radio link monitoring and configuration and operation of beam failure recovery features

专利摘要:
Certain aspects of this description provide the techniques for radio link monitoring (rlm), beam failure detection, and beam failure recovery (bfr) utilizing the radio link monitoring reference signal (rml-rs) capabilities ) and beam failure recovery reference signal (bfr-rs) capabilities. an illustrative method by a user equipment (ue) may include obtaining a first configuration indicating one or more radio link monitoring reference signal resources (rlm-rs) and one or more fault recovery reference signal resources beam (bfr-rs), where each rlm-rs resource corresponds to at least one first link, and each bfr-rs resource corresponds to at least one second link, get a first indication that a first link quality for the first link is below a first threshold and a second link quality for the second link is above a second threshold, and take action for a radio link failure (rlf) based on the indication.
公开号:BR112020004671A2
申请号:R112020004671-0
申请日:2018-09-10
公开日:2020-09-15
发明作者:Sumeeth Nagaraja；Tao Luo
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

[001] [001] This application claims priority from US Application No. 16/125,140, filed September 7, 2018, which claims the benefits of US Interim Application No. 62/557,002, filed September 11, 2017, which is assigned to the assignee of the present application and expressly incorporated herein by reference in its entirety. FUNDAMENTALS DESCRIPTION FIELD
[002] [002] Aspects of the present description relate to wireless communications systems and, more particularly, to techniques for radio link monitoring (RLM), beam failure detection, and beam failure recovery (BFR) using radio link monitoring reference signal (RLM-RS) capabilities and beam failure recovery reference signal (BFR-RS) capabilities. DESCRIPTION OF RELATED TECHNIQUE
[003] [003] Wireless communication systems are widely developed to provide various telecommunication services, such as telephony, video, data, messaging and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth, transmission power). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, division multiple access systems frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronized code division multiple access (TD-SCDMA) systems.
[004] [004] In some examples, a wireless multiple access communication system may include multiple base stations, each simultaneously supporting communication to multiple communication devices, otherwise known as user equipment (UEs). In the LTE or LTE-A network, a set of one or more base stations can define an eNodeB (eNB). In other examples (e.g. on a next generation or 5G network), a wireless multiple access communication system may include multiple distributed units (DUs) (e.g. edge units (EUs), edge nodes ( ENs), radio heads (RHs), smart radio heads (SRHs), transmit receive points (TRPs), etc.) in communication with multiple central units (CUs) (e.g. central nodes (CNs), node controllers (ANCs), etc.), where a set of one or more distributed units, in communication with a central unit, can define an access node (e.g., a new radio base station (NR BS), a node B of new radio (NR NB), a network node, 5G NB, gNB, gNodeB, etc.). A base station or DU can communicate with a set of UEs on downlink channels (e.g. for transmissions from a base station or to a UE) and uplink channels (e.g. for transmissions from a UE to a base station or unit distributed).
[005] [005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that allows different wireless devices to communicate on a municipal, national, regional and even global level. An example of an emerging telecommunication standard is new radio (NR), for example 5G radio access. NR is a set of enhancements to the LTE mobile standard enacted by the 3a Partnership Project. Generation (3GPP). It is designed to improve support for mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) downlink (DL) and uplink (UL), plus support for beamforming, multiple-input, multiple-output (MIMO) antenna technology, and carrier aggregation.
[006] [006] However, as the demand for mobile broadband access continues to increase, there is a need to create further improvements in NR technology. Preferably, these improvements should be applicable to other multiple access technologies and to the telecommunication standards that employ those technologies. BRIEF SUMMARY
[007] [007] The systems, methods and devices of the description each have several aspects, none of which alone is responsible for the desirable attributes. Without limiting the scope of this description as expressed by the claims that follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled "Detailed Description", you will understand how the features of this description provide advantages that include improved communications between access points and stations in a wireless network.
[008] [008] Certain aspects of the present description generally refer to methods and apparatus for determining when a UE is in an area in which a coverage mismatch exists between the UE's Radio Link Monitoring (RLM) reference signal resources. -RS) and UE Beam Failure Recovery Reference Signal (BFR-RS) capabilities. The UE and its serving BS may take one or more actions based on the determination of a coverage mismatch for the UE.
[009] [009] Certain aspects of this description provide a method for wireless communication that can be performed, for example, by a user equipment (UE). The method generally includes obtaining a first configuration that indicates one or more radio link monitoring reference signal (RLM-RS) resources and one or more beam failure recovery reference signal (BFR-RS) resources, where each RLM-RS resource corresponds to at least one first link, and each BFR-RS resource corresponds to at least one second link, obtaining a first indication that a first link quality for the first link is below a first threshold, and a second link quality for the second link is above a second threshold, and taking action with reference to a radio link failure (RLF) based on the indication.
[0010] [0010] Certain aspects of the present description provide a method for wireless communication that can be performed, for example, by a base station (BS). The method generally includes providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more recovery reference signal resources. beam failure (BFR-RS), where each RLM-RS resource corresponds to at least one first link, and each BFR-RS resource corresponds to at least one second link, obtaining from the UE, a report that indicates that a first link quality for the first link is below a first threshold, a second link quality for the second link is above a second threshold, and the BFR-RS resource matches the second link, and providing a second configuration for the UE, where the second configuration includes the BFR-RS resource indicated in the report as an RLM-RS resource.
[0011] [0011] Certain aspects of the present description provide a method for wireless communication that can be performed, for example, by a UE. The method generally includes obtaining a configuration indicating that one or more radio link monitoring reference signal (RLM-RS) resources and one or more beam failure recovery reference signal (BFR-RS) resources, transmit a beam failure recovery request through at least one first resource, and take action regarding a radio link failure (RLF), when the first resource is not included in one or more RLM-RS resources, or when the UE receives a response to the beam failure recovery request.
[0012] [0012] Certain aspects of the present description provide a method for wireless communication that can be performed, for example, by a base station (BS). The method generally includes providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more recovery reference signal resources. beam failure (BFR-RS), receive a beam failure recovery request from the UE through a first resource included in one or more BFR-RS resources, and provide a second configuration to the UE, where the second configuration includes the first resource as an RLM-RS resource.
[0013] [0013] Aspects include methods, apparatus, systems, computer readable media, and processing systems, as substantially described herein with reference to and as illustrated by the accompanying drawings.
[0014] [0014] In order to carry out the above and related purposes, the one or more aspects comprise the features hereinafter fully described and particularly highlighted in the claims. The following description and the accompanying drawings set forth in detail certain features illustrative of one or more aspects. These characteristics are indicative, however, of only a few of the many ways in which the principles of the various aspects can be employed, and this description should include all said aspects and their equivalences. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] [0015] In order that the manner in which the above-mentioned features of the present description can be understood in detail, a more particular description, briefly summarized above, can be obtained by referring to the aspects, some of which are illustrated in the attached drawings. It should be noted, however, that the attached drawings only illustrate certain typical aspects of this description and, therefore, should not be considered as limiting its scope, as the description may admit other equally effective aspects.
[0016] [0016] Figure 1 is a block diagram conceptually illustrating an illustrative telecommunications system in accordance with certain aspects of the present description;
[0017] [0017] Figure 2 is a block diagram illustrating an illustrative logical architecture of a distributed RAN, in accordance with certain aspects of the present description;
[0018] [0018] Figure 3 is a diagram illustrating an illustrative physical architecture of a distributed RAN, in accordance with certain aspects of the present description;
[0019] [0019] Figure 4 is a block diagram conceptually illustrating a design of an illustrative BS and UE, in accordance with certain aspects of the present description;
[0020] [0020] Figure 5 is a diagram illustrating examples for implementing a communication protocol stack, in accordance with certain aspects of the present description;
[0021] [0021] Figure 6 illustrates an example of a subframe centered on DL, in accordance with certain aspects of the present description;
[0022] [0022] Figure 7 illustrates an example of a UL-centric subframe, in accordance with certain aspects of the present description;
[0023] [0023] Figure 8 illustrates an example of CSS and USS, according to certain aspects of the present description;
[0024] [0024] Figure 9 illustrates an illustrative timeline for detecting physical layer problems, in accordance with aspects of the present description;
[0025] [0025] Fig. 10 illustrates an illustrative timeline for recovery from physical layer problems, in accordance with aspects of the present disclosure;
[0026] [0026] Figure 11 illustrates illustrative operations performed by a UE, in accordance with certain aspects of the present description;
[0027] [0027] Figure 12 illustrates illustrative operations performed by a BS, in accordance with certain aspects of the present description;
[0028] [0028] Figure 13 illustrates illustrative operations performed by a UE, in accordance with certain aspects of the present description;
[0029] [0029] Figure 14 illustrates illustrative operations performed by a BS, in accordance with certain aspects of the present description.
[0030] [0030] For ease of understanding, identical numerical references have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements described in one aspect may be beneficially used in other aspects without specific mention. DETAILED DESCRIPTION
[0031] [0031] Aspects of this description provide techniques and apparatus for radio link monitoring (RLM), beam failure detection, and beam failure recovery (BFR) utilizing radio link monitoring (RLM) reference signal capabilities -RS) and Beam Failure Recovery Reference Signal (BFR-RS) capabilities.
