Bfd / bfr reference signal requested by ue

Abstract

The present disclosure provides systems, devices, apparatuses, and methods, including computer programs encoded on storage media, for UE-requested BFD / BFR reference signals. In aspects, the UE can transmit, to a base station, a request for a list of beam sets for BFD and a list of candidate beam sets for BFR. The UE can receive, from the base station based on the transmitted request, information indicating the beam sets for BFD and the candidate beam sets for BFR.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of U.S. Provisional Application S / N. 63 / 023,511, entitled “UE Requested BFD / BFR Reference Signal,” filed May 12, 2020, and U.S. Application No. 17 / 314,986, entitled “UE Requested BFD / BFR Reference Signal,” filed May 7, 2021, which are expressly incorporated by reference herein in their entirety. BACKGROUND TECHNICAL FIELD

[0004] This disclosure relates generally to communication systems, and more specifically to user equipment (UE) requested beam failure detection (BFD) / beam failure recovery (BFR) reference signals.

[0005] INTRODUCTION

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. 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, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0007] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is a continuing

[0008] SUMMARY

[0009] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0010] A user equipment (UE) can be configured by a base station with two sets of reference signal (RS) beams (e.g., a first set of RS beams for beam failure detection (BFD) and a second set of RS beams for beam failure recovery (BFR)). The UE can perform measurements on the set of beams for BFD over a predetermined measurement period. If a maximum consecutive beam count determined to be below a threshold measurement value is reached during the measurement period, the UE can perform measurements on a candidate beam in the set of beams for BFR. If the candidate beam is determined to be above the threshold measurement value within a BFR timer interval, the UE can initiate a random access channel (RACH) procedure on the candidate beam. Otherwise, the UE can determine that a radio link failure (RLF) has occurred.

[0011] Accordingly, a UE can be configured to determine that reception of information on a serving beam is obstructed (e.g., by a temporary or permanent obstruction) but that a different beam, such as a beam outside of a set of RS beams, can be a suitable replacement for the serving beam based on movement, rotation, interference patterns, etc. As such, the UE can transmit a request to a base station including a suitable list of sets of RS beams to be used for BFD and / or BFR. If the base station grants the UE to utilize the requested beams in the list based on the transmitted request, the base station can configure the UE based on all or a portion of the requested list. The requested list can include beams associated with the same cell (e.g., a primary cell (Pcell) or a primary secondary cell (PScell)) or the requested list can include a subset of beams associated with different cells.

[0012] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can transmit, to a base station, a request for a list of sets of beams for BFD and a list of candidate sets of beams for BFR. The at least one processor can be further configured to receive, from the base station based on the transmitted request, information indicating the sets of beams for BFD and the candidate sets of beams for BFR.

[0013] In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus can receive, from a UE, a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; and transmit, to the UE based on the received request, information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery.

[0014] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects can be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram illustrating an example of a wireless communications system and an access network.

[0017] Figure 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

[0018] Figure 2B is a diagram illustrating an example of downlink channels within a subframe, in accordance with various aspects of the present disclosure.

[0019] Figure 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

[0020] Figure 2D is a diagram illustrating an example of uplink channels within a subframe, in accordance with various aspects of the present disclosure.

[0021] Figure 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.

[0022] Figure 4 is a call flow diagram illustrating communications between a UE and a base station.

[0023] Figure 5 is a diagram illustrating a beam failure detection (BFD) / beam failure recovery (BFR) procedure.

[0024] Figure 6 is a flow diagram of a method of wireless communication at a UE.

[0025] Figure 7 is a flow diagram of a method of wireless communication at a base station.

[0026] Figure 8 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0027] Figure 9 is a diagram illustrating an example of a hardware implementation for an example apparatus.

[0028] DETAILED DESCRIPTION

[0029] The detailed description set forth below, in connection with the appended drawings and embodiments described therewith, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein can be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without

[0030] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0031] By way of example, an element, or any portion of an element, or any combination of elements can be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLD), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system can execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0032] Accordingly, in one or more example embodiments, the functions described can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that is capable of storing computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0033] Figure 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and a 5G Core (5GC) network 190. The base stations 102 can include macro cells (high power cellular base stations) and / or small cells (low power cellular base stations). The macro cells can include base stations. The small cells can include femtocells, picocells, and microcells.

[0034] The base stations 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface). The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) can interface with the 5GC network 190 through second backhaul links 184. In addition to other functions, the base stations 102 can perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of NAS messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 can communicate directly or indirectly (e.g., through the EPC 160 or the 5GC network 190) with each other over third backhaul links 134 (e.g., X2 interface). The first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 can be wired or wireless.

[0035] The base stations 102 can wirelessly communicate with the UEs 104. Each of the base stations 102 can provide communication coverage for a respective geographic coverage area 110. There can be overlapping geographic coverage areas 110. For example, a small cell 102' can have a coverage area 110' that overlaps with one or more macrocells 102. A network that includes both small cell and macrocells can be known as a heterogeneous network. A heterogeneous network can also include Home Evolved Node Bs (eNBs) (HeNBs), which can provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 can include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and / or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 can use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links can be through one or more carriers, where a carrier can be a set of

[0036] Certain UEs 104 can communicate using device-to-device (D2D) communication link 158. The D2D communication link 158 can use DL / UL WWAN spectrum. The D2D communication link 158 can use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication can be through a variety of wireless D2D communication systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0037] The wireless communications system can further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum. When communicating in an unlicensed frequency spectrum, the STAs 152 / AP 150 can perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

[0038] The small cell 102' can operate in a licensed and / or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' can employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102' employing NR in an unlicensed frequency spectrum can boost coverage and / or increase capacity for the access network.

[0039] Whether a small cell 102' or a large cell (e.g., macro base station), the base station 102 can include and / or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180 can operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and / or near mmW frequencies in communication with the UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 can be referred to as a mmW base station. Extremely high frequency (EHF) is a portion of the RF in the electromagnetic spectrum. EHF has a range from 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band can be referred to as a millimeter wave. Near mmW can extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW / near mmW radio frequency (RF) band (e.g., 3 GHz - 300 GHz) has extremely high path loss and a short range. The mmW base station 180 can utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 180 and the UE 104 can each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0040] The base stations 180 can transmit to the UEs 104 on one or more transmission directions 182'. The UEs 104 can receive the beamformed signals from the base stations 180 on one or more reception directions 182". The UEs 104 can also transmit to the base stations 180 on one or more transmission directions. The base stations 180 can receive the beamformed signals from the UEs 104 on one or more reception directions. The base stations 180 / UEs 104 can perform beam training to determine the best reception and transmission directions for each of the base stations 180 / UEs 104. The transmission and reception directions for the base stations 180 can or can not be

[0041] The EPC 160 can include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 can be in communication with a home subscriber server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and the BM-SC 170 are connected to the IP services 176. The IP services 176 can include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 can provide functions for MBMS user service provisioning and

[0042] The core network 190 can include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 can be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UE IP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 can include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) Streaming (PSS) Service, and / or other IP services.

[0043] A base station can include and / or be referred to as a gNB, NodeB, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit reception point (TRP), or some other suitable terminology. The base station 102 provides wireless access to the EPC 160 or core network 190 for the UEs 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitch

[0044] Referring again to Figure 1In certain aspects, the UE 104 may include a beam failure detection (BFD) / beam failure recovery (BFR) requester component 198 configured to transmit a request for a list of beam sets for BFD and a list of candidate beam sets for BFR; and receive information indicating the beam sets for BFD and the candidate beam sets for BFR based on the transmitted request. In certain aspects, the base station 180 may include a BFD / BFR indicator component 199 configured to receive a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery from the UE; and transmit information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery to the UE based on the received request. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0045] Figure 2A FIG200 is a diagram illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B is a diagram 230 illustrating an example of DL channels within a 5G / NR subframe. Figure 2C FIG250 is a diagram illustrating an example of a second subframe within a 5G / NR frame structure. Figure 2D 280 is a diagram illustrating an example of UL channels within a 5G / NR subframe. The 5G / NR frame structure can be frequency division duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL; or it can be time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL. Figure 2A 、 2C In the example provided, the 5G / NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and F is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe can be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible codewords. The UE is configured with the slot format (dynamically configured through DL control information (DCI) or semi-statically / statically configured through radio resource control (RRC) signaling) via the received slot format indicator (SFI). Note that the following description also applies to the 5G / NR frame structure for TDD.

[0046] Other wireless communication technologies can have different frame structures and / or different channels. A frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe can include one or more time slots. A subframe can also include mini-slots, which can contain 7, 4, or 2 symbols. Each time slot can include 7 or 14 symbols depending on the slot configuration. For a slot configuration 0, each time slot can include 14 symbols, and for a slot configuration 1, each time slot can include 7 symbols. The symbols on the DL can be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL can be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT)-spread-OFDM (DFT-s-OFDM) symbols (also known as single-carrier frequency division multiple access (SC-FDMA) symbols) (for power-limited scenarios; limited to single-stream transmission). The number of time slots within a subframe is based on the slot configuration and the numerology. For a slot configuration 0, different numerologies (μ) 0 to 4 allow 1, 2, 4, 8, and 16 time slots per subframe, respectively. For a slot configuration 1, different numerologies 0 to 2 allow 2, 4, and 8 time slots per subframe, respectively. Accordingly, for a slot configuration 0 and a numerology μ, there are 14 symbols per time slot and 2 μ time slots per subframe. The subcarrier spacing and the symbol length / duration are a function of the numerology. The subcarrier spacing can equal 2μ* 15 kHz, where μ is the numerology 0 to 4. Thus, a numerology μ = 0 has a subcarrier spacing of 15 kHz, and a numerology μ = 4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D An example of a slot configuration 0 with 14 symbols per time slot and 4 time slots per subframe and a numerology μ = 2 is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μβ. Within a frame set, there can be one or more different bandwidth parts (BWPs) that are frequency division multiplexed (see Figure 2B ). Each BWP can have a particular numerology.

[0047] A resource grid can be used to represent the frame structure. Each time slot includes resource blocks (RBs) (also referred to as physical RBs (PRBs)) that extend for the full duration of the time slot in the frequency domain. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0048] As explained in Figure 2A , some of the REs carry reference (pilot) signals (RS) for the UE. The RS can include demodulation RS (DM-RS) (indicated as R xwhere 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS). The RS can also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0049] Figure 2B An example of various DL channels are illustrated with reference to a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine RE groups (REGs), each REG including four consecutive REs in an OFDM symbol. A PDCCH within one BWP can be referred to as a control resource set (CORESET). Additional BWPs can be located at higher and / or lower frequencies across the carrier bandwidth. A primary synchronization signal (PSS) can be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe / symbol timing and physical layer identity. A secondary synchronization signal (SSS) can be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine locations of the aforementioned DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB) that provides system bandwidth configuration and scheduling information, can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information such as system information blocks (SIBs), and paging messages.

[0050] As illustrated in Figure 2C some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS can be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS can be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and on the particular PUCCH format used. The UE can transmit sounding reference signals (SRS). The SRS can be transmitted in the last symbol of a subframe. The SRS can have a comb- structure, and the UE can transmit SRS on one of the combs. The SRS can be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0051] Figure 2D An example of various UL channels within a subframe of a TDD frame is illustrated. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data, and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0052] Figure 3 is a block diagram of the components of base station 310 and UE 350, which are in communication over access network 320. In the DL, IP packets from the core network 160 can be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration

[0053] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, can include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping to physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols can then be split into parallel streams. Each stream can then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 can be used to determine the coding and modulation schemes, as well as for spatial processing. The channel estimate can be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream can then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX can modulate an RF carrier with a respective spatial stream for transmission.

[0054] At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. The soft decisions can be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0055] The controller / processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 can be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0056] Similar to the functionality described in connection with the DL transmission by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0057] Channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the base station 310 can be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 can be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX can modulate an RF carrier with a respective spatial stream for transmission.

[0058] The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0059] The controller / processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 can be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from UE 350. IP packets from the controller / processor 375 can be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0060] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 can be configured to perform aspects in connection with the BFD / BFR requester component 198. Figure 1

[0061] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 can be configured to perform aspects in connection with the BFD / BFR indicator component 199. Figure 1

[0062] Wireless communication systems can be configured to share available system resources and provide various telecommunication services (e.g., telephony, video, data, messaging, broadcasts, etc.) based on multiple access technologies that support communications with multiple users, such as CDMA systems, TDMA systems, FDMA systems, OFDMA systems, SC-FDMA systems, TD-SCDMA systems, etc. In many cases, common protocols that facilitate communications with wireless devices are adopted in various telecommunication standards. For example, communication methods associated with eMBB, mMTC, and URLLC can be incorporated into 5G NR telecommunication standards, while other aspects can be incorporated into 4G LTE standards. As mobile broadband technology is part of an ongoing evolution, further improvements in mobile broadband are still useful and can be applied to continue development of such technologies.

[0063] Figure 4 ​​is a call flow diagram 400 illustrating communications between a UE 402 and a base station 404. At 406, the UE 402 can transmit a request to the base station 404 for a set of beams for beam failure detection (BFD). Additionally or alternatively, the request transmitted to the base station 404 at 406 can include a request for a set of candidate beams for beam failure recovery (BFR). The request from the UE 402 to the base station 404 can be transmitted on any of a PUCCH, a PUSCH, or a random access channel (RACH). In some configurations, all of the requested beams in the set of beams can be associated with a same cell. For example, all of the beams in the set of beams can be associated with a cell of the base station 404, or all of the beams in the set of beams can be associated with a second cell of a second base station. In other configurations, some of the requested beams in the set of beams can be associated with different cells. For example, a first beam in the set of beams can be associated with a cell of the base station 404, and a second beam in the set of beams can be associated with a second cell of a second base station.

[0064] At 407, the base station 404 can determine a set of beams for BFD and / or a set of candidate beams for BFR. For example, the base station 404 can grant / authorize all or a subset of the set of beams for BFD and / or the set of candidate beams for BFR requested by the UE 402 at 406. At 408, the UE 402 can receive an indication of whether the base station 404 authorized use of the set of beams for BFD and / or the set of beams for BFR requested by the UE 402. For example, the grant of the set of beams corresponding to the transmitted request can be indicated to the UE 402 from the base station 404 at 408 through RRC configuration.

[0065] At 410, the UE 402 can measure a beam in the requested set of beams for BFD. At 412, if the measurement is less than a quality threshold, the UE 402 can increment a beam failure indicator (BFI) counter. At 414, if the BFI counter is equal to or greater than a maximum count, the UE 402 can measure a candidate beam in the requested set of candidate beams for BFR. Otherwise, the UE 402 can reset the BFI counter based on expiration of a BFD timer. At 416, if the measurement of the candidate beam is greater than a second quality threshold, the UE 402 can perform a RACH procedure with the base station 404 based on the candidate beam. Otherwise, the UE 402 can perform an initial acquisition procedure after expiration of the BFD timer.

[0066] Figure 5A diagram 500 illustrating the BFD procedure and the beam failure recovery (BFR) procedure is shown. The BFD / BFR procedure can be performed in a non-discontinuous reception (non-DRX) mode for a primary cell (Pcell) and / or a primary secondary cell (PScell). A UE wirelessly connected to a base station can be configured with two sets of RS (e.g., a q0 set and a q1 set) for measuring signals from the base station. The q0 set can be configured for BFD and can be based on one or more of CSI-RS and / or SSB used to perform initial measurements. Utilizing CSI-RS and / or SSB to measure signals from the base station can be configurable by the base station to the UE.

[0067] The UE can perform measurements for the q0 set over a predetermined measurement period associated with a BFD timer (e.g., beamFailureDetectionTimer). If during the measurement period, the UE determines that the layer 1 measurement values for RS in the q0 set are below a threshold (e.g., Q 输出，LR ), the UE can increment a BFI counter (e.g., BFI_COUNTER). For example, if two RS in the q0 set are determined to be below the threshold, the BFI counter can be incremented from 0 to 1. If the measurements for all beams in the q0 set are less than Q 输出,LR , the UE can report to a higher layer based on a maximum periodicity (e.g., at least 2 ms CSI-RS / SSB periodicity). Along with incrementing the BFI counter, the UE can initiate the BFD timer. For each report to the higher layer, the BFI counter can be incremented and the BFD timer can be started / restarted. The BFD timer can be set for a pre-defined interval. If the BFD timer expires and the BFI counter is not incremented to a maximum count number (e.g., 2 counts), the BFD timer and the BFI counter can be reset as the measurement values for one RS in the q0 set can be above the threshold.

[0068] If during a subsequent measurement period, two RS in the q0 set are determined to be below a threshold (e.g., Q 输出，LR ) within the same interval of the BFD timer, the BFI counter can be incremented. In examples, a maximum count of the BFI counter (e.g., beamFailureInstanceMaxCount) can be equal to 2. If the maximum count is reached within the BFD timer interval, the UE can determine that a beam failure has occurred (e.g., two beams in the q0 set are measured below a threshold measurement value for a number of repeated instances corresponding to the maximum count), which can trigger a BFR and / or a random access channel (RACH) procedure.

[0069] A BFR timer (e.g., beamFailureRecoveryTimer) can be initiated while the UE attempts to perform recovery via another RS included in a set of candidate beams (q1) for recovery. The UE can measure beams in the q1 set and report to higher layers beams above a Q 输入，LR threshold. The q1 set can likewise be configured to the UE and can correspond to another set of RSs (e.g., a set of CSI-RSs and / or SSBs). In some examples, RSs from the q0 set can be included in the q1 set. In other examples, RSs in the q1 set can be different from RSs in the q0 set. The UE can scan candidate beams in the q1 set based on the BFR timer initiated upon detecting beam failure. If any candidate beam associated with the q1 set is detected above a layer 1 measurement threshold, the UE can initiate a contention-free RACH / physical random access channel (PRACH) procedure for that candidate beam. The RACH can be transmitted to the base station to indicate that BFD has occurred with respect to the q0 set, but the UE can continue to communicate with the base station based on candidate beams in the q1 set (e.g., q 新 ).

