one or more aspects, in order to provide a basic understanding of such aspects. This summary is not a comprehensive overview of all aspects covered, and is not intended to identify key or critical elements of all aspects, nor to outline the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified way, as a prelude to the more detailed description presented later.
[007] The loss of travel can be relatively high in millimeter wave (mmW) systems. Transmission can be directional to mitigate loss of travel. A base station can transmit one or more beam reference signals sweeping in all directions, so that a user equipment (UE) can identify a better coarse beam. In addition, the base station can transmit a beam refinement request signal so that the UE can track fine beams. If a coarse beam identified by the UE changes, the UE may need to
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4/133 to inform the base station so that the base station can train one or more new thin beams for the UE.
[008] In several respects, the UE can send a best beam index and a corresponding beam refinement reference signal session request to the base station in a subframe reserved for a random access channel (RACH). The UE can occupy one or more shades reserved for RACH. In addition, the UE can occupy tones that are reserved for programming requests, but not for RACH transmission.
[009] In one aspect of the disclosure, a method, a computer-readable medium and an apparatus are provided. The apparatus can be configured to determine a first set of parameters associated with a first RACH procedure, the first set of parameters being associated with beam failure recovery for a first UE in a cell. The apparatus can send the first set of parameters to the first UE. In one aspect, the first set of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power received associated with the first RACH procedure, a number of cyclical displacements for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first
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5/133 RACH procedure. The apparatus can determine a second set of parameters associated with a second RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, cell reselection, loss of timing synchronization or handover. The apparatus can send the second set of parameters in the cell for use by a second UE. In one aspect, the first UE is time-synchronized in the cell, and the second UE is not time-synchronized in the cell. In one respect, the number of cyclic offsets available for each root sequence in the first set of RACH parameters is greater than in the second set of parameters. The apparatus can receive, from the first UE based on the first set of parameters, a first RACH preamble in a set of RACH resources, the first RACH preamble being associated with beam failure recovery, and receive, from the second UE based on the second set of parameters, a second RACH preamble in the set of RACH resources. The apparatus can identify a beam index for communication with the first UE based on the receipt of the first RACH preamble. In one aspect, the second set of parameters is sent in a handover message, a minimum system information message (RMSI) or another system information message (OSI). In one aspect, the first set of parameters is sent in a radio resource control (RRC) message.
[0010] In another aspect of the disclosure, another method, another computer-readable medium, and another device are provided. The other device can be configured to
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6/133 receive, from a base station, a first set of parameters associated with a first RACH procedure, the first RACH procedure being associated with the recovery of beam failure with the base station. The other device can receive, from the base station, a second set of parameters associated with a second RACH procedure, the second RACH procedure being associated with one of initial access, cell selection, cell re-selection, loss of synchronization of timing or handover. The other apparatus can generate a RACH preamble based on the first set of parameters or based on the second set of parameters. The other apparatus can send the generated RACH preamble to the base station.
[0011] For the fulfillment of previous and related purposes, the one or more aspects comprise the characteristics described below completely and particularly pointed out in the claims. The description that follows and the accompanying drawings present in detail certain illustrative features of one or more aspects. These characteristics are indicative, however, of just a few of the various ways in which the principles of various aspects can be employed, and this description is intended to include all of these aspects and their equivalents.
BRIEF DESCRIPTION OF THE DRAWINGS [0012] Figure 1 is a diagram that illustrates an example of a wireless communications system and an access network.
[0013] Figures 2A, 2B, 2C and 2D are diagrams that illustrate LTE examples of a DL frame structure,
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7/133 DL channels within the DL frame structure, a UL frame structure and UL channels within the UL frame structure, respectively.
[0014] Figure 3 is a diagram that illustrates an example of a base station and user equipment (UE) in an access network.
[0015] Figures 4A, 4B, 4C and 4D are diagrams of a wireless communications system.
[0016] Figures 5A to 5G illustrate diagrams of a wireless communications system.
[0017] The figure 6 is one diagram of a system in communications without thread.[0018] The figure 7 is one diagram of a system in communications without thread.[0019] The figure 8 is one flowchart of a method in communication without thread.[0020] The figure 9 and one flowchart of a method in communication without thread.[0021] The figure 10 is a flow chart conceptual in data that illustrates the flow in data between many different
media / components in an exemplary device.
[0022] Figure 11 is a diagram that illustrates an example of a hardware implementation for a device that employs a processing system.
[0023] Figure 12 is a conceptual data flow diagram illustrating the data flow between different media / components in an exemplary device.
[0024] Figure 13 is a diagram that illustrates an example of a hardware implementation for a device
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8/133 which employs a processing system.
[0025] The figure 14 is one flowchart in a method in communication without thread. [0026] The figure 15 is one flowchart in a method in communication without thread. [0027] The figure 16 is one flowchart in a method in communication without thread. [0028] The figure 17 is one flowchart in a method in communication without thread. [0029] The figure 18 is one diagram of a system in communication without thread. [0030] The figure 19 is one flowchart in a method in communication without thread. [0031] The figure 20 is one flowchart in a method in communication without thread. [0032] The figure 21 1 it's a diagram in flow of
conceptual data illustrating the data flow between different media / components in an exemplary device.
[0033] Figure 22 is a diagram that illustrates an example of a hardware implementation for a device that employs a processing system.
[0034] Figure 2 3 is a conceptual data flow diagram that illustrates the data flow between different media / components in an exemplary device.
[0035] Figure 24 is a diagram that illustrates an example of a hardware implementation for a device that employs a processing system.
DETAILED DESCRIPTION
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9/133 [0036] The detailed description presented below in relation to the attached drawings is intended to be a description of various configurations and is not intended to represent the only configurations in which the concepts described here can be practiced. The detailed description includes specific details for the purpose of providing a complete understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some cases, well-known structures and components are shown in the form of a block diagram to avoid obscuring such concepts.
[0037] Various aspects of telecommunications systems will now be presented with reference to various devices and methods. These devices and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as elements). These elements can be implemented using electronic hardware, computer software or any combination of them. Whether these elements are implemented as hardware or software depends on the particular application and the design restrictions imposed on the system as a whole.
[0038] By way of example, an element, or any part of an element, or any combination of elements can be implemented as a processing system that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units
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10/133 (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), bandwidth processors base, field programmable door arrangements (FPGAs), programmable logic devices (PLDs), state machines, door logic, discrete hardware circuits, and other suitable hardware configured to perform the various features described throughout this release. One or more processors in the processing system can run the software. The software must be interpreted broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects , executables, execution tasks, procedures, functions etc., if referred to as software, firmware, middleware, microcode, hardware description language or others.
[0039] Therefore, in one or more examples of modalities, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored or coded as one or more instructions or code in a computer-readable medium. Computer readable media include computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, these computer-readable media can
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11/133 comprise a random access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of types computer-readable means mentioned above, or any other means that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.
[0040] Figure 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes stations base 102, UEs 104 and an evolved packet nucleus (EPC) 160. Base stations 102 can include macro cells (high power cell base station) and / or small cells (low power cell base station). Macro cells include base stations. Small cells include femto cells, pico cells and micro cells.
[0041] The base stations 102 (collectively referred to as the Terrestrial Radio Access Network (E-UTRAN)) of the Universal Mobile Telecommunications System (UMTS) interfaces with EPC 160 through return transport channel links 132 (by example, interface Sl). In addition to other functions, base stations 102 can perform one or more of the following functions: user data transfer, radio channel encryption and decryption, integrity protection, header compression, control functions
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12/133 mobility (eg handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access messages (NAS), NAS node selection, synchronization, network sharing radio access (RAN), broadcast and multimedia multicast service (MBMS), subscriber tracking and equipment, RAN information management (RIM), paging, positioning, and delivery of warning messages. Base stations 102 can communicate directly or indirectly (for example, via EPC 160) with each other via return transport channel links 134 (for example, interface X2). The return transport channel links 134 can be wired or wireless.
[0042] Base stations 102 can communicate wirelessly with UEs 104. Each base station 102 can provide communication coverage for a geographic coverage area 110. There may be overlapping geographical coverage areas 110. For example, small cell 102 'may have a coverage area 110' that overlaps coverage area 110 of one or more macro base stations 102. A network that includes both small and macro cells may be known as a heterogeneous network. A heterogeneous network may also include the Domestic Evolved Node Bs (eNBs) (HeNBs), which can provide service to a restricted group known as a closed subscriber group (CSG). Communication links 120 between base stations 102 and UE 104 may include uplink (UL) transmission (also referred to as reverse link) from a UE 104 to a base station 102 and / or downlink (DL) transmission (also referred to as link
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13/133 direct) from a base station 102 to a UE 104. Communication links 120 may use multiple input and multiple output antenna (MIMO) technology, including spatial multiplexing, beam formation and / or transmission diversity. Communication links can be through one or more carriers. Base stations 102 / UEs 104 can use spectrum up to Y MHz (for example, 5, 10, 15, 20, 100 MHz) of bandwidth per carrier allocated in a carrier aggregation up to a total of Yx MHz (x carriers components) used for transmission in each direction, carriers may or may not be adjacent to each other. The allocation of carriers can be asymmetric with respect to DL and UL (for example, more or less carriers can be allocated to DL than to UL). Component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier can be referred to as a primary cell (P cell) and a secondary component carrier can be referred to as a secondary cell (S cell).
[0043] Certain UEs 104 can communicate with each other using the communication link 192 from device to device (D2D). The D2D 192 communication link can use the DL / UL WWAN spectrum. The D2D 192 communication link can use one or more side link channels, such as a physical side link broadcast channel (PSBCH), a physical side link discovery channel (PSDCH), a physical side link channel (PSSCH) and a physical side link control channel (PSCCH). D2D communication can be done through
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14/133 different wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11, LTE or NR standard.
[0044] The wireless communication system may also include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 through communication links 154 in an unlicensed frequency spectrum of 5 GHz When communicating on an unlicensed frequency spectrum, STAs 152 / AP 150 can perform a clean channel assessment (CCA) prior to communication, in order to determine if the channel is available.
[0045] Small cell 102 'can operate on a licensed and / or unlicensed frequency spectrum. When operating on an unlicensed frequency spectrum, small cell 102 'can employ NR and use the same unlicensed 5 GHz frequency spectrum as used by the Wi-Fi AP 150. Small cell 102', employing NR on a unlicensed frequency spectrum, can increase coverage and / or increase the capacity of the access network.
[0046] gNóB (gNB) 180 can operate at millimeter wave frequencies (mmW) and / or close to mmW frequencies in communication with UE 104. When gNB 180 operates at mmW or near mmW frequencies, gNB 180 can be referred to as an mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 mm and 10 mm. Radio waves in the band can be called millimeter waves. Close to mmW it can extend up to a frequency of 3 GHz
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15/133 with a wavelength of 100 mm. The superhigh frequency band (SHF) extends between 3 GHz and 30 GHz, also known as centimeter wave. Communications using the mmW / near-mmW radio frequency band have an extremely high loss of travel and a short range. The mmWM 180 base station can use beam format 184 with UE 104 to compensate for extremely high travel loss and short range.
[0047] EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Service Gateway 166, a Gateway 168, a Multicast Broadcast Service Center (BM-SC) 170 and a Gateway Packet Data Network (PDN) 172. MME 162 may be in communication with a Domestic Subscriber Server (HSS) 174. MME 162 is the control node that processes signaling between UEs 104 and EPC 160. Generally , MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transferred via Service Gateway 166, which in turn is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation, as well as other functions . PDN Gateway 172 and BM-SC 170 are connected to IP Services 176. IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and / or other IP Services . The BM-SC 170 can provide functions for providing and delivering MBMS user services. The BM-SC 170 can serve as an entry point for MBMS transmission from your content provider, can be used to authorize and start MBMS Carrier Services within
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16/133 of a public terrestrial mobile network (PLMN) and can be used to schedule MBMS transmissions. The MBMS 168 gateway can be used to distribute MBMS traffic to base stations 102 belonging to a single broadcast and multicast network (MBSFN) area broadcasting a particular service, and can be responsible for session management (start / stop) and by collecting cargo information related to eMBMS.
[0048] The base station can also be referred to as a gNB, Node B, evolved Node B (eNB), an access point, a base transceiver station, a base radio station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS) or some other suitable terminology. Base station 102 provides an access point for EPC 160 for a UE 104. Examples of UE 104 include a cell phone, a smartphone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant ( PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (for example, MP3 player), a camera, a game console, a tablet, a smart device , a usable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a health device, an implant, a display, or any other similarly functioning device. Some of the UE 104 can be referred to as loT devices (for example, parking meter, gas pump, toaster, vehicles, heart rate monitor, etc.). UE 104 can also be
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17/133 referred to as station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a telephone set, a user agent, a mobile client, a customer or some other suitable terminology.
[0049] Referring again to Figure 1, in certain respects, base station 180 can be configured to determine a first set of parameters 198 associated with a first RACH procedure, the first set of parameters being associated with recovery from beam to a first UE 104 in a cell. Base station 180 can send the first set of parameters 198 to the first UE 104. In one aspect, the first set of parameters 198 indicates at least one of a root sequence index associated with the first RACH procedure, an associated configuration index the first RACH procedure, a target power received associated with the first RACH procedure, a number of cyclic displacements for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, ramp step of power associated with the first RACH procedure, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure. Base station 180 can determine a second set of parameters associated with a second
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18/133 RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover. Base station 180 can send the second set of parameters in the cell for use by a second UE. In one aspect, the first UE 104 is time-synchronized in the cell, and the second UE is not time-synchronized in the cell. In one respect, the number of cyclic offsets available for each root sequence in the first set of RACH parameters is greater than in the second set of parameters. The base station 180 can receive, from the first UE 104 based on the first set of parameters 198, a first preamble of RACH in
a set of resources from RACH, O first preamble in RACH being associated with recovery failure beam and received from according to EU based at the second set in parameters, one second preamble in RACH no set in resources of RACH. The base station 180 can identify one
beam index for communication with the first UE 104 based on receipt of the first preamble to RACH. The first UE 1804 can be configured to receive, from base station 180, the first set of parameters 198 associated with the first RACH procedure, the first RACH procedure being associated with beam failure recovery with base station 180. The first UE 104 can receive, from base station 180, a second set of parameters associated with a second RACH procedure, the second RACH procedure is associated with one of initial access, cell selection, cell re-selection, loss of timing synchronization
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19/133 or handover. The first UE 104 can generate a RACH preamble based on the first set of parameters or based on the second set of parameters. The first UE 104 can send the generated RACH preamble to base station 180.
[0050] Figure 2A is a diagram 200 that illustrates an example of a DL subframe within a 5G / NR frame structure. Figure 2B is a diagram 230 illustrating an example of channels within a DL subframe. Figure 2C is a diagram 250 that illustrates an example of a UL subframe within a 5G / NR frame structure. Figure 2D is a diagram 280 that illustrates an example of channels within a UL subframe. The structure of the 5G / NR frame can be FDD in which, for a particular set of subcarriers (bandwidth of the carrier system), subframes within the set of subcarriers are dedicated to DL or UL, or they can be TDD in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated to both DL and UL. In the examples provided by Figures 2A, 2C, the structure of frame 5G / NR is assumed to be TDD, with subframe 4, a subframe DL and subframe 7, a subframe UL. Although subframe 4 is illustrated as providing only DL and subframe 7 illustrated as providing only UL, any particular subframe can be divided into different subsets that provide UL and DL. Note that the description above also applies to a 5G / NR frame structure that is FDD.
[0051] Other wireless communication technologies may have a different frame structure and / or different channels. One frame (10 ms) can be divided into 10
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20/133 subframes of equal size (1 ms). Each subframe can include one or more time partitions. Each partition can include 7 or 14 symbols, depending on the partition configuration. For partition configuration 0, each partition can include 14 symbols, and for partition configuration 1, each partition can include 7 symbols. The number of partitions within a subframe is based on the partition configuration and numerology. For partition configuration 0, different numerologies 0 to 5 allow 1, 2, 4, 8, 16 and 32 partitions, respectively, per subframe. For the configuration of partitions 1, different numerologies from 0 to 2 allow 2, 4 and 8 partitions, respectively, per subframe. Subcarrier spacing and symbol length / duration are a function of numerology. 2 ^Λ μ * 15 kKz, where μ is numerology 05. The length / duration of the symbol is inversely related to the subcarrier spacing. Figures 2A, 2C provide an example of configuration 1 of partitions with 7 symbols per partition and numerology 0 with 2 partitions per subframe. The subcarrier spacing is 15 kHz and the symbol duration is approximately 66.7 ps.
[0052] A resource grid can be used to represent the framework structure. Each time partition includes a resource block (RB) (also referred to as physical RBs (PRBs)) that span 12 consecutive subcarriers. The resource grid is divided into several resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
[0053] As illustrated in Figure 2A, some of the REs carry reference signals (pilot) (RS) to the UE
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21/133 (indicated as R). The RS can include demodulation RS (DMRS) and channel status information reference signals (CSI-RS) for channel estimation in the UE. The RS can also include beam measurement RS (BRS), beam refinement RS (BRRS) and phase tracking RS (PT-RS).
[0054] Figure 2B illustrates an example of several channels within a DL subframe of a frame. The physical control format indicator channel (PCFICH) is within the 0 symbol of partition 0 and carries a control format indicator (CFI) indicating whether the physical downlink control channel (PDCCH) occupies 1, 2 or 3 symbols (Figure 2B illustrates a PDCCH that occupies 3 symbols). The PDCCH carries downlink control information (DCI) within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in an OFDM symbol. A UE can be configured with an enhanced UE-specific PDCCH (ePDCCH) which also port DCI. The ePDCCH can have 2, 4 or 8 RB pairs (figure 2B shows two RB pairs, each subset including an RB pair). The physical hybrid auto-repeat request (HARQ) indicator channel (HARQ) (PHICH) is also within the symbol 0 and carries the HARQ (IH) indicator indicating HARQ confirmation return (ACK) negative confirmation (NACK) with based on the shared physical uplink channel (PUSCH). The primary synchronization channel (PSCH) can be within symbol 6 of partition 0 within subframes 0 and 5 of a frame. The PSCH carries a primary synchronization signal (PSS) that is used by a UE 104 to determine the subframe / symbol timing and an identity of
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22/133 physical layer. The secondary synchronization channel (SSCH) can be within the symbol 5 of partition 0 within subframes 0 and 5 of a frame. The SSCH carries a secondary synchronization signal (SSS) which is used by a UE to determine a physical layer cell identity and radio frame timing group number. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DL-RS. The physical transmission channel (PBCH), which carries a main information block (MIB), can be logically grouped with the PSCH and SSCH to form a synchronization signal (SS) / PBCH block. The MIB provides a number of RBs in the DL system bandwidth, a PHICH configuration and a number of system frames (SFN). The shared physical downlink channel (PDSCH) carries user data, transmission system information not transmitted through the PBCH, such as system information blocks (SIBs) and paging messages.
[0055] As illustrated in Figure 2C, some of the REs carry demodulation reference signals (DM-RS) for channel estimation at the base station. The UE can additionally transmit audible reference signals (SRS) at the last symbol of a subframe. The SRS can have a comb structure and a UE can transmit SRS on one of the combs. The SRS can be used by a base station to estimate channel quality to allow frequency-dependent programming on the UL.
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23/133 [0056] Figure 2D illustrates an example of several channels within a UL subframe of a frame. A physical random access channel (PRACH) can be within one or more subframes within a frame based on the PRACH configuration. The PRACH can include six consecutive RB pairs within a subframe. The PRACH allows the UE to perform initial access to the system and obtain UL synchronization. A physical uplink control channel (PUCCH) can be located at the edges of the UL system bandwidth. 0 PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a pre-coding matrix indicator (PMI), a rating indicator (RI) and ACK / return NACK of HARQ. The PUSCH carries data and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR) and / or UCI.
[0057] Figure 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In DL, EPC 160 IP packets can be provided to a 375 controller / processor. The 375 controller / processor implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control layer (RRC) and layer 2 includes a packet data convergence protocol layer (PDCP), a radiolink control layer (RLC) and a medium access control layer (MAC). The 375 controller / processor provides RRC layer functionality associated with the transmission of system information (for
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24/133 example, MIB, SIBs), RRC connection control (for example, RRC connection paging, RRC connection establishment, RRC connection modification and RRC connection release) inter-radio access technology (RAT) mobility and measurement configuration for the UE measurement report; PDCP layer functionality associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity checking) and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction by ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs in transport blocks (TBs), demultiplexing of MAC SDUs of TBs, scheduling information reporting, error correction by HARQ, priority handling and prioritization of logical channel.
[0058] The transmit processor (TX) 316 and the receive processor (RX) 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical layer (PHY), can include error detection in transport channels, encoding / decoding of direct error correction of transport channels, interleaving, rate matching, mapping in physical channels, modulation / demodulation of channels, and antenna processing
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25/133
ΜΙΜΟ. TX TX 316 processor handles mapping to signal constellations based on various modulation schemes (eg, binary phase shift switching (BPSK), quadrature phase shift switching (QPSK), M phase shift switching (M -PSK), M quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be divided into parallel streams. Each flow can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (eg pilot) in the time and / or frequency domain, then combined together using a Fast Inverse Fourier Transform (IFFT) to produce a channel which carries a stream of OFDM symbol in the time domain. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a 374 channel estimator can be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate can be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial flow can then be provided to a different antenna 320 via a separate transmitter 318TX. Each 318TX transmitter can modulate an RF carrier with a corresponding spatial flow for transmission.
[0059] In the UE 350, each 354RX receiver receives a signal through its respective antenna 352. Each 354RX receiver retrieves modulated information on an RF carrier and provides the information to the receiving (RX) 356 processor. The TX 368 processor and the RX 356 processor implement the
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26/133 layer 1 functionality associated with various signal processing functions. The RX 356 processor can perform spatial processing on the information to retrieve any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX 356 processor into a single OFDM symbol stream. The RX 356 processor then converts the flow of OFDM symbols from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate stream of OFDM symbols for each OFDM signal carrier. The symbols on each subcarrier and the reference signal are retrieved and demodulated to determine the most likely signal constellation points transmitted by the base station 310. These smooth decisions can be based on channel estimates calculated by the channel estimator 358. The smooth decisions they are then decoded and deinterleaved to retrieve the data and control signals that were originally transmitted by base station 310 on the physical channel. The data and control signals are then provided to the 359 controller / processor, which implements layer 3 and layer 2 functionality.
[0060] The controller / processor 359 can be associated with a 360 memory that stores program codes and data. 360 memory can be referred to as a computer-readable medium. In UL, the 359 controller / processor provides demultiplexing between transport and logical channels, reassembly of packets, decryption, decompression of headers and processing of control signals for
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27/133 retrieve IP packets from EPC 160. The 359 controller / processor is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.
[0061] Similar to the functionality described in connection with DL transmission by base station 310, the 359 controller / processor provides RRC layer functionality associated with the acquisition of system information (for example, MIB, SIBs), RRC connections and reporting measurement; PDCP layer functionality associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with the transfer of top layer PDUs, error correction through ARQ, concatenation, segmentation and reassembly of RLC SDRs, re-segmentation of RLC data PDUs and reorganization of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs in TBs, demultiplexing of MAC SDUs of TBs, scheduling information reports, correcting errors by HARQ, priority handling and prioritizing logical channels.
[0062] Channel estimates derived from a 358 channel estimator from a reference or feedback signal transmitted by base station 310 can be used by the TX 368 processor to select the appropriate coding and modulation schemes, and to facilitate spatial processing . The spatial streams generated by the TX 368 processor can be provided to different antennas 352 through separate 354TX transmitters. Each
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28/133 354TX transmitter can modulate an RF carrier with its respective spatial flow for transmission.
[0063] The UL transmission is processed at base station 310 in a similar manner to that described in connection with the receiving function on UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX retrieves modulated information on a carrier and provides the information for an RX 370 processor.
[0064] The controller / processor 375 can be associated with a memory 376 that stores program codes and data. Memory 376 can be referred to as a computer-readable medium. In UL, the 375 controller / processor provides multiplexing between transport and logic channels, packet reassembly, decryption, header decompression, control signal processing to retrieve IP packets from the UE 350. IP packets from the 375 controller / processor can be provided to EPC 160. The 375 controller / processor is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.
[0065] Figures 4A and 4B are diagrams that illustrate an example of the transmission of beam-formed signals between a base station (BS) and a UE. The base station can be incorporated as a base station in an mmW system (mmW base station). Referring to Figure 4A, diagram 400 illustrates a base station 404 of an mmW system transmitting beam signals 406 (for example, beam reference signals) in different transmission directions (for example, directions A, B, C and D). In one example, base station 404
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29/133 can scan the transmission directions according to an A-B-C-D sequence. In another example, base station 404 can scan transmission directions according to the sequence B-D-A-C. Although only four transmission directions and two transmission sequences are described in relation to Figure 4A, any number of different transmission directions and transmission sequences are contemplated.
[0066] After transmitting the signals, the base station 404 can switch to a reception mode. In reception mode, base station 404 can scan through different reception directions in a corresponding sequence or pattern (mapping) to a sequence or pattern, where base station 404 previously transmitted the sync / discovery signals in different directions transmission. For example, if base station 404 previously transmitted the sync / discovery signals in transmission directions according to the ABCD sequence, then base station 404 can scan through reception instructions according to the ABCD sequence, in an attempt to receive an association signal from a UE 402. In another example, if the base station 404 previously transmitted the synchronization / discovery signals in the transmission directions according to the BDAC sequence, then the base station 404 transmitted previously the synchronization / discovery signals in the transmission directions according to the BDAC sequence, then the base station 404 can scan the receiving directions according to the BDAC sequence in an attempt to receive the UE 402 association signal.
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30/133 [0067] A propagation delay in each signal formed by a beam allows a UE 402 to perform a reception scan (RX). The UE 402 in a receive mode can scan through different reception directions in an attempt to detect a synchronization / discovery signal 406 (see Figure 4B). One or more of the synchronization / discovery signals 406 can be detected by the UE 402. When a strong synchronization / discovery signal 406 is detected, the UE 402 can determine an ideal transmission direction of the base station 404 and an ideal reception direction of the UE 402 corresponding to the strong synchronization / discovery signal. For example, UE 402 can determine preliminary antenna weights / directions of strong sync / discovery signal 406 and can further determine a time and / or resource when base station 404 is expected to optimally receive a beam-formed signal. Thereafter, EU 402 may attempt to associate with base station 404 via beam signal.
[0068] Base station 404 can scan a plurality of directions using a plurality of ports in a cell-specific manner in a first symbol of a synchronization subframe. For example, base station 404 can scan through different transmission directions (for example, directions A, B, C and D) using four ports in a cell-specific manner in a first symbol of a synchronization subframe. In one aspect, these different transmission directions (for example, directions A, B, C and D) can be considered coarse beam directions. In one aspect, a beam reference signal (BRS) can be transmitted in different
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31/133 transmission (for example, directions A, B, C and D).
[0069] In one aspect, the base station 404 can scan the four different transmission directions (for example, directions A, B, C and D) in a specific cell way using four ports on a second symbol of a sync subframe . A synchronization beam can occur in a second symbol in the synchronization subframe.
[0070] Referring to diagram 420 of Figure 4B, UE 402 can listen for beam-shaped discovery signals in different reception directions (for example, E, F, G and H directions). In one example, the UE 402 can scan the receiving directions according to an E-F-GH sequence. In another example, the UE 402 can scan the receiving directions according to the sequence F-H-E-J. Although only four reception directions and two reception sequences are described in relation to Figure 4B, any number of different reception directions and reception sequences are contemplated.
[0071] UE 402 can attempt the association by transmitting signals formed by beam 426 (for example, association signals or another indication of a better coarse beam or a better thin beam) in the different transmission directions (for example, E, F directions , G, and H). In one aspect, UE 402 can transmit an association signal 426 by transmitting along the ideal receiving direction of UE 402 in time / resource, where base station 404 is expected to optimally receive the association signal. Base station 404 in receive mode can scan through different reception directions and detect the
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32/133 association 426 of UE 402 during one or more time partitions corresponding to a receiving direction. When a strong association signal 426 is detected, base station 404 can determine an ideal transmit direction of UE 402 and an ideal receive direction of base station 404 corresponding to the strong association signal. For example, base station 404 can determine preliminary antenna weights / directions of the strong association signal 426, and can further determine a time and / or resource at which UE 402 is expected to optimally receive a beam-formed signal. Any of the processes discussed above in relation to Figures 4A and 4B can be refined or repeated over time, such that the UE 402 and base station 404 end up learning the most ideal transmit and receive directions for establishing a connection each other. Such refinement and repetition can be referred to as beam training.
[0072] In one aspect, the base station 404 can choose a sequence or pattern to transmit the synchronization / discovery signals according to a number of beamforming directions. The base station 404 can then transmit the signals for a sufficiently long period of time for the UE 402 to scan a number of beamforming directions in an attempt to detect a synchronization / discovery signal. For example, a base station beam forming direction can be denoted by n, where n is an integer from 0 to N, where N is a maximum number of transmission directions. In addition, a beam forming direction of the UE can be denoted by k, where k is an integer from 0 to K, where K is a maximum number
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33/133 of reception directions. When UE 402 detects a sync / discovery signal from base station 404, UE 402 may discover that the strongest sync / discovery signal received when the beam forming direction of UE 402 for k = 2 and the direction of formation of the base station beam 404 is n = 3. Consequently, the UE 402 can use the same weights / directions of the antenna to respond (transmit a beam-formed signal) to the base station 404 in a corresponding response time partition. That is, UE 402 can send a signal to base station 404 using the k 402 beamforming direction during a time partition when base station 404 is expected to perform a receive scan in the n = 3 direction of the base station 404.
[0073] The loss of travel can be relatively high in millimeter wave (mmW) systems. Transmission can be directional to mitigate path loss. A base station can transmit one or more beam reference signals sweeping in all directions, so that a user equipment (UE) can identify a better coarse beam. In addition, the base station can transmit a beam refinement request signal so that the UE can track fine beams. If a coarse beam identified by the UE changes, the UE may need to inform the base station so that the base station can train one or more new thin beams for the UE.
[0074] In several respects, the UE can send an index of a better beam and corresponding request for a beam refinement reference signal session to the base station in a subframe reserved for RACH. The UE
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34/133 can occupy one or more shades reserved for RACH. In addition, the UE can occupy tones that are reserved for programming requests, but not for RACH transmission.
[0075] Figures 4C and 4D illustrate call flow diagrams of methods 430, 440 of RACH procedures. A UE 434 can perform a RACH procedure with a base station 432 (for example, an mmW base station, an eNB, etc.), for example, to synchronize with a network. A RACH procedure can be based on containment or based on non-containment.
[0076] Figure 4C illustrates a method 430 for a containment-based RACH procedure. First, UE 434 can select a RACH preamble for the RACH procedure. In addition, UE 434 can determine a random access RNTI (RA) to identify UE 434 during the RACH procedure. The UE 434 can determine an RA-RNTI based, for example, on a time partition number on which an MSG1 436 is sent. UE 434 can include the preamble to RACH and RA-RNTI in MSG1 436.
[0077] In one aspect, the UE 434 can determine at least one resource (for example, a time and / or frequency resource) which is to carry the MSG1 436. For example, the base station 432 can transmit system information ( for example, a SIB), and the UE 434 can acquire at least one resource based on system information (for example, system information included in a SIB2). UE 434 can send MSG1 436 to base station 432, for example, on at least one resource. If the UE 434 does not receive a response
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35/133 to MSG1 436 (for example, after a timer has expired), then the UE 434 can increase transmission power (for example, at a fixed interval) and resend MSG1 436.
[0078] Based on MSG1 436, base station 432 can send an MSG2 437 to UE 434. The MSG2 437 can also be known as a random access response and can be sent on a shared downlink channel (DLSCH). Base station 432 can determine a temporary cell RNTI (T-CRNTI). In addition, base station 432 can determine a timing advance value so that UE 434 can adjust the timing to compensate for the delay. In addition, base station 432 can determine an uplink resource lease, which can include an initial resource assignment to UE 434, so that UE 434 can use the shared uplink channel (UL-SCH). Base station 432 can generate MSG2 437 to include the C-RNTI, the timing advance value and / or the uplink lease feature. Base station 432 can then transmit MSG2 437 to UE 434. In one aspect, EU 434 can determine an uplink resource lease based on MSG2 437.
[0079] Based on MSG2 437, the UE 434 can send an MSG3 438 to base station 432. The MSG3 438 can also be known as an RRC connection request message and / or a programmed transmission message. The UE 434 can determine a temporary mobile subscriber identity (TMSI) associated with the UE 434 or another random value used to identify the UE 434 (for example, if the UE 434 is connected to the network for the first time). 0 EU 434
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36/133 can determine a connection establishment clause, which can indicate why the UE 434 is connecting to the network. UE 434 can generate MSG3 438 to include at least TMSI or another random value, as well as the connection establishment clause. The UE 434 can then transmit the MSG3 438 to the base station on the UL-SCH.
[0080] Based on MSG3 438, base station 432 can send an MSG4 439 to UE 434. 0 MSG4 439 can also be known as a connection resolution message. Base station 432 can direct MSG4 439 to TMSI or random value from MSG3 438. MSG4 439 can be mixed with a C-RNTI associated with UE 434. Base station 432 can transmit MSG4 439 to UE 434. 0 UE 434 can decode MSG4 439, for example, using the C-RNTI associated with UE 434. This RACH procedure can allow UE 434 to be synchronized with a network.
[0081] Figure 4D illustrates a 440 method of a RACH procedure based on non-containment. The non-contention RACH procedure may be applicable to the handover and / or downlink data arrival.
[0082] Base station 432 can determine a random access preamble assigned to UE 434. Base station 432 can transmit, to UE 434, the assignment of random access preamble 442. 0 UE 434 can respond to the assignment of access preamble random 442 with random access preamble 444 (for example, an RRC connection message), which can be the random access preamble assigned to UE 434. The UE 434 can then receive, from base station 432, a random access response 446 (e.g.,
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37/133 an uplink concession).
[0083] Figures 5A to 5G are diagrams that illustrate an example of the transmission of beam-formed signals between a base station and a UE. Base station 504 can be incorporated as a base station in an mmW system (mmW base station). It should be noted that while some beams are illustrated as adjacent to each other, such an arrangement may be different in different aspects (for example, beams transmitted during the same symbol may not be adjacent to each other).
[0084] In one aspect, a beam can contain eight different beams. For example, Figure 5A illustrates eight bundles 521, 522, 523, 524, 525, 526, 527, 528 for eight directions. In aspects, the base station 504 can be configured to form a beam for transmitting at least one of the beams 521, 522, 523, 524, 525, 526, 527, 528 towards the UE 502. In one aspect, the base station 504 can scan / transmit 112 directions using eight ports during the synchronization subframe.
[0085] In one aspect, a base station can transmit a beam reference signal (BRS) in a plurality of directions during a synchronization subframe. In one aspect, this transmission can be cell specific. Referring to Figure 5B, base station 504 can transmit a first set of beams 521, 523, 525, 527 in four directions. For example, base station 504 can transmit a BRS in a synchronization subframe of each of the transmission beams 521, 523, 525, 527. In one aspect, these beams 521, 523, 525, 527
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38/133 transmitted in the four directions can be odd indexed beams 521, 523, 525, 527 for the four directions out of a possible eight for the beam set. For example, base station 504 may be able to transmit beams 521,
523, 525, 527 in directions adjacent to other bundles 522,
524, 526, 528 that base station 504 is configured to transmit. In one aspect, this configuration in which the base station 504 transmits beams 521, 523, 525, 527 to the four directions can be considered a coarse beam set.
[0086] In Figure 5C, UE 502 can determine or select a beam index that is stronger or preferable. For example, UE 502 may determine that beam 525 carrying a BRS is stronger or preferable. The UE 502 can select a beam based on the measurement of values for a received power or received quality associated with each of the first sets of beams 521, 523, 525, 527, comparing the respective values with each other and selecting the beam that corresponds to the highest value . The selected beam can correspond to a beam index at base station 504. UE 502 can transmit an indication 560 of this beam index to base station 504. In one aspect, indication 560 can include a request to transmit a reference signal beam refinement (BRRS). BRRS can be specific to the UE. Someone skilled in the art would appreciate that BRRS can be referred to by different terminology without departing from the present disclosure, such as a beam refinement signal, a beam tracking signal, or another term.
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39/133 [0087] In several respects, the UE 502 can determine a resource that corresponds to the selected beam index. An asset can include a radio frame, a subframe, a symbol or a subcarrier region. Each resource can correspond to a value, for example, a radio frame index, a subframe index, a symbol index or a subcarrier region. In one aspect, the UE 502 may have stored it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds . For example, the UE 502 can determine the beam index and then access a lookup table to determine a feature index or region that matches the given beam index.
[0088] In one aspect, the resource can be included in the PUCCH. In one aspect, at least one resource can be included in the subframe associated with a random access channel (RACH). For example, the resource can be included in a bandwidth reserved for RACH transmission. In another example, at least one resource is included in an unreserved bandwidth for RACH transmission. According to another example, the bandwidth is reserved for transmission of the programming request.
[0089] Base station 504 can receive indication 560, which can include a beam adjustment request (for example, a beam tracking request, a BRRS request, a request for the base station to start transmitting at an ID beam indicated without any
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40/133 additional and similar beam tracking). Based on indication 560, base station 504 can determine the index corresponding to the selected beam 525. That is, indication 560 can be carried on a resource determined to correspond to the index of the selected beam 525. In one aspect, the base station 504 it can be stored in it or it can have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. For example, base station 504 can determine the resource on which indication 560 is received and then access a lookup table to determine a beam index (for example, the index corresponding to the selected beam 525) or region that corresponds to the determined beam.
[0090] In Figure 5D, base station 504 can transmit a second set of beams based on the index included in indication 560. For example, UE 502 can indicate that a first beam 525 is stronger or preferable and, in response, base station 504 can transmit a second set of beams 524, 525, 526 to UE 502 based on the indicated beam index. In one aspect, beams 524, 525, 526 transmitted based on the indicated beam index may be closer (for example, spatially and / or directionally) to the selected beam 525 than those other beams 521, 523, 527 of the first set bundles. In one aspect, beams 524, 525, 526 transmitted based on the indicated beam index can be considered as a thin beam array. In one aspect, a BRRS can be transmitted in each of the beams 524, 525, 526 of the set
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41/133 thin beam. In one aspect, the bundles 524, 525, 526 of the thin bundle may be adjacent.
[0091] Based on one or more BRRS received on beams 524, 525, 526 of the thin beam array, UE 502 can transmit a second indication 565 to base station 504 to indicate a better thin beam. In one aspect, the second indication 565 can use two (2) bits to indicate the selected beam. For example, UE 502 can transmit an indication 565 indicating an index corresponding to the selected beam 525. Base station 504 can then transmit to UE 502 using the selected beam 525.
[0092] Referring to Figure 5E, base station 504 can transmit a BRS in a plurality of directions during a synchronization subframe. In one aspect, base station 504 can transmit BRS continuously, for example, even after UE 502 has communicated indication 565 of a selected beam 525. For example, base station 504 can transmit beams 521, 523, 525, 527 that each includes a BRS (for example, a set of coarse bundles).
[0093] Referring to Figure 5F, the quality of the selected beam 525 may deteriorate so that the UE 502 no longer prefers to communicate using the selected beam 525. Based on the BRS transmitted in synchronization subframes (for example, transmitted continuously), the UE 502 can determine a new beam 523 in which to communicate. For example, UE 502 may determine that beam 523 carrying a BRS is stronger or preferable. The UE 502 can select a beam based on measurement values for received power or associated received quality
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42/133 to each of the bundle sets 521, 523, 525, 527, comparing the respective values to each other and selecting the bundle that corresponds to the highest value. The selected beam can correspond to a beam index at base station 504. UE 502 can transmit a request 570 indicating this beam index to base station 504. In one aspect, indication 560 can include a request to transmit a signal from beam refinement reference (BRRS). BRRS can be specific to the UE.
[0094] In several respects, the UE 502 can determine a resource that corresponds to the selected beam index. An asset can include a radio frame, a subframe, a symbol or a subcarrier region. Each resource can correspond to a value, for example, a radio frame index, a subframe index, a symbol index or a subcarrier region. In one aspect, a beam adjustment request (BAR) can be used to request base station 504 to transmit a BRRS.
[0095] In one aspect, the UE 502 may have stored it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the index beam corresponds. For example, the UE 502 can determine the beam index and then access a lookup table to determine a feature index or region that corresponds to the determined beam index.
[0096] In one aspect, at least one resource can be included in a physical uplink control channel
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43/133 (PUCCH). However, base station 504 may only be able to detect signals from UE 502 on the first indicated beam 525 (Figure 5C). Thus, UE 502 can request a link budget at PUCCH to indicate request 570 using PUCCH.
[0097] In another aspect, at least one resource is included in a subframe associated with a RACH. In one respect, at least one resource is included in a bandwidth reserved for RACH transmission. In one aspect, at least one resource can be included in a bandwidth not reserved for RACH transmission. In one aspect, at least one resource can be included in a bandwidth reserved for transmission of schedule request (SR), which can be in a RACH subframe, but may not be reserved for RACH transmission.
[0098] With reference to Figure 5G, base station 504 can receive request 570 from UE 502. Base station 504 can be configured to determine a beam index of the beam array (for example, the beam array illustrated in Figure 5E) based on at least one of the request and / or the at least one resource. For example, request 750 can be carried on a given resource to match the selected beam index 523. In one aspect, base station 504 may have it stored on it or may have access to a mapping or table (for example, a table of query) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. For example, base station 504 can determine the resource on which request 570 is received and then access a lookup table to determine a
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44/133 beam index (for example, the index corresponding to the selected beam 523) or region that corresponds to the determined beam index. In one aspect, an uplink receiving beam upon receipt of request 570 can be based on the first set of beams 521, 523, 525, 527.
[0099] In one aspect, the base station 504 can be configured to transmit a second set of beams 522, 523, 524 based on at least one request 570 and / or at least one resource on which request 570 is made. In one aspect, base station 504 can be configured to determine, from request 570 and / or at least one resource that carries request 570, an index range. In one aspect, the base station 504 determines the beam index based on at least one subcarrier of the at least one resource on which the request 570 is carried.
[00100] In one aspect, the base station 504 determines, within the range, the beam index based on the strength of a signal in different reception chains of the base station 504, through which the request 570 is received. For example, base station 504 can receive request 570 through a plurality of reception strings from base station 504. Base station 504 can determine a signal strength of request 570 for each receive chain through which request 570 is received. Base station 504 can determine that each receiving chain is associated with at least one beam index (for example, the beam index for beam 523) and thus base station 504 can determine the beam index that
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45/133 corresponds to the reception chain in which the highest signal strength of request 570 is detected.
[00101] In one aspect, the base station 504 can transmit to the UE 502 an instruction to perform beam refinement based on request 570. In one aspect, the instruction to perform beam refinement can be based on the selected beam 523 indicated for base station 504 by UE 502. In one aspect, base station 504 can transmit one or more BRRS in one or more synchronization subframes of the second set of beams 522, 523, 524. The UE 502 can measure BRRS in the subframe (s) programmed to determine the best beam from base station 504, such as measuring a respective value for received power and / or received quality of each beam of the second set of beams 522, 523, 524, and comparing the measured values each other to determine the highest values corresponding to a beam of the second set of beams 522, 523, 524.
[00102] With reference to Figure 6, a block diagram to indicate a selected beam is illustrated. In aspects, the base station 504 can transmit a set of AH 521, 523, 525, 527, 529, 531, 533, 535 beams. In aspects, the UE 502 may need to indicate a newly selected beam from the AH 521, 523 beams , 525, 527, 529, 531, 533, 535 for base station 504, for example, when a first selected beam deteriorates. However, as the base station 504 may only be able to detect the transmission of the UE 502 in the direction of the first selected beam, the UE 502 can use a RACH 600 subframe to identify a new beam (for example, because the
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46/133 beam formation may not be necessary for RACH in a cell).
[00103] In one aspect, at least one of the base station 504 and / or UE 502 maintains a mapping between beams (for example, AH beams 521, 523, 525, 527, 529, 531, 533, 535) associated with a session synchronization (or BRS) and RACH session. That is, UE 502 can be configured to indicate a beam index using one or more resources from a RACH 600 subframe, such as transmitting a request (for example, request 570) on at least one resource corresponding to the beam index selected by UE 502.
[00104] For example, UE 502 can be configured to transmit request 570 as a RACH sequence in a symbol 0 and 1 of the RACH 600 subframe if the selected beam index (for example, beam 523) corresponds to a beams AD 521, 523, 525, 527. Likewise, UE 502 can be configured to transmit request 570 as a RACH sequence in a symbol 2 and 3 of the RACH 600 subframe, if the selected beam index matches to one of the bundles EH 529, 531 533, 535.
[00105] In one aspect, UE 502 can indicate a specific beam within the range using at least one subcarrier. For example, UE 502 may indicate a beam within the beam range AD 521, 523, 525, 527 using at least one of a pair of subcarriers 620, 622, 624, 626. Similarly, UE 502 may indicate a beam within the beam range EH 529, 531, 533, 535 using at least one of a pair of subcarriers 620, 622, 624, 626. For example, subcarriers 620 may
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47/133 indicate a first beam of an interval and, therefore, when the UE 502 transmits a RACH sequence in the symbols 0 and 1 and subcarriers 620, the UE 502 indicates a selected beam A 521. Through another example, the UE 502 can indicate a selected beam G 533 when transmitting a RACH sequence on subcarriers 624 (corresponding to a third beam within a range) at symbols 2 and 3. Base station 504 can therefore determine a selected beam index based on the hair least one resource over which the RACH sequence is transmitted.
[00106] In another aspect, the base station 504 determines, from within the range, the beam index based on a signal strength in different reception chains of the base station 504 through which the request 570 is received. For example, base station 504 can receive request 570 through a plurality of reception strings from base station 504. Base station 504 can determine a signal strength of request 570 for each receive chain through which request 570 is received. Base station 504 can determine that each receiving chain is associated with at least one beam index (for example, the beam index for beam 523) and thus base station 504 can determine the beam index that corresponds to the beam chain. reception in which the highest signal strength of request 570 is detected. For example, the UE 502 can select beam E 529 as the newly selected beam. To indicate the selected E 529 beam, the UE 502 can transmit a RACH sequence in symbols 2 and 3 of the RACH subframe. The base station 504
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48/133 can receive the RACH sequence through one or more reception chains from the base station 504. The base station 504 can determine the signal strengths of the RACH sequence for each reception chain from the base station 504. The base station 504 can determine the selected beam E 529 because the highest signal strength of the RACH sequence can occur in the receiving chain corresponding to a third beam of an interval (and the interval can be indicated by symbols 2 and 3).
[00107] The indication of the selected beam index using a RACH subframe can suffer several limitations. For example, UE 502 may not be synchronized with base station 504 when transmitting a RACH sequence. A cyclic prefix in a RACH sequence can be greater than the sum of the round trip time (RTT) and the spread delay (for example, in regular transmission, a cyclic prefix may need to be greater than a delay interval). Thus, the number of cyclical shifts available to UEs may be low. For example, the available number of cyclic offsets can be less than or equal to a sequence duration and / or cyclic prefix duration. Therefore, the number of degrees of freedom in the reserved RACH region of a RACH 600 subframe may be low. In addition, there may be a collision if many UEs transmit a beam adjustment request in the RACH 600 subframe. In addition, the RACH structure may include an additional overhead (for example, base station 504 sends a RACH response and allocates a lease. for the EU to transmit additional information).
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49/133 [00108] Therefore, the UE 502 can transmit a beam adjustment request (for example, a BRRS request) in an unoccupied bandwidth of a RACH subframe. This region may not be reserved for RACH transmission. In one aspect, this region can be reserved for scheduling request (SR) transmission.
[00109] In one aspect, the base station 504 can be configured to determine a beam index based on a cyclic offset. For example, base station 504 can send information to the UE 502 indicating one or more cyclic offset values. Each of the cyclic displacement values can be associated with a respective beam index. In one aspect, the base station 504 can transmit the information indicating one or more cyclic displacement values to the UE 502 using one or more of a physical broadcast channel (PBCH), minimum remaining system information (RMSI), other information of system (OSI), an RRC message or a handover message. In one aspect, base station 504 can configure UE 502 with at least one cyclic offset corresponding to a beam index across a region 710 that is not reserved for RACH and / or base station 504 can configure UE 502 with at least minus a cyclic shift corresponding to a beam index through a region reserved for RACH (for example, RACH 712 transmission region). In one aspect, the base station 504 can display information for the UE 502 indicating that a first cyclic shift (associated with a first beam index) is associated with RACH free from
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50/133 contention and information indicating that a second cyclical displacement (associated with a second beam index) is associated with contention-based RACH. In several respects, base station 504 may indicate, for UE 502, that UE 502 should use a first cyclical displacement value (associated with a first beam index) when UE 502 is time-synchronized with base station 504, and indicating, for the UE 502, that the UE 502 should use a second cyclical displacement value (associated with a second beam index) when the UE 502 is not time-synchronized with the base station 504.
[00110] The UE 502 can receive the information indicating the one or more cyclical displacements, which can each be associated with a respective beam index. As described above, UE 502 can identify or select a better beam corresponding to a beam index. The UE 502 can then identify the cyclical displacement corresponding to that beam index of the best beam. For example, the UE 502 can identify or select a new beam when a current service beam and / or control beam (s) fails. The UE 502 can then transmit a BAR through the identified cyclical displacement. In one aspect, the BAR can be a request for a BRRS, whose cyclical displacement indicates the thin beam selected for a beam refinement procedure.
[00111] The base station 504 can receive the BAR through the cyclical displacement applied by EU 502 for the transmission of BAR. Base station 504 can identify the cyclical displacement through which the BAR is received. THE
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51/133 from the cyclic offset, the base station 504 can identify the beam index corresponding to that cyclic offset. The base station 504 can then use the beam corresponding to the beam index identified as a service beam and / or the base station 504 can transmit a BRRS through that beam corresponding to the identified beam index. For example, base station 504 can change the current service beam to the beam corresponding to the identified beam index, for example, when the current service beam and / or the control beam (s) fail.
[00112] With reference to Figure 7, a block diagram to indicate a selected beam is illustrated. In aspects, the base station 504 can transmit a set of AH 521, 523, 525, 527, 529, 531, 533, 535 beams. In aspects, the UE 502 may need to indicate a newly selected beam from the AH 521, 523 beams , 525, 527, 529, 531, 533, 535 for base station 504, for example, when a first selected beam deteriorates. However, as the base station 504 may only be able to detect the transmission of the UE 502 in the direction of the first selected beam, the UE 502 may use a subframe of RACH 700 to identify a new beam.
[00113] In aspects, the UE 502 can use a region 710 that may not be reserved for RACH transmission. In one aspect, this region 710 can be reserved for RS transmission (for example, region 710 can be used to collect the buffer status report). In one aspect, a BAR procedure can be configured on the UE 502. For example, if a dedicated SR for BRRS request is
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52/133 configured for UE 502, a PHY layer of UE 502 can signal a dedicated SR for BRRS request in the region
SR 710 of the subframe of RACH 700. [00114] On one aspect, the UE 502 can only broadcast in the region 710, when the EU 502 is aligned temporally with the base station 504. 0 number of
available cyclical shifts associated with region 710 may be greater than those available in region 712 reserved for RACH transmission. Consequently, there may be a greater degree of freedom associated with region 710 compared to region 712. For example, a plurality of UEs may be able to transmit requests (for example, beam tracking and / or BRRS requests) across the region 710 (for example, more UEs than capable of transmitting requests via the RACH 712 transmission region).
[00115] In one aspect, the UE 502 can select a transmission time for SR based on the symbol index of the strongest beam (for example, a beam in which a stronger BRS is received during a synchronization subframe). In one aspect, the UE 502 can transmit an SR during a subframe of RACH 700, if instructed by an upper layer. For example, a PHY layer of UE 502 can be provided with a plurality of parameters, including a band number Nsr, cyclic shift V, a root u, a parameter f, a number of system frames (SFN), a period of BRS Nbrs transmission, a number of Nrach symbols during the RACH 700 subframe to which base station 504 can apply different beams (for example, different beams of
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53/133 reception), a number of RACH subframes M in each radio frame, a current RACH subframe index m, a symbol with the strongest sync ^beam $ sync ^Beam · & root u can be cell specific. The UE 502 can calculate a symbol index 1 based on SFN, Nbrs, Nrach, M, m, and
Ssync ^Beam · ^For example [00116]
Where Nrep can denote number of symbols dedicated to a single RACH transmission (for example, Nrep = 2).
[00117]
In one aspect at least one of the base station 504 and / or UE 502 maintains a mapping between beams (for example, AH beams 521, 523, 525, 527, 529, 531, 533, 535) associated with a synchronization session (or BRS) and region 710. That is, UE 502 can be configured to indicate a beam index using one or more resources from a RACH 700 subframe, such as transmitting a request (for example, request 570) in at least one resource corresponding to the beam index selected by the UE 502.
[00118] For example the UE
502 can be configured to transmit request 570 in a symbol 0 and 1 of the RACH subframe 70 0 if the selected beam index (for example, beam 523) corresponds to one of the AD 521, 523, 525, 527 beams. Similarly, UE 502 can be configured to transmit request 570 over a
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54/133 symbol 2 and 3 of the RACH 700 subframe, if the selected beam index corresponds to one of the E-H 529, 531, 533, 535 beams.
[00119] In one aspect, UE 502 can indicate a specific beam within the range using at least one subcarrier. For example, UE 502 can indicate a beam within the beam range AD 521, 523, 525, 527 using at least one of a pair of subcarriers 720, 722, 724, 726. Similarly, UE 502 can indicate a beam within beam range EH 529, 531, 533, 535 using at least one of a pair of subcarriers 720, 722, 724, 726. For example, subcarriers 720 can indicate a first beam of a range and therefore when the UE 502 transmits a request to symbols 0 and 1 and to subcarriers 720, UE 502 indicates a selected beam A 521. By another example, UE 502 can indicate a selected beam G 533 when transmitting a request to subcarriers 724 (corresponding to a third beam within a range) in symbols 2 and 3. Base station 504 can therefore determine a selected beam index based on at least one resource on which the foot request is transmitted.
[00120] In another aspect, the base station 504 determines, from within the range, the beam index based on a signal strength in different reception chains of the base station 504 through which the request 570 is received. For example, base station 504 can receive request 570 through a plurality of reception strings from base station 504. Base station 504 can determine a signal strength of request 570 to
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55/133 each receiving chain through which request 570 is received. Base station 504 can determine that each receiving chain is associated with at least one beam index (for example, the beam index for beam 523), and so base station 504 can determine the beam index that corresponds to the chain in which the highest signal strength of request 570 is detected. For example, the UE 502 can select beam E 529 as the newly selected beam. To indicate the selected E 529 beam, the UE 502 can transmit a request on symbols 2 and 3 of the RACH subframe. Base station 504 can receive the request via one or more reception chains from base station 504. Base station 504 can determine the signal strengths of the request for each reception chain from base station 504. Base station 504 can determine the selected beam E 529 because the highest signal strength of the request can occur in the receiving chain corresponding to a third beam of an interval (and the interval can be indicated by symbols 2 and 3).
[00121] Figure 8 is a flow chart 800 of a wireless communication method. The method can be performed by a UE (for example, the UE 502). Someone with common skill would understand that one or more operations can be omitted, transposed and performed at the same time.
[00122] In 802 operation, the UE can detect a set of beams from a base station, for example, detecting a BRS transmitted in a synchronization subframe of each beam of the first set of beams.
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In the context of Figure 5E, UE 502 can detect the first set of beams 521, 523, 525, 527, such as detecting a BRS transmitted in a synchronization subframe of each beam 521, 523, 525, 527. The first set of bundles can be odd indexed bundles.
[00123] In operation 804, the UE can select a beam from the beam set. For example, the UE may determine that the beam carrying a BRS is stronger or preferable. The UE can select a beam based on the measurement of values for a received power or received quality associated with each of the first sets of beams, compare the respective values with each other and select the beam that corresponds to the highest value. The selected beam can correspond to a beam index on the base station. In the context of Figure 5F, UE 502 can select beam 523.
[00124] In operation 80 6, the UE can determine at least one resource based on the selected beam. In the context of Figure 5F, UE 502 can determine at least one resource based on the selected beam 523. In the context of Figure 6, UE 502 can determine symbols 0 and 1 and / or subcarriers 622. In the context of Figure 7, the UE 502 can determine symbols 0 and 1 and / or subcarriers 722 of region 710.
[00125] In one aspect, the at least one resource indicates at least one of a radio frame index, a subframe index, a symbol index or a subcarrier region. In one respect, at least one resource is included in a PUCCH. In one respect, at least one resource is included in a subframe associated with RACH. In one respect,
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57/133 the at least one resource is included in a bandwidth associated with RACH. In one aspect, at least one resource is included in a bandwidth not reserved for RACH transmission, such as a bandwidth reserved for SR transmission. In one aspect, the UE may have stored it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. For example, the UE can determine the beam index and then access a lookup table to determine a resource index or region that matches the given beam index.
[00126] In operation 808, the UE can transmit, at least one determined resource, a beam adjustment request (for example, a BRRS request) to the base station. The request can indicate the index associated with the selected beam. In the context of Figure 5F, UE 502 can transmit request 570.
[00127] In operation 810, the UE can receive an instruction to perform beam refinement (for example, a BRRS) based on the request. In the context of Figure 5G, UE 502 can receive, from base station 504, an instruction to perform beam refinement based on request 570.
[00128] In operation 812, the UE can perform beam refinement based on the instruction. The UE can perform beam refinement based on the selected beam. In the context of Figure 5G, the UE 502 can perform beam refinement based on an instruction from the station
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58/133 base 504.
[00129] In one aspect, operation 812 can include operations 814 and 816. In operation 814, the UE can receive the selected beam from the base station. In one aspect, the selected beam is included in a first set of beams from the base station. In the context of Figure 5G, UE 502 can receive beam array 522, 523, 524.
[00130] In operation 816, the UE can determine a better receiving beam from the UE that corresponds to the selected beam received from the base station. In the context of Figure 5G, the UE 502 can receive a better receiving beam from the UE 502 for a beam within the beam array 522, 523, 524 for example, the UE 502 can determine a better receiving beam for the beam 523.
[00131] Figure 9 is a flow chart 900 of a wireless communication method. The method can be carried out by a base station (for example, the base station 504). A person skilled in the art would understand that one or more operations can be omitted, transposed and performed at the same time.
[00132] In operation 902, the base station can transmit a first set of beams, such as transmitting a BRS a synchronization subframe of each beam of the first set of beams. The first set of bundles can be bundles with odd indices. In the context of Figure 5E, base station 504 can transmit the first set of beams 521, 523, 525, 527.
[00133] In operation 904, the base station can receive a beam adjustment request in at least one
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59/133 appeal.
In the context of Figure 5F, base station 504 can receive request 570 from UE 502.
[00134] In operation 906, the base station can determine a beam index of a beam in the first set of beams based on the request and / or at least one resource that carries the request. In one aspect, the base station may have stored it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. . For example, the base station can determine the resource on which the request is received and access a lookup table to determine a beam index (for example, the index corresponding to the selected beam) or the region that corresponds to the determined beam index.
[00135] In the context of Figure 5F, base station 504 can determine at least one resource based on request 570 and at least one resource carrying request 570, for example, when UE 502 indicates the selected beam 523. In the context of Figure 6, base station 504 can detect request 570 on symbols 0 and 1 and / or subcarriers 622, which can indicate the selected beam 523. In the context of Figure 7, base station 504 can detect request 570 on symbols 0 and 1 and / or subcarriers 722 of region 710, which can indicate the selected beam 523.
[00136] In one aspect, at least one resource is included in a PUCCH. In one respect, at least one resource is included in a subframe associated with RACH. In one respect,
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60/133 the at least one resource is included in a bandwidth associated with RACH. In one aspect, the at least one resource is included in a bandwidth not reserved for RACH transmission, such as a bandwidth reserved for SR transmission.
[00137] In one aspect, operation 906 can include operations 920 and 922. In operation 920, the base station can determine an index range based on at least one resource. In the context of Figure 5F, base station 504 can determine an index range based on at least one resource carrying request 570. In the context of Figure 6, base station 504 can determine symbols 0 and 1 to indicate a series of beam indices. In the context of Figure 7, base station 504 can determine symbols 0 and 1 to indicate a range of beam indices.
[00138] In operation 922, the base station can determine the beam index based on at least one subcarrier that carries the request or a reception chain from the base station through which the request is received. In the context of Figure 6, base station 504 can assign subcarriers 622 to indicate a beam index within the range of beam indices. In the context of Figure 7, base station 504 can assign subcarriers 722 to indicate a beam index within the beam index range. Alternatively, base station 504 may determine a beam index based on a receiving chain from base station 504, through which the request is received.
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61/133 [00139] In operation 908, the base station can transmit a second set of beams based on the beam index. The second set of bundles may be thin bundles. In the context of Figure 5G, base station 504 can transmit the second set of beams 522, 523, 524. In one aspect, base station 504 can receive another beam index based on the second set of beams, such as two (2) bits of UE 502.
[00140] Figure 10 is a conceptual data flow diagram 1000 that illustrates the data flow between different media / components in an exemplary apparatus 1002. The apparatus may be a UE. Apparatus 1002 includes a receiving component 1004 that can be configured to receive signals from an mmW base station (e.g., base station 1050). Apparatus 1002 may include a transmission component 1010 configured to transmit signals to an mmW base station (e.g., base station 1050).
[00141] The apparatus 1002 may include a beam detection component 1012 configured to detect one or more beams transmitted by a mmW 1050 base station. In one aspect, the beam detection component 1012 may be configured to detect one or more BRS transmitted in a coarse set of beams by the base station mmW 1050. The beam detection component 1012 can monitor one or more synchronization subframes and detect one or more BRS transmitted by the base station mmW 504.
[00142] The beam selection component 1014
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62/133 can be configured to select a beam based on the BRSs detected by the beam detection component 1012. For example, the beam selection component 1014 can be configured to measure received power or received quality from one or more BRSs and select the beam corresponding to the highest power received or quality received. The beam selection component 1014 can provide an indication of that selected beam for a feature determination component 1016.
[00143] The selected beam can correspond to an index. The resource determination component 1016 can be configured to determine the resource that must carry a beam adjustment request (for example, a BRRS request) to indicate the selected beam. For example, a resource can include a radio frame, a subframe, a symbol or a subcarrier region. Each resource can correspond to a value, for example, a radio frame index, a subframe index, a symbol index or a subcarrier region. In one aspect, the resource determination component 1016 may have stored in it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. For example, the resource determination component 1016 can determine the beam index and then access a lookup table to determine a resource index or region that corresponds to the determined beam index.
[00144] In one aspect, the resource is included in the
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63/133 subframe associated with a RACH. In one respect, the resource is included in a bandwidth reserved for RACH transmission. In one respect, the resource is included in a bandwidth not reserved for RACH transmission. In one respect, bandwidth is reserved for scheduling request transmission. In one respect, the feature is included in a PUCCH.
[00145] The resource determination component 1016 can provide an indication of the resource determined to a transmission component 1010. The transmission component 1010 can be configured to transmit a beam adjustment request to the base station mmW 1050 on the determined resource in order indicate an index associated with the selected beam. The beam adjustment request can include a request for a BRRS.
[00146] In one aspect, the beam detection component 1012 can receive, from the mmWW base station 1050, an instruction to carry out beam refinement on a receiver (for example, the receiving component 1004) of the apparatus 1002. The component of beam detection 1012 can perform beam refinement based on the request.
[00147] The apparatus may include additional components that execute each of the algorithm blocks in the aforementioned flowcharts of Figure 8. As such, each block in the aforementioned flowcharts of Figure 8 may be made by a component and the apparatus may include one or more of these components. The components can be one or more hardware components specifically configured to execute the declared processes / algorithms, implemented
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64/133 by a processor configured to execute the established processes / algorithm, stored in a computer-readable medium for implementation by a processor or some combination thereof.
[00148] Figure 11 is a diagram 1100 that illustrates an example of a hardware implementation for a device 1002 'employing a processing system 1114. The processing system 1114 can be implemented with a bus architecture, generally represented by the 1124 bus. The 1124 bus can include any number of bus and bridge interconnection, depending on the specific application of the 1114 processing system and the general design restrictions. The bus 1124 joins several circuits, including one or more processors and / or hardware components, represented by the processor 1104, the components 1004, 1010, 1012, 1014, 1016 and the computer-readable medium / memory 1106. The bus 1124 can also interconnect several other circuits, such as timing sources, peripherals, voltage regulators and power management circuits, which are well known in the art and, therefore, will not be described.
[00149] The processing system 1114 can be coupled to a transceiver 1110. Transceiver 1110 is coupled to one or more antennas 1120. Transceiver 1110 provides a means of communicating with various other devices via a transmission medium. Transceiver 1110 receives a signal from one or more antennas 1120, extracts information from the received signal and provides the extracted information to the processing system 1114, specifically the receiving component 1004. In addition
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65/133 In addition, transceiver 1110 receives information from processing system 1114, specifically the transmission component 1010, and based on the information received, generates a signal to be applied to one or more antennas 1120. Processing system 1114 includes a processor 1104 coupled to a computer-readable medium / memory 1106. Processor 1104 is responsible for general processing, including running software stored in computer-readable medium / memory 1106. The software, when run by processor 1104, makes the system 1114 processors perform the various functions described above for any device. Computer-readable medium / memory 1106 can also be used to store data that is handled by processor 1104 when running the software. The processing system 1114 further includes at least one of the components 1004, 1010, 1012, 1014, 1016. The components may be software components running on processor 1104, resident / stored in the computer-readable medium / memory 1106, one or more hardware components attached to the 1104 processor, or some combination thereof. The processing system 1114 can be a component of the UE 350 and can include the 360 memory and / or at least one of the TX 368 processor, the RX 356 processor and the 359 controller / processor.
[00150] In one configuration, the apparatus 1002/1002 'for wireless communication includes means to detect a set of beams from a base station. The apparatus 1002/1002 'may further include means for selecting a beam from the beam array. The device
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66/133
1002/1002 'may also include the determination of at least one resource based on the selected beam. In one aspect, the at least one resource can include at least one of a radio frame index, a subframe index, a symbol index or a subcarrier region. The apparatus 1002/1002 'may further include means for transmitting, at least one given resource, a beam adjustment request to the base station, wherein the at least one determined resource indicates an index associated with the selected beam.
[00151] In one aspect, the beam adjustment request for the base station comprises a request for a BRRS. In one respect, at least one resource is included in the subframe associated with a RACH. In one respect, at least one resource is included in a bandwidth reserved for RACH transmission. In one respect, at least one resource is included in a bandwidth not reserved for RACH transmission. In one respect, bandwidth is reserved for scheduling the transmission of requests. In one respect, at least one resource is included in a PUCCH.
[00152] In one aspect, the apparatus 1002/1002 'may further include means for receiving, from the base station, an instruction to perform beam refinement on a UE receiver based on the request. The apparatus 1002/1002 'can further include the apparatus 1002/1002' performing beam refinement based on the request. In one aspect, the beam refinement performance at the UE receiver is still based on the selected beam.
[00153] The aforementioned means may be one or more of the aforementioned components of apparatus 1002
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67/133 and / or the processing system 1114 of the apparatus 1002 'configured to perform the functions cited by the means mentioned above. As described above, processing system 1114 may include Processor TX 368, Processor RX 356 and controller / processor 359. As such, in one configuration, the aforementioned means may be Processor TX 368, Processor RX 356, and the controller / processor 359 configured to perform the functions cited by the aforementioned means.
[00154] Figure 12 is a conceptual data flow diagram 1200 that illustrates the data flow between different media / components in an exemplary device 1202. The device can be a base station (for example, an mmW base station). Apparatus 1202 includes a receiving component 1204 that can receive signals from a UE (e.g., UE 1250). Apparatus 1202 can include a transmission component 1210 that can transmit signals to a UE (e.g., UE 1250).
[00155] In one aspect, the beam transmission component 1216 can be configured to transmit a first of the beams to the UE 1250. For example, the beam transmission component 1216 can be configured to transmit a respective BRS in a respective subframe synchronization of a respective beam. The first set of bundles can be a coarse set of bundles.
[00156] The UE 1250 can receive the first set of beams and select a better or preferred beam. The UE 1250 can then transmit a request for adjustment of
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68/133 beam (for example, a BRRS request. The receiving component 1204 can receive this request, which is performed on at least one resource, and provide the same to an index determination component 1212.
[00157] The index determination component 1212 can be configured to determine a beam index of a beam in the first set of beams based on at least one resource that carries the request. The index determination component 1212 can be configured to determine that the resource carries the beam adjustment request to determine a beam selected by the UE 1250. For example, a resource can include one from a radio frame, a subframe, a symbol or a subcarrier region. Each resource can correspond to a value, for example, a radio frame index, a subframe index, a symbol index or a subcarrier region. In one aspect, the index determination component 1212 may have stored in it or may have access to a mapping or table (for example, a lookup table) that indicates a respective resource (for example, a value or index) to which the beam index corresponds. For example, the index determination component 1212 can determine the beam index and then access a lookup table to determine a resource index or region that matches the beam index.
[00158] In one aspect, the resource is included in the subframe associated with a RACH. In one respect, the resource is included in a bandwidth reserved for RACH transmission. In one aspect, the feature is included in a width
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69/133 of band not reserved for RACH transmission. In one respect, bandwidth is reserved for scheduling the transmission of requests. In one aspect, the feature is included in a PUCCH.
[00159] In one aspect, the index determination component 1212 determines, within a range, the beam index based on a signal strength in different reception chains of the apparatus 1204 (for example, the reception chains included in the reception chains of the receiving component 1204) through which the request is received. For example, the receiving component 1204 can receive the request through a plurality of receiving chains. The index determination component 1212 can determine the signal strength of the request for each receiving chain through which the request is received. The index determining component 1212 can determine that each receiving chain is associated with at least one beam index.
[00160] The index determination component 1212 can provide an indication of the beam index selected by the UE 1250 for a beam refinement component 1214. The beam refinement component 1214 can determine a second set of beams to transmit to the UE 1250. The second set of beams can be a set of thin beams, which can be directionally and / or spatially closer to the beam selected by the UE 1250, whose index can be determined by the index determination component 1212. The refinement component of beam 1214 can provide an indication of the indices of the second set of
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70/133 beams for the 1216 beam transmission component.
[00161] The beam transmission component 1216 can be configured to transmit the second beam to the UE 1250. For example, the beam transmission component 1216 can be configured to transmit a respective BRRS in a respective synchronization subframe of a respective beam . The second set of bundles can be a thin set of bundles.
[00162] In one aspect, the beam transmission component 1216 can transmit, to the UE 1250, an instruction to perform beam refinement based on the request. In one aspect, the instruction to perform beam refinement can be based on the selected beam determined by index determination component 1212. The beam transmission component 1216 can perform beam tracking with the UE 1250.
[00163] The device can include additional components that execute each of the algorithm blocks in the above mentioned flowcharts of Figure 9. As such, each block in the above mentioned flowcharts of Figure 9 can be made by a component and the device can include one or more of these components. The components can be one or more hardware components specifically configured to execute the declared processes / algorithm, implemented by a processor configured to execute the declared processes / algorithm, stored in a computer-readable medium for implementation by a processor or some combination thereof .
[00164] Figure 13 is a 1300 diagram that
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71/133 illustrates an example of a hardware implementation for an apparatus 1202 'employing a 1314 processing system.
The 1314 processing system can be implemented with a bus architecture, generally represented by the 1324 bus. The 1324 bus can include any number of bus and bridge interconnection, depending on the specific application of the 1314 processing system and the general design restrictions. The 1324 bus interconnects several circuits, including one or more processors and / or hardware components, represented by processor 1304, components 1204, 1210, 1212, 1214, 1216 and the computer-readable medium / memory 1306. The 1324 bus can also connect several other circuits, such as timing sources, peripherals, voltage regulators and power management circuits, which are well known in the art and therefore [00165] The 1314 processing system can be coupled to a 1310 transceiver. The transceiver 1310 is coupled to one or more 1320 antennas. Transceiver 1310 provides a means of communication with various other devices through a means of transmission. Transceiver 1310 receives a signal from one or more antennas 1320, extracts information from the received signal and provides the extracted information to processing system 1314, specifically receiving component 1204. In addition, transceiver 1310 receives information from processing system 1314 , specifically the transmission component 1210, and based on the information received, generates a signal to be applied to one or more antennas 1320. The processing system 1314 includes a processor 1304 coupled to
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72/133 is a computer-readable medium / memory 1306. Processor 1304 is responsible for general processing, including running software stored on computer-readable medium 1306. The software, when run by processor 1304, makes the system 1314 processors perform the various functions described above for any particular device. The computer-readable medium / memory 1306 can also be used to store data that is handled by the 1304 processor when running the software. The processing system 1314 further includes at least one of the components 1204, 1210, 1212, 1214, 1216. The components may be software components running on processor 1304, resident / stored in the computer-readable medium / memory 1306, one or more hardware components attached to the 1304 processor, or some combination thereof. Processing system 1314 can be a component of base station 310 and can include memory 376 and / or at least one TX processor 316, processor RX 370, and controller / processor 375.
[00166] In one configuration, apparatus 1202/1202 'for wireless communication includes means for transmitting a first set of beams. Apparatus 1202/1202 'may further include means for receiving a beam adjustment request on at least one resource. In one aspect, the at least one resource may include at least one of a radio frame index, a subframe index, a symbol index or a subcarrier region. Apparatus 1202/1202 'may further include means for determining a beam index of a beam in the first set of beams
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73/133 based on at least one resource.
[00167] In one aspect, the beam adjustment request comprises a request to transmit a BRRS. In one aspect, apparatus 1202/1202 'may further include means for transmitting an instruction to carry out the beam tracking based on the request and the determined beam index. In one aspect, apparatus 1202/1202 'may further include means for performing beam tracking with the UE. In one aspect, apparatus 1202/1202 'may further include means for transmitting a second set of beams based on the beam index determined to carry out the beam tracking.
[00168] In one aspect, at least one resource is included in a PUCCH. In one respect, at least one resource is included in the subframe associated with a RACH. In one aspect, at least one resource is included in a bandwidth associated with RACH transmission. In one respect, at least one resource is included in a bandwidth not reserved for RACH transmission. In one respect, bandwidth is reserved for transmission of the scheduling request. In one aspect, the at least one resource indicates a range of indexes and a subcarrier of the at least one resource indicates the beam index within the range.
[00169] In one aspect, a subframe of the at least one resource indicates a range of indices, and apparatus 1202/1202 'further includes means for determining, within the range, the beam index based on a signal strength in strings receiving stations other than the base station through which the request is received.
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74/133 [00170] The aforementioned means may be one or more of the aforementioned components of the apparatus 1202 and / or the processing system 1314 of the apparatus 1202 'configured to perform the functions cited by the means mentioned above. As described above, processing system 1314 may include Processor TX 316, Processor RX 370 and controller / processor 375. As such, in one configuration, the aforementioned means may be Processor TX 316, Processor RX 370, and the controller / processor 375 configured to perform the functions cited by the aforementioned means.
[00171] With respect to Figures 14 and 15, two wireless communication methods are illustrated. As described in the present description, a base station can scan a set of beams transmitting these beams in different directions. The UE can observe these beams and then select a good beam, for example, the best current beam (for example, based on the highest received power measured for a BRS). According to another aspect, there may be a subframe in which the base station scans its receiving beam to hear the same set of directions. The UE can select a resource, for example, symbol and partition index, to inform the base station about the index of a selected beam. The base station, upon receiving the signal from the UE, can start communicating with the UE through the selected beam or start transmitting a BRRS to the UE.
[00172] According to several aspects, the UE can select a resource to indicate a beam index for
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75/133 the base station using one or more approaches (for example, a combination of the following approaches). According to a first approach, the UE can select a transmission time, for example, a symbol and / or partition index, based on the set of beams it has detected from the base station. According to a second approach, the UE can select one or more combinations of subcarrier index, cyclic offset and / or base station root index based on the previous signaling from the base station. According to this second approach, the base station can assign different combinations of cyclic displacement (s) and / or subcarrier region (s) to different UEs. As a result, different UEs can select the same beam index and transport it to the base station simultaneously, occupying different subcarrier regions, different cyclical displacements and / or different root indexes for the base station. In various respects, the base station can assign to each UE a subcarrier region, cyclic shift and / or root index through one or more combinations of MIB, SIB, PDCCH and / or RRC signaling. In aspects, the MIB can be transmitted through a physical broadcast channel (PBCH). In aspects, the SIB can be transmitted via extended or enhanced PBCH (ePBCH).
[00173] Figure 14 is a flow chart 1400 of a wireless communication method. The method can be performed by a UE (for example, the UE 502). A common person would understand that one or more operations can be omitted, transposed and executed at the same time.
[00174] In operation 1402, the UE can receive a
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76/133 first signal from a base station. In several respects, the first signal can indicate one or more of a subcarrier region and / or preamble (s) that should be used to indicate a beam index for the base station. In one aspect, the preamble can indicate one or more combinations of a cyclical shift and / or a root index of a sequence. In one aspect, the UE can receive the first signal through one or more of a MIB, SIB, PDCCH and / or RRC signaling. In aspects, the MIB can be transmitted through a PBCH. In aspects, the SIB can be transmitted via ePBCH. For example, UE 502 can receive a first signal from base station 504.
[00175] In operation 1404, the UE can detect a set of beams from a base station, for example, detecting a BRS transmitted in a synchronization subframe of each beam of the first set of beams, and identifying a corresponding index corresponding to each beam. In the context of Figure 5E, UE 502 can detect the first set of beams 521, 523, 525, 527, such as detecting a BRS transmitted in a synchronization subframe of each beam 521, 523, 525, 527. The first set of bundles can be odd indexed bundles.
[00176] In operation 1406, the UE can select a beam from the beam set. For example, the UE may determine that the beam carrying a BRS is stronger or preferable (for example, based on the power received from a BRS). The UE can select a beam based on the measurement of values for a received power or received quality associated with each of the first sets of beams,
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77/133 compare the respective values with each other and select the beam that corresponds to the highest value. The selected beam can correspond to a beam index on the base station. In one aspect, the UE can select the beam in association with handover to a neighboring cell. In the context of Figure 5F, UE 502 can select beam 523.
[00177] In operation 1408, the UE can determine at least one resource based on the selected beam and the first signal. For example, UE 502 can determine at least one resource based on the selected beam 523 and the first signal.
[00178] In one aspect, the at least one resource indicates at least one of a radio frame index, a subframe index, a symbol index or a subcarrier region that corresponds to the selected beam. In one respect, at least one resource is included in a PUCCH. In one respect, at least one resource is included in a subframe associated with RACH. In one respect, at least one resource is included in a bandwidth associated with RACH. In one respect, at least one resource is included in a subframe associated with a reserved channel to carry responses to reference mobility signals.
[00179] In operation 1410, the UE can transmit, to the base station in at least one determined resource, a second signal indicating a beam index associated with the selected beam, in one aspect, the second signal can include a request for the base station to transmit a BRRS. In one aspect, the second signal indicates to the base station that the base station must determine the
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78/133 beam. For example, UE 502 can transmit the second signal (for example, request 570) to base station 504.
[00180] Figure 15 is a flow chart 1500 of a wireless communication method. The method can be carried out by a base station (for example, the base station 504). A common person would understand that one or more operations can be omitted, transposed and executed at the same time.
[00181] In operation 1502, the base station can transmit a first signal to a UE. In several respects, the first signal may indicate one or more of a subcarrier region and / or preamble (s) that are to be used by the UE to indicate a beam index for the base station. In one aspect, the preamble can indicate one or more combinations of a cyclical shift and / or a root index of a sequence. In one aspect, the base station can transmit the first signal through one or more of a MIB, SIB, PDCCH and / or RRC signaling. In aspects, the MIB can be transmitted through a PBCH. In aspects, the SIB can be transmitted via ePBCH. For example, base station 504 can transmit a first signal from UE 502.
[00182] In operation 1504, the base station can transmit a first set of beams, such as transmitting a BRS a synchronization subframe of each beam of the first set of beams. The first set of bundles can be bundles with odd indices. In the context of Figure 5E, base station 504 can transmit the first set of beams 521, 523, 525, 527.
[00183] In operation 1506, the base station can receive a second signal from the UE. In one aspect, the second
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79/133 signal can be received on at least one resource from which the base station can determine the beam index. In one aspect, the second signal can be a BRRS. In one aspect, the second signal may indicate that the base station must determine the beam index (for example, based on at least one resource on which the second signal is carried). In the context of Figure 5F, base station 504 can receive the second signal (e.g., request 570) from UE 502.
[00184] In operation 1508, the base station can determine a beam index of a beam in the first set of beams based on the first signal and / or the second signal. For example, the base station can determine at least one resource that carries the request. For example, the base station can determine the beam index based on at least one or more of a subcarrier (s) region (s), preamble (s), cycle offset (s), sequence (s) and / or any combination thereof, which can be used by the UE to indicate a beam index for the base station. For example, base station 504 can determine the beam index based on a second signal (for example, request 570) received from UE 502. For example, base station 504 can determine a beam index of a beam selected by UE 502 in at least one resource that carries the second signal (for example, request 570).
[00185] Returning to Figures 16 and 17, aspects are illustrated to configure a UE with one or more RACH preambles based on more than one cyclic displacement value and one or more root strings for UE to transmit an adjustment request beam (also
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80/133 known as a beam failure recovery request). For example, a cyclic offset value may correspond to a beam adjustment request (for example, for beam recovery failure). A cyclic offset can be applied to a root sequence that is identified based on an initial root sequence index. For example, a base station can transmit a first set of beams, receive a beam adjustment request through at least one of the transmitted cyclic offset values, and determine a beam index of a beam in the first set of beams based on at least a cyclic offset value. In one aspect, a gNóB (Gnb) or base station carries cyclic displacement settings through one or more combinations of PBCH, minimum remaining system information (RMSI), other system information (OSI), RRC message or handover message . In one aspect, the UE transmits a beam adjustment request using a corresponding cyclic offset value to identify a new beam to the base station when the service and control beams fail. In one aspect, the base station configures UE with at least one cyclic offset value to transmit beam adjustment request across a region that is reserved for RACH, and configures the UE with another cyclic displacement value to transmit adjustment request for beam beam through a region not reserved for RACH. In many respects, the base station configures the UE with at least one cyclic offset value to carry the beam adjustment request via a free RACH procedure
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81/133 of contention, and configures the UE with another cyclic offset value to transmit the beam adjustment request through a contention-based RACH procedure. In several respects, the base station configures UE with at least one cyclic offset value to carry beam adjustment request when it is time synchronized with the base station, and configures the UE with another cyclic displacement value to transmit beam adjustment request when the UE is not time-synchronized with the base station. In many ways, a beam adjustment request can include a BRRS. In the UE, the UE can receive the setting of more than one cyclic offset value to send a beam adjustment request. The UE can receive a first set of bundles and select a bundle from the bundle. The UE can then send a beam adjustment request to the base station using at least one cyclic displacement value, and at least one cyclic displacement value can correspond to the selected beam (for example, indicating a corresponding beam index selected beam).
[00186] In some aspects, the same cyclic displacement values defined in LTE can be applied to format 0 and 1 of the preamble NR PRACH. In some respects, the same cyclic displacement values defined in LTE can be applied to formats 2 and 3 of the preamble NR PRACH, considering several parameters (for example, delay dispersion, storage time, filter length, etc.). For sequence length shorter than L = 839, NR supports sequence length of L = 127 or 139 with spacing
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82/133 {15, 30, 60, 120} kHz subcarrier (for example, based on the assumption that 240kHz subcarrier spacing may be unavailable for data / control). In some respects, 7.5 kHz subcarrier spacing is also possible.
[00187] In some respects, the following channel (s) may be supported for beam failure / recovery request for transmission: PRACH-based non-containment channel, which uses an orthogonal feature to features of other PRACH transmissions (for example, in the case of frequency division multiplexing (FDM), but it is possible to have other ways of obtaining orthogonality, including code division multiplexing (CDM) and / or time division multiplexing ( TDM) with other PRACH resources, and possible whether or not it has a different sequence and / or format than those of PRACH for other purposes). In some respects, PUCCH can be used to transmit a beam failure recovery request. In one respect, containment-based PRACH features can complement containment-free beam failure recovery features. In one aspect, from the traditional RACH resource pool, a four-step RACH procedure is used (in some ways, contention-based PRACH resources can be used, for example, if a new candidate beam does not have PRACH-like transmission resources containment).
[00188] For transmission of beam failure recovery request in PRACH, the resource to indicate beam failure recovery request can
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83/133 be CDM with other PRACH resources. In some respects, CDM can indicate the same sequence design with the preamble to PRACH. In some respects, the preambles for transmitting a PRACH beam failure recovery request are chosen from those for PRACH operation without content (for example, in the 3GPP standard, such as Rel-15). In some respects, the base station and the UE can support length 127 or length 139 as the length of the PRACH preamble sequence (also possible for different Ncs configurations for long and short sequences).
[00189] In some respects, NR can support contention-free random access through frequency division multiplexing with the regular PRACH region to carry beam failure recovery request. If a UE loses its current service beam, the UE can map a good downlink synchronization feature (DL SYNC) to the corresponding symbol index of the RACH partition. The UE can select one of the N subcarrier regions of the SR / beam recovery request region and transmit on the selected symbol of the RACH partition. A UE can select a PRACH type signal to transmit the beam retrieval request to a base station. Table 1 shows a possible numerology of the beam recovery request channel.
Partition duration (us) Subcarrier spacing (kHz) String length Symbol duration (us) Number of cyclical shifts by subcarrier region 125 60 139 33, 33 ~ 50
Table 1: Supported Number of Cyclic Offsets in
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Beam Failure Request Region.
[00190] In some respects, a base station may allow a much larger number of cyclical offsets to receive request for beam recovery in these partitions (for example, greater than for initial access, cell selection, etc.). For example, if the delay spread is approximately 300 ns, a base station can allow approximately 50 orthogonal features in each subcarrier region of the beam retrieval request region because the beam retrieval request sequence length is 16 , 67 us.
[00191] Thus, NR can support short RACH preamble format with a greater number of cyclic displacements to transmit request for recovery of beam failure through the channel based on non-contention which is multiplexed by frequency division with regular region of RACH. The value of Ncs in this region can be relatively low.
[00192] In one aspect, NR can support a short RACH preamble format with a relatively greater number of cyclic displacements to transmit request for beam failure recovery through the non-contention channel that is multiplexed by frequency division with region Regular RACH.
[00193] However, a UE can communicate a beam failure recovery request with a base station via PRACH preambles that are multiplexed by code division with regular PRACH preambles. UEs that transmit regular PRACH may not be synchronized
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85/133 temporarily with the base station. Thus, the base station can only support a low number of cyclical displacements in this region. A UE can be configured with a relatively high Ncs value if it transmits the beam recovery across this region.
[00194] During beam failure recovery request transmission, if a UE loses time synchronization, the UE will have to transmit beam failure recovery across the regular common PRACH region. Even if a UE is initially configured with a low Ncs value to carry beam failure recovery, the UE will have to use a high Ncs value to carry beam failure recovery through the regular regular PRACH region.
[00195] In some respects, a UE can carry a beam failure recovery request through PRACH preambles that are multiplexed by code division with common PRACH preambles. Ncs value (s) configured for this region can be the same as for regular RACH transmission.
[00196] If a UE loses timing synchronization during the beam failure recovery procedure, the UE may have to transmit a beam failure recovery request through the common time / frequency PRACH region. The Ncs value configured to transmit beam failure recovery across this region can be the same as for regular RACH transmission.
[00197] In view of the above, a base station can support the configuration of two Ncs values for a UE.
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A Nos value can be used to transmit the beam failure recovery request across a region that is multiplexed by frequency division with a PRACH region. The other Ncs value can be used to transmit regular PRACH or beam failure recovery when a UE loses its time synchronization.
[00198] Possible Ncs configurations can be defined in one or more 3GPP standards. By way of illustration, Table 2 shows some possible Ncs values for short sequence type RACH preamble formats. Table 2 considers relatively small Ncs values (for example, 2, 4, 6, etc.) for requesting beam failure recovery through the frequency division multiplexed region and also relatively high Ncs values (for example, 34, 46 , 69, etc.) to support RACH in higher cell sizes. In some respects, the values shown in Table 2 may be applicable to the short sequence type RACH preamble formats.
zeroCorrelationZoneConfig Ncs Value 0 0 1 2 2 4 3 6 4 8
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5 10 6 12 7 15 8 23 9 27 10 34 11 46 12 69 13 AT 14 AT 15 AT 16 AT
Table 2: Possible Values for Short String Type RACH Preamble Formats [00199] Figure 16 illustrates a 1600 method of wireless communication. The 1600 method can be performed by a base station. In operation 1602, the base station can send information to one UE indicating one or more cyclic displacement values and at least one root sequence, each cyclic displacement value being associated with a beam index of a set of beams transmitted by the station base. In one aspect, the information indicating at least one root sequence can be an initial root sequence, from which the UE can derive a root sequence and then apply a cyclic shift. In one aspect, information indicating one or more cyclic displacement values and the root sequence is sent to the UE via one or more of a PBCH, RMSI, OSI, an RRC message, a handover message or any combination thereof. In one aspect, information indicating one or more cyclic offset values indicates that a first cyclic offset value is associated with a region of a subframe that is reserved for a RACH, and a second cyclic offset value
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88/133 is associated with a region of a subframe that is not reserved for RACH. In one aspect, information indicating one or more cyclic displacement values indicates that a first cyclic displacement value is associated with a contention-free RACH, and a second cyclic displacement value is associated with a contention-based RACH. In one aspect, information indicating one or more cyclic offset values indicates that a first cyclic offset value is associated with time synchronization between the base station and the UE, and a second cyclic offset value is associated with a lack of synchronization between the base station and the UE. For example, For example, base station 504 can send information to the UE 502 indicating one or more cyclic offset values, each cyclic offset value being associated with a beam index of a beam array 524, 525, 526 transmitted by the base station.
[00200] In operation 1604, the base station can transmit the set of beams. For example, base station 504 can send signals through each beam in the beam array 524, 525, 526.
[00201] In operation 1606, the base station can receive, from the UE, a BAR, which can include a root sequence having a first cyclic offset applied to it. In one aspect, the BAR can be a request for a BRRS. In one aspect, the BAR is received from the UE based on the failure of at least one of a service beam or a control beam. For example, base station 504 can receive, from UE 502, a BAR, including a sequence
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89/133 root having a first cyclic offset applied to it.
[00202] In operation 1608, the base station can determine a beam index corresponding to a first cyclic offset value - the first cyclic offset value corresponding to the first cyclic offset. For example, the base station can identify a first cyclic offset value that corresponds to the first cyclic offset applied to the root sequence. The base station can access stored data (for example, a lookup or mapping table) that indicates correspondence between the cyclic displacement values and the beam indexes. The base station can identify the beam index corresponding to the first cyclic displacement value based on the stored data. For example, base station 504 can determine a beam index (e.g., beam 525) corresponding to a first cyclic offset value - the first cyclic offset value corresponding to the first cyclic offset. In one aspect, the base station can determine the beam index based on the combination of the root sequence and the cyclic offset applied to it.
[00203] In operation 1610, the base station can communicate with the UE based on a beam from the beam set that corresponds to the beam index corresponding to the first cyclic displacement value. In one aspect, the base station can transmit a BRRS based on the BAR through the beam that corresponds to the beam index. In another aspect, the base station can switch a current service beam to a beam that corresponds to the beam index. For example, the station
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90/133 base 504 can communicate with UE 502 through a beam (for example, beam 525) of the beam array (for example, beams 524, 525, 526) that corresponds to the beam index corresponding to the first offset value cyclic.
[00204] Figure 17 illustrates a wireless communication method. The 1700 method can be performed by a UE (for example, the UE 502). In operation 1702, the UE can receive, from a base station, information indicating one or more cyclic displacement values and at least one root sequence, each cyclic displacement value being associated with a beam index of a set of beams transmitted by the station base. The information indicating at least one root sequence can be an initial root sequence index from which the UE can generate or derive the root sequence. In one aspect, information indicating one or more cyclic displacement values and at least one root sequence is received via one or more of a PBCH, RMSI, OSI, an RRC message, a transfer message or any combination of these. In one aspect, information indicating one or more cyclical displacement values indicates that a first cyclical displacement value is associated with a region of a subframe that is reserved for a RACH, and a second cyclical displacement value is associated with a region of a subframe that is not reserved for RACH. In one aspect, information indicating one or more cyclical displacement values indicates that a first cyclical displacement value is associated with a contention-free RACH, and a second cyclical displacement value is associated with a contention-based RACH. In one respect,
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91/133 information indicating one or more cyclical displacement values indicates that a first cyclical displacement value is associated with time synchronization between the base station and the UE, and a second cyclical displacement value is associated with an absence of time synchronization between the base station and the UE. For example, UE 502 can receive, from base station 504, information indicating one or more cyclical displacement values, each cyclical displacement value being associated with a beam index of a transmitted beam array 524, 525, 526 the base station.
[00205] In operation 1704, the UE can receive the bundle of beams. For example, UE 502 can receive beam array 524, 525, 526 transmitted by base station 504.
[00206] In operation 1706, the UE can select a beam from the beam set for communication with the base station. For example, the UE can measure a channel quality (e.g., SNR) for one or more beams and can select the beam with a better or higher channel quality. For example, UE 502 can select beam 525 from beam array 524, 525, 526.
[00207] In operation 1708, the UE can identify a first value of cyclical displacement corresponding to the beam index of the selected beam. For example, the UE can access the information received from the base station indicating an association between cyclical displacement values and beam indices, and the UE can identify the cyclical displacement value associated with the beam index of the selected beam.
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For example, UE 502 can identify a first cyclic offset value corresponding to the beam index of the selected beam 525.
[00208] In operation 1710, the UE can transmit a BAR to the base station, which can include the root sequence with a first cyclic offset corresponding to the first identified cyclic offset value applied to the root sequence. In one aspect, the BAR can be a request for a BRRS. In one aspect, the UE can transmit the BAR when a current service beam and / or one or more control beams fail (for example, radiolink failure). For example, UE 502 can transmit a BAR to base station 504 via a first cyclic offset corresponding to the first identified cyclic offset value.
[00209] In operation 1712, the UE can communicate with the base station based on the selected beam that corresponds to the beam index corresponding to the first identified cyclic displacement value. For example, the UE can receive a BRRS for beam refinement, or the base station can switch the current service beam to the selected beam corresponding to the beam index. For example, UE 502 can communicate with base station 504 based on the selected beam 525 which corresponds to the beam index corresponding to the first identified cyclic offset value.
[00210] Figure 18 illustrates a 1800 wireless communication system. In the 1800 wireless communication system, a 1802 base station (for example, a gNB, eNB or
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93/133 another node B) can provide a cell in which a first set of UEs and a second set of UEs can operate. The first set of UEs can be time synchronized with the base station 1802. For example, the first set of UEs can include the first UE 1804a which is in communication with the base station 1802 via a current service beam (for example, the service beam 525).
[00211] The second set of UEs may not be time-synchronized with the base station 1802. For example, the second set of UEs may include the second UE 1804b, which can perform initial access, cell selection, cell reselection, loss of timing synchronization (eg, timing synchronization re-purchase) or handover to operate on cell 1806 provided by base station 1802. For example, the second UE 1804b can perform initial access, cell selection, cell re-selection, reacquisition of timing synchronization and / or handover to acquire timing synchronization with base station 1802 when the second UE 1804b enters cell 1806 and / or transitions from RRC standby mode to connected RRC mode.
[00212] In several aspects, a Zadoff-Chu sequence can be used to transmit a RACH preamble, for example, for initial access or for recovery from beam failure. The number of orthogonal or separable Zadoff-Chu strings that can occupy a set of time frequency resources (for example, a RACH region) may be dependent on the number of available
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94/133 cyclic shifts and root sequences associated with the Zadoff-Chu sequence. For example, base station 1802 can configure a particular number of Ncs cyclic offsets, an initial root sequence configuration and a maximum number of preambles in cell 1806. Base station 1802 can signal this Ncs value by starting the root index and / or maximum number of preambles for 1804ab UEs that must operate in cell 1806.
[00213] In several respects, the number of cyclic displacements Ncs can refer to the minimum interval between any two cyclic displacement values that are used in cell 1806. The number of cyclic displacements Ncs can be related to the maximum number of cyclic displacement values which can be supported for each initial root sequence. For example, for a sequence of length Zadoff-Chu, and base station 1802 sets the number of cyclic offsets Ncs to be 4 (for example, based on a zeroCorrelationZoneConfig value of 1), then cell 1806 can support a maximum of [ 139/4] or 34 cyclic displacement values for each initial root sequence.
[00214] In aspect, base station 1802 sends a set of RACH parameters to UEs in cell 1806. The set of RACH parameters can include at least one root sequence index. The root sequence index can include a starting root index or a logical root sequence number from which a UE can generate a RACH preamble sequence. The set of RACH parameters can include an index of
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95/133 configuration associated with a RACH procedure. A configuration index can indicate resources (s) that contain a RACH preamble, such as a system frame number (SFN), a preamble format, a subframe index, etc. The set of RACH parameters can include a received target power associated with a RACH procedure. The target power received can indicate the target power with which the base station 1802 would like to receive a RACH preamble (for example, -104 dBm). The set of RACH parameters can indicate the number of cyclic offsets available (for example, indicated as a zeroCorrelationZoneConfig value). Table 3 gives the Ncs to generate the preamble (for example, preamble format 4), according to some aspects. Table 4 provides the order of the Zadoff-Chu root sequences for the preamble 4 format.
zeroCorrelatIonZoneConfig Ncs Value 0 2 1 4 2 6 3 8 4 10 5 12 6 15 7 AT 8 AT 9 AT 10 AT 11 AT 12 AT 13 AT 14 AT 15 AT
Table 3
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96/133 iTogSCCJ i Seq.
: ras.z
Physical root sequence number (in an increased order of the ionic sequence number) to 113 ft
Ϊ 13: 44 5 · s J
l.to ft:
1] 13
4i i
ft
3 <> I, ssssssssssssssss $
4ft ... $
4>
ftft
7ft
1.
to; ··] 4
100 1 1
1'3 lift toft ft .to 7 —j — I— to 2 ΗI
1ft [3 I 1ft í * 2J 7
T1 ft ft ft
I ft ft · ftft
4ft ft 5
I 7'7 ft
7ft
H 2
4l 51 S 3'Jlft | ': 3
31 S
H] J ft 'L4ft% Ϊ i ft Ϊ O 4/3 & Ί § &
] B μ
[ft 1
-------- i ------ s>
H]: 2. LH ft] ft
4 [ft
.........
] ft ft ™ hi ft ft
4: I ft
Ito ft iq o
:
ft ft ft ft ft ft ft
1ft
9ft
4ft Ft ft ft ft
Table 4 [00215] After receiving a set of RACH parameters, a UE can determine whether the starting root index of the Zadoff-Chu sequence is capable of supporting the maximum number of preambles for cell 1806. If the UE determines that the cell 1806 is capable of supporting the number
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97/133 maximum of preambles for cell 1806 (for example, 64), then the UE can select cyclic offset values for that initial one. However, if the UE determines that cell 1806 is unable to support the maximum number of preambles for cell 180 6 given the set of RACH parameters, then the UE can select a starting root index by incrementally selecting a next starting root index. (for example, as determined by Table 4) and determine whether that initial root index can support the maximum number of RACH preambles for the number of cyclic offsets available. For example, base station 1802 sets the number of available cyclic offset values Nos to be 4, the starting root index (for example, logical root index) to be 6, and the maximum number of preambles supported in cell 1806 is 64. Cell 1806 then supports 34 cyclic shifts (that is, [139/4]). However, cell 1806 has a maximum number of preambles which is set to 64. Therefore, the UE can use the initial root sequence of 7, in addition to 6, to find all the cyclic and root offset combinations available for cell 1806 A UE can determine that the initial root sequence of 6 has a physical root sequence number of 136 (for example, row 1 and column 6 of Table 4) and the initial root sequence of 7 has a physical root sequence of 4 (for example example, row 1 and column 7 of Table 4). The UE can then select cyclic shifts from the physical root sequences 136 and 4, to generate the 64 preambles supported in cell 1806.
[00216] In some respects, the preambles to
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RACH in cell 1806 can be multiplexed by code division. For example, RACH preambles for initial access, cell selection, cell re-selection and / or handover (eg, RACH preambles for UEs not time-synchronized) can be multiplexed by code division with RACH preambles for retrieval beam failure (for example, RACH preambles for synchronized UEs), for example, in region 712 including the resource (s) reserved for RACH. To accommodate multiplexing by code division of RACH preambles for initial access, cell selection, cell re-selection, handover, etc. with RACH preambles for beam failure recovery, the base station 1802 can configure different sets of RACH parameters for UEs that should use RACH for initial access, cell selection, cell re-selection, handover, etc. and UEs that must use RACH for beam failure recovery. If the same set of RACH parameters was used for both sets of UEs, the collision can occur on the RACH resource (s) (for example, region 712). As a first set of UEs that transmit RACH preambles for beam failure recovery are time synchronized with the base station 1802, a greater number of cyclical offsets (for example, lower Ncs value) may be available than available for a second set of UEs that transmit RACH preambles for initial access, cell selection, cell re-selection, handover, etc. The lower number of cyclical shifts for the second set of UEs may be due to timing misalignment as a result of
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99/133 interference and / or round trip time (RTT), which may not be suffered by the first set of UEs because the first set of UEs is already time-synchronized with the base station 1802.
[00217] In several respects, the first UE 1804a can be time synchronized with base station 1802 in cell 1806. For example, the first UE 1804a may have already performed initial access and operate in a RRC connected mode with base station 1802 The first UE 1804a can communicate with base station 1802 through a first service beam (for example, beam 525). However, the first service beam may fail, for example, due to the obstruction that causes the radiolink to fail. Therefore, the first UE 1804a, although time-synchronized with base station 1802, may have to inform the base station of the beam failure in order to perform a beam failure recovery procedure.
[00218] Also in cell 1806, the second UE 1804b may not be synchronized in time with the base station 1802, for example, when the second UE 1804b is performing initial access, cell selection, cell re-selection, handover, etc. Consequently, base station 1802 can configure a first set of RACH parameters for a first set of UEs (for example, including the first UE 1804a) which are time synchronized with base station 1802, but can configure a second set of RACH for a second set of UEs (for example, including the second UE 1804b). The initial root indices and numbers of available cyclic displacements Ncs
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100/133 (indicated as zeroCorrelationZoneConfig) may differ. In addition, the maximum number of preambles available may be different (for example, more preambles available for UEs that are time synchronized).
[00219] As an example, base station 1802 can determine or configure a first set of parameters 1810a-b associated with a first RACH procedure. The first set of parameters 1810a-b can be configured for a first set of UEs (e.g., time-synchronized UEs, including the first UE 1804a). The first set of RACH 1810a-b parameters can be associated with beam failure recovery. In some respects, the first RACH procedure (for example, performed based on the first set of parameters 1810a-b) may be a contention-free RACH procedure.
[00220] Base station 1802 can determine or configure a second set of RACH 1812ab parameters associated with a second RACH procedure. The second set of parameters 1812a-b can be configured for a second set of UEs (for example, UEs not time-synchronized, including the second UE 1804b). The second set of RACH 1812a-b parameters can be associated with initial access, cell selection, cell re-selection, loss of timing synchronization and / or handover. In some respects, the second RACH procedure (for example, performed based on the second set of parameters 1812ab) may be a contention-based RACH procedure.
[00221] In several aspects, the first set
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101/133 of parameters 1810a-b and the second set of parameters 1812a-b can include different parameter values that are used for the first RACH procedure and the second RACH procedure. For example, the first set of parameters 1810a-b and the second set of parameters 1812a-b can each be used for generating a preamble and transmitting that preamble (for example, when transmitting a preamble and in which resource). In several respects, both the first set of parameters 1810a-b and the second set of parameters 1812a-b can include values indicating at least one root sequence index, a configuration index, a target power received, a number of cyclic offsets for each root sequence, a maximum number of RACH preamble transmissions, a power ramp step, a candidate beam limit and / or a frequency offset. In one aspect, each initial root index can indicate an initial root index of a Zadoff-Chu sequence. In another respect, each initial root index can indicate a primitive polynomial of an M sequence.
[00222] While the first set of parameters 1810a-b and the second set of parameters 1812ab can both include parameters for the respective RACH procedures, several parameters can be different and / or include different values. For example, the number of cyclic offsets for each sequence of roots in the first set of parameters 1810a-b may be greater than the number of cyclic offsets for each sequence of roots in the second set of parameters 1812a-b. In
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102/133 In some respects, the two sets of RACH parameters can allow the same number of root sequences. However, the first set of RACH 1810a-b parameters can allow a greater number of cyclic offsets per root sequence than the second set of RACH 1812a-b parameters. Suitably, the first set of RACH 1810a-b parameters can allow a higher number of RACH preambles in each time frequency resource than the number of RACH preambles available based on the second set of RACH 1812a-b parameters, which has a smaller number of available cyclic shifts.
[00223] For the first set of parameters 1810a-b, the root sequence index indicated as a PRACH root sequence index for beam failure recovery (BFR) (for example, RootSequencelndex-BFR). The root sequence index can include values between {0, 1, 137}. The configuration index can be indicated as a PRACH configuration index for requesting beam failure (for example, ra-PreamblelndexConfig-BFR) and can have values between {0, 1, ..., 255} (in another aspect, the configuration index can include values between {0, 1,..., 255}). In some respects, the PRACH configuration index can provide an index for a table that is stored in the second UE 1804b, as defined by a 3GPP technical specification (for example, 38,211). The target power received can be given as a target power received as a preamble (for example, preamblereceivedTargetPower) and can have a range of six bits. The number of cyclic shifts for each root sequence can be indicated indirectly
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103/133 as a zeroCorrelationZoneConfig and can have a value between {0, 1, 2, 3, 15}. In one respect, zeroCorrelationZoneConfig can be defined by a 3GPP technical specification (for example, 38,211). The maximum number of preamble transmissions can be given as a maximum number of beam failure request transmissions (for example, PreambleTransMax-BFR). The power ramp step can be given as a power ramp step for a beam failure request via PRACH (for example, powerRampingStep-BFR). The candidate beam limit can be given as an identification of a candidate beam (for example, Beam-failure-candidate-beam-threshold). The frequency deviation can be given as a beam failure recovery frequency deviation (for example, prachFreqOffset-BFR). In some respects, one or more parameters of the second set of parameters can be defined in one or more 3GPP technical specifications (for example, 38.211, 38.213, 38.331, etc.).
[00224] For the second set of parameters 1812a-b, the root sequence index is indicated as a PRACH root sequence index (for example, PRACHRootSequenceindex). The root sequence index can include values between {0, 1, ..., 837} for the logical sequence number L = 839 and values between {0, 1, ..., 137} for the logical sequence number root L = 139. The configuration index can be indicated as a PRACH configuration index (for example, PRACHConfigurationlndex) and can have values between {0, 1, 255}. In some respects, the PRACH configuration index can provide an index for a table
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104/133 which is stored in the first UE 1804a, as defined by a 3GPP technical specification (for example, 38,211). The received target power can be given as a preamble of the received target power for beam failure request for PRACH (for example, PreamblelnitialReceivedTargetPower-BFR). The number of cyclic offsets for each root sequence can be indicated indirectly as a ZeroCorrelationZoneConfig for beam failure recovery (for example, ZeroCorrelationZoneConfig-BFR), and can have a value between {0, 1, 2, 3, ···, 15). In one aspect, the zeroCorrelationZoneConfig for beam failure recovery can be defined by a 3GPP technical specification (for example, 38,211). The maximum number of preamble transmissions can be given as a maximum number of preamble transmissions. The power ramp step can be given as a power ramp step for PRACH (for example, powerRampingStep). The candidate beam limit can be given as an identification of a candidate beam (for example, Beam-failure-candidate-beam-threshold). The frequency shift can be given as a shift from the lower PRACH transmission timing in the frequency domain with respective to PRB 0 (e.g., PRACH frequency start). In some respects, one or more parameters of the second set of parameters can be defined in one or more 3GPP technical specifications (for example, 38.211, 38.213, 38.331, etc.).
[00225] As an example, the first set of parameters of RACH 1810a-b can indicate a number of
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105/133 available cyclic offs Ncs such as 2 (for example, zeroCorrelationZoneConfig-BFR value of 0) and an initial root index (for example, logical root sequence number or RootSequencelndex-BFR) of 1 for a number of preambles equal to 192 As an example, the second set of RACH parameters 1812a-b can indicate a number of available cyclic offsets such as 4 (for example, zeroCorrelationZoneConfig value of 1) and an initial root index (for example, logical root sequence number ) of 5 for a number of preambles equal to 64.
[00226] Base station 1802 can signal the first set of RACH 1810a-b parameters and the second set of RACH 1812a-b parameters. For example, base station 1802 can signal the first set of RACH parameters 1810a-b via RRC signaling, and can signal the second set of RACH parameters 1812a-b as broadcast. In several respects, the base station 1802 can signal either the first set of RACH parameters 1810a-be / or the second set of RACH parameters 1812ab via a PBCH, a control channel, a minimum remaining system information message (RMSI ) another system information message (OSI), an RRC message, a handover message or any combination thereof.
[00227] The first UE 1804a can receive at least the first set of parameters of RACH 1810a. In some aspects, the first UE 1804a can receive the second set of RACH parameters 1812a, for example, when the first UE 1804a performs initial access to become time synchronized with base station 1802.
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106/133 [00228] The first UE 1804a can select the first set of RACH 1810a parameters because the first UE 1804a is time synchronized in cell 1806. For example, the first UE 1804a can communicate with base station 1802 via a service beam (for example, service beam 525). However, the first UE 1804a can detect a failure (e.g., radiolink failure) of the first service beam. For example, the quality of the channel through the first service beam may fall below a threshold.
[00229] The first UE 1804a can identify a new beam index corresponding to a new service beam. The first UE 1804a can determine to carry out a beam failure recovery procedure. For example, the first UE 1804 can select the first set of RACH 1810a parameters for the beam failure recovery procedure. The first UE 1804a can generate a RACH preamble using the physical root indexes of 1, 138 and 2 (corresponding to the first 3 columns in the first row of Table 4) because each initial root index can support 68 cyclic shifts (that is, [= 139/2]). As part of a first RACH procedure, the first UE 1804a can then send the generated RACH preamble 1814 to base station 1802, for example, in resource (s) reserved for RACH (for example, region 712). The generated RACH preamble 1814 can indicate a request for beam failure recovery. In several respects, the RACH preamble generated 1814 may indicate a new service beam index, for example, based on one or more resources that contain the
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107/133 preamble to RACH 1814, the preamble to RACH 1814, the cyclical offset used for the preamble to RACH 1814, the root index used for the preamble to RACH 1814, or another aspect associated with the preamble to RACH 1814.
[00230] Base station 1802 can receive the preamble to RACH 1814. Base station 1802 can determine that the preamble to RACH 1814 is for a beam failure recovery procedure, for example, based on one or more resources that contain the preamble of RACH 1814, the preamble of RACH 1814, the cyclical displacement used for the preamble to RACH 1814, the root index used for the preamble to RACH 1814, or another aspect associated with the preamble to RACH 1814. As described above, base station 1802 can determine an index for a new service beam based on the resource (s) that carry the preamble to RACH 1814.
[00231] In aspects, the base station 1802 can then perform the beam failure recovery procedure with the first UE 1804a. For example, base station 1802 can select a new service beam. In one aspect, base station 1802 can include a mapping that maps one or more resources that contain a RACH preamble, a RACH preamble, a cyclical offset used for the RACH preamble, a root index used for the RACH preamble or another aspect associated with the preamble to RACH to radiate indices. Therefore, base station 1802 can determine a new beam based on the beam index indicated by at least one of the one or more resources that carry the RACH preamble 1814, the RACH preamble
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1814, the cyclic offset used for the RACH 1814 preamble, the root index used for the RACH 1814 preamble, or another aspect associated with the RACH 1814 preamble. Base station 1802 can then communicate with the first UE 1804a via the new service beam corresponding to the beam index indicated by the first UE 1804a.
[00232] The second UE 1804b can select the second set of RACH 1812b parameters received by the second UE 1804b, for example, when the second UE 1804b is to perform initial access, cell selection, cell reselection, loss of synchronization timing and / or delivery. The second UE 1804b can then perform a second RACH procedure (for example, based on containment or non-containment) for initial access, cell selection, cell reselection, loss of timing synchronization and / or handover based on the second set of parameters of RACH 1812b. For example, the second UE 1804b can use the physical root indexes of 136 and 4, because each root index can support 34 (that is, cyclic displacement values [139/4]). The second UE 1804b can generate a second preamble of RACH 1816 and transmit the second preamble of RACH 1816 to base station 1802 for initial access, cell selection, cell re-selection, loss of timing synchronization or handover. After the second UE 1804b acquires timing synchronization with the base station 1802 (for example, based on the second preamble of RACH 1816), the second UE 1804b can use the first set of parameters 1810b to recover from the beam failure, as
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[00233] Figure 19 is a 1900 method of wireless communication by a base station (for example, base station 1802). In operation 1902, the base station can determine or configure a first set of parameters associated with a first RACH procedure. For example, the base station can select a set of parameters that are associated with a RACH procedure for beam failure recovery, and the base station can identify a respective value for each parameter in the parameter set.
[00234] The first set of parameters being associated with the recovery of beam failure. In one aspect, the first set of parameters can include values indicating at least one root sequence index, a configuration index, a target power received, a number of cyclic offsets for each root sequence, a maximum number of RACH preamble transmissions , a power ramp step, a candidate beam limit and / or a frequency offset.
[00235] The first set of parameters can be for a first set of UEs that can be synchronized over time with the base station. The first set of RACH parameters can be associated with a beam failure recovery procedure.
[00236] In the context of Figure 18, base station 1802 can determine or configure the first set of RACH parameters 1810a-b for a first set of UEs in cell 1806, including the first UE 1804a. The first set of RACH 1810a-b parameters can be for use in
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110/133 a RACH procedure associated with beam failure recovery.
[00237] In operation 1904, the base station can determine or configure a second set of parameters associated with a second RACH procedure. The second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover.
[00238] In one aspect, the second set of parameters may include values indicating at least one of a root sequence index, a configuration index, a target power received, a number of cyclic offsets for each root sequence, a maximum number of RACH preamble transmissions, a power ramp step, a candidate beam limit and / or a frequency shift.
[00239] In one aspect, the available number of cyclic offsets for each root sequence in the first set of parameters is greater than the number of available cyclic offsets for each root sequence in the second set of parameters. For example, the Ncs value corresponding to a first zeroCorrelationZoneConfig value in the first parameter set is less than that corresponding to the second zeroCorrelationZoneConfig value in the second parameter set.
[00240] The second set of parameters may be for a second set of UEs that may not be time-synchronized with the base station. The second set of RACH parameters can be associated with initial access, cell selection, cell re-selection, loss of
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111/133 timing and / or handover synchronization.
[00241] In the context of Figure 18, base station 1802 can determine or configure the second set of parameters 1812a-b for a second set of UEs in cell 1806, including the second UE 1804b. The second set of parameters 1812a-b can be used for a second RACH procedure associated with at least one initial access, cell selection, cell re-selection, loss of timing synchronization and / or transfer.
[00242] In operation 1906, the base station can send information indicating the first set of RACH parameters. In one aspect, information indicating the first set of RACH parameters can be sent via one or more of a PBCH, a control channel, an RMSI message, an OSI message, an RRC message, a handover message, or any combination thereof. In the context of Figure 18, base station 1802 can send the first set of RACH parameters 1810a-b.
[00243] In operation 1908, the base station can send information indicating the second set of parameters. In one aspect, information indicating the second set of RACH parameters can be sent via one or more of a PBCH, a control channel, an RMSI message, an OSI message, a SIB, a MIB, a handover message or any combination of them. In the context of Figure 18, base station 1802 can send the second set of RACH parameters 1812a-b.
[00244] In operation 1910, the base station can receive, from a first UE, a first preamble of RACH
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112/133 based on the first set of RACH parameters. In one aspect, the first UE can be time synchronized with the base station. In one respect, the first preamble to RACH can be received in a set of resources reserved for RACH. In one aspect, the base station can determine that the first preamble to RACH is for a beam failure recovery procedure. In the context of Figure 18, base station 1802 can receive, from the first UE 1804a, the preamble of RACH 1814 for a first RACH procedure that can be associated with beam failure recovery.
[00245] In operation 1912, the base station can identify a beam index for communication with the first UE based on the receipt of the first RACH preamble. For example, the base station may determine that the first RACH preamble is for a beam failure recovery procedure, for example, based on one or more features that carry the first RACH preamble, the first RACH preamble, an offset cyclic used for the first RACH preamble, a root index used for the first RACH preamble or another aspect associated with the first RACH preamble. In aspects, the base station can then perform the beam failure recovery procedure with the first UE. For example, the base station can select a new service beam. In one aspect, the base station can include a mapping that maps one or more resources that contain a RACH preamble, a RACH preamble, a cyclic offset used for the RACH preamble, a root index used for the preamble
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113/133 of RACH or other aspect associated with the preamble of RACH to radiate indexes. Therefore, the base station can determine a new beam based on the beam index indicated by at least one of the one or more resources that carry the first RACH preamble, the first RACH preamble, the cyclic offset used for the first preamble of RACH, the root index used for the first RACH preamble or other aspect associated with the first RACH preamble. The base station can then communicate with the first UE via the new service beam corresponding to the beam index indicated by the first UE based on the first RACH preamble. In the context of Figure 18, base station 1802 can identify a beam index for communication with the first UE 1804a based on receipt of the first preamble to RACH 1814.
[00246] In operation 1914, the base station can receive, from a second UE of the second set of UE, a second preamble of RACH based on the second set of RACH parameters. The second RACH preamble can be received for a second RACH procedure (for example, contention-based RACH procedure). In one aspect, the second RACH preamble can be received in the feature set as the first RACH preamble (for example, code division multiplexing with the first RACH preamble). In one aspect, the base station can determine that the second preamble of RACH is for one of initial access, cell selection, cell re-selection, timing re-acquisition or handover. In the context of Figure 18, base station 1802 can receive the second preamble to RACH 1816 from
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114/133 according to EU 1804b based on the second set of RACH parameters 1812b.
[00247] Figure 20 illustrates a 2000 method of wireless communication for a UE (for example, the first UE 1804a and / or the second UE 1804b). In the 2002 operation, the UE can receive, from a base station, a first set of parameters associated with a first RACH procedure. The first set of parameters being associated with beam failure recovery. In one aspect, the first set of parameters can include values indicating at least one root sequence index, a configuration index, a received target power, a number of cyclic offsets for each root sequence, a maximum number of RACH preamble transmissions , a power ramp step, a candidate beam limit and / or a frequency offset.
[00248] The first set of parameters can be for a first set of UEs that can be synchronized over time with the base station. The first set of RACH parameters can be associated with a beam failure recovery procedure.
[00249] In one aspect, the UE can receive information indicating the first set of RACH parameters through one or more of a PBCH, a control channel, an RMSI message, an OSI message, an RRC message, a handover message or any combination thereof.
[00250] In the context of Figure 18, the first UE 1804a can receive, from base station 1802, the first set of RACH 1810a parameters for a first
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RACH in cell 1806. The first set of RACH parameters 1810a can be for use in a RACH procedure associated with beam failure recovery.
[00251] In operation 2004, the UE can receive, from the base, a second set of parameters associated with a second RACH procedure. The second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover. In one aspect, the second set of parameters may include values indicating at least one root sequence index, a configuration index, a target power received, a number of cyclic displacements for each root sequence, a number
maximum in transmissions in preamble to RACH, a stage in ramp in power, one beam limit candidate and / or one Detour in frequency. [00252] On one aspect, the number available in
cyclic offsets for each root sequence in the first set of parameters is greater than the available number of cyclic offsets for each root sequence in the second set of parameters. For example, the Ncs value corresponding to a first zeroCorrelationZoneConfig value in the first parameter set is less than that corresponding to the second zeroCorrelationZoneConfig value in the second parameter set.
[00253] The second set of parameters can be for a second set of UEs that may not be synchronized in time with the base station. The second set of RACH parameters can be associated with access
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116/133 initial, cell selection, cell re-selection, loss of timing synchronization and / or handover.
[00254] In one aspect, the UE can receive information indicating the second set of RACH parameters through one or more of a PBCH, a control channel, an RMSI message, an OSI message, a SIB, a MIB, a message handover, or any combination thereof.
[00255] In the context of Figure 18, the first UE 1804a can receive, from base station 1802, the second set of RACH parameters 1812a for a first RACH procedure in cell 1806. The second set of parameters 1812a can be used for a second RACH procedure associated with at least one initial access, cell selection, cell re-selection, loss of timing synchronization and / or handover.
[00256] In operation 2006, the UE can select one of the first set of RACH parameters or the second set of RACH parameters. For example, the UE can detect a beam failure (for example, failure of the radiolink through a service beam). The UE can identify a new beam index for a new service beam. The UE can select the first set of RACH parameters for the beam failure recovery procedure.
[00257] In another example, the UE may determine to execute, with the base station, at least one of initial access, cell selection, cell re-selection, re-acquisition of timing synchronization and / or handover. Based on this determination, the UE can select the second set of parameters to perform a second procedure
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117/133 of RACH for access, cell selection, cell re-selection, re-acquisition of timing synchronization and / or handover.
[00258] In the context of Figure 18, the first UE 1804a can select the first set of RACH 1810a parameters instead of the second set of RACH 1812a parameters when there is a beam failure during communication with base station 1802. Alternatively, the first UE 1804a can select the second set of RACH 1812a parameters instead of the first set of RACH 1810a parameters when the first UE 1804a must perform an initial access, cell selection, cell re-selection, timing and / or handover.
[00259] In one aspect, operation 2006 includes operation 2020. In operation 2020, the UE can detect a failure of a service beam used for communication between the UE and the base station. For example, the UE can obtain one or more measurements indicative of the quality of the channel through a beam used for communication between the UE and the base station. The UE can compare at least one of the measurements against a limit. If at least one measurement does not meet the limit (for example, it does not reach the limit), then the UE can determine that the channel is degraded and there is a radiolink failure through the current service beam. Based on the detected service beam failure, the UE can determine whether to perform a beam failure recovery procedure using a first RACH procedure.
[00260] In the context of Figure 18, the first UE 1804a can detect failure of a service beam (for example, beam 525) used for communication between the first
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UE 1804a and base station 1802.
[00261] In operation 2008, the UE can generate a RACH preamble based on the parameter selected from the first set of RACH parameters or the second set of RACH parameters. For example, the UE can identify a root sequence, and then the UE can cycle the sequence according to the available number of cyclic offsets indicated for the UE by the base station in the selected set of parameters. For example, the UE can generate a RACH preamble based on the first set of RACH parameters, in order to indicate a request for beam failure recovery, base station after losing time synchronization.
[00262] Illustratively, the UE can generate a RACH preamble using the physical root indexes of 1, 138 and 2 (corresponding to the first 3 columns of the first row of Table 4) because each initial root index can support 68 cyclic displacements ( that is, [139/2]. As part of a first RACH procedure, the UE can then send the generated RACH preamble to the base station, for example, in a reserved resource (s) for RACH (for example , region 712) The generated RACH preamble can be used to indicate a beam failure recovery request In several respects, the generated RACH preamble can indicate a new service beam index, for example, based on one or more features that contain the RACH preamble, the RACH preamble, the cyclic offset used for the RACH preamble, the root index used for the RACH preamble, or other aspect associated with the RACH preamble.
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119/133 [00263] In the context of Figure 18, the first UE 1804a can generate the preamble of RACH 1814 based on the first selected set of RACH 1810a parameters.
[00264] In operation 2010, the UE can send the generated RACH preamble to the base station. For example, the UE can send the generated RACH preamble to the base station in a set of resources reserved for RACH, in which the RACH preambles for initial access, cell selection, cell re-selection, timing synchronization re-acquisition or handover can be multiplexed by code division. In the context of Figure 18, the first UE 1804a can send the RACH 1814 preamble to base station 1802.
[00265] Figure 21 is a conceptual data flow chart 2100 that illustrates the data flow between different media / components in an exemplary device 2102. The device may be a UE. Apparatus 2102 includes a receiving component 2104 that can be configured to receive signals from an mmW base station (e.g., base station 2150). Apparatus 2102 may include a transmission component 2110 configured to transmit signals to an mmW base station (e.g., base station 2150).
[00266] In aspects, the receiving component 2104 can receive, and provide to a RACH 2108 component, a first set of parameters associated with a first RACH procedure, the first RACH procedure being associated with the recovery of beam failure with the base station 2150. The receiving component 2104 can receive and provide a RACH 2108 component, a second set of parameters
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120/133 associated with a second RACH procedure, the second RACH procedure being associated with an initial access, cell selection, cell re-selection, loss of timing synchronization or handover. The RACH 2108 component can generate a RACH preamble based on the first set of parameters or based on the second set of parameters. The RACH component 2108 can send the generated RACH preamble to the transmission component 2110 and the transmission component 2110 can transmit the generated RACH preamble to the base station 2150, for example, to indicate beam failure recovery.
[00267] In one aspect, the first set of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power associated with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first procedure RACH and PRACH frequency deviation associated with the first RACH procedure.
[00268] In one aspect, the beam detection component 2106 can detect failure of a service beam used for communication between the device 2102 and the base station 2150. The beam detection component 2106 can select the first set of parameters based on on the detected failure of the service beam and indicate to the
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RACH 2108 that the first set of parameters should use for a first RACH procedure.
[00269] In one aspect, sending the generated RACH preamble indicates at least one of a beam failure request or a second beam index corresponding to a second beam from the base station 2150. In one aspect, the first set of parameters is received via RRC signaling. In one aspect, device 2102 is time-synchronized in the cell provided by base station 2150. In one aspect, the second set of parameters is received in a handover message, an RMSI message or an OSI message.
[00270] The apparatus may include additional components that execute each of the algorithm blocks in the aforementioned flowcharts of Figure 20. As such, each block in the aforementioned flowcharts of Figure 20 may be made by a component and the apparatus may include one or more of these components. The components can be one or more hardware components specifically configured to execute the declared processes / algorithm, implemented by a processor configured to execute the declared processes / algorithm, stored in a computer-readable medium for implementation by a processor or some combination thereof .
[00271] Figure 22 is a diagram 2200 that illustrates an example of a hardware implementation for a device 2102 'employing a 2214 processing system. The 2214 processing system can be implemented with a bus architecture, generally represented by the 2224 bus. The 2224 bus can include any
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122/133 number of interconnect buses and bridges depending on the specific application of the 2214 processing system and the general design restrictions. The 2224 bus interconnects several circuits, including one or more processors and / or hardware components, represented by the 2204 processor, the 2104, 2106, 2108, 2110 components and the computer / memory readable medium 2206. The 2224 bus can also link several other circuits, such as timing sources, peripherals, voltage regulators and power management circuits, which are well known in the art and, therefore, will not be described below.
[00272] The processing system 2214 can be coupled to a transceiver 2210. Transceiver 2210 is coupled to one or more antennas 2220. Transceiver 2210 provides a means of communication with several other devices through a transmission medium. The transceiver 2210 receives a signal from one or more antennas 2220, extracts information from the received signal and provides the extracted information to the processing system 2214, specifically the receiving component 2104. In addition, the transceiver 2210 receives information from the processing system 2214 , specifically the transmission component 2110, and based on the information received, generates a signal to be applied to one or more antennas 2220. The processing system 2214 includes a processor 2204 coupled to a computer-readable medium / memory 2206. Processor 2204 is responsible for general processing, including running software stored in the computer / human readable medium 2206. The software, when run by the 2204 processor, makes the processing system
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2214 perform the various functions described above for any particular device. The computer-readable medium / memory 2206 can also be used to store data that is handled by the processor 2204 when running the software. The processing system 2214 further includes at least one of the components 2104, 2106, 2108, 2110. The components may be software components running on processor 2204, resident / stored in computer-readable medium / memory 2206, one or more components of hardware attached to the 2204 processor, or some combination thereof. The processing system 2214 can be a component of the UE 350 and can include the 360 memory and / or at least one of the TX 368 processor, the RX 356 processor, and the 359 controller / processor.
[00273] In one configuration, the device 2102/2102 'for wireless communication includes means to receive, from a base station, a first set of parameters associated with a first RACH procedure, the first RACH procedure being associated with a beam failure recovery with the base station. Apparatus 2102/2102 'may also include means for receiving, from the base station, a second set of parameters associated with a second RACH procedure, the second RACH procedure being associated with an initial access, cell selection, reselection loss of timing, or handover. Apparatus 2102/2102 'may further include means for generating a RACH preamble based on the first set of parameters or based on the second set of parameters. The 2102/2102 'device can also
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124/133 include means for sending the generated RACH preamble to the base station.
[00274] In one aspect, the first set of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power associated with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first procedure RACH and PRACH frequency deviation associated with the first RACH procedure.
[00275] The apparatus 2102/2102 'may also include means for detecting failure of a service bar used for communication between the apparatus 2102/2102' and the base station; and means for selecting the first set of parameters based on the detected failure of the service beam.
[00276] In one aspect, sending the generated RACH preamble indicates at least one of a beam failure request or a second beam index corresponding to a second beam from the base station. In one aspect, the first set of parameters is received via RRC signaling. In one aspect, apparatus 2102/2102 'is time-synchronized in the cell. In one aspect, the second set of parameters is received in a handover message, an RMSI message or an OSI message.
[00277] The means mentioned above can be a
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125/133 or more of the above-mentioned components of apparatus 2102 and / or processing system 2214 of apparatus 2102 'configured to perform the functions cited by the aforementioned means. As described above, processing system 2214 may include Processor TX 368, Processor RX 356 and controller / processor 359. As such, in one configuration, the aforementioned means may be Processor TX 368, Processor RX 356, and the controller / processor 359 configured to perform the functions cited by the aforementioned means.
[00278] Figure 23 is a conceptual data flow diagram 2300 that illustrates data flow between different media / components in an exemplary 2302 device. The device can be a base station. Apparatus 2302 includes a receiving component 2304 that can be configured to receive signals from a UE (e.g., UE 2350). Apparatus 2302 may include a transmission component 2310 configured to transmit signals to a UE (e.g., UE 2350).
[00279] In aspects, the RACH 2308 component can determine a first set of parameters associated with a first RACH procedure, the first set of parameters being associated with beam failure recovery for a first UE in the cell. The RACH 2308 component can provide the first parameter set for the 2310 transmission component, and the 2310 transmission component can send the first parameter set for the first UE 2350.
[00280] In several aspects, the first set
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126/133 of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power associated with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure.
[00281] In addition, the RACH 2308 component can determine a second set of parameters associated with a second RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover. The transmission component 2310 can send the second set of parameters in the cell for use by a second UE. In one aspect, the first UE 2350 is time-synchronized in the cell, and the second UE is not time-synchronized in the cell. In one respect, the available number of cyclic offsets for each root sequence in the first set of RACH parameters is greater than in the second set of parameters. In one respect, the available number of preambles for each time frequency resource associated with the first set of RACH parameters is greater than in the second set of parameters.
[00282] The receiving component 2304 can
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127/133 receive, from the first UE 2350 based on the first set of parameters, a first RACH preamble in a set of RACH resources, the first RACH preamble being associated with beam failure recovery. The receiving component 2304 can provide the first RACH preamble for the beam detection component 2306. The receiving component 2304 can receive, from the second UE based on the second set of parameters, a second RACH preamble in the set of RACH. The beam detection component 2306 can identify a beam index for communication with the first UE 2350 based on receipt of the first RACH preamble. In one aspect, the second set of parameters is sent in a handover message, an RMSI message or an OSI message. In one aspect, the first set of parameters is sent in an RRC message.
[00283] The apparatus may include additional components that execute each of the algorithm blocks in the aforementioned flowcharts of Figure 19. As such, each block in the aforementioned flowcharts of Figure 19 may be made by a component and the apparatus may include one or more more of these components. The components can be one or more hardware components specifically configured to execute the declared processes / algorithm, implemented by a processor configured to execute the declared processes / algorithm, stored in a computer-readable medium for implementation by a processor or some combination thereof .
[00284] Figure 24 is a 2400 diagram that
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128/133 illustrates an example of a hardware implementation for an apparatus 2302 'employing a 2414 processing system.
The 2414 processing system can be implemented with a bus architecture, generally represented by the 2424 bus. The 2424 bus can include any number of bus and bridge interconnection, depending on the specific application of the 2414 processing system and the general design restrictions. The 2424 bus interconnects several circuits, including one or more processors and / or hardware components, represented by the 2404 processor, the 2304, 2306, 2308, 2310 components and the 2406 computer-readable medium. The 2424 bus can also link several other circuits, such as timing sources, peripherals, voltage regulators and power management circuits, which are well known in the art and therefore will no longer be described.
[00285] The processing system 2414 can be coupled to a transceiver 2410. Transceiver 2410 is coupled to one or more antennas 2420. Transceiver 2410 provides a means to communicate with several other devices through a transmission medium. The transceiver 2410 receives a signal from one or more antennas 2420, extracts information from the received signal and provides the extracted information to the processing system 2414, specifically the receiving component 2304. In addition, the transceiver 2410 receives information from the processing system 2414 , specifically the transmission component 2310, and based on the information received, generates a signal to be applied to one or more antennas 2420. The processing system 2414 includes a processor 2404 coupled to
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129/133 a computer-readable medium / memory 2406. Processor 2404 is responsible for general processing, including running software stored in computer-readable medium / memory 2406. The software, when executed by processor 2404, causes the system to Processor 2414 performs the various functions described above for any particular device. The computer-readable medium / memory 2406 can also be used to store data that is handled by the 2404 processor when running the software. The processing system 2414 further includes at least one of the components 2304, 2306, 2308, 2310. The components may be software components running on processor 2404, resident / stored in the computer-readable medium / memory 2406, one or more components of hardware attached to the 2404 processor, or some combination thereof. Processing system 2414 may be a component of base station 310 and may include memory 376 and / or at least one TX processor 316, processor RX 370, and controller / processor 375.
[00286] In one configuration, the device 2302/2302 'for wireless communication includes means for determining a first set of parameters associated with a first RACH procedure, the first set of parameters being associated with the recovery of beam failure for a first UE in a cell provided by the device 2302/2302 '. Apparatus 2302/2302 'may include means for sending the first set of parameters to the first UE.
[00287] In one aspect, the first set of parameters indicates at least one of a sequence index
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130/133 root associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power associated with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a number maximum preamble transmission associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure.
[00288] Apparatus 2302/2302 'may include means for determining a second set of parameters associated with a second RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, re-selection of cell, lost time synchronization or delivery. Apparatus 2302/2302 'may include means for sending the second set of parameters in the cell for use by a second UE. In one aspect, the first UE is time-synchronized in the cell, and the second UE is not time-synchronized in the cell. In one aspect, the available number of cyclic offsets for each root sequence associated with the first set of RACH parameters is greater than the available number of cyclic offsets for each root sequence associated with the second set of parameters. In one respect, the available number of preambles for each time frequency resource associated with the first set of RACH parameters is greater than the available number of preambles for each time frequency resource associated with the second set of RACH parameters.
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131/133 parameters. The apparatus 2302/2302 'can include means for receiving, from the first UE based on the first set of parameters, a first RACH preamble in a set of RACH resources, the first RACH preamble being
associated with recovery failure in beam; and means for receive, according to EU based at the second set in parameters, one second preamble in RACH no set in
RACH resources. Apparatus 2302/2302 'may include means for identifying a beam index for communication with the first UE based on receipt of the first RACH preamble. In one aspect, the second set of parameters is sent in a handover message, an RMSI message or an OSI message. In one aspect, the first set of parameters is sent in an RRC message.
[00289] The aforementioned means may be one or more of the aforementioned components of the apparatus 2302 and / or the processing system 2414 of the apparatus 2302 'configured to perform the functions cited by the aforementioned means. As described above, processing system 2414 may include Processor TX 316, Processor RX 370 and controller / processor 375. As such, in one configuration, the aforementioned means may be Processor TX 316, Processor RX 370, and the controller / processor 375 configured to perform the functions cited by the aforementioned means.
[00290] The previous description is provided to allow anyone skilled in the art to practice the various aspects described here. Several changes to these aspects will be readily apparent to those skilled in
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132/133 technical, and the general principles defined here can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown here, but must be in accordance with the full scope consistent with the language claims, where the reference to an element in the singular does not mean one and only one unless specifically so stated, but one or more. The word exemplary is used here to mean serving as an example, case or illustration. Any aspect described here as exemplary should not necessarily be interpreted as preferred or advantageous over other aspects. Unless otherwise indicated, the term some refers to one or more. Combinations like at least one of
A, B or C, one or more of A, B or C, at least one of A, B and C, one or more of A, B and C and A, B, C, or any combination thereof include any combination of A, B, and / or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as at least one of A, B or C, one or more of A, B or C, at least one from A, B and C, one or more from A, B and C and A,
B, C, or any combination of them can be just A, just B, just C, A and B, A and C, B and C, or A and B and C, where any of these combinations can contain one or more members or members of A, B or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or will later be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by claims. Besides that,
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133/133 nothing disclosed here is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recited in the claims. The words module, mechanism, element, device and the like may not be a substitute for the word medium. As such, no statement element should be interpreted as a more functional means unless the element is expressly recited using the expression means for.

权利要求:
Claims (30)
[1]
1. Method of wireless communication by a base station providing a cell, the method comprising:
determining a first set of parameters associated with a first random access channel (RACH) procedure, the first set of parameters being associated with beam failure recovery for a first user equipment (UE) in the cell; and send the first set of parameters to the first UE.
[2]
A method according to claim 1, wherein the first set of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power received with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first procedure of RACH, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure.
[3]
A method according to claim 1, which further comprises:
determining a second set of parameters associated with a second RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover; and
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2/8 send the second set of parameters in the cell for use by a second UE.
[4]
A method according to claim 3, wherein the first UE is time-synchronized in the cell, and the second UE is time-synchronized in the cell.
[5]
Method according to claim 3, wherein an available number of cyclic offsets for each root sequence associated with the first set of parameters is greater than an available number of cyclic offsets for each root sequence associated with the second set of parameters .
[6]
A method according to claim 3, wherein an available number of preambles for each time frequency resource associated with the first set of parameters is greater than an available number of preambles for each time frequency resource associated with the second set of parameters.
[7]
Method according to claim 3, further comprising:
receiving, from the first UE based on the first set of parameters, a first RACH preamble in a set of RACH resources, the first RACH preamble being associated with beam failure recovery; and receiving, from the second UE based on the second set of parameters, a second RACH preamble in the set of RACH resources.
[8]
A method according to claim 7, further comprising:
identify a beam index for communication with the first UE based on the receipt of the first preamble
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3/8 RACH.
[9]
A method according to claim 3, wherein the second set of parameters is sent in a transfer message, a minimum remaining system information message (RMSI), or another system information message (OSI).
[10]
10. Method according to claim 1, in which the first set of parameters is sent in a radio resource control (RRC) message.
[11]
11. Method of wireless communication by a user equipment (UE), the method comprising:
receiving, from a base station, a first parameter set procedure associated with a first random access channel (RACH), the first RACH procedure being associated with beam failure recovery with the base station;
receive, from the base station, a second set of parameters associated with a second RACH procedure, the second RACH procedure being associated with one of initial access, cell selection, cell reselection, loss of timing synchronization, or handover ;
generate a RACH preamble based on the first set of parameters or based on the second set of parameters; and send the generated RACH preamble to the base station.
[12]
A method according to claim 11, wherein the first set of parameters indicates at least one of a root sequence index associated with the first
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4/8 RACH procedure, a configuration index associated with the first RACH procedure, a target power received with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a number of maximum preamble transmission associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure.
[13]
13. The method of claim 11, further comprising:
detecting failure of a service beam used for communication between the UE and the base station; and select the first set of parameters based on the detected service beam failure.
[14]
The method of claim 11, wherein sending the generated RACH preamble indicates at least one of a beam failure request or a second beam index corresponding to a second base station beam.
[15]
15. Method according to claim 11, in which the first set of parameters is received through radio resource control (RRC) signaling.
[16]
16. The method of claim 11, wherein the UE is time-synchronized in the cell.
[17]
17. The method of claim 11, wherein the second set of parameters is received in a transfer message, a minimum remaining system information message (RMSI), or another system information message (OSI).
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5/8
[18]
18. An apparatus configured to provide a cell, the apparatus comprising:
means for determining a first set of parameters associated with a first random access channel (RACH) procedure, the first set of parameters being associated with beam failure recovery for a first user equipment (UE) in the cell; and means for sending the first set of parameters to the first UE.
[19]
An apparatus according to claim 18, wherein the first set of parameters indicates at least one of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power received with the first RACH procedure, a number of cyclic shifts for each root sequence associated with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first procedure of RACH, candidate beam limit for the first RACH procedure and PRACH frequency deviation associated with the first RACH procedure.
[20]
An apparatus according to claim 18, further comprising:
means for determining a second set of parameters associated with a second RACH procedure, the second set of parameters being associated with at least one of initial access, cell selection, cell re-selection, loss of timing synchronization or handover; and
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6/8 means for sending the second set of parameters in the cell for use by a second UE.
[21]
An apparatus according to claim 20, wherein the first UE is time-synchronized in the cell, and the second UE is time-synchronized in the cell.
[22]
An apparatus according to claim 20, wherein an available number of cyclic offsets for each root sequence associated with the first set of RACH parameters is greater than an available number of cyclic offsets for each root sequence associated with the second set of parameters.
[23]
An apparatus according to claim 20, wherein an available number of preambles for each time frequency resource associated with the first set of RACH parameters is greater than an available number of preambles for each associated time frequency resource. with the second set of parameters.
[24]
24. The apparatus of claim 20, further comprising:
means for receiving, from the first UE based on the first set of parameters, a first RACH preamble in a set of RACH resources, the first RACH preamble being associated with beam failure recovery; and means for receiving, from the second UE based on the second set of parameters, a second RACH preamble in the set of RACH resources.
[25]
An apparatus according to claim 24, further comprising:
means to identify a beam index for the
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7/8 communication with the first EU based on receipt of the first preamble to RACH.
[26]
26. Apparatus according to claim 20, wherein the second set of parameters is sent in a handover message, a minimum remaining system information message (RMSI), or another system information message (OSI).
[27]
27. Apparatus according to claim 18, in which the first set of parameters is sent in a radio resource control (RRC) message.
[28]
28. Apparatus for wireless communication by a user equipment (UE), the apparatus comprising:
means for receiving, from a base station, a first set of parameters associated with a first procedure random access channel (RACH), the first RACH procedure being associated with beam failure recovery with the base station;
means for receiving, from the base station, a second set of parameters associated with a second RACH procedure, the second RACH procedure being associated with an initial access, cell selection, cell reselection, loss of timing synchronization, or handover;
means for generating a RACH preamble based on the first set of parameters or based on the second set of parameters; and means for sending the generated RACH preamble to the base station.
[29]
29. The apparatus of claim 28, wherein the first set of parameters indicates at least one
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8/8 of a root sequence index associated with the first RACH procedure, a configuration index associated with the first RACH procedure, a target power received with the first RACH procedure, a number of cyclic shifts for each associated root sequence with the first RACH procedure, a maximum preamble transmission number associated with the first RACH procedure, power ramp step associated with the first RACH procedure, candidate beam limit for the first RACH procedure and frequency deviation of PRACH associated with the first RACH procedure.
[30]
An apparatus according to claim 28, further comprising:
means for detecting the failure of a service beam used for communication between the UE and the base station; and means for selecting the first set of parameters based on the detected failure of the service beam.

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同族专利:

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公开号 | 公开日

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CN110089041A|2019-08-02|

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JP2020507953A|2020-03-12|

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EP3571778A1|2019-11-27|

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CN113765570A|2021-12-07|

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WO2018136300A1|2018-07-26|

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CA3047143A1|2018-07-26|

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法律状态:
2021-10-13| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

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US201762447386P| true| 2017-01-17|2017-01-17|

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US201762567161P| true| 2017-10-02|2017-10-02|

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PCT/US2018/013356|WO2018136300A1|2017-01-17|2018-01-11|System and method for beam adjustment request|

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