• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    user equipment (eu) is provided, including a wireless transceiver and a controller. the wireless transceiver performs wireless transmission and reception to and from a cellular station. the controller selects a downlink reference signal associated with a candidate beam from a plurality of downlink reference signals, including channel status information reference signal resources (csi-rs), sync signal blocks (ss ), or physical broadcast channel blocks (pbch), and determines one of several sets of preambles of the physical random access channel (prach) and split times for the downlink reference signal selected according to an association configured between the downlink reference signals and prach capabilities. in addition, the controller uses the set preamble preamble and rach occasion to perform a prach transmission to the cell station via the wireless transceiver.
    公开号:BR112019019944A2
    申请号:R112019019944
    申请日:2018-03-26
    公开日:2020-04-28
    发明作者:Yu Chia-Hao；Tsai Chiou-Wei；Gau Guo-Hau
    申请人:Mediatek Inc；
    IPC主号:
    专利说明:

    APPLIANCES AND METHODS FOR BEAM IDENTIFICATION THROUGH THE RANDOM PHYSICAL ACCESS CHANNEL (PRACH) AND EFFICIENT USE OF PRACH RESOURCES
    CROSS REFERENCE FOR RELATED ORDERS [001] This Order claims priority from US Provisional Order No. 62 / 475,966, filed on March 24, 2017, the entirety of which is incorporated by reference in this document. In addition, this Order claims priority for US Provisional Order No. 62 / 475,970, filed on March 24, 2017, the entirety of which is incorporated by reference into this document.
    FIELD OF THE INVENTION [002] The request generally relates to projects of Physical Random Access Channel (PRACH) and, more particularly, to devices and methods for identifying beams through PRACH and efficient use of PRACH resources.
    BACKGROUND OF THE INVENTION [003] The fifth generation Novo Radio (NR) technology (5G) is an improvement over the fourth generation Long Term Evolution (LTE) technology (4G), which provides extreme data speeds and capacity using larger unlicensed spectrum bands (for example, above 30 GHz, freely known as millimeter wave (mmWave)), for wireless broadband communications. Due to the huge loss of path and penetration in millimeter wavelengths, a technique called beam formation is employed, which plays an important role in the creation and maintenance of a robust communication link.
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    2/31 [004] Beaming generally requires one or more antenna arrays, each comprising a plurality of antennas. By properly defining the weights of the antennas that define the contribution of each of the antennas to a transmission or reception operation, it becomes possible to mold the sensitivity of the transmission / reception to a particularly high value in a specific direction formed by beam. By applying different antenna weights, different beam patterns can be achieved, for example, different directive beams can be used sequentially.
    [005] During a transmission operation (Tx), the beam formation can direct the signal to a receiver of interest. Likewise, during a receive (Rx) operation, beam formation can provide high sensitivity when receiving a signal originating from a sender of interest. As the transmission power can be focused anisotropically, for example, at a solid angle of interest, beam formation can provide better link budgets due to the lower Tx power required and the higher received signal power, when compared to conventional practice, which it does not employ beam formation and depends on more or less isotropic transmission.
    [006] However, the technique mentioned above faces certain challenges. For example, in a multi-beam operation, the movement of a User Equipment (UE), the angular rotation of the UE, or the terrain blocking line of sight can cause degradation of the signal quality of the active beams. In certain scenarios, signal quality can degrade quickly and there may be no time
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    3/31 enough to exchange the beams, and consequently, beam failure may occur. Therefore, it is desirable to have a mechanism to recover from the beam failure.
    [007] In addition, in the 5G NR technology, there are situations in which the PRACH preambles can be used for uplink requests when the Time Advance (TA) command and the Cellular Radio Network Temporary Identifier (C-RNTI ) temporary need not be transmitted in responses to uplink requests. Therefore, it is desirable to improve the PRACH design to adapt to these situations in a more efficient way of using PRACH resources.
    SUMMARY OF THE INVENTION [008] To solve the problems mentioned above, the present application proposes the recovery of beam failures through PRACH. Specifically, an association between downlink reference signals (such as the Channel State Information Reference Signal (CSI-RS) features, Sync Signal (SS) blocks, or Physical Broadcast Channel (PBCH) blocks ) and PRACH features (such as PRACH preambles, RACH occasions, or a combination of the above) are provided for beam identification to recover beam failures or facilitate transfers from one cell to another. In addition, this application proposes more flexible PRACH projects to improve the efficiency of the use of PRACH resources. Specifically, different preambles can be flexibly divided for asynchronous and synchronous transmissions within a PRACH frequency resource and / or bandwidth and / or offset
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    4/31 cyclic used for synchronous transmission can be reduced to be smaller than those used for asynchronous transmission.
    [009] In a first aspect of the order, a User Equipment (UE) is provided that comprises a wireless transceiver and a controller. The wireless transceiver is configured to perform wireless transmission and reception to and from a cellular station. The controller is configured to select a downlink reference signal associated with a candidate beam from a plurality of downlink reference signals comprising Channel State Information Reference (CSI-RS) features, Synchronization (SS), or Physical Broadcast Channel (PBCH), determine one of a plurality of sets of preambles of the Physical Random Access Channel (PRACH) and RACH occasions for the downlink reference signal selected according to a configured association between the downlink reference signals and the PRACH resources, and use the given set of preamble PRACH and RACH occasion to carry out a PRACH transmission to the cell station via the wireless transceiver.
    [0010] In a second aspect of the application, a method is provided for beam identification through a PRACH, performed by a UE connected wirelessly to a cellular station. The method for beam identification through a PRACH comprises the steps of: selecting a downlink reference signal associated with a candidate beam among a plurality of downlink reference signals comprising CSI-RS resources, blocks
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    5/31
    SS, or PBCH blocks; determining one of several sets of PRACH preambles and RACH occasions for the downlink reference signal selected according to an association configured between the downlink reference signals and the PRACH resources; and use the given set of preamble PRACH and RACH occasion to perform a PRACH transmission to the cell station.