[0070] A timer for a random access (RA) response window can be initiated four slots after the UE transmits the RACH. If the base station identifies the RACH from the UE on a beam, the base station can transmit a PDCCH / PDSCH on a predefined resource monitored by the UE. An acknowledgement (ACK) / negative acknowledgement (NACK) from the base station in response to the RACH can indicate whether the UE can recover communication with the base station with a beam in the q1 set. If communication is recovered, the beam failure can be determined by the UE to be recovered.

[0071] Scanning the q1 set, transmitting the RACH, receiving an ACK from the base station, etc. can all occur within the BFR timer interval. If the BFR timer expires before such procedures are completed, the BFR can be unsuccessful, and the UE can determine that a radio link failure (RLF) has occurred. Thus, the UE can perform an initial acquisition procedure to acquire a new connection by locating an SSB, transmitting a RACH, etc., where the q0 set, the q1 set, the maximum count, the BFD timer, the BFR timer, the RA response window, the Q 输出 / Q 输入 , etc. can again be signaled / configured to the UE by the base station based on a bandwidth part (BWP) serving the UE.

[0072] For functionally reduced devices, including stationary devices (e.g., industrial wireless sensors) or rotating devices (e.g., video monitoring devices), and for non-functionally reduced devices, temporary or permanent obstructions to a serving beam can prevent such devices from receiving information on the serving beam. For rotating devices / UEs that receive different beams in a circular manner as the device / UE moves / rotates, the UE can determine the interference pattern based on such movement. Accordingly, the UE can be configured to determine whether a first set of RSs (e.g., a qO set, a ql set, or some other set) indicates an improved signal quality for a second set of RSs. As a result, the UE can indicate the determined (e.g., suitable) set of RSs to the base station.

[0073] In an example, the UE’s location can correspond to two different cells, such that the UE can not detect beams of a first cell (e.g., located at 90 degrees), but can detect beams of a second cell (e.g., located at 0 degrees). If the UE is currently utilizing the first cell, which can be associated with an obstruction, the UE can indicate to the network, based on internal measurements at the UE, that utilizing the second cell can be a suitable replacement for utilizing the first cell. Accordingly, the network can configure the UE with a ql set associated with the second cell for performing a BFR procedure.

[0074] The UE can send a request to the base station including a suitable list of qO set(s) to be used for BFD and / or a suitable list of ql set(s) to be used for candidate recovery beams. Although the UE can not have control over whether the UE is configured with certain sets of RSs, the UE can still communicate to the base station a suitable list of RS sets that the base station can or can not grant. If the base station grants the request, the UE can be configured with all or a portion of the requested list(s) using RRC. The UE’s requested list(s) can be communicated to the base station on PUCCH (e.g., a layer 1 message), PUSCH (e.g., a MAC-CE), or RACH. In aspects, a set of RSs can be configured for only one cell, or the set of RSs can be configured across different cells. For example, the UE can communicate a request including a suitable list of sets of RSs (which can be for the same cell or across different cells) such that BFR can be performed similarly for the same cell or across different cells.

[0075] Figure 6 FIG. 6 is a flow diagram 600 of a method of wireless communication. The method can be performed by a UE 104, which can include the memory 360 and which can be the entire UE 104 or a component of the UE 104, such as the TX processor 368, the RX processor 356, and / or the controller / processor 359.

[0076] At 602, the UE can transmit, to a base station, a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery. For example, with reference to Figure 4 At 406, the UE 402 can transmit a request for both beam sets for BFD and candidate beam sets for BFR. The request can be transmitted (e.g., at 406) over one of a PUCCH, a PUSCH, or a RACH. The beam sets for beam failure detection (e.g., requested at 406) can be associated with one of one cell of the base station 404, or multiple cells of a set of base stations including the base station 404. Similarly, the candidate beam sets for beam failure recovery (e.g., requested at 406) can be associated with one of one cell of the base station 404, or multiple cells of a set of base stations including the base station 404.

[0077] At 604, the UE can receive, from the base station based on the transmitted request, information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery. For example, with reference to Figure 4 At 406, the UE 402 can receive, from the base station 404 based on the transmitted request, an indication of beam sets for BFD and beam sets for BFR. The information received by the UE 402 at 408 can be received through RRC configuration.

[0078] At 606, the UE can measure, based on the transmitted request, each beam of the beam sets for beam failure detection relative to a quality threshold Q 输出，LR For example, with reference to Figure 5 The beams in the q0 set can be measured for BFD based on a comparison of the measured values of the beams in the q0 set to the measurement / quality threshold.

[0079] At 608, the UE can increment a BFI counter (BFI_COUNTER) based on a determination that each measurement is less than the quality threshold Q 输出，LR For example, with reference to Figure 5 For each measured value of a beam in the q0 set that is determined to be less than the measurement / quality threshold, the BFI counter can be incremented from 0 to 1, from 1 to 2, and so on.

[0080] At 610, the UE can reset the BFI_COUNTER based on an expiration of a beam failure detection timer (beamFailureDetectionTimer). For example, with reference to Figure 5 When the BFD timer expires, the BFI counter can be reset from 1 to 0.

[0081] ​At 612, the UE may, when the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount), determine the quality of the transmitted request relative to the second quality threshold Q 输入，LR The candidate beam set for beam failure recovery is measured For example, refer to Figure 5 , if the BFI counter increments to a maximum count of 2, the UE may measure the candidate beams in the q1 set to determine whether a second measurement value of the candidate beam exceeds a second measurement / quality threshold for BFR.

[0082] At 614, the UE may associate the candidate beam set for beam failure recovery with the For example, refer to Figure 5 If the second measurement value is greater than the second measurement / quality threshold, the UE may initiate a RACH procedure for the candidate beams in the q1 set.

[0083] At 616, the UE may, within a beam failure recovery timer (beamFailureRecoveryTimer), determine that the corresponding measurement for one of the one or more beams is greater than the second quality threshold Q. 输入，LR The RACH procedure is performed on this beam. Figure 5 , when the second measurement value is greater than the second measurement / quality threshold, the RACH procedure can be performed on the beams in the q1 set before the BFR timer expires.

[0084] Figure 7 700 is a flow chart of a method of wireless communication. The method may be performed by base station 102, which may include memory 376 and which may be the entire base station 102 or a component of base station 102 (such as TX processor 316, RX processor 370, and / or controller / processor 375).

[0085] At 702, the base station may receive a request from a UE for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery. Figure 4At 406, the base station 404 can receive a request for both a set of beams for BFD and a set of candidate beams for BFR. The request can be received (e.g., at 406) over one of a PUCCH, a PUSCH, or a RACH. The set of beams for beam failure detection (e.g., requested at 406) can be associated with one of: one cell of the base station 404, or multiple cells of a set of base stations, including the base station 404. Similarly, the set of candidate beams for beam failure recovery (e.g., requested at 406) can be associated with one of: one cell of the base station 404, or multiple cells of a set of base stations, including the base station 404.

[0086] At 704, the base station can determine the set of beams for beam failure detection and the set of candidate beams for beam failure recovery based on the request received from the UE. For example, with reference to Figure 4 At 407, the base station 404 can determine the set of beams for BFD and the set of beams for BFR based on the request received from the UE 402 at 406.

[0087] At 706, the base station can transmit, to the UE based on the received request, information indicating the set of beams for beam failure detection and the set of candidate beams for beam failure recovery. For example, with reference to Figures 4 to 5 At 408, the base station 404 can transmit, to the UE 402 based on the request received at 406, an indication of the set of beams for BFD and the set of beams for BFR. The information transmitted from the base station at 408 can be transmitted through RRC configuration. In aspects, each beam of the set of beams for beam failure detection may be measured relative to a quality threshold Q 输出，LR For example, in diagram 500, the beams of the q0 set can be measured for BFD based on a comparison of the measured values of the beams of the q0 set to the measurement / quality threshold. A BFI counter (BFI_COUNTER) can be incremented based on each measurement determined to be less than the quality threshold Q 输出，LR For example, in diagram 500, the BFI counter can be incremented from 0 to 1, from 1 to 2, and so on, for each measured value of the beams of the q0 set determined to be less than the measurement / quality threshold. The BFI_COUNTER can be reset based on expiration of a beam failure detection timer (beamFailureDetectionTimer). For example, in diagram 500, the BFI counter can be reset from 1 to 0 when the BFD timer expires.

[0088] In further aspects, one or more beams in the candidate beam set for beam failure recovery can be measured relative to a second quality threshold Q 输入，LR For example, in diagram 500, if the BFI counter increments to the maximum count of 2, the UE can measure the candidate beams in the q1 set to determine whether the second measurement values of the candidate beams exceed a second measurement / quality threshold for BFR. The RACH procedure can be initiated in association with the candidate beam set for beam failure recovery For example, in diagram 500, if the second measurement values are greater than the second measurement / quality threshold, the UE can initiate the RACH procedure for the candidate beams in the q1 set. Within a beam failure recovery timer (beamFailureRecoveryTimer), the RACH procedure can be performed for one of the one or more beams based on a corresponding measurement for the one beam being greater than the second quality threshold Q 输入，LR For example, in diagram 500, the RACH procedure can be performed for the beams in the q1 set prior to expiration of the BFR timer when the second measurement values are greater than the second measurement / quality threshold.

[0089] Figure 8 ​is a diagram of an example of a hardware implementation for the exemplary apparatus 802. The apparatus 802 is a UE and includes a cellular baseband processor 804 (also referred to as a modem) coupled with a cellular RF transceiver 822 and one or more subscriber identity modules (SIM) cards 820, an application processor 806 coupled with a secure digital (SD) card 808 and a screen 810, a Bluetooth module 812, a wireless local area network (WLAN) module 814, a Global Positioning System (GPS) module 816, and a power supply 818. The cellular baseband processor 804 communicates with the UE 104 and / or BS 102 / 180 by way of the cellular RF transceiver 822. The cellular baseband processor 804 can include a computer-readable medium / memory. The computer-readable medium / memory can be non-transitory. The cellular baseband processor 804 is Figure 3 responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 804, causes the cellular baseband processor 804 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data that is manipulated by the cellular baseband processor 804 when executing software. The cellular baseband processor 804 further includes a reception component 830, a communication manager 832, and a transmission component 834. The communication manager 832 includes the one or more illustrated components. The components of the communication manager 832 can be stored in the computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 804. The cellular baseband processor 804 can be a component of the UE 350 and can include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 802 can be a modem chip and include only the baseband processor 804, and in another configuration, the apparatus 802 can be an entire UE (e.g., see 350) and include the aforementioned additional modules of the apparatus 802.

[0090] The communication manager 832 includes a measuring component 840 that is configured to measure, based on the transmitted request, each beam of a set of beams for beam failure detection relative to a quality threshold and, when the BFI counter is greater than or equal to a maximum count of beam failure instances, measure, based on the transmitted request, one or more beams of a set of candidate beams for beam failure recovery relative to a second quality threshold, e.g., as described in connection with 606 and 612. The communication manager 832 further includes an incrementing component 842 that is configured to increment the BFI counter based on a determination that each measurement is less than the quality threshold, e.g., as described in connection with 608. The communication manager 832 further includes a resetting component 844 that is configured to reset the BFI counter based on an expiration of a beam failure detection timer, e.g., as described in connection with 610. The communication manager 832 further includes an initiating component 846 that is configured to initiate a RACH procedure in association with the set of candidate beams for beam failure recovery, e.g., as described in connection with 614. The communication manager 832 further includes a performing component 848 that is configured to perform, within a beam failure recovery timer, the RACH procedure for one of the one or more beams based on a corresponding measurement for the one beam being greater than the second quality threshold, e.g., as described in connection with 616.

[0091] The reception component 830, e.g., as described in connection with 604, is configured to receive, based on the transmitted request, information from the base station indicating the set of beams for beam failure detection and the set of candidate beams for beam failure recovery. The transmission component 834, e.g., as described in connection with 602, is configured to transmit, to the base station, a request for a list of sets of beams for beam failure detection and a list of sets of candidate beams for beam failure recovery.

[0092] The apparatus can include additional components that perform each of the functions Figure 6 of the aforementioned flowcharts. As such, Figure 6 Each block of the aforementioned flowcharts can be performed by a component and the apparatus can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

[0093] In one configuration, the device 802 (and in particular the cellular baseband processor 804) includes: means for transmitting a request to a base station for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; and means for receiving information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery from the base station based on the transmitted request. The device 802 further includes: means for selecting, based on the transmitted request, a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery relative to a quality threshold Q 输出，LR The beam set used for beam failure detection is measured means for determining, based on the quality threshold Q, that the beam is less than the quality threshold Q 输出，LR means for incrementing a BFI counter (BFI_COUNTER) for each measurement of the beam failure detection timer (beamFailureDetectionTimer); and means for resetting the BFI_COUNTER based on the expiration of the beam failure detection timer (beamFailureDetectionTimer). The apparatus 802 further includes means for resetting the BFI_COUNTER based on the transmitted request relative to a second quality threshold Q when the BFI_COUNTER is greater than or equal to a beam failure instance maximum count (beamFailureInstanceMaxCount). 输入，LR The candidate beam set for beam failure recovery is measured means for selecting one or more beams in a candidate beam set for beam failure recovery; and and a device for initiating a RACH procedure in association with the one or more beams; ... 输入，LR The device performs the RACH procedure for the one beam.

[0094] The aforementioned means may be one or more of the aforementioned components in the device 802 configured to perform the functions recited by the aforementioned means. As described above, the device 802 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0095] Figure 9FIG. 9 is a diagram 900 that is an example of a hardware implementation for the explaining apparatus 902. The apparatus 902 is a BS and includes a baseband unit 904. The baseband unit 904 can communicate with the UE 104 through a cellular RF transceiver 922. The baseband unit 904 can include a computer- readable medium / memory. The baseband unit 904 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the baseband unit 904, causes the baseband unit 904 to perform the various functions described supra. The computer-readable medium / memory can also be used for storing data manipulated by the baseband unit 904 when executing software. The baseband unit 904 further includes a reception component 930, a communication manager 932, and a transmission component 934. The communication manager 932 includes the one or more illustrated components. The components of the communication manager 932 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband unit 904. The baseband unit 904 can be a component of the BS 310 and can include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0096] The communication manager 932 includes a determining component 940 configured to determine, based on a request received from the UE, the set of beams for beam failure detection and the set of candidate beams for beam failure recovery, e.g., as described in connection with 704. The reception component 930, e.g., as described in connection with 702, is configured to receive, from a UE, a request for a list of sets of beams for beam failure detection and a list of sets of candidate beams for beam failure recovery. The transmission component 934, e.g., as described in connection with 706, is configured to transmit, to the UE based on the received request, information indicating the set of beams for beam failure detection and the set of candidate beams for beam failure recovery.

[0097] The apparatus can include additional components that perform each of the functions Figure 7 of the aforementioned flowcharts. As such, Figure 7 Each block of the aforementioned flowcharts can be performed by a component and the apparatus can include one or more of those components. The components can be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by a processor configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

[0098] In one configuration, the apparatus 902 (and in particular the baseband unit 904) includes means for receiving, from a UE, a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery and means for transmitting, to the UE based on the received request, information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery. The apparatus 902 further includes means for determining the beam sets for beam failure detection and the candidate beam sets for beam failure recovery based on a request received from the UE.

[0099] The aforementioned means can be one or more of the aforementioned components of the apparatus 902 configured to perform the functions recited by the aforementioned means. As described supra, the apparatus 902 can include the TX Processor 316, the RX Processor 370, and the controller / processor 375. As such, in one configuration, the aforementioned means can be the TX Processor 316, the RX Processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0100] Accordingly, a UE can be configured to determine that reception of information on a serving beam is obstructed (e.g., by a temporary or permanent obstruction) but that a different beam, such as a beam outside of a set of RS beams, can be a suitable replacement for the serving beam based on movement, rotation, interference patterns, etc. As such, the UE can send a request to a base station including a suitable list of sets of RS beams to be used for BFD and / or BFR. If the base station grants the UE to utilize the requested beams in the list based on the transmitted request, the base station can configure the UE based on all or a portion of the requested list. The requested list can include beams associated with the same cell (e.g., a Pcell or a PScell) or the requested list can include a subset of beams associated with different cells.

[0101] It should be understood that the particular order or hierarchy of various blocks of the disclosed process / method steps / flow charts represents an example approach. Based on design preferences, it is understood that the particular order or hierarchy of various blocks of the disclosed process / method steps / flow charts can be re-arranged, or that some blocks can be combined or omitted. The various blocks of the attached flow charts are presented in example order of execution. It is understood that the various blocks of the attached flow charts can be executed in a different order, or that some blocks can be combined or omitted.

[0102] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more." Terms such as "if," "when," and "while" should be interpreted to mean "under the condition that" rather than imply a direct, temporal relationship between events. That is, these phrases simply identify circumstances when one event will or will not occur or be performed, which can or can not be directly or indirectly related in time or order of occurrence with regards to one another. Use of the term "example" in the context of a description of example aspects, applications, or embodiments, means "serving as an example, instance, or illustration." Any aspect described herein as "example" is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of the group consisting of A, B, and C," "one or more of the group consisting of A, B, and C," and "A, B, and / or C or any combination thereof" include number one only of A, number two only of A, number one and number two, or more than one, of A; number one only of B, number two only of B, number one and number two, or more than one, of B; number one only of C, number two only of C, number one and number two, or more than one, of C; or any combination thereof. Specifically, the combinations such as "at least one of A, B or C," "one or more of A, B or C," "at least one of the group consisting of A, B and C," "one or more of the group consisting of A, B and C," and "A, B, and / or C or any combination thereof" can be A only, B only, C only, both A and B, both A and C, both B and C, or both A and B and C, where any of A, B, and C can include one or more members. Elements of various aspects described herein can be combined, substituted, or omitted for any of the various aspects of the disclosure as is apparent to a person of ordinary skill in the art, in light of the disclosure. Further, any aspects disclosed herein are not intended to be sacrificed to public under the doctrine of equivalents, whether or not expressly stated herein. The words "module," "mechanism," "element," "device," and the like can not be a substitute for the word "means" plus function unless the phrase "means for" is expressly recited. Accordingly, no element of any claims is intended to be interpreted, absent a specific recitation, as means-plus-function.

[0103] The following aspects are illustrative only and can be combined with other aspects or teachings described herein without limitation.

[0104] Aspect 1 is a method for wireless communication at a UE, the method comprising: transmitting a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery to a base station; and receiving information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery from the base station based on the transmitted request.

[0105] Aspect 2 may be combined with aspect 1 and include: the request being transmitted via one of PUCCH, PUSCH or RACH.

[0106] Aspect 3 can be combined with any one of aspects 1-2 and include: the information is received through RRC configuration.

[0107] Aspect 4 can be combined with any of aspects 1-3 and include: the beam set for beam failure detection is associated with one of the following: a cellular cell of the base station, or multiple cellular cells of a set of base stations, the set of base stations including the base station.

[0108] Aspect 5 can be combined with any one of aspects 1-4 and include: the candidate beam set for beam failure recovery is associated with one of the following: a cellular cell of the base station, or multiple cellular cells of a set of base stations, the set of base stations including the base station.

[0109] Aspect 6 can be combined with any one of aspects 1-5 and further comprises: based on the transmitted request, relative to a quality threshold Q 输出，LR The beam set used for beam failure detection is measured Each beam in; Based on the quality threshold Q 输出，LR The BFI counter (BFI_COUNTER) is incremented for each measurement of the beam; and the BFI_COUNTER is reset based on the expiration of the beam failure detection timer (beamFailureDetectionTimer).

[0110] Aspect 7 can be combined with any one of aspects 1-6 and further comprises: when the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount), based on the transmitted request relative to the second quality threshold Q 输入，LR The candidate beam set for beam failure recovery is measured One or more beams in; and the candidate beam set for beam failure recovery Initiate a RACH procedure in association; and within a beam failure recovery timer (beamFailureRecoveryTimer), based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q输入，LR and performing the RACH procedure for the one beam.

[0111] Aspect 8 is a method of wireless communication at a base station, comprising: receiving, from a UE, a request for a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; and transmitting, to the UE based on the received request, information indicating the beam sets for beam failure detection and the candidate beam sets for beam failure recovery.

[0112] Aspect 9 can be combined with aspect 8 and further includes determining the beam sets for beam failure detection and the candidate beam sets for beam failure recovery based on the request received from the UE.

[0113] Aspect 10 can be combined with any of aspects 8-9 and includes the request being received through one of a PUCCH, a PUSCH, or a RACH.

[0114] Aspect 11 can be combined with any of aspects 8-10 and includes the information being transmitted through RRC configuration.

[0115] Aspect 12 can be combined with any of aspects 8-11 and includes the beam sets for beam failure detection being associated with one of one cell of the base station, or multiple cells of a set of base stations, the set of base stations including the base station.

[0116] Aspect 13 can be combined with any of aspects 8-12 and includes the candidate beam sets for beam failure recovery being associated with one of one cell of the base station, or multiple cells of a set of base stations, the set of base stations including the base station.

[0117] Aspect 14 can be combined with any of aspects 8-13 and includes the beam sets for beam failure detection each beam of the beam sets for beam failure detection being measured relative to a quality threshold Q 输出，LR , a BFI counter (BFI_COUNTER) being incremented based on each measurement determined to be less than the quality threshold Q 输出，LR , and the BFI_COUNTER being reset based on expiration of a beam failure detection timer (beamFailureDetectionTimer).

[0118] Aspect 15 can be combined with any of aspects 8-14 and includes the candidate beam sets for beam failure recovery when the BFI_COUNTER is greater than or equal to a beam failure instance maximum count (beamFailureInstanceMaxCount) One or more beams in the 输入 , LR The measurement, RACH procedure and the candidate beam set for beam failure recovery is initiated in association with the beam failure recovery timer and is based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q within the beam failure recovery timer. 输入，LR The RACH procedure is performed on the one beam.

[0119] Aspect 16 is an apparatus for wireless communication, the apparatus comprising at least one processor coupled to a memory and configured to implement the method of any one of aspects 1-15.

[0120] The apparatus of clause 17, further comprising a transceiver coupled to the at least one processor.

[0121] Aspect 18 is an apparatus for wireless communication, comprising means for implementing the method of any one of aspects 1-15.

[0122] Aspect 19 is a non-transitory computer-readable medium storing computer-executable code, which, when executed by at least one processor, causes the at least one processor to implement the method of any one of aspects 1-15.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: transmitting a request, the request including a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; as well as Information indicating the beam set for beam failure detection and the candidate beam set for beam failure recovery is received based on the transmitted request.

2. The method according to claim 1, wherein The request is transmitted via one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a random access channel (RACH).

3. The method according to claim 1, wherein The beam set used for beam failure detection is associated with one of: a cell of a base station or a plurality of cells of a set of base stations, the set of base stations including the base station.

4. The method according to claim 1, wherein The candidate beam set for beam failure recovery is associated with one of: a cell of a base station, or a plurality of cells of a set of base stations, the set of base stations including the base station.