[0032] [0032] In wireless communication systems that employ beams, such as millimeter wave (mmW) systems, high path loss can present a challenge. Accordingly, techniques including hybrid beamforming (analog and digital), which are not present in 3G and 4G systems, can be used in mmW systems. Hybrid beamforming creates narrow beam patterns for users (eg UEs), which can improve link/SNR budget.
[0033] [0033] In communication systems employing beams, a BS and a UE can communicate through active beams. Active beams may be referred to as server beams, reference beams, or quasi-collocation (QCL) beams. In other words, according to an example, active bundles, server bundles,
[0034] [0034] Two antenna ports are considered to be of nearly the same location if the properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on the other antenna port is carried. transported. QCL supports beam management functionality including determining/estimating spatial parameters, timing/frequency deviation estimating functionality including determining/estimating Doppler/delay parameters, and radio resource management (RRM) functionality including determining/ estimate the average gain. A network (e.g. BS) may indicate to a UE that the UE's data and/or control channel may be transmitted in the direction of a transmitted reference signal. The UE may measure the reference signal to determine data characteristics and/or control channel.
[0035] [0035] According to an example, the BS can configure a UE with four beams, each associated with a different direction and different beam identification. The BS may indicate to the UE a switch from a current active beam to one of the four configured beams. Following a beam switching command, both the UE and the BS can switch to a particular beam. When a reference beam is QCL for data or control beams, the UE measurements associated with a reference signal transmitted in a reference beam apply to the data or control channel, respectively. In this way, the performance of the data or control channel can be measured using reference beams of nearly equal location.
[0036] [0036] Active beams may include BS and UE beam pairs that carry data and control channels, such as physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH), physical uplink shared channel (PUSCH), and the physical uplink control channel (PUCCH). As will be described in more detail here with reference to Figure 8, a BS (e.g. gNB) can broadcast cell-specific broadcast signals including, for example, NR (sync) sync (NR-SS) and PDCCH signals in a common search space (PDCCH-CSS) using wider beams. The BS can transmit UE-specific signals including, for example, PDCCH in a user-specific search space (PDCCH-USS) using narrower beams. UE-specific signals can be transmitted using unicast transmissions. In general, unidiffusion beams can have better coverage than diffusion beams due to beam management and refinement procedures. Since certain information can be transmitted using CSS, and not using USS, a problem can arise when a UE is in the coverage area of a USS and not in the coverage area of the CSS. Aspects of the present disclosure provide methods and apparatus for identifying or determining a coverage mismatch and actions to be taken in response to the determined mismatch.
[0037] [0037] The detailed description presented below with respect to the attached drawings should serve as a description of the various configurations and should not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a complete understanding of the various aspects. 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 illustrated in block diagram form in order to avoid obscuring such concepts.
[0038] [0038] Various aspects of telecommunication systems will now be presented with reference to the various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the attached drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software/firmware or combinations thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the system as a whole.
[0039] [0039] By way of example, an element, or any part of an element, or any combination of elements can be implemented with a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate assemblies (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware. configured to perform the various functionality described throughout this description. One or more processors in the processing system may run the software. Software shall be taken broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable elements, execution sequences, procedures, functions, etc., whether referred to as software/firmware, middleware, microcode, hardware description language, or otherwise.
[0040] [0040] Accordingly, in one or more illustrative embodiments, the functions described may be implemented in hardware, software/firmware, or combinations thereof. If implemented in software, functions can be stored in or encoded as one or more instructions or code on a computer-readable medium. Computer readable medium includes computer storage medium. The storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer readable medium may comprise RAM, ROM, EEPROM, CD-ROM, other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to port or store desired program code in the form of instructions or data structures that can be accessed by a computer. Floppy disk and disk, as used herein, include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Blu-ray disk, where floppy disks typically reproduce the data magnetically, while discs reproduce the data optically. with lasers. Combinations of the above must also be included in the scope of computer readable media.
[0041] [0041] Aspects of the present description provide apparatus, methods, processing systems and computer readable media for new radio (NR) (new radio access technology or 5G technology). NR can support various wireless communication services, such as Enhanced Mobile Broadband (eMMB) services that target high bandwidth (e.g. 80 MHz or greater), millimeter wave (mmW) services that target targeting high carrier frequency (e.g., 27 GHz or more), massive machine-type communications (mMTC) services that target non-retroactively compatible machine-type communications (MTC) techniques, and/or mission-critical services that target ultra reliable low latency communications (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to match the respective quality of service (QoS) requirements. Additionally,
[0042] [0042] The techniques described here can be used for various wireless communication networks, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Broadband CDMA (WCDMA) and other variations of CDMA. Cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as the Global System for Mobile Communications (GSM). An OFDMA network can implement a radio technology such as NR (e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX) , IEEE
[0043] [0043] Figure 1 illustrates an illustrative wireless network 100 in which aspects of the present description may be implemented. For example, the wireless network could be a new radio (NR) network or 5G network.
[0044] [0044] As will be described in more detail here, in communication systems employing beams (e.g. beam-formed communications), a UE may receive some information transmitted by a BS in a common search space (CSS) and some information transmitted by the BS in a user-specific search space (USS). As will be described in more detail with reference to Fig. 8, in certain situations, the UE may receive signals transmitted on the USS and not receive signals transmitted on the CSS. In such a lack of coverage match between CSS and USS, the UE may not receive certain information that can be transmitted through the CSS (and not through the USS). Aspects of the present description provide methods for identifying a coverage mismatch and actions to be taken by the UE and/or BS in the event of an identified coverage mismatch.
[0045] [0045] According to another example, a UE may experience a coverage mismatch between an NR-SS/PBCH transmission and the USS. Similar to the example described above regarding the lack of coverage match between CSS and USS, the UE may receive certain information transmitted through the USS and may not receive NR-SS/PBCH. Aspects of the present description provide methods for identifying such coverage mismatch and actions to be taken by the UE and/or BS in the event of a coverage mismatch between NR-SS/PBCH and USS.
[0046] [0046] UEs 120 can be configured to perform the operations 1000 and other methods described here and discussed in greater detail below regarding the lack of USS and CSS coverage matching. BS 110 may comprise a transmit receive point (TRP), Node B (NB), gNB, access point (AP), new radio BS (NR), gNodeB, 5GNB, etc.). The NR 100 network can include the central unit. The BS 110 can carry out operations complementary to the operations 1000 performed by the UE. The BS 110 can perform the operations 900 and other methods described here regarding a lack of coverage combination of the USS and CSS of the UE.
[0047] [0047] As illustrated in Figure 1, the wireless network 100 may include multiple BSs 110 and other network entities. A BS can be a station that communicates with UEs. Each BS 110 can provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to a Node B coverage area and/or a Node B subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the term "cell" and gNB, Node B, 5G NB, AP, NR BS or TRP may be interchangeable. In some examples, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station. In some examples, base stations may be interconnected to each other and/or to one or more other base stations or network nodes (not shown) in wireless network 100 through various types of return access channel interfaces, such as as a direct physical connection, a virtual network, or the like, using any suitable transport network.
[0048] [0048] In general, any number of wireless networks can be developed in a given geographic area. Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, etc. A frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between the wireless networks of different RATs. In some cases, NR or 5G RAT networks can be developed.
[0049] [0049] A BS can provide communication coverage for a macro cell, pico cell, femto cell, and/or other cell types. A macro cell can cover a relatively large geographic area (eg, several kilometers in radius) and can allow unrestricted access by UEs with a service subscription. A pico cell can cover a relatively small geographic area and can allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a household) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in the Closed Subscriber Group (CSG), UEs for users in the home , etc.). A BS for a cell macro can be referred to as a BS macro. A BS for a cell peak may be referred to as a BS peak. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example illustrated in Figure 1, BSs 110a, 110b and 110c may be macro BSs for macro cells 102a, 102b and 102c, respectively. The 110x BS can be a BS peak for a 102x cell peak. The 110y and 110z BSs can be femto BSs for the 102y and 102z femto cells, respectively. A BS can support one or several cells (eg three).
[0050] [0050] Wireless network 100 may also include relay stations. A relay station is a station that receives a data transmission and/or other information from an upstream station (e.g. a BS or a UE) and sends a data transmission and/or other information to a downstream station. (e.g. a UE or a BS). A relay station can also be a UE that relays transmissions to other UEs. In the example illustrated in Fig. 1, a relay station 110r may communicate with a BS 110a and a UE 120r in order to facilitate communication between the BS 110a and the UE 120r. A relay station may also be referred to as a BS relay, a relay, etc.
[0051] [0051] Wireless network 100 can be a heterogeneous network that includes BSs of different types, e.g. macro BS, pico BS, femto BS, relays, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference on the wireless network 100. For example, macro BS may have a high transmit power level (e.g. 20 Watts ), while pico BS, femto BS and relays may have a lower level of transmit power (eg 1 Watt).
[0052] [0052] Wireless network 100 can support synchronous or asynchronous operation. For synchronized operation, BSs can have similar frame timing, and transmissions from different BSs can be approximately time aligned. For asynchronous operation, BSs may have different frame timings, and transmissions from different BSs may not be time aligned. The techniques described here can be used for both synchronous and asynchronous operation.
[0053] [0053] A network controller 130 can couple to a set of BSs and provide coordination and control for those BSs. Network controller 130 may communicate with BSs 110 via a return access channel. The BSs 110 can also communicate with each other, for example, directly or indirectly, through the wired or wireless return access channel.