    [0011] In a third aspect of the application, a cellular station is provided that comprises a wireless transceiver and a controller. The wireless transceiver is configured to perform wireless transmission and reception to and from an UE. The controller is configured to receive a PRACH transmission that uses a PRACH resource from the UE through the wireless transceiver, to determine one of a plurality of downlink reference signals comprising CSI-RS resources, SS blocks, or PBCH blocks of according to an association configured between the downlink reference signals and the PRACH resource, and to identify a candidate beam associated with the determined downlink reference signal.
    [0012] In a fourth aspect of the application, a method is provided for beam identification through a PRACH, performed by a cellular station connected wirelessly to a UE. The method for beam identification through a PRACH comprises the steps of: receiving a PRACH transmission that uses a PRACH resource from the UE; determining one of a plurality of downlink reference signals comprising CSI-RS resources, SS blocks, or PBCH blocks according to a configured association between
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    6/31 the downlink reference signals and the PRACH feature; and identifying a candidate beam associated with a given downlink reference signal.
    [0013] Other aspects and characteristics of this application will become evident to those skilled in the art after reviewing the following descriptions of specific modalities of UEs, cell stations, and methods for identifying beams using a PRACH and for the efficient use of PRACH resources.
    BRIEF DESCRIPTION OF THE DRAWINGS [0014] The application can be understood more fully by reading the subsequent detailed description and examples with references to the accompanying drawings, in which:
    Figure 1 is a block diagram of a wireless communication environment according to an order modality;
    Figure 2 is a block diagram illustrating the UE 110 according to an order embodiment;
    Figure 3 is a block diagram illustrating a cell station according to an order embodiment;
    Figure 4 is a schematic diagram that illustrates the associations between CSI-RS resources, SS / PBCH blocks, and a set of preambles for PRACH and RACH occasions according to an order modality;
    Figure 5 is a schematic diagram that illustrates the association between CSI-RS resources and a set of preamble praches and RACH occasions according to an order modality;
    Figure 6 is a schematic diagram illustrating the association between CSI-RS resources and a set of preamble praches and RACH occasions according to another
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    7/31 order mode;
    Figure 7 is a schematic diagram that illustrates the association between CSI-RS resources and a set of preamble praches and RACH occasions according to yet another modality of the order;
    Figure 8 is a schematic diagram that illustrates the association between CSI-RS resources and a set of preamble praches and RACH occasions according to yet another modality of the order;
    Figure 9 is a schematic diagram illustrating a joint PRACH project for the recovery of beam failure and other uplink requests or indications according to an order modality;
    Figure 10 is a schematic diagram that illustrates a use of PRACH resources for asynchronous and synchronous transmissions according to an order modality;
    Figure 11 is a schematic diagram illustrating the preamble bandwidths of PRACH for asynchronous and synchronous transmissions according to an order embodiment; and
    Figure 12 is a schematic diagram that illustrates a
    use of resources from PRACH to transmissions asynchronous and synchronous in wake up with another modality of order. DETAILED DESCRIPTION [0015] The description The follow is made with the goal in illustrate the Principles ge raises of order and should not to be
    taken in a limiting sense. It must be understood that the modalities can be carried out in software, hardware,
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    8/31 firmware, or any combination thereof. The terms comprises, comprising, includes and / or including, when used here, specify the presence of declared, integer resources, steps, operations, elements and / or components, but do not prevent the presence or addition of one or more other resources, integers , stages, operations, elements, components, and / or groups thereof.
    [0016] Figure 1 is a block diagram of a wireless communication environment according to an order modality. The wireless communication environment 100 includes user equipment (UE) 110 and a 5G NR 120 network, where UE 110 can initiate an access procedure
    randomized for recovery from beam transfer beam, or asc link request downstream, and can to be wirelessly connected to the 5G NR 120 Network to obtain in mobile services.[0017] The EU 110 can be a common phone, one smartphone, a computer panel Personal (PC), one notebook, or any device communication without thread that supports cellular technology (this is, technology 5G NR) used by the 5G NR 120 network. Particularly, O wireless communication device uses the technique in
    beam formation for wireless transmission and / or reception.
    [0018] The 5G NR 120 network includes a radio access network (RAN) 121 and a Main Next Generation Network (NG-CN) 122.
    [0019] RAN 121 is responsible for processing radio signals, determining radio protocols, and connecting UE 110 with NG-CN 122. In addition, RAN 121 is responsible for periodically broadcasting the minimum SI, and
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    9/31 provide the other SI by periodic broadcast or at the request of UE 110. RAN 121 may include one or more cellular stations, such as gNBs, that support high frequency bands (for example, above 24 GHz), and each gNB it can also include one or more Transmission Reception Points (TRPs), where each gNB or TRP can be referred to as a 5G cellular station. Some gNB functions can be distributed across different TRPs, while others can be centralized, leaving the flexibility and scope of specific deployments to meet the requirements of specific cases.
    [0020] NG-CN 122 generally consists of several network functions, including the Access and Mobility Function (AMF), Session Management Function (SMF), Policy Control Function (PCF), Policy Control Function ( PCF), Application Role (AF), Authentication Server Role (AUSF), User Plan Role (UPF), and User Data Management (UDM), where each network role can be implemented as an element networking on dedicated hardware, or as an instance of software running on dedicated hardware, or as a virtualized function instantiated on an appropriate platform, for example, a cloud infrastructure.