5. The method of claim 1, further comprising: Based on the transmitted request, relative to the quality threshold Q 输出，LR The beam set used for beam failure detection is measured Each beam in Based on the determination that the quality is less than the quality threshold Q 输出，LR Incrementing a beam fault indicator (BFI) counter (BFI_COUNTER) for each measurement of ; and The BFI_COUNTER is reset based on the expiration of the beam failure detection timer (beamFailureDetectionTimer).

6. The method of claim 5, further comprising: When the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount), based on the transmitted request relative to the second quality threshold Q 输入，LR The candidate beam set for beam failure recovery is measured One or more beams in and the candidate beam set for beam failure recovery initiating a random access channel (RACH) procedure in association; and Within a beam failure recovery timer (beamFailureRecoveryTimer), based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q 输入，LR The RACH procedure is performed on the one beam.

7. A method for wireless communication at a network node, comprising: receiving a request including a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; as well as Information indicating the beam set for beam failure detection and the candidate beam set for beam failure recovery is transmitted based on the received request.

8. The method of claim 7, further comprising: The beam set for beam failure detection and the candidate beam set for beam failure recovery are determined based on the received request.

9. The method of claim 7, wherein: The request is received via one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a random access channel (RACH).

10. The method of claim 7, wherein: The beam set used for beam failure detection is associated with one of: a cell of a base station or a plurality of cells of a set of base stations, the set of base stations including the base station.

11. The method according to claim 7, wherein: The candidate beam set for beam failure recovery is associated with one of: a cell of a base station, or a plurality of cells of a set of base stations, the set of base stations including the base station.

12. The method of claim 7, wherein: The beam set for beam failure detection Each beam in the 输出，LR The beam failure indicator (BFI) counter (BFI_COUNTER) is determined to be less than the quality threshold Q 输出，LR The BFI_COUNTER is incremented for each measurement and is reset based on the expiration of the beam failure detection timer (beamFailureDetectionTimer).

13. The method of claim 12, wherein: The candidate beam set for beam failure recovery when the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount) One or more beams in the 输入，LR The random access channel (RACH) procedure is used to measure the candidate beam set for beam failure recovery. is initiated in association with the beam failure recovery timer and is based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q within a beam failure recovery timer. 输入 , LR performs the RACH procedure on the one beam.

14. An apparatus for wireless communication at a user equipment (UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: transmitting a request, the request including a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; as well as Information indicating the beam set for beam failure detection and the candidate beam set for beam failure recovery is received based on the transmitted request.

15. The apparatus of claim 14, wherein: The request is transmitted via one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a random access channel (RACH).

16. The apparatus of claim 14, wherein: The information is received via a radio resource control (RRC) configuration.

17. The apparatus of claim 14, wherein: The beam set used for beam failure detection is associated with one of: a cell of a base station or a plurality of cells of a set of base stations, the set of base stations including the base station.

18. The apparatus of claim 14, wherein: The candidate beam set for beam failure recovery is associated with one of: a cell of a base station, or a plurality of cells of a set of base stations, the set of base stations including the base station.

19. The apparatus of claim 14, wherein the at least one processor is further configured to: Based on the transmitted request, relative to the quality threshold Q 输出，LR The beam set used for beam failure detection is measured Each beam in Based on the determination that the quality is less than the quality threshold Q 输出，LR Incrementing a beam fault indicator (BFI) counter (BFI_COUNTER) for each measurement of ; and The BFI_COUNTER is reset based on the expiration of the beam failure detection timer (beamFailureDetectionTimer).

20. The apparatus of claim 19, wherein the at least one processor is further configured to: When the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount), based on the transmitted request relative to the second quality threshold Q 输入，LR The candidate beam set for beam failure recovery is measured One or more beams in and the candidate beam set for beam failure recovery initiating a random access channel (RACH) procedure in association; and Within a beam failure recovery timer (beamFailureRecoveryTimer), based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q 输入，LR The RACH procedure is performed on the one beam.

21. The apparatus of claim 14, further comprising a transceiver coupled to the at least one processor.

22. An apparatus for performing wireless communication at a network node, comprising: Memory; as well as at least one processor coupled to the memory and configured to: receiving a request including a list of beam sets for beam failure detection and a list of candidate beam sets for beam failure recovery; as well as Information indicating the beam set for beam failure detection and the candidate beam set for beam failure recovery is transmitted based on the received request.

23. The apparatus of claim 22, further comprising: The beam set for beam failure detection and the candidate beam set for beam failure recovery are determined based on the received request.

24. The apparatus of claim 22, wherein: The request is received via one of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a random access channel (RACH).

25. The apparatus of claim 22, wherein: The information is conveyed via Radio Resource Control (RRC) configuration.

26. The apparatus of claim 22, wherein: The beam set used for beam failure detection is associated with one of: a cell of a base station or a plurality of cells of a set of base stations, the set of base stations including the base station.

27. The apparatus of claim 22, wherein: The candidate beam set for beam failure recovery is associated with one of: a cell of a base station, or a plurality of cells of a set of base stations, the set of base stations including the base station.

28. The apparatus of claim 22, wherein: The beam set for beam failure detection Each beam in the 输出，LR The beam failure indicator (BFI) counter (BFI_COUNTER) is determined to be less than the quality threshold Q 输出，LR The BFI_COUNTER is incremented for each measurement and is reset based on the expiration of the beam failure detection timer (beamFailureDetectionTimer).

29. The apparatus of claim 28, wherein The candidate beam set for beam failure recovery when the BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount) One or more beams in the 输入，LR The random access channel (RACH) procedure is used to measure the candidate beam set for beam failure recovery. is initiated in association with the beam failure recovery timer and is based on a corresponding measurement of one of the one or more beams being greater than the second quality threshold Q within a beam failure recovery timer. 输入 , LR performs the RACH procedure on the one beam.

30. The apparatus of claim 22, further comprising a transceiver coupled to the at least one processor.

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