[0054] [0054] The UEs 120 (eg, 120x, 120y, etc.) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cell phone, a smartphone, a personal digital assistant (PDA). ), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local circuit station (WLL), a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smartwatch, smart clothing, smart glasses, a smart bracelet, a piece of smart jewelry (e.g. a smart ring, a smart bracelet, etc.), a vehicle component or sensor, a smart meter/sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device that already configured to communicate over a wireless or wired medium. Some UEs can be considered evolved or machine-type communication devices (MTC) or evolved MTC devices (eMTC). MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, displays, location tags, etc., that can communicate with a BS, another device (e.g., remote device), or some other entity. A wireless node can, for example, provide connectivity to or with a network (for example, a wide area network such as the Internet or a cellular network) over a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices.
[0055] [0055] In figure 1, a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE in downlink and/or uplink. A dashed line with double arrows indicates jamming transmissions between a UE and a BS.
[0056] [0056] Certain wireless networks (eg LTE) utilize orthogonal frequency division multiplexing (OFDM) in downlink and single bearer frequency division multiplexing (SC-FDM) in uplink. OFDM and SC-FDM divide the system bandwidth into multiple orthogonal (K) subcarriers, which are also commonly referred to as tones, slots, etc. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the bandwidth of the system. For example, the subcarrier spacing can be 15 kHz and the minimum resource allocation (called a "resource block") can be 12 subcarriers (or 180 kHz). Consequently, the nominal FFT size can be equal to 128, 256, 512, 1024, or 2048 for the system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), respectively. System bandwidth can also be divided into sub-bands. For example, a subband may cover 1.08 MHz (that is, 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth 1.25, 2 .5, 5, 10 or 20 MHz, respectively.
[0057] [0057] While aspects of the examples described here may be associated with LTE technologies, aspects of the present description may be applicable to other wireless communications systems, such as NR.
[0058] [0058] NR can use OFDM with a CP in uplink and downlink and include support for half duplex operation using TDD. A single component carrier bandwidth of 100 MHz can be supported. NR resource blocks can span 12 subcarriers with a subcarrier bandwidth of 75 kHz for a duration of 0.1 ms. In one aspect, each radio frame may consist of 50 subframes with a length of 10 ms. Consequently, each subframe can have a length of 0.2 ms. In another aspect, each radio frame can consist of 10 subframes with a length of 10 ms, where each subframe can be a length of 1 ms. Each subframe can indicate a link direction (ie DL or UL) for data transmission and the link direction for each subframe can be dynamically switched. Each subframe can include DL/UL data in addition to DL/UL control data. UL and DL subframes for NR can be as described in more detail below with respect to figures 6 and 7. Beamforming can be supported and beam direction can be dynamically set. Pre-encoded MIMO streams may also be supported. DL MIMO configurations can support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE. Multilayer transmissions with up to 2 streams per UE can be supported. Multiple cell aggregation can be supported with up to 8 server cells. Alternatively, NR can support a different air interface in addition to the OFDM-based interface. NR networks may include entities such as CUs and/or DUs.
[0059] [0059] In some examples, access to the air interface can be programmed, where a programming entity
[0060] [0060] Thus, in a wireless communication network with a programmed access to time and frequency resources and having a cellular configuration, a P2P configuration, and an interleaved configuration, a programming entity and one or more subordinate entities can communicate using programmed resources.
[0061] [0061] As noted above, a RAN can include a CU and DUs. An NR BS (e.g. gNB, 5G Node B, transmit receive point (TRP), access point (AP)) can correspond to one or multiple BS. NR cells can be configured as access cells (ACells) or data-only cells (DCells). For example, the RAN (eg a central unit or distributed unit) can configure the cells. DCells can be cells used in carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover. In some cases, DCells may not transmit sync signals – in some cases DCells may transmit SS. NR BSs can transmit downlink signals to UEs indicating cell type. Based on the cell type indication, the UE can communicate with NR BS. For example, the UE may determine NR BSs to consider cell selection, access and transfer and/or measurement based on the indicated cell type.
[0062] [0062] Figure 2 illustrates an illustrative logical architecture of a distributed radio access network (RAN) 200, which may be implemented in the wireless communication system illustrated in Figure 1. A 5G access node 206 may include a wireless controller. access node (ANC) 202. ANC may be a central unit (CU) of the distributed RAN 200. The return access channel interface to the next generation core network (NG-CN) 204 may be terminated at the ANC. The return access channel interface to neighboring next generation access nodes (NG-ANs) can be terminated at the ANC. ANC may include one or more TRPs 208 (which may also be referred to as BSs, NR BSs, B Nodes, 5G NBs, APs, or some other term). As described above, a TRP may be used interchangeably with "cell".
[0063] [0063] TRPs 208 can be a DU. TRPs can be connected to one ANC (ANC 202) or more than one ANC (not shown). For example, to share RAN, Radio as a Service (RaaS), and service-specific AND developments, TRP can be connected to more than one ANC. A TRP may include one or more antenna ports. TRPs can be configured to serve, individually (eg dynamic selection) or together (eg joint transmission) traffic to a UE.
[0064] [0064] Local architecture 200 can be used to illustrate the definition of forward access channel. The architecture can be defined by supporting forward access channel solutions across different types of development. For example, the architecture may be based on transmission network capabilities (eg, bandwidth, latency and/or ripple).
[0065] [0065] The architecture may share features and/or components with LTE. As per the aspects, Next Generation AN (NG-AN) 210 can support dual connectivity with NR. NG-AN can share a common forward access channel for LTE and NR.
[0066] [0066] The architecture may allow for cooperation between TRPs 208. For example, cooperation may be predetermined within a TRP and/or across TRPs through the ANC 202. According to the aspects, no inter-TRP interface may be required /gift.
[0067] [0067] According to the aspects, a dynamic configuration of split logic functions may be present within the 200 architecture. As will be described in more detail with reference to figure 5, the Radio Resource Control (RRC) layer, the of Packet Data Convergence Protocol (PDCP), the Radio Link Control (RLC) layer, the Media Access Control (MAC) layer, and Physical (PHY) layers can be adaptively located in the DU or CU (eg TRP or ANC respectively). In certain aspects, a BS may include a central unit (CU) (e.g., ANC 202) and/or one or more distributed units (e.g., one or more TRPs 208).
[0068] [0068] Figure 3 illustrates an illustrative physical architecture of a distributed RAN 300, in accordance with aspects of the present description. A centralized core network unit (C-CU) 302 can host the core network functions. C-CU can be developed centrally. C-CU functionality can be offloaded (eg Advanced Wireless Services (AWS)) to handle peak capacity.
[0069] [0069] A centralized RAN unit (C-RU) 304 can host one or more ANC functions. Optionally, the C-RU can host the core network functions locally. C-RU may feature distributed development. C-RU may be closer to the network edge.
[0070] [0070] A DU 306 can host one or more TRPs (edge node (EN), an edge unit (EU), a radio head (RH), an intelligent radio head (SRH), or the like). The DU can be located at the edges of the network with radio frequency (RF) functionality.
[0071] [0071] Figure 4 illustrates illustrative components of the BS 110 and UE 120 illustrated in Figure 1 that can be used to implement aspects of the present description. The BS may include a TRP or a gNB. One or more components of BS 110 and UE 120 may be used to practice aspects of the present disclosure. For example, antennas 452, Tx/Rx 454, processors 466, 458, 464 and/or controller/processor 480 of UE 120 and/or antennas 434, Tx/Rx 432, processors 420, 430, 438 and/or controller/processor 440 of BS 110 can be used to carry out the operations described herein and illustrated with reference to figures 9 and 10.
[0072] [0072] Figure 4 illustrates a block diagram of a design of a BS 110 and a UE 120, which may be one of the BSs and one of the UEs in Figure 1. For a tight association situation, the base station 110 may be the macro BS 110c in Figure 1 , and the UE 120 may be the UE 120y. Base station 110 may also be a base station of some other type. Base station 110 may be equipped with antennas 434a to 434t, and UE 120 may be equipped with antennas 452a to 452r.
[0073] [0073] At base station 110, a transmission processor 420 may receive data from a data source 412 and control information from a controller/processor 440. The control information may be for the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDDCH), etc. Data can be for Physical Downlink Shared Channel (PDSCH), etc. Processor 420 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Processor 420 may also generate reference symbols, for example, for PSS, SSS and cell specific reference signal (CRS). A transmission (TX) multiple input multiple output (MIMO) processor 340 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, and/or reference symbols, if applicable, and may provide output symbol sequences to modulators (MODs) 432a to 432t. Each modulator 432 may process a respective output symbol sequence (e.g., for OFDM, etc.) to obtain a sequence of output samples. Each modulator 432 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample sequence to obtain a downlink signal. Downlink signals from modulators 432a to 432t can be transmitted via antennas 434a to 434t, respectively.
[0074] [0074] At UE 120, antennas 452a to 452r can receive downlink signals from base station 110 and can provide received signals to demodulators (DEMODs) 454a to 454r, respectively. Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 454 may further process input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 456 can obtain symbols received from all demodulators 454a through 454r, perform MIMO detection on the received symbols, if applicable, and provide detected symbols. A receiving processor 458 may process (e.g., demodulate, de-interleave, and decode) the detected symbols, provide decoded data to the UE 120 to a data store 460, and provide decoded control information to a controller/processor 480.
[0075] [0075] In uplink, at UE 120, a transmission processor 464 may receive and process data (e.g. for Physical Uplink Shared Channel (PUSCH)) from a data source 462 and control information (e.g. , to the Physical Uplink Control Channel (PUCCH) from the controller/processor 480. The transmission processor 464 may also generate reference symbols for a reference signal. The transmission processor symbols 464 may be pre-encoded by a TX MIMO processor 466, if applicable, further processed by demodulators 454a to 454r (e.g., for SC-FDM, etc.), and transmitted to base station 110. At BS 110, uplink signals from UE 120 may be received by antennas 434, processed by modulators 432, detected by a MIMO detector 436, if applicable, and further processed by a receiving processor 438 to obtain decoded data and control information sent by the UE 120. Receiver 438 may provide the decoded data to a data store 439 and the decoded control information to the controller/processor 440.
[0076] [0076] The 440 controllers/processors and
[0077] [0077] Figure 5 illustrates a diagram 500 illustrating examples for implementing a communications protocol stack, in accordance with aspects of the present description. The illustrated communications protocol stacks can be implemented by devices operating in a 5G system. Diagram 500 illustrates a communications protocol stack including a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer. 520, a Media Access Control (MAC) layer 525, and a Physical (PHY) layer 530. In various examples, the layers of a protocol stack can be implemented as separate software modules, parts of a processor, or ASIC. , parts of distinctly located devices connected by a communications link, or various combinations thereof. Implementations at the same or another location can be used, for example, in a protocol stack for a network access device (eg, ANs, CUs, and/or DUs) or a UE.
[0078] [0078] A first option 505-a illustrates a split implementation of a protocol stack, in which the protocol stack implementation is split between a centralized network access device (e.g., an ANC 202 in Figure 2) and device distributed network access (eg DU 208 in figure 2). In the first option 505-a, an RRC layer 510 and a PDCP layer 515 can be implemented by the central unit, and an RLC layer 520, a MAC layer 525, and a PHY layer 530 can be implemented by the DU. In several examples, the CU and DU may have the same or different location. The first 505-a option can be useful in a macro cell, micro cell or pico cell development.
[0079] [0079] A second 505-b option illustrates a unified implementation of a protocol stack, in which the protocol stack is implemented in a single network access device (e.g., an access node (AN), a base station radio (NR BS), a new radio Node B (NR NB), a network node (NN)). In the second option, the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530 can each be implemented per AN. The second 505-b option may be useful in a femto cell development.
[0080] [0080] Regardless of whether a network access device implements part or all of a protocol stack, a UE can implement an entire 505-c protocol stack (e.g. RRC layer 510, PDCP layer 515, RLC layer 520, MAC layer 525, and PHY layer 530).
[0081] [0081] Fig. 6 is a diagram 600 illustrating an example of a DL centered subframe. The DL centered subframe may include a control part 602. The control part 602 may exist at the beginning of the DL centered subframe. Control part 602 may include various programming information and/or control information corresponding to various parts of the DL centered subframe. In some configurations, the control part 602 may be a physical DL control channel (PDCCH), as indicated in Figure 6. The DL centered subframe may also include a DL data part 604. The DL data part 604 may, sometimes referred to as the DL-centric subframe payload. The DL data part 604 may include the communication facilities used to communicate the DL data from the scheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE). In some configurations, the DL data portion 604 may be a physical DL shared channel (PDSCH).
[0082] [0082] The DL centered subframe may also include a common UL part 606. The common UL part 606 may sometimes be referred to as a UL burst, a common UL burst, and/or various other terms. The common UL part 606 may include feedback information corresponding to various other parts of the DL centered subframe. For example, the common UL part 606 may include feedback information corresponding to the control part 602. Non-limiting examples of the feedback information may include an ACK signal, a NACK signal, a HARQ flag, and/or various other suitable types of information. . The common UL part 606 may include additional or alternative information, such as information pertaining to random access channel (RACH) procedures, schedule requests (SRs), and various other suitable types of information. As illustrated in Figure 6, the end of the DL 604 data part may be separated in time from the beginning of the common UL 606 part. This temporal separation may sometimes be referred to as a space, a protection period, a protection interval. and/or various other suitable terms. This separation provides time for switching from DL communication (eg, receive operation by the subordinate entity (eg, UE)) to UL communication (eg, transmit by the subordinate entity (eg, UE)). A person skilled in the art will understand that the above is merely an example of a DL centered subframe, and alternative structures, having similar characteristics, may exist without necessarily departing from the aspects described herein.
[0083] [0083] Figure 7 is a diagram 700 illustrating an example of a UL centered subframe. The UL centered subframe may include a control part 702. The control part 702 may exist at the beginning of the UL centered subframe. The control part 702 in figure 7 may be similar to the control part described above with reference to figure 6. The UL centered subframe may also include a UL 704 data part. The UL 704 data part may sometimes be referred to as the UL-centered subframe payload. The UL part can refer to the communication facilities used to communicate UL data from the subordinate entity (eg, UE) to the programming entity (eg, UE or BS). In some configurations, the control part 702 may be a physical DL control channel (PDCCH).
[0084] [0084] As illustrated in Figure 7, the end of the 702 control part may be time-separated from the beginning of the UL 704 data part. This time separation may sometimes be referred to as a space, protection period, interval. of protection and/or various other suitable terms. This separation provides time for switching from DL communication (eg, receive operation by the programming entity) to UL communication (eg, transmission by the programming entity). The UL-centered subframe may also include a UL common part 706. The UL common part 706 in figure 7 may be similar to the UL common part 606 described above with reference to figure 6. The UL common part 706 may additionally or alternatively include information pertaining to channel quality indicator (CQI), audible reference signals (SRSs), and various other suitable types of information. Those skilled in the art will understand that the foregoing is merely an example of a UL centered subframe, and alternative structures, having similar characteristics, may exist without necessarily departing from the aspects described herein.
[0085] [0085] In some circumstances, two or more subordinate entities (eg UEs) may communicate with each other using side-link signals. Real-world applications of such side-link communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical entanglement , and/or various other suitable applications. Generally, a side-link signal can refer to a signal communicated from a subordinate entity (e.g. UE1) to another subordinate entity (e.g. UE2), without retransmitting that communication through the scheduling entity (e.g. UE or BS), although the programming entity may be used for programming and/or control purposes. In some examples, side-link signals may be communicated using licensed spectrum (unlike wireless local area networks, which typically use unlicensed spectrum).
[0086] [0086] A UE can operate in various radio resource configurations, including a configuration associated with transmitting pilots using a dedicated set of resources (e.g. a dedicated radio resource control (RRC) state, etc.) or a configuration associated with transmitting pilots using a common set of resources (eg a common RRC state, etc.). When operating in the RRC dedicated state, the UE may select a dedicated set of resources to transmit a pilot signal to a network. When operating in the RRC common state, the UE may select a common set of resources to transmit a pilot signal to the network. In any case, a pilot signal transmitted by the UE may be received by one or more network access devices, such as an AN, or a DU, or parts thereof. Each receiving network access device can be configured to receive and measure pilot signals transmitted in the common pool of resources and also receive and measure pilot signals transmitted in dedicated pools of resources, allocated to the UEs for which the access device to the network is an element of a monitoring set of network access devices for the UE. One or more of the receiving network access devices, or a CU, to which the receiving network access devices transmit the pilot signal measurements, may use the measurements to identify serving cells for the UEs, or to initiate a change. from the serving cell to one or more of the UEs. ILLUSTRATIVE SETUP AND OPERATION OF THE RESOURCE OF RADIO LINK MONITORING AND FAILURE RECOVERY BEAM
[0087] [0087] Certain wireless communication standards use beam-formed transmissions, where active beams are used to transmit and receive control and data. In accordance with aspects of the present description, active beams used for communication by a Node B (NB) and a UE may be misaligned due to beam switching failure (e.g. beams being switched to other beams that experience as much interference or deep fading that communications are blocked) or signal blocking (e.g. caused by a UE moving into a shadow of a building).
[0088] [0088] In aspects of the present description, a beam failure recovery procedure (e.g. performed by a UE and/or a network entity) can identify link problems and provide aperiodic (in-sync, IS ) and aperiodic out-of-sync (OOS) to higher layers (e.g., upper layers of a wireless communications protocol stack, as discussed above with reference to Figure 5). For this purpose, a network entity (e.g., an access node, a cell, or a next-generation Node B (gNB)) can configure the Beam Failure Recovery Reference Signal (BFR-RS) capabilities. in an EU.
[0089] [0089] In accordance with aspects of the present description, a beam failure recovery procedure can identify problems with an active control beam (e.g. used to carry PDCCH or PUCCH) based on measurements of one or more control signals. downlink reference (DL) (eg BFR-RS associated with the aforementioned BFR-RS features).
[0090] [0090] In aspects of the present description, a beam failure recovery procedure may also maintain a pool of candidate beams. That is, a beam failure recovery procedure may include processes for determining a set of candidate beams, informing a wireless communications device (e.g., a UE or a BS) of the candidate beams, and updating the wireless communications device. wire when candidate beams are updated (e.g. in the event of a change in channel conditions). One or more candidate beams may be used to send a beam failure recovery request if a UE or network entity determines that a beam failure (e.g., misalignment of a transmitting beam and a receiving beam of a pair of bundles) occurred.
[0091] [0091] In accordance with aspects of the present invention, a radio link monitoring procedure can identify link problems and provide periodic out-of-sync and out-of-sync indications to the upper layers. For this purpose, a network entity can configure X radio link monitoring reference signal (RLM-RS) resources on a UE.
[0092] [0092] Figure 8 illustrates an example 800 of beamed communication, including broadcast beams 806a, 806b, 806c and unicast beams 808a, 808b and 808c. While the example illustrates three diffusion beams and three unidiffusion beams, the present description is not limited thereto and aspects of the present description can be used in systems that use more or less diffusion beams and more or less unidiffusion beams. Broadcast beams can, for example, be used to transmit channels through a common UE seek space, while unicast beams are used to transmit channels through a UE specific seek space of the UE. A BS (eg, a gNB) 802 communicates with a UE 804 using active beams. The BS can transmit some signals using broadcast beams and other signals using unicast beams. In one example, broadcast beams may include broadcast transmissions (eg, transmissions destined for more than one UE). Unicast beams may include unicast transmissions. Unidiffusion beams may have better coverage than diffusion beams, for example, due to beam management and refinement procedures for unidiffusion beams. As illustrated in Figure 8, the diffusion beams 806 can be wider than the unicast beams 808. Additionally, the diffusion beams 806 may not reach the narrower unicast beams 808.
[0093] [0093] According to an example, the information transmitted in the broadcast beams includes PDCCH and PDSCH to carry the minimum remaining system information (RMSI). RMSI can include information similar to System Information Block-1 (SIB1) and SIB-2 in LTE. RMSI can be ported across PDSCHs and PDCCHs, which can provide grants for PDSCHs. On mmW systems, RMSI can be beam scanned, similar to a Main Information Block (MIB) in LTE. According to one example, RMSI may not be transmitted in unicast beams.
[0094] [0094] As noted above, a UE entering the system can receive information through the transmitted beams in the broadcast beams. Accordingly, the UE can receive RMSI through the broadcast beams 806. After obtaining the system information, the UE can be served using dedicated beams in the unicast beams.
[0095] [0095] By way of analogy, the coverage of the diffusion beams and unidiffusion beams can be considered as two concentric circles. The diameter of the circle representing the coverage area of the diffusion beams can be smaller than the diameter of the circle representing the coverage area of the unidiffusion beams. Accordingly, a UE may be in the coverage area of the outer circle, representing the unicast beams and not in the coverage area of the inner circle, representing the unicast beams. This situation can be referred to as a mismatch of broadcast and unicast coverage.
[0096] [0096] According to another example, a coverage mismatch can occur when a UE is in the coverage area of a unicast beam and not in the coverage area of an NR-SS or PBCH. Similar to RMSI, NR-SS and PBCH may not be transmitted on unicast beams. NR-SS may include the primary sync signal NR (NR-PSS), the secondary sync signal NR (NR-SSS), and the demodulation reference signal (DM-RS). Applying the two concentric circles analogy used above, a UE may be in the coverage area of the outer circle, which represents the unicast beams, and may not be in the coverage area of the inner circle, which represents NR-SS/PBCH.
[0097] [0097] Referring to Figure 8, a UE can be in a coverage mismatch when it is in a coverage area of one of the 808 unicast beams, and not in the coverage area of any of the 806 diffusion beams. As illustrated, the UE 804 may experience a coverage mismatch. Since part of the information can be transmitted using coverage beams and not using unicast beams, the UE
[0098] [0098] Since PBCH and RMSI are transmitted over the broadcast beams they may not be received in the same coverage area as the unicast beams (e.g. RMSI is transmitted on the broadcast beams), if the BS 802 changes the PBCH or broadcast beams, the UE 804 may not be able to receive PBCH and RMSI. A UE outside the coverage area of the broadcast beams, but within the coverage of a unicast beam, may obtain good decoding performance on the PDCCH and corresponding PDSCH on the unicast beams, while failing to decode PDCCH on the broadcast beams (e.g. , failure to decode RMSI), failing to detect NR-SS, and/or failing to decode PBCH.
[0099] [0099] Advantageously, aspects of the present description provide techniques for identifying a coverage mismatch and actions to be taken in the event of an identified coverage mismatch.
[00100] [00100] In accordance with aspects of the present description, detection of a problem by a radio link monitoring (RLM) procedure by a device (e.g. a UE) may result in the device initiating a failure procedure. radio link (RLF). In aspects of the present description, a relationship between an RLM procedure and an RLF procedure (eg, an LTE RLF procedure) for a primary cell (PCell) and a secondary primary cell (PSCell) is described in the tables below. As illustrated in the tables below, a device RLF procedure can use two timers, referred to as T310 and T313, to determine whether to report a Server Cell Group (SCG) failure (for example, an RLF to SCG). The RLF procedure can also refer to constants, which can be set or reconfigured based on network defaults or settings received from the network, to determine whether to start or stop the various timers.
[00101] [00101] In accordance with the aspects of the present description, the RLM-RS resources and the BFR-RS resources for a UE can be configured with different sets of broadcast beams and/or unicast beams which can cause one or more problems such as Described below.
[00102] [00102] In aspects of the present description, a UE may monitor a set of RLM-RS resources to determine whether to send periodic OOS indications. If the RLM-RS resource pool does not contain BFR-RS resources, then the physical layer (that is, layer one (L1)) of the UE protocol stack may send periodic OOS indications to higher layers despite the metric link quality, based on BFR-RS capabilities, is good. For example, the UE 804 (see Figure 8) can be configured with RLM-RS resources that are included in the 806 broadcast beams configured through NR-SS or CSI-RS. In the example, the UE can also be configured with BFR-RS features that are included in the unicast beams configured using
[00103] [00103] In accordance with aspects of the present description, a UE may monitor a set of RLM-RS resources to send periodic IS indications. The UE may also be configured with one or more candidate RS resources (e.g., beam pairs) to report a beam failure if the UE detects a beam failure. If the RLM-RS resource set does not contain a candidate RS resource (i.e., BFR candidate RS resources), then L1 may send periodic IS indications to higher layers despite the link quality metric, based on the RS resources of BFR candidate, be good. For example, the UE 804 (see Figure 8) can be configured with RLM-RS resources that are included in the 806 broadcast beams configured through NR-SS or CSI-RS. In the example, the UE can also be configured with BFR-RS features that are included in unicast beams configured using NR-SS or CSI-RS. Still in the example, the UE may experience a deterioration of the channel conditions, and the UE's L1 starts sending periodic OOS indications to the upper layers. In the example, the UE channel conditions can then be improved so that the link quality metric, based on the BFR-RS feature set, is good. Still in the example, L1 of the UE may not start sending the indications synchronously, since the RLM-RS resources that the UE uses in determining whether to send the indications synchronously do not include the BFR-RS resource set. In the example, the UE may declare an RLF as the UE's L1 does not start sending the indications in sync.
[00104] [00104] Figure 9 illustrates an illustrative timeline 900 for detecting physical layer problems (e.g., misalignment of a transmit beam and a receive beam of a pair of active beams), according to the aspects of the present description. As illustrated at 902, a UE (e.g., UE 120, illustrated in Fig. 1 or UE 804, shown in Fig. 8) can start counting OOS indications 904a, 904b, and 904c, obtained from L1. After N310 counts (e.g., three) of consecutive OOS indications to PCell, the UE may start timer T310, as illustrated at 910. At 920, timer T310 expires, and the UE transitions to a connection idle state. radio resources (RRC_IDLE), if security is not enabled, or the UE initiates a reconnection procedure.
[00105] [00105] Figure 10 illustrates an illustrative timeline 1000 for recovering from physical layer problems (e.g. misalignment of a transmit beam and a receive beam of a pair of active beams), according to aspects of the present description. As in Fig. 9, a UE (e.g., UE 120, shown in Fig. 1, or UE 804, shown in Fig. 8) may start timer T310 at 1010, after counting N310 consecutive OOS indications 1004a, 1004b, and 1004c for PCell. While T310 is operating, the channel conditions are improved and the UE counts consecutive synchronous indications 1012a, 1012b and 1012c. At 1020, the UE counted N311 (for example, three) consecutive sync indications and stopped timer T310 (that is, before timer T310 expired). As illustrated, the UE can remain in an RRC connected state (eg, RRC_Connected) without any other explicit signaling.
[00106] [00106] Fig. 11 illustrates illustrative operations 1100 that may be performed by a UE (e.g., UE 120, shown in Fig. 1, or UE 804, shown in Fig. 8), in accordance with aspects of the present description. The UE may include one or more modules of the UE 120 shown in Figure 4.
[00107] [00107] In block 1102, operations 1100 begin with the UE obtaining a first configuration, indicating one or more radio link monitoring reference signal (RLM-RS) resources, and one or more radio link monitoring reference signal resources (RLM-RS). Beam Failure Recovery (BFR-RS), where each RLM-RS resource corresponds to at least one first link, and each BFR-RS resource corresponds to at least one second link. For example, UE 804 obtains (e.g., receives on a transmission from BS 802) a first configuration indicating an RLM-RS resource (e.g., aligned with broadcast beam 806b) and a BFR-RS resource, where the resource RLM-RS corresponds to a first link (for example, a broadcast link from BS 802 through broadcast beam 806b) and the BFR-RS resource corresponds to a second link (for example, a unicast link from BS 802 through unicast beam 808b).
