Method and apparatus for indicating beam failure of multiple cells

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may detect a beam failure associated with a cell in a plurality of cells. The UE may selectively send a beam failure recovery request (BFRQ) communication for the cell based at least in part on determining whether a threshold time period has passed since a previous BFRQ communication was sent for the cell or another cell in the plurality of cells. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 925,608, filed on October 24, 2019, entitled “INDICATING BEAM FAILURE FOR MULTIPLE CELLS,” and U.S. Non-Provisional Patent Application No. 16 / 949,215, filed on October 20, 2020, entitled “INDICATING BEAM FAILURE FOR MULTIPLE CELLS,” and is hereby expressly incorporated herein by reference. Technical Field

[0003]

[0004] Generally, aspects of the present disclosure relate to wireless communications, and more particularly, to techniques and apparatus for indicating beam failures for multiple cells. Background Art

[0004] Wireless communication systems have been widely deployed to provide a variety of telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BSs), wherein the BSs are capable of supporting communication of multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As further described in detail herein, BSs may be referred to as Node Bs, gNBs, Access Points (APs), Radio Heads, Transmission Reception Points (TRPs), New Radio (NR) BSs, 5G Node Bs, and the like.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a city-wide, national-wide, regional-wide, and even global scale. New Radio (NR) (which may also be referred to as 5G) is an enhancement set of the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, making full use of new spectrum, and using orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple-input multiple-output (MIMO) antenna technology and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there is a need to further improve LTE and NR technologies. Preferably, these improvements should also apply to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: detecting a beam failure associated with a cell among a plurality of cells; and selectively sending a beam failure recovery request (BFRQ) communication to the cell based at least in part on determining whether a threshold time period has passed since a previous BFRQ communication was sent to the cell or another cell among the plurality of cells.

[0008] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: detect a beam failure associated with a cell among a plurality of cells; and selectively send a BFRQ communication for the cell based at least in part on determining whether a threshold time period has passed since a previous BFRQ communication was sent for the cell or another cell among the plurality of cells.

[0009] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more memories of a UE, the one or more processors may be configured to: detect a beam failure associated with a cell among a plurality of cells; and selectively send a BFRQ communication for the cell based at least in part on determining whether a threshold time period has passed since a previous BFRQ communication was sent for the cell or another cell among the plurality of cells.

[0010] In some aspects, an apparatus for wireless communication may include: a unit for detecting a beam failure associated with a cell among multiple cells; and a unit for selectively sending a BFRQ communication to the cell based at least in part on determining whether a threshold time period has passed since a previous BFRQ communication was sent to the cell or another cell among the multiple cells.

[0011] Aspects of the present invention generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices and / or processing systems as fully described herein with reference to the accompanying drawings and descriptions and as illustrated in the accompanying drawings and descriptions.

[0012] In order to better understand the following specific embodiments, the features and technical advantages of the examples according to the present disclosure have been generally summarized to a considerable extent. Additional features and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for the same purpose of performing the present disclosure. These equivalent constructions do not depart from the scope of protection of the attached claims. When considering the following specific embodiments in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein (about their organization and method of operation), and the associated advantages will be better understood. Each of these drawings is provided for illustration and description purposes only, and is not used as a limitation to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to understand the above-described features of the present disclosure in detail, the present application provides a more specific description with reference to some aspects for the above brief summary, some of which are illustrated in the accompanying drawings. However, it should be noted that since the description of the present invention allows for other equivalent effective aspects, these drawings only depict certain typical aspects of the present disclosure, which should not be considered to limit the scope of protection of the present invention. The same reference numerals in different drawings may identify the same or similar elements.

[0014] Figure 1 is a block diagram illustrating an example of a wireless communication network according to various aspects of the present disclosure.

[0015] Figure 2 is a block diagram illustrating an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

[0016] Figure 3A is a block diagram illustrating an example of a frame structure in a wireless communication network in accordance with various aspects of the present disclosure.