    [0021] AMF provides authentication, authorization, mobility management, etc., based on the UE. SMF is responsible for session management and allocates Internet Protocol (IP) addresses to UEs. It also selects and controls the UPF for data transfer. If a UE has multiple sessions, different SMFs can be allocated to each session to manage them individually and
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    10/31 possibly providing different functions per session. AF provides information about the flow of packets to the PCF responsible for policy control, in order to support Quality of Service (QoS). Based on the information, PCF determines policies on mobility and session management to make AMF and SMF work correctly. AUSF stores data for
    authentication of UEs, while the UDM stores data in signature of UEs. [0022] Must be understood what the 5G NR network 120 represented in the figure 1 is just for illustrative purposes and
    it is not intended to limit the scope of the request. The order can also be applied to other cellular technologies, such as a future enhancement to 5G NR technology.
    [0023] Figure 2 is a block diagram illustrating the UE 110 according to an order modality. UE 110 includes a wireless transceiver 10, a controller 20, a storage device 30, a display device 40, and an input / output (I / O) device 50.
    [0024] Wireless transceiver 10 is configured to perform wireless transmission and reception to and from RAN 121. Specifically, wireless transceiver 10 includes a Radio Frequency (RF) device 11, a baseband processing device 12 and antenna (s) 13, wherein the antenna (s) 13 may include one or more antennas for beam formation. The baseband processing device 12 is configured to perform baseband signal processing and control communications between the subscriber identity card (s) (not shown) and the RF device 11. The Processing
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    11/31 baseband 12 can contain various hardware components to perform baseband signal processing, including Analog to Digital Conversion (ADC) / Digital to Analog Conversion (DAC), gain adjustment, modulation / demodulation, encoding / decoding , and so on. The RF device 11 can receive wireless RF signals via antenna (s) 13, convert the received wireless RF signals into baseband signals, which are processed by the baseband processing device 12, or receiving baseband signals from the baseband processing device 12 and converting the received baseband signals to wireless RF signals, which are then transmitted by antenna (s) 13. The RF device 11 also it may contain several hardware devices to perform radio frequency conversion. For example, RF device 11 may include a mixer to multiply baseband signals with a carrier oscillated in the radio frequency of supported cellular technologies, where the radio frequency can be any radio frequency (for example, 30 GHz ~ 300 GHz for mmWave) used in 5G NR technology, or in another radio frequency, depending on the cellular technology in use.
    [0025] Controller 20 can be a general purpose processor, a Micro Control Unit (MCU), an application processor, a Digital Signal Processor (DSP), or the like, which includes several circuits to provide processing functions and data computing, control wireless transceiver 10 for wireless communications with RAN 121, store and retrieve data (for example, program code) to and from the
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    12/31 storage 30, send a series of frame data (for example, representing text messages, graphics, images, etc.) to the display device 40, and receive signals from the I / O device 50. In In particular, the controller 20 coordinates the aforementioned operations of the wireless transceiver 10, the storage device 30, the display device 40, and the I / O device 50 to perform the beam identification method via PRACH and the method for efficient use of PRACH.
    [0026] In another embodiment, the controller 20 can be incorporated into the baseband processing device 12, to serve as a baseband processor.
    [0027] As will be recognized by those skilled in the art, the circuits of the controller 20 will typically include transistors that are configured to control the operation of the circuits according to the functions and operations described herein. As will be more recognized, the specific structure or interconnections of the transistors will typically be determined by a compiler, such as a Record Transfer Language (RTL) compiler. RTL compilers can be operated by a processor in scripts that look a lot like assembly language code, to compile the script in a format used for the layout or manufacture of the final circuits. In fact, RTL is well known for its role and use in facilitating the electronic and digital systems design process.
    [0028] Storage device 30 is a non-transitory, machine-readable storage medium, including a memory, such as a FLASH memory or a Non-Volatile Random Access Memory (NVRAM), or a
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    13/31 magnetic storage device, such as a hard disk or magnetic tape, or an optical disk, or any combination thereof to store instructions and / or application program code, communication protocols, and / or methods for identifying bundles through PRACH and for efficient use of PRACH.
    [0029] The display device 40 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, or an Electronic Paper Display (EPD), etc., to provide a display function. Alternatively, the display device 40 may further include one or more touch sensors arranged on it or on the others to detect touches, contacts, or approaches to objects, such as fingers or pens.
    [0030] The I / O device 50 may include one or more buttons, a keyboard, a mouse, a touch pad, a video camera, a microphone, and / or a speaker, etc., to serve as an Interface Man-Machine (MMI) for interaction with users.
    [0031] It should be understood that the components described in the form of Figure 2 are for illustrative purposes only and are not intended to limit the scope of the request. For example, the UE 110 can include more components, such as a power supply, or a Global Positioning System (GPS) device, where the power supply can be a mobile / replaceable battery that supplies power to all other components UE 110, and the GPS device can provide the UE 110 location information for the use of some location-based services or applications.
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    14/31 [0032] Figure 3 is a block diagram illustrating a cellular station according to an order modality. The cell station can be a 5G cell station, such as a gNB or TRP. The cellular station includes a wireless transceiver 60, a controller 70, a storage device 80, and a wired interface 90.
    [0033] The wireless transceiver 60 is configured to perform wireless transmission and reception to and from the UE 110. Specifically, the wireless transceiver 60 includes an RF device 61, a baseband processing device 62, and antenna ( s) 63, wherein the antenna (s) 63 may include one or more beam forming antennas. The functions of the RF device 61, the baseband processing device 62, and the antenna (s) 63 are similar to those of the RF device 11, the baseband processing device 12, and the (s) antenna (s) 13, as described in the form of Figure 2, and therefore, the detailed description is not repeated here for the sake of brevity.
    [0034] The controller 70 can be a general purpose processor, an MCU, an application processor, a DSP, or the like, which includes several circuits to provide data processing and computing functions, to control the wireless transceiver 60 for wireless communications with UE 110, storing and retrieving data (eg program code) to and from storage device 80, and sending / receiving messages to / from other network entities (eg other cell stations on RAN 121 or other network entities on NG-CN 122) through wired interface 90. In particular, controller 70 coordinates the
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    15/31 operations mentioned above of the wireless transceiver 60, the storage device 80, and the wired interface 90 to perform the method for beam identification through PRACH and the method for efficient use of PRACH.
    [0035] In another embodiment, the controller 70 can be incorporated into the baseband processing device 62, to serve as a baseband processor.
    [0036] As will be recognized by those skilled in the art, controller 70 circuits will typically include transistors that are configured to control the operation of the circuits according to the functions and operations described in this document. As will be more recognized, the specific structure or interconnections of the transistors will typically be determined by a compiler, such as an RTL compiler. RTL compilers can be operated by a processor in scripts that closely resemble the assembly language code, to compile the script in a format used for the layout or fabrication of the final circuit. In fact, RTL is well known for its role and use in facilitating the electronic and digital systems design process.
    [0037] The storage device 80 can be a memory, such as a FLASH memory or an NVRAM, or a magnetic storage device, such as a hard disk or a magnetic tape, or an optical disk, or any combination thereof to store instructions and / or application code program, communication protocols and / or methods for identifying beams through PRACH and for efficient use of PRACH.
    [0038] The wired interface 90 is responsible for
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    16/31 provide wired communications with other network entities, such as other cellular stations on RAN 121, or other network entities on NG-CN 122. Wired interface 90 may include a cable modem, a Subscriber Line modem Asymmetric Digital (ADSL), a Fiber Optic Modem (FOM), and / or an Ethernet interface.
    [0039] It should be understood that the components described in the form of Figure 3 are for illustrative purposes only and are not intended to limit the scope of the request. For example, the cell station can include other functional devices, such as a display device (for example, LCD, LED or EPD screen, etc.), an I / O device (for example, button, keyboard, mouse, touch pad, video camera, microphone, speaker, etc.), and / or a power supply, etc.
    [0040] Note that, in this application, an association between the downlink reference signals and the PRACH preambles and the RACH occasions (for example, frequency-time resources) is configured to indicate the downlink reference signal. selected by the UE to the cell station when a PRACH preamble is transmitted by the UE and detected by the cell station. A RACH occasion is defined as the frequency-time resource in which a PRACH 1 message is transmitted using the PRACH preamble format configured with a single specific TX beam. In addition, the use of PRACH transmission includes new candidate beam identification to recover from beam failures or to facilitate transfer from one cell to another. When a beam failure or
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    17/31 cell is triggered, a downlink reference signal associated with a candidate beam will be selected from the set of downlink reference signals associated with all the beams, where the set of downlink reference signals includes resources CSI-RS, SS blocks, PBCH blocks, or any combination thereof. Based on the association, the PRACH preambles and the RACH occasions corresponding to the newly selected downlink reference signal (ie CSI-RS resource or SS / PBCH block) of the candidate beam can be determined, and the UE can transmit a random access preamble according to the PRACH preamble determined at the RACH occasion determined for the gNB. On the other hand, when receiving the random access preamble, gNB knows that a beam failure occurs or a cell transfer is triggered, and it knows which beam is the new candidate beam selected by the UE, when it receives the random access preamble, based on the association.
    [0041] Figure 4 is a schematic diagram illustrating the associations between CSI-RS resources, SS / PBCH blocks, and a set of preambles for PRACH and RACH occasions according to an order modality.
    [0042] In this modality, the beam width of each CSI-RS resource is substantially equal to the beam width of each SS / PBCH block and, therefore, the association between the CSI-RS resources and the PRACH preambles and the RACH occasions can be the same as the association between SS / PBCH blocks and PRACH preambles and RACH occasions. In other words, the association associates a CSI-RS resource or SS / PBCH block with a set of preamble praches and occasions
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    18/31
    RACH.
    [0043] As shown in Figure 4, the first SS / PBCH block and the first CSI-RS resource correspond to the first set of PRACH preambles and the RACH occasions according to the associations, and therefore, the bundles used for the first SS / PBCH block and the first CSI-RS feature corresponds to the beam used for the first set of preamble praches and RACH occasions.
    [0044] Likewise, the second SS / PBCH block and the second CSI-RS resource correspond to the second set of preamble praches and the RACH occasions according to the associations, and therefore the bundles used for the second block SS / PBCH and the second CSI-RS feature corresponds to the beam used for the second set of preamble praches and RACH occasions. The third block / block PBCH and the third resource of CSI-RS correspond to the third set of preambles of PRACH and RACH occasions according to the associations and, therefore, the bundles used for the third block SS / PBCH and the third CSI-RS correspond to the beam used for the third set of preamble praches and RACH occasions. The fourth SS / PBCH block and the fourth CSI-RS resource correspond to the fourth set of PRACH preambles and RACH occasions according to the associations and, therefore, the bundles used for the fourth SS / PBCH block and the fourth CSI resource -RS correspond to the beam used for the fourth set of preamble praches and RACH occasions.
    [0045] Note that, in another modality, the associations are configured between the CSI-RS resources and the PRACH preambles. For example, the first feature of
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    19/31
    CSI-RS is associated with the first set of PRACH preambles, the second feature of CSI-RS is associated with the second set of PRACH preambles, and so on. In another mode, the associations are configured between the SS / PBCH blocks and the PRACH preambles. For example, the first SS / PBCH block is associated with the first PRACH preamble (s) set, the second SS / PBCH block is associated with the second PRACH preamble (s) set, and so on. In another modality, associations are configured between CSI-RS resources and RACH occasions. For example, the first CSI-RS resource is associated with the first RACH occasion (s), the second CSI-RS resource is associated with the second RACH occasion (s), and so on. In another modality, the associations are configured between the SS / PBCH blocks and the RACH occasions. For example, the first SS / PBCH block is associated with the first RACH occasion (s), the second SS / PBCH block is associated with the second RACH occasion (s), and so on. In another modality, the associations are configured between the resources of CSI-RS and the preambles of PRACH and RACH occasions. For example, the first CSI-RS resource is associated with the first set of PRACH preambles and the first RACH occasion (s), the second CSI-RS resource is associated with the second set of PRACH preambles and the second ( s) RACH occasion (s), and so on. In another modality, the associations are configured between the SS / PBCH blocks and the PRACH preambles and the RACH occasions. For example, the first SS / PBCH block is associated with the first
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    20/31 PRACH preamble set and the first RACH occasion (s), the second SS / PBCH block is associated with the second PRACH preamble set and the second RACH occasion (s) and so on against.
    [0046] That is, for purposes not limited to the recovery of beam failures, new beam identification, and transfer, there are associations configured between (1) the CSI-RS resources and the RACH resources, including preambles, occasions (for example , frequency-time resources), or a combination thereof, (2) the SS / PBCH blocks and RACH resources including preambles, occasions (for example, frequency-time resources), or a combination of them, or (3) the resources CSI-RS and the SS / PBCH blocks and RACH resources, including preambles, occasions (for example, frequency-time resources) or a combination thereof.
    [0047] Figure 5 is a schematic diagram illustrating the association between CSI-RS resources and a set of preambles for PRACH and RACH occasions according to an order modality.
    [0048] In this modality, the beamwidth of each CSI-RS resource is narrower than the beamwidth of the downlink reference signals (for example, SS / PBCH blocks) to which the PRACH preambles and occasions RACH are configured to be associated. Specifically, the beam width of each CSIRS resource is substantially half the beam width of the downlink reference signals to which the PRACH preambles and RACH occasions are associated. That is, the association associates several (for example, two)
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    21/31
    CSI-RS to a set of preambles of PRACH and RACH occasions.
    [0049] As shown in Figure 5, the first and second CSI-RS resources correspond to the first set of PRACH preambles and the RACH occasions according to the association and, therefore, the bundles used for the first and second resources of CSI-RS correspond to the beam used for the first set of preambles of PRACH and RACH occasions. The third and fourth CSI-RS resources correspond to the second set of PRACH preambles and the RACH occasions according to the association, and therefore the bundles used for the third and fourth CSI-RS resources correspond to the bundle used for the second set of preamble praches and RACH occasions. The fifth and sixth resources of CSI-RS correspond to the third set of preambles of PRACH and the RACH occasions according to the association, and therefore the bundles used for the fifth and sixth resources of CSI-RS correspond to the bundle used for the third set of preamble praches and RACH occasions. The seventh and eighth CSI-RS resources correspond to the fourth set of PRACH preambles and the RACH occasions according to the association, and therefore the bundles used for the seventh and eighth CSI-RS resources correspond to the bundle used for the fourth set of preambles for PRACH and RACH occasions.
    [0050] In another modality, the associations are configured between the resources of CSI-RS and the preambles of PRACH. For example, the first and second CSIRS resources are associated with the first set of PRACH preambles, the third and fourth CSI-RS resources are
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    22/31 associated with the second set of preambles for PRACH, and so on. In another modality, associations are configured between CSI-RS resources and RACH occasions. For example, the first and second CSIRS resources are associated with the first occasion (s) of RACH, the third and fourth resources of CSI-RS are associated with the second occasion (s) of RACH, and so on.
    [0051] That is, for purposes not limited to the recovery of beam failures, new beam identification and transfer, there are associations configured between the
    resources of CSI-RS and the resources of RACH, including preambles, occasions (for example, resources of time- frequency) or a combination their. [0052] The advantage of this kind of Association (that is,
    the mapping of various CSI-RS resources to a set of PRACH preambles and RACH occasions) is that fewer PRACH resources are needed. The disadvantages of this type of association are that the new beam information is transmitted only partially by the first stage of a random access procedure and larger beams are used for messages in the third stage (ie, scheduling request) and in the fourth stage (ie, contention resolution) of a contention-based random access procedure. However, the transport of the new beam information can be completed through the message of the third step (that is, uplink transmission) of a contention-based random access procedure.
    [0053] Figure 6 is a schematic diagram that illustrates the association between CSI-RS resources and a
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    23/31 set of preambles of PRACH and RACH occasions according to another modality of the request.
    [0054] In this modality, the association associates the resources of CSI-RS with the sets of preambles of PRACH and the RACH occasions for the Multiplexing by Division of Code (CDM).
    [0055] As shown in Figure 6, there are at least two sets of PRACH preambles within each RACH occasion, where the preambles of the two sets of PRACH preambles can be differentiated in the code domain (i.e., preamble domain) .
    [0056] The first and second features of CSI-RS correspond to the first and second sets of preamble praches on the first RACH occasion, respectively. The third and fourth CSI-RS resources correspond to the first and second sets of preamble praches on the second RACH occasion, respectively. The fifth and sixth CSI-RS resources correspond to the first and second sets of preamble praches on the third RACH occasion, respectively. The seventh and eighth CSI-RS resources correspond to the first and second sets of preambles
    PRACH on[0057] fourth occasion RACH, respectively. Figure 7 is one diagram schematic what illustrates the association between the resources CSI-RS and an plurality of preambles in PRACH and RACH occasions in
    according to yet another modality of the request.
    [0058] In this modality, the association associates a CSI-RS resource with a set of RACH occasions by Frequency Division Multiplexing (FDM).
    [0059] As shown in Figure 7, there are two
    Petition 870190095481, of 09/24/2019, p. 44/76
    24/31 RACH occasions within each PRACH time period, where the two RACH occasions can be differentiated in the frequency domain.
    [0060] The first and second CSI-RS resources correspond to the first and second RACH occasions within the first PRACH time period, respectively. The third and fourth CSI-RS resources correspond to the first and second RACH occasions within the second PRACH time period, respectively. The fifth and sixth CSI-RS resources correspond to the first and second RACH occasions within the third PRACH time period, respectively. The seventh and eighth CSI-RS resource corresponds to the first and second RACH occasions within the fourth PRACH time period, respectively.
    [0061] Figure 8 is a schematic diagram that illustrates the association between CSI-RS resources and a plurality of PRACH preambles and RACH occasions according to yet another modality of the application.
    [0062] In this modality, the association associates a resource of CSI-RS to a set of preambles of PRACH and RACH occasions by Multiplexing by Code Division (TDM).
    [0063] As shown in Figure 8, the four RACH occasions are duplicated in the time domain, where each of the eight RACH occasions can be differentiated in the time domain with the same frequency range.
    [0064] The first and second CSI-RS resources correspond to the first RACH occasion in the first period of the time domain and the first RACH occasion in the second period of the time domain, respectively. The third and
    Petition 870190095481, of 09/24/2019, p. 45/76
    25/31 the fourth CSI-RS resources correspond to the second RACH occasion in the first time domain period and the second RACH occasion in the second time domain period, respectively. The fifth and sixth CSI-RS resource corresponds to the third RACH occasion in the first period of the time domain and the third RACH occasion in the second period of the time domain, respectively. The seventh and eighth CSI-RS feature corresponds to the fourth RACH occasion in the first period of the time domain and the fourth RACH occasion in the second period of the time domain, respectively.
    [0065] The advantages of the associations in Figures 6 to 8 are that the new beam information can be fully transmitted through the first stage of a random access procedure and narrower beams can be used for the third stage messages (that is, uplink transmission) and fourth step (for example, contention resolution) of a contention-based random access procedure (narrower beam can yield better spectral efficiency). Note that the association between downlink reference signals (ie, CSI-RS and / or SS block / PBCH resources) and a plurality of preamble sets of PRACH and / or RACH occasions can be based on any combination of CDM, FDM, TDM methods mentioned above.
    [0066] Figure 9 is a schematic diagram that illustrates a joint PRACH project for recovery of beam failure and other requests or indication of uplink according to an order modality.
    [0067] In this modality, a dedicated preamble can
    Petition 870190095481, of 09/24/2019, p. 46/76
    26/31 to be allocated for beam failure recovery and other uplink requests or indications, such as scheduling request or a confirmation signal (ACK) or non-confirmation (NACK).
    [0068] Specifically, when transmitted on one of the service bundles (indicated as Feixel in Figure 9), the dedicated preamble serves as a scheduling request or an ACK / NACK signal. When transmitted in one of the non-service beams (indicated as Beam2 to Beam4 in Figure 9), the dedicated preamble serves as a request for beam failure recovery.
    [0069] As shown in Figure 9, the preamble can serve as a scheduling request when it is transmitted in Feixel (ie, the service beam) and can serve as a request for recovery from beam failure when it is transmitted in Beam 4 (that is, a non-serving beam).
    [0070] Note that, in the present application, more flexible PRACH projects are proposed to improve the efficiency of the use of PRACH resources. For example, different preambles can be flexibly divided for asynchronous and synchronous transmissions within a RACH and / or bandwidth occasion using a preamble format with a shorter sequence length or configuring a smaller subcarrier spacing, and / or offset cyclic used for synchronous transmission can be reduced to be less than those used for asynchronous transmission.
    [0071] Figure 10 is a schematic diagram that illustrates a use of PRACH resources for
    Petition 870190095481, of 09/24/2019, p. 47/76
    27/31 asynchronous and synchronous transmissions according to an order modality.
    [0072] As shown in Figure 10, there are four different PRACH configurations for the same PRACH frequency-time resource. In the first PRACH configuration (indicated as ConFig.O in Figure 10), the preambles generated using all Zadoff-Chu (ZC) roots are for asynchronous transmissions, and the PRACH resource blocks for asynchronous transmissions using different preambles are denoted as Async.Bl to Async.B4.
    [0073] In the other PRACH configurations (indicated as ConFig.la ConFig.3 in Figure 10), the preambles generated using all ZC roots are divided for asynchronous and synchronous transmissions within the same PRACH frequency-time resource, and the blocks PRACH features for asynchronous transmissions using different preambles are indicated as Async.B5 for Async.B6, while the PRACH feature blocks synchronous transmissions using different preambles are indicated as Sync.BI through Sync .B2.
    [0074] An example of the preambles and the number of ZC roots used for asynchronous and synchronous transmissions in each PRACH configuration is given in table 1 as follows (assuming the spacing between PRACH carriers (SCS) is 30 KHz and the distance between locations (ISD) is 500 meters).
    Configuration# # of ZC roots for Tx Subscribe. # of preambles for Tx Subscribe.(upper limit) # of ZC roots for Synx Tx. # of preambles for Synx.(upper limit) 0 6 60 0 0
    Petition 870190095481, of 09/24/2019, p. 48/76
    28/31
    1 5 50 1 33 2 4 40 2 66 3 3 30 3 99
    Table 1.
    [0075] For synchronous uplink PRACH attempts or PRACH attempts that are not followed by Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) transmissions, gNB does not need to include the Forward command Timing (TA) and the Temporary Cellular Radio Network Identifier (C-RNTI) in response to these PRACH attempts.
    [0076] Figure 11 is a schematic diagram that illustrates the preamble bandwidths of PRACH for asynchronous and synchronous transmissions according to an order modality.
    [0077] The PRACH frequency-time feature used for asynchronous transmissions is shown on the left side of Figure 11, in which the number of ZC roots is 8 and the length of the preamble strings is 839. The PRACH frequency-time feature used for synchronous transmissions (where the TA estimate is not required) is shown on the right side of Figure 11, in which the number of ZC roots is 2 and the length of the preamble strings is 139. That is, the preamble bandwidth PRACH for synchronous transmission is narrower than the preamble bandwidth of PRACH for asynchronous transmission. In other words, the PRACH bandwidth can be reduced by configuring a preamble format with a smaller string size or configuring a spacing
    Petition 870190095481, of 09/24/2019, p. 49/76
    29/31 minor subcarrier.
    [0078] Due to the fact that the preamble sequence is reduced and the number of ZC roots in the PRACH temp frequency resource for synchronous transmissions is reduced, the Multiple Access Interference (MAI) of other root sequences can be reduced.
    [0079] In addition, as the TA estimate is not required for synchronous PRACH transmissions, the cyclic offset does not need to cover the round-trip propagation delay, and the cyclic offset applied to generate the preambles can be reduced.
    [0080] Alternatively, the PRACH preamble bandwidth and the cyclic offset used for synchronous transmission can be reduced to be less than those used for asynchronous transmission.
    [0081] Figure 12 is a schematic diagram that illustrates a use of PRACH resources for asynchronous and synchronous transmissions according to another order modality.
    [0082] The PRACH frequency-time feature for asynchronous transmissions is shown on the left side of Figure 12, where the number of ZC roots is 8, the length of the preamble sequences is 839 and the cyclic offset is 9. The features of PRACH frequency-time for synchronous transmissions are shown on the right side of Figure 12, where the number of ZC roots is 2, the length of the preamble sequences is 139, and the cyclic offset is 2.
    [0083] As shown in Figure 12, there may be several PRACH frequency-time resources for transmissions
    Petition 870190095481, of 09/24/2019, p. 50/76
    30/31 synchronous allocated within the same PRACH time period. Advantageously, this allocation can reach the target preamble opportunities without introducing severe MAI from other root sequences.
    [0084] In view of the previous modalities, it will be recognized that the present application performs recovery from beam failure or beam transfer through PRACH, providing an association between the downlink reference signals (for example, CSI-RS resources and / or SS / PBCH blocks) and PRACH resources (including PRACH preamble sets, RACH occasions or any combination thereof) for beam identification. In addition, the present application performs more flexible PRACH designs, allowing different preambles to be divided flexibly for asynchronous and synchronous transmissions within a PRACH frequency-time resource, and / or reducing the bandwidth and / or cyclic displacement used for synchronous transmission less than those used for asynchronous transmission. Advantageously, the spectral efficiency and the efficiency of using PRACH can be significantly improved.
    [0085] Although the application has been described by way of example and in terms of the preferred modality, it should be understood that the application is not limited to them. Subject matter technicians can still make a number of changes and modifications without departing from the scope and spirit of this request. Therefore, the scope of this application must be defined and protected by the following claims and their equivalents.
    [0086] The use of ordinal terms, as first,
    Petition 870190095481, of 09/24/2019, p. 51/76
    31/31 seconds etc. in claims to modify a claim element by itself does not connote any priority, precedence, or order of one claim element over another or the temporal order in which it acts on an executed method, but are used only as labels to distinguish an element from claim with a given name from another element with the same name (but for use of the term ordinal) to distinguish the claim elements.
    权利要求:
    Claims (23)
    [1]
    1. User equipment (UE), characterized by the fact that it comprises:
    a wireless transceiver, configured to perform wireless transmission and reception to and from a cellular station; and a controller, configured to select a downlink reference signal associated with a candidate beam from a plurality of downlink reference signals comprising Channel State Information Reference (CSI-RS) features, Signal blocks. Synchronization (SS) or Physical Diffusion Channel (PBCH) blocks, determine one from a plurality of sets of Physical Random Access Channel (PRACH) preambles and RACH occasions for the downlink reference signal selected accordingly with a configured association between the downlink reference signals and the PRACH resources, and use the given set of preamble PRACH and RACH occasion to carry out a PRACH transmission to the cell station via the wireless transceiver.
    [2]
    2. UE according to claim 1, characterized by the fact that the candidate beam is used for recovery from beam failure or for a transfer from one cell to another cell.
    [3]
    3. UE, according to claim 1, characterized by the fact that the PRACH resources comprise the PRACH preambles, the RACH occasions, or a combination thereof, and the association is configured between the downlink reference signals and the preambles of PRACH,
    Petition 870190095481, of 09/24/2019, p. 53/76
    2/7 the RACH occasions, or a combination of them.
    [4]
    4. UE, according to claim 1, characterized by the fact that, when the PRACH transmission comprises transmitting a first PRACH preamble using a first RACH occasion which corresponds to the selected downlink reference signal, the first PRACH preamble it is used for a purpose; and when the PRACH transmission comprises transmitting the first PRACH preamble using a second RACH occasion which corresponds to another downlink reference signal, the first PRACH preamble is used for another purpose.
    [5]
    5. UE, according to claim 4, characterized by the fact that, when the first preamble of PRACH is transmitted in a service beam, the first preamble of PRACH serves as a scheduling request or a confirmation signal (ACK) or non-acknowledgment (NACK), and when the first PRACH preamble is transmitted in the candidate beam, the first PRACH preamble serves as a beam failure recovery request.
    [6]
    6. UE, according to claim 1, characterized by the fact that the association configured between the downlink reference signals and the PRACH resources associates a CSI-RS resource, SS block, or PBCH block with a set of PRACH resource, or associates multiple CSI-RS resources, SS blocks, or PBCH blocks with a set of PRACH resources.
    [7]
    7. UE, according to claim 6, characterized by the fact that, when the association configured between the downlink reference signals and the
    Petition 870190095481, of 09/24/2019, p. 54/76
    3/7
    PRACH associates several CSI-RS resources, SS blocks or PBCH blocks with a set of PRACH resources, the controller is further configured to transmit an uplink transmission to the cellular station through the wireless transceiver to identify which of the various communication resources. CSI-RS, SS blocks, or PBCH blocks are associated with the candidate beam.
    [8]
    8. UE, according to claim 6, characterized by the fact that the association configured between the downlink reference signals and the PRACH resources associates a CSI-RS resource, SS block or PBCH block with a set of resources of PRACH, for at least one of the following: Code Division Multiplexing (CDM), Frequency Division Multiplexing (FDM), and Time Division Multiplexing (TDM).
    [9]
    9. Method for beam identification using a PRACH, performed by a UE connected wirelessly to a cellular station, the method characterized by the fact that it comprises:
    selecting a downlink reference signal associated with a candidate beam from a plurality of downlink reference signals comprising CSI-RS resources, SS blocks, or PBCH blocks;
    determining one from a plurality of sets of PRACH preambles and RACH occasions for the selected downlink reference signal according to an association configured between the downlink reference signals and the PRACH resources; and use the given set of preamble prach and
    Petition 870190095481, of 09/24/2019, p. 55/76
    4 / Ί RACH occasion to perform a PRACH transmission to the cell station.
    [10]
    10. Method according to claim 9, characterized by the fact that the candidate beam is used for recovery from beam failure or for a transfer from one cell to another cell.
    [11]
    11. Method, according to claim 9, characterized by the fact that the PRACH resources comprise the PRACH preambles, the RACH occasions, or a combination of them, and the association is configured
    between the signs of reference of link descendant and the preambles of PRACH , at occasions RACH, or a combination of the same. 12. Method, in according to claim 9, characterized by fact that, When the transmission in
    PRACH comprises transmitting a first PRACH preamble using a first RACH occasion which corresponds to the selected downlink reference signal, the first PRACH preamble is used for a purpose; and when the PRACH transmission comprises transmitting the first PRACH preamble using a second RACH occasion which corresponds to another downlink reference signal, the first PRACH preamble is used for another purpose.
    [12]
    13. Method according to claim 12, characterized by the fact that when the first preamble of PRACH is transmitted in a service beam, the first preamble of PRACH serves as a scheduling request or an ACK or NACK signal, and when the first preamble of PRACH is transmitted in the candidate beam, the
    Petition 870190095481, of 09/24/2019, p. 56/76
    5/7 first preamble of PRACH serves as a beam failure recovery request.
    [13]
    14. Method, according to claim 9, characterized by the fact that the association configured between the downlink reference signals and the PRACH resources associates a CSI-RS resource, SS block, or PBCH block with a set of PRACH resource, or associates multiple CSI-RS resources, SS blocks, or PBCH blocks with a set of PRACH resources.
    [14]
    15. Method, according to claim 14, characterized by the fact that it further comprises:
    when the configured association between the downlink reference signals and the PRACH resources associates multiple CSI-RS resources, SS blocks or PBCH blocks with a set of PRACH resources, transmitting an uplink transmission to the cellular station to identify which of the various CSI-RS resources, SS blocks, or PBCH blocks is associated with the candidate beam.
    [15]
    16. Method, according to claim 9, characterized by the fact that the association configured between the downlink reference signals and the PRACH resources associates a CSI-RS resource, SS block, or PBCH block with a set of PRACH resources, by at least one among: CDM, FDM, and TDM.
    [16]
    17. Cellular station, characterized by the fact that it comprises:
    a wireless transceiver, configured to perform wireless transmission and reception to and from a UE; and a controller, configured to receive a PRACH broadcast that uses a PRACH resource at
    Petition 870190095481, of 09/24/2019, p. 57/76
    6 / Ί from the UE through the wireless transceiver, determine one of a plurality of downlink reference signals comprising CSI-RS resources, SS blocks, or PBCH blocks according to a configured association between the link reference signals downward path and the PRACH feature, and to identify a candidate beam associated with a given downlink reference signal.
    [17]
    18. Cellular station according to claim 17, characterized by the fact that the candidate beam is identified for recovery from beam failure, or for a transfer from one cell to another cell.
    [18]
    19. Cell station, according to claim 17, characterized by the fact that the PRACH transmission comprises a PRACH preamble transmitted on a RACH occasion, and the association is configured between the downlink reference signals and the PRACH preamble , the RACH occasion or a combination thereof.
    [19]
    20. Cellular station, according to claim 17, characterized by the fact that the association configured between the downlink reference signals and the PRACH resource associates a CSI-RS resource, SS block, or PBCH block with a set of PRACH resources, or associate multiple CSI-RS resources, SS blocks, or PBCH blocks with a set of PRACH resources.
    [20]
    21. Method for beam identification through a PRACH, performed by a cellular station connected wirelessly to a UE, the method characterized by the fact that it comprises:
    receive a PRACH stream that uses a PRACH resource from the UE;
    Petition 870190095481, of 09/24/2019, p. 58/76
    7/7 determining one of a plurality of downlink reference signals comprising CSI-RS resources, SS blocks, or PBCH blocks according to an association configured between the downlink reference signals and the PRACH resource; and identifying a candidate beam associated with the determined downlink reference signal.
    [21]
    22. Method according to claim 21, characterized by the fact that the candidate beam is identified for recovery from beam failure, or for a transfer from one cell to another cell.
    [22]
    23. Method, according to claim 21, characterized by the fact that the PRACH transmission comprises a PRACH preamble transmitted on a RACH occasion, and the association is configured between the downlink reference signals and the PRACH preamble, the RACH occasion or a combination thereof.
    [23]
    24. Method, according to claim 21, characterized by the fact that the association configured between the downlink reference signals and the PRACH resource associates a CSI-RS resource, SS block, or PBCH block with a set of PRACH resources, or associate multiple CSI-RS resources, SS blocks, or PBCH blocks with a set of PRACH resources.
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    法律状态:
    2021-10-19| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    US201762475970P| true| 2017-03-24|2017-03-24|
    US201762475966P| true| 2017-03-24|2017-03-24|
    PCT/CN2018/080523|WO2018171802A1|2017-03-24|2018-03-26|Apparatuses and methods for beam identification through the physical random access channeland efficient prach resource utilization|
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