[00108] [00108] Operations 1100 continue at block 1104 with the UE getting a first indication that a first link quality for the first link is below a first threshold and a second link quality for the second link is above a second threshold . Continuing with the above example, the UE obtains a first indication that a first link quality for the first link (e.g., a received reference signal (RSRP) power for the broadcast link) and a second link quality for the second link (eg RSRP for the unicast link) is above a second threshold.
[00109] [00109] In block 1106, operations 1100 continue with the UE taking action against a radio link failure (RLF) based on the indication. Continuing with the above example, the UE takes action according to an RLF (for example, the UE sends a report to the BS 802, where the report indicates that the first link quality is below the first threshold, the second link quality link is above the second threshold, and the BFR-RS resource corresponds to the second link), based on the indication obtained in block 1104.
[00110] [00110] Fig. 12 illustrates illustrative operations 1200 that may be performed by a BS (e.g., BS 110, shown in Fig. 1, or BS 802, shown in Fig. 8), in accordance with aspects of the present description. The BS may include one or more BS modules 110, illustrated in Figure 4. Operations 1200 can be considered complementary to operations 1100, illustrated in Figure 11.
[00111] [00111] In block 1202, operations 1200 begin with the BS providing, to a user equipment (UE), a first configuration that indicates one or more of the radio link monitoring reference signal (RLM-RS) resources and one or more Beam Failure Recovery Reference Signal (BFR-RS) resources, where each RLM-RS resource corresponds to at least one first link and each BFR-RS resource corresponds to at least one second link. For example, the BS 802 provides (e.g. transmits) to the UE 804 a first configuration indicating an RLM-RS resource (e.g. aligned with broadcast beam 806b) and a BFR-RS resource where the RLM resource -RS corresponds to a first link (for example, a broadcast link from BS 802 through broadcast beam 806b), and the BFR-RS resource corresponds to a second link (for example, a unicast link from BS 802 through the unicast beam 808b).
[00112] [00112] Operations 1200 continue at block 1204 with the BS obtaining from the UE a report indicating that a first link quality for the first link is below a first threshold, a second link quality for the second link is above a second threshold, and the BFR-RS feature matches the second link. Continuing with the above example, the BS obtains (e.g. receives from UE 804) a report indicating that a first link quality for the first link (corresponding to the RLM-RS resource in block 1202) is below a first threshold and a second link quality for the second link is above a second threshold, and the BFR-RS resource matches the second link (that is, the link with quality above the second threshold).
[00113] [00113] At block 1206, operations 1200 continue with the BS providing a second configuration for the UE, where the second configuration includes the BFR-RS resource indicated in the report as an RLM-RS resource. Continuing with the above example, the BS provides (e.g. transmits) a second configuration to the UE, where the second configuration includes the BFR-RS feature (i.e. BFR-RS corresponding to the link with quality above the second block threshold 1204) indicated in the report as an RLM-RS resource (e.g. so that the UE can determine "in sync" or "out of sync" based on the BFR-RS resource).
[00114] [00114] In accordance with aspects of the present description, a network entity (e.g. a gNB) can configure X RLM-RS resources and Z BFR-RS resources in a UE, as described above in blocks 1202 and 1102 of the figures 11 and
[00115] [00115] In aspects of the present description, the network entity may configure periodic OOS indications (e.g. periodic indications that beams are out of sync) to the UE if an estimated link quality corresponding to an error rate of hypothetical PDCCH block (BLER), based on Y configured RLM-RS resources, is below a first threshold. Y can be less than or equal to X. That is, the UE can be configured to trigger (e.g. send from L1 to higher protocol layers) OOS indications if a link quality matching a desired BLER, from a PDCCH hypothetical, received at any of the Y RLM-RS resources is below a threshold (that is, the link quality is too low for transmission of a PDCCH with the desired BLER or a lower BLER), and in some cases ( for example, Y = X), the Y RLM-RS resources are all RLM-RS resources configured on the UE. If Y and X are equal, then a link quality corresponding to the desired BLER of a hypothetical PDCCH, being greater than the first threshold, prevents an OOS indication from being triggered. The triggered OOS indication may be an example of a first indication of the first link quality, as described above with reference to block 1104 of Fig. 11.
[00116] [00116] In accordance with aspects of the present description, the network entity may configure periodic OOS indications (e.g. periodic indications that the beams are out of sync) to the UE if an estimated link quality, corresponding to a BLER The hypothetical target PDCCH based on W configured BFR-RS resources is below a second threshold (that is, the link quality on the W BFR-RS resources is too low to transmit a PDCCH with the desired BLER or a lower BLER) . W can be less than or equal to Z. That is, the UE can be configured to trigger (e.g. send from L1 to higher protocol layers) OOS indications of whether the link quality matches a desired BLER, from a Hypothetical PDCCH received on W BFR-RS resources is below a second threshold, and in some cases (eg W=Z) the W BFR-RS resources are all of the BFR-RS resources configured on the UE. The UE that is not triggering an OOS indication based on BFR-RS resources can be an example of a second indication of the second link quality, as described above with reference to block 1104 in Fig. 11.
[00117] [00117] In aspects of the present description, the network entity may configure the UE to send an indication (e.g. to the network entity) of when the UE triggers one or more periodic OOS based on the Y RLM-RS resources and no periodic OS indication is triggered based on the W BFR-RS resources. That is, the UE sends an indication to the network entity that the UE cannot communicate with the network entity through Y RLM-RS resources, but can communicate through at least one BFR-RS resource.
[00118] [00118] In accordance with aspects of the present description, a UE may send the indication (that the UE triggered one or more periodic OOS indications based on the Y RLM-RS resources and no periodic OOS indication was triggered based on the W resources BFR-RS) through at least one of PUCCH, PUSCH and SRS.
[00119] [00119] In aspects of the present description, a UE may send a report including the indication (that the UE triggered one or more periodic OOS indications based on the Y RLM-RS resources and no periodic OOS indication was triggered based on the W resources BFR-RS) via at least one radio resource control (RRC) signaling or media access control (MAC) control element (MAC-CE). The report can carry one or more NR-SS or CSI-RS identifiers that are present in the Z BFR-RS resources. NR-SS or CSI-RS identifiers can identify one or more of the BFR-RS resources for which a BLER from a hypothetical PDCCH is below the second threshold (for example, the identifiers indicate a BFR-RS resource matching a beam that the UE can use to communicate with the network entity).
[00120] [00120] In accordance with aspects of the present description, when the UE triggers one or more periodic OOS indications based on Y RLM-RS resources and no periodic OOS indications on W BFR-RS resources, as described above, the UE may pause the count of periodic OOS indications based on the X RLM-RS resources in the N310 direction for a duration of T ms and/or until the UE receives an additional message (e.g. a configuration change of the RLM-RS resources and/or BFR-RS resources) from the network entity. T may be a predetermined value (e.g. from a network standard) or it may be configured on the UE by the network entity or other network entity. If the UE pauses counting of OOS indications towards N310, the UE may keep a separate count of OOS indications that occur during the count pause and additionally count separate from the count when the pause is undone, or alternatively, the UE can resume counting OOS indications when the pause is undone without considering any OOS indications that occurred during the pause.
[00121] [00121] In aspects of the present description, when the UE triggers one or more periodic OOS indications based on the Y RLM-RS resources, and no periodic OOS indications based on the W BFR-RS resources, as described above, the UE may pause or maintain a timer T310 for a duration of T ms, or the UE may pause or hold the timer T310 until the UE receives an additional message from the network. T can be a predetermined value (e.g. from a network pattern) or it can be configured on the UE by the network entity (that is, the network entity that configures the Y RLM-RS resources and the W BFR- RS in UE) or another network entity.
[00122] [00122] In accordance with aspects of the present description, when the UE triggers one or more periodic OOS indications based on the Y RLM-RS resources and no periodic OOS indications based on the W BFR-RS resources, as described above, the UE can increase N310 by a specific amount or by a certain amount (eg as configured by the network). Additionally or alternatively, the UE may increase T310 by a specific value or increase T310 by T ms. T can be a predetermined value (e.g. from a network pattern) or it can be configured on the UE by the network entity (that is, the network entity that configures the Y RLM-RS resources and the W BFR- RS in UE) or another network entity.
[00123] [00123] In aspects of the present description, when the UE triggers one or more periodic OOS indications on Y RLM-RS resources and no periodic OOS indications based on W BFR-RS resources, as described above, the UE may add, remove and /or replace one or more of the X RLM-RS resources using the Z BFR-RS resources and notify the network entity (that is, the network entity that configures the Y RLM-RS resources and the W BFR-RS resources on the UE ) about changes to a report.
[00124] [00124] In accordance with aspects of the present description, when the UE triggers one or more periodic OOS indications based on Y RLM-RS resources and no periodic OOS indications based on W BFR-RS resources, as described above, the UE may report one or more of the Z BFR-RS resources. The network entity can then transmit one or more of the NR-SS, RMSI or PBCH through the reported BFR-RS resources.
[00125] [00125] In accordance with aspects of the present description, after receiving a report from a UE, that the UE triggered one or more OOS indications based on Y RLM-RS resources and no periodic OOS indications based on W BFR resources -RS, as described above, the network (e.g. a gNB) can reconfigure (e.g. add, replace and/or eliminate one or more of the X RLM-RS resources in a second configuration. This could be an example of provisioning of a second configuration for the UE, as described above with reference to block 1206 in Fig. 12.
[00126] [00126] In accordance with aspects of the present description, after obtaining a second configuration of the X RLM-RS resources as described above, the UE may advance an N310 count (i.e., cease a pause in the count of OOS indications, as mentioned above) or a T310 timer (i.e., stop holding the T310 timer as mentioned above).
[00127] [00127] Fig. 13 illustrates illustrative operations 1300 that may be performed by a UE (e.g., UE 120, shown in Fig. 1 or UE 804, shown in Fig. 8), in accordance with aspects of the present description. The UE may include one or more modules of the UE 120 shown in Figure 4.
[00128] [00128] In block 1302, operations 1100 begin with the UE obtaining a configuration that indicates one or more radio link monitoring reference signal (RLM-RS) resources and one or more recovery reference signal resources. beam failure (BFR-RS). For example, UE 804 obtains (e.g. receives on a transmission from BS 802) a configuration indicating an RLM-RS resource (e.g. aligned with the broadcast beam 806b) and a BFR-RS resource (e.g. , aligned with the unicast beam 808b).
[00129] [00129] Operations 1300 continue at block 1304 with the UE transmitting a beam failure recovery request through at least one resource. Continuing with the above example, the UE transmits a beam failure recovery request through at least one first resource (e.g. through a candidate beam that the UE selects, where the candidate beam is not included in the RLM-RS resource indicated, obtained by the UE at block 1302. That is, the candidate beam is not aligned with the diffusion beam 806b).
[00130] [00130] In block 1306, operations 1300 continue with the UE taking action regarding a radio link failure (RLF) when the first resource is not included in one or more RLM-RS resources or when the UE receives a response for the beam failure recovery request. Continuing with the above example, the UE declares that an RLF has occurred, as the candidate beam selected by the UE in block 1304 is not included in the RLM-RS resource in the configuration obtained by the UE in the block
[00131] [00131] Fig. 14 illustrates illustrative operations 1400 that may be performed by a BS (e.g., BS 110, shown in Fig. 1, or BS 802, shown in Fig. 8), in accordance with aspects of the present description. The BS may include one or more modules of the BS 110 illustrated in Figure 4. Operations 1400 may be considered complementary to operations 1300 illustrated in Figure 13.
[00132] [00132] In block 1402, operations 1200 begin with the BS providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and a or more Beam Failure Recovery Reference Signal (BFR-RS) capabilities. For example, the BS 802 provides (e.g. transmits) to the UE 804 (illustrated in Figure 8) a first configuration indicating an RLM-RS resource aligned with the broadcast beam 806b and a BFR-RS resource aligned with the beam 806b. unicast beam 808b.
[00133] [00133] Operations 1400 continue at block 1404 with the BS receiving a beam failure recovery request from the UE through a first resource included in one or more BFR-RS resources. Continuing with the above example, the BS receives a beam failure recovery request from the UE via the unicast beam 808b.
[00134] [00134] At block 1406, operations 1400 continue with the BS providing a second configuration for the UE, where the second configuration includes the first resource as an RLM-RS resource. Continuing with the above example, the BS provides (eg, transmits, implicitly indicates) a second configuration for the UE, where the second configuration includes the unicast beam 808b as an RLM-RS resource.
[00135] [00135] In aspects of the present description, a BS may provide the second configuration to the UE (i.e., as described in block 1406 above), by implicitly indicating to the UE to use a default configuration, i.e., a configuration that the UE can derive without receiving from the BS. One technique of implicitly indicating to the UE of using the default configuration may be for the BS to acknowledge receipt of a beam failure recovery request (i.e., as described in block 1404 above) without transmitting a second configuration to the UE.
[00136] [00136] In accordance with aspects of the present description, a network entity (e.g. a gNB) can configure X RLM-RS resources and Z BFR-RS resources in a UE, as described above in blocks 1402 and 1302 of the figures 13 and
[00137] [00137] In aspects of this description, the network entity may configure periodic IS indications (e.g. periodic indications that beams are in sync) to the UE if an estimated link quality corresponding to a block error rate Hypothetical PDCCH (BLER), based on at least one configured RLM-RS resource, is above a third threshold. That is, the UE can be configured to trigger (e.g. send from L1 to higher protocol layers) an IS indication of whether the link quality, which corresponds to a desired BLER from a hypothetical PDCCH, is received at any given time. one of the RLM-RS resources, is above a third threshold.
[00138] [00138] In accordance with the aspects of the present description, the network entity may configure suitability criteria in the UE for the UE to select a candidate beam to send a beam failure recovery request. Suitability criteria can be based on CSI-RS or SS blocks that satisfy one or more thresholds (eg thresholds regarding OOS indications for BFR-RS resources, as described above with reference to Figures 11 and 12).
[00139] [00139] In aspects of the present description, the UE may send a beam failure recovery request to the network entity (e.g. a gNB) on one or more of the candidate RS resources as described above with reference to block 1304 of Figure 13. For example, UE 804 (illustrated in Figure 8) can be configured by gNB 802 with suitability criteria based on CSI-RS or SS blocks, for example, as mentioned above. In the example, the UE may transmit a beam failure recovery request (e.g., as mentioned above in block 1304 of Fig. 13 ) on each of the plurality of candidate beams that the UE selects based on suitability criteria.
[00140] [00140] According to aspects of the present description, since candidate RS resources may not be part of the X RLM-RS resources configured in the UE (e.g., see blocks 1302 and 1402 in Figures 13-14), L1 of the UE protocol can send periodic OOS indications to upper layers.
[00141] [00141] In the aspects of the present description, when the candidate RS resource is not part of the X RLM-RS resources or when the beam failure recovery procedure is successful, that is, the UE receives a response to the request for beam failure recovery on one or more candidate beams, then the UE can pause counting periodic OOS indications based on the X RLM-resources
[00142] [00142] In accordance with the aspects of the present description, when the candidate RS resource is not part of the X RLM-RS resources or when the beam failure recovery procedure is successful, then the UE may pause or hold a timer T310 for a duration of T ms and/or until the UE receives an additional message from the network entity. T may be a predetermined value (e.g. from a network standard) or it may be configured on the UE by the network entity or other network entity.
[00143] [00143] In the aspects of the present description, when the candidate RS resource is not part of the X RLM-RS resources, or when the beam failure recovery procedure is successful, then the UE may increase N310 to a specific value or by a delta (e.g. as configured by the network entity) and/or the UE may increase T310 to a specific value or increase T310 by T ms. T may be a predetermined value (e.g. from a network standard) or it may be configured on the UE by the network entity or other network entity.
[00144] [00144] In accordance with aspects of the present description, upon receipt of the Beam Failure Recovery Request message, as described above in block 1404 of Fig. 14, a network entity (e.g., a gNB) may reconfigure (e.g., (e.g. add, replace and/or delete) one or more of the X RLM-RS resources and send a new configuration to the UE, as described above in block 1406 of figure 14.
[00145] [00145] In aspects of the present description, upon receipt of a second configuration of the X RLM-RS resources by a UE, as described above with reference to block 1404 of Fig. 14, the UE may advance an N310 count (i.e., cease pause the OOS indication count) or a T310 timer (that is, stop pausing the T310 timer).
[00146] [00146] In accordance with aspects of the present description, upon receipt of a second configuration of X RLM-RS resources by a UE, as described above with reference to block 1404 of Fig. 14, the UE may utilize the RLM-RS resources of the second configuration for radio link monitoring.
[00147] [00147] The methods described here comprise one or more steps or actions to achieve the method described. The steps and/or actions of the method may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and/or usage of specific steps and/or actions may be modified without departing from the scope of the claims.
[00148] [00148] As used here, a phrase referring to "at least one of" a list of items refers to any combination of those items, including singular elements. As an example, "at least one of: a, b, or c" must cover a, b, c, ab, ac, bc, and a-bc, plus any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, a-cc, bb, bbb, bbc, cc and ccc or any other ordering of a, b and c).
[00149] [00149] As used here, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, querying (e.g., querying a table, database, or other data structure), evaluating, etc. Furthermore, "determining" may include receiving (eg, receiving information), accessing (eg, accessing data in a memory), and the like. Further "determining" may include resolving, selecting, choosing, establishing and the like.
[00150] [00150] The foregoing description is provided to enable those skilled in the art to practice the various aspects described herein. Various modifications of these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Accordingly, the claims should not be limited to the aspects illustrated here, but the full scope consistent with the language of the claims should be agreed, where reference to an element in the singular should not mean "one and only one" unless specifically mentioned, but instead "one or more". Unless specifically stated otherwise, the term "some" refers to one or more. All structural and functional equivalences to the elements of the various aspects described throughout this specification, which are known or will later become known to those skilled in the art, are expressly incorporated herein by reference and are intended to be embraced by the claims. Furthermore, nothing described herein should be dedicated to the public regardless of whether such description is explicitly mentioned in the claims. No element of claim shall be considered under the provision of 35 USC § 112, sixth paragraph, unless the element is expressly mentioned using the phrase "means to or in the case of a method claim, the element is mentioned using the phrase "step to".
[00151] [00151] The various operations of the methods described above can be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software components and/or modules, including, but not limited to, a circuit, an application-specific integrated circuit (ASIC), or processor. Generally, when there are operations illustrated in the figures, those operations may have corresponding means plus counterparty function components with similar numbering.
[00152] [00152] According to the aspects, the means for receiving, means for transmitting, means for detecting and means for performing one or more actions may be performed by one or more antennas 452, Tx/Rx 454, processors 466, 458, 464 and/or controller/processor 480 of UE 120 or antenna 434, Tx/Rx 432, processors 420, 430, 438 and/or controller/processor 440 of BS 110.
[00153] [00153] If implemented in hardware, an illustrative hardware configuration may comprise a processing system on a wireless node. The processing system can be implemented with a bus architecture. The bus can include any number of buses and interconnecting bridges depending on the specific application of the processing system and overall design constraints. The bus can unite several circuits including a processor, machine-readable medium, and a bus interface. The bus interface can be used to connect a network adapter, among other things, to the processing system via the bus. The network adapter can be used to implement PHY layer signal processing functions. In the case of a user terminal 120 (see figure 1), a user interface (eg keyboard, monitor, mouse, joystick, etc.) can also be connected to the bus. The bus may also connect various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art and therefore will not be described further. The processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can run software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and overall design constraints imposed on the system as a whole.
[00154] [00154] If implemented in software, functions can be stored or transmitted as one or more instructions or code on a computer-readable medium.
[00155] [00155] A software module may comprise a single instruction, or many instructions, and may be distributed across several different code segments, between different programs, and across multiple storage media. The computer readable medium may comprise various software modules. Software modules include instructions that, when executed by an apparatus, such as a processor, cause the processing system to perform various functions. Software modules may include a transmit module and a receive module. Each software module may reside on a single storage device or may be distributed across multiple storage devices. By way of example, a software module can be loaded into RAM from a hard drive when a trigger event occurs. During the execution of the software module, the processor can load part of the instructions into the temporary memory to increase the access speed. One or more lines of temporary storage can then be loaded into a general log file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.
[00156] [00156] Also, any connection is properly called a computer-readable medium. For example, if the software is transmitted from a network site, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies, such such as infrared (IR), radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of quite. Floppy disk and disk, as used here, include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Blu-ray disk, where floppy disks normally reproduce the data magnetically, while discs reproduce the data optically with lasers. Thus, in some respects, computer-readable media may comprise non-transient computer-readable media (eg, tangible media). Additionally, for other aspects the computer readable medium may comprise transient computer readable medium (e.g. a signal). Combinations of the above must also be included in the scope of computer readable media.
[00157] [00157] In this way, certain aspects can comprise a computer program product to perform the operations presented here. For example, such a computer program product may comprise a computer readable medium having instructions stored (and/or encoded) therein, the instructions being executable by one or more processors to perform the operations described herein. For example, instructions for performing the operations described here and illustrated in figures 11 to 14.
[00158] [00158] Additionally, it should be appreciated that modules and/or other suitable means for carrying out the methods and techniques described herein may be downloaded and/or otherwise obtained by a user terminal and/or base station, as applicable. For example, such a device may be coupled to a server to facilitate the transfer of media to carry out the methods described herein. Alternatively, various methods described here may be provided through the storage media (e.g. RAM, ROM, a physical storage medium such as a compact disk (CD) or floppy disk, etc.), so that the user terminal and/or base station can obtain the various methods after docking or providing the storage media to the device. Furthermore, any other technique suitable for providing the methods and techniques described herein for a device may be used.
[00159] [00159] It should be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

权利要求:
Claims (30)
[1]
1. A method for wireless communications performed by a user equipment, comprising: Obtaining a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more radio link monitoring reference signal resources (RLM-RS) beam failure recovery (BFR-RS), where each RLM-RS resource corresponds to at least one first link, and each BRF-RS resource corresponds to at least one second link; Get a first indication that a first link quality for the first link is below a first threshold and a second link quality for the second link is above a second threshold; e Take action on a radio link failure (RLF) based on the indication.
[2]
2. Method according to claim 1, wherein performing the action comprises: Sending a second indication that the first link quality is below the first threshold and the second link quality is above the second threshold.
[3]
A method according to claim 2, wherein sending the second indication comprises: Sending the second indication through one of a physical uplink control channel (PUCCH), a physical uplink shared channel, or a sound reference (SRS).
[4]
4. Method according to claim 1, in which performing the action comprises:
Submit a report, where the report indicates that the first link quality is below a first threshold, the second link quality is above the second threshold, and the BFR-RS resource matches the second link.
[5]
A method according to claim 4, further comprising: Obtaining a second configuration, where the second configuration indicates the RLM-RS resources that include the BFR-RS resource corresponding to the second link.
[6]
6. Method according to claim 1, in which performing the action comprises: Cease counting of out-of-sync (OOS) indications based on RLM-RS resources.
[7]
A method as claimed in claim 6, further comprising: Starting a timer; and Continue counting OOS indications based on RLM-RS resources upon timer expiration.
[8]
A method according to claim 6, further comprising: Receiving a message from a network; and Continue to count OOS indications based on RLM-RS resources in response to the message.
[9]
A method as claimed in claim 1, wherein performing the action comprises: Pausing an out-of-sync timer (OOS).
[10]
10. Method according to claim 1, in which performing the action comprises:
Increase a threshold number of out-of-sync (OOS) indications.
[11]
A method as claimed in claim 1, wherein performing the action comprises: Raising a threshold of an out-of-sync timer (OOS).
[12]
12. Method according to claim 1, in which performing the action comprises: Removing one of the RLM-RS resources from the first configuration.
[13]
13. Method according to claim 1, in which performing the action comprises: Adding one of the BFR-RS resources to the RLM-RS resources.
[14]
14. A method for wireless communications performed by a base station, comprising: Providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more Beam Failure Recovery Reference Signal (BFR-RS) resources, where each RLM-RS resource corresponds to at least one first link, and each BFR-RS resource corresponds to at least one second link; Get a report from the UE that indicates that a first link quality for the first link is below a first threshold, a second link quality for the second link is above a second threshold, and the BFR-SR resource matches the second link ; and Provide a second configuration for the UE, where the second configuration includes the BFR-RS resource indicated in the report as an RLM-RS resource.
[15]
A method according to claim 14, wherein the first configuration indicates one or more RLM-RS resources that are not indicated in the second configuration.
[16]
The method of claim 14, wherein the second configuration indicates one or more RLM-RS resources that are not indicated in the first configuration.
[17]
17. Method for wireless communications performed by a user equipment (UE), comprising: Obtaining a first configuration indicating one or more radio link monitoring reference signal (RLM-RS) resources and one or more signal resources Beam Failure Recovery Reference (BFR-RS); Transmit a beam failure recovery request through at least one first resource; and Take action regarding a radio link failure (RLF) when the first resource is not included in one or more RLM-RS resources or when the UE receives a response to the beam failure recovery request.
[18]
A method according to claim 17, wherein the first resource is included in at least one of: One or more RLM-RS resources, or One or more BFR-RS resources.
[19]
The method of claim 17, wherein the first configuration indicates suitability criteria for selecting a candidate beam for sending a beam failure recovery request.
[20]
The method of claim 17, wherein the first configuration indicates suitability criteria for selecting a candidate beam for sending a beam failure recovery request.
[21]
Method according to claim 17, wherein performing the action comprises: Cease counting out-of-sync indications (OOS) based on RLM-RS resources.
[22]
The method of claim 20, further comprising: Starting a timer; and Continue counting OOS indications based on RLM-RS resources after the timer expires.
The method of claim 20, further comprising: Receiving a message from a network; and Continue counting OOS indications based on RLM-RS resources in response to the message.
[23]
A method according to claim, wherein performing the action comprises: Pausing an out-of-sync timer (OOS).
[24]
A method according to claim 17, wherein carrying out the action comprises: Increasing a threshold number of out-of-sync indications (OOS).
[25]
The method of claim 17, wherein performing the action comprises: Raising a threshold of an out-of-sync timer (OOS).
[26]
A method as claimed in claim 17, wherein the UE receives the response to the beam failure recovery request, and the method further comprises: Receiving a second configuration from a network, wherein the second configuration indicates one or more others RLM-RS resources different from RLM-RS resources in the first configuration; and Perform radio link monitoring using other RLM-RS resources.
[27]
27. A method for wireless communications performed by a base station (BS), comprising: Providing, to a user equipment (UE), a first configuration indicating one or more radio link monitoring reference signal (RLM- RS) and one or more Beam Failure Recovery Reference Signal (BFR-RS) capabilities; Receive a beam failure recovery request from the UE through a first resource included in one or more BFR-RS resources; and Provide a second configuration for the UE, where the second configuration includes the first resource as an RLM-RS resource.
[28]
The method of claim 27, wherein the first configuration includes suitability criteria for selecting a candidate beam to send a beam failure recovery request.
[29]
The method of claim 27, wherein the second configuration indicates one or more RLM-RS resources that are not indicated in the first configuration.
[30]
The method of claim 27, wherein providing the second configuration comprises: Transmitting a response to the beam failure recovery request, wherein the response implicitly indicates that the second configuration includes the first resource as an RLM- LOL.

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法律状态:
2021-11-23| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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US201762557002P| true| 2017-09-11|2017-09-11|

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US62/557,002|2017-09-11|

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US16/125,140|2018-09-07|

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US16/125,140|US11184080B2|2017-09-11|2018-09-07|Radio link monitoring and beam failure recovery resource configuration and operation|

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PCT/US2018/050181|WO2019051362A1|2017-09-11|2018-09-10|Radio link monitoring and beam failure recovery resource configuration and operation|

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