[0017] Figure 3Bis a block diagram illustrating an exemplary synchronous communication hierarchy in a wireless communication network in accordance with various aspects of the present disclosure.

[0018] Figure 4 is a block diagram illustrating an exemplary slot format with a normal cyclic prefix in accordance with various aspects of the present disclosure.

[0019] Figure 5 is a diagram illustrating examples associated with indicating beam failure for multiple cells according to various aspects of the present disclosure.

[0020] Figure 6 is a diagram illustrating exemplary processing, for example, performed by a user device, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0021] The following is a more comprehensive description of various aspects of the present disclosure with reference to the accompanying drawings. However, the present disclosure can be implemented in a variety of different forms, which should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, providing these aspects is only to make the present disclosure thorough and complete, and will fully convey the protection scope of the present disclosure to those of ordinary skill in the art. Based on the content of this application, it should be understood by those of ordinary skill in the art that the protection scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, the use of any number of aspects set forth herein can implement a device or can implement a method. In addition, the protection scope of the present disclosure is intended to cover such a device or method, which can be implemented by using other structures, functions, or structures and functions of various aspects of the present disclosure set forth herein, or structures and functions of various aspects of the present disclosure set forth herein that are different from those set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more components of the present invention.

[0022] Some aspects of telecommunication systems are now presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and depicted in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0023] It should be noted that although this document uses terminology commonly associated with 3G and / or 4G wireless technologies to describe aspects of the present invention, various aspects of the present disclosure may also be applicable to communication systems based on other generations (e.g., 5G and beyond, which include NR technology).

[0024] Figure 1 is a diagram showing a wireless network 100 in which various aspects of the present disclosure may be implemented. The wireless network 100 may be an LTE network or some other wireless network (e.g., a 5G or NR network). The wireless network 100 may include a plurality of BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE), and the BS may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmission reception point (TRP), and the like. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term "cell" is used.

[0025] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers), allowing unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area, allowing unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home), allowing restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably.

[0026] In some aspects, the cell need not be stationary, and the geographic area of ​​the cell may move according to the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces (e.g., direct physical connections, virtual networks, etc.) using any appropriate transport network.

[0027] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, a relay base station 110d may communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay base station may also be referred to as a relay BS, a relay station, a relay, or the like.

[0028] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a higher transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0029] The network controller 130 may be coupled to a group of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with these BSs via a backhaul. These BSs may also communicate with each other, for example, directly or indirectly via a wireless backhaul or a wired backhaul.

[0030] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio device), a vehicle-mounted component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0031] Some UEs may be considered as machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node may provide, for example, a connection to a network or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). UE 120 may be included in a housing that houses components of UE 120 (e.g., processor components, memory components, etc.).

[0032] Typically, in a given geographic area, any number of wireless networks can be deployed. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0033] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more side link channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein that are performed by base station 110.

[0034] As indicated above, Figure 1 Other examples can be found in Figure 1 The examples described are different.

[0035] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, where the base station 110 and the UE 120 may be Figure 1 One of the base stations in Figure 1Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0036] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols (if any), and provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog signals, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in further detail below, position coding can be used to generate synchronization signals to transmit other information.

[0037] At the UE 120, antennas 252a to 252r may receive downlink signals from the base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols (if any), and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0038] On the uplink, at the UE 120, a transmit processor 264 may receive data from a data source 262, control information (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.) from a controller / processor 280, and process the data and control information. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted back to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0039] Figure 2The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component may perform one or more techniques associated with indicating beam failure of multiple cells, as described in further detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component may perform or direct e.g. Figure 6 600 and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when the one or more instructions are executed by one or more processors of base station 110 and / or UE 120, the instructions may perform or direct, for example, Figure 6 The operations of process 600 and / or other processes described herein. The scheduler 246 may schedule data transmission by the UE on the downlink and / or uplink.

[0040] In some aspects, the UE 120 may include: means for detecting a beam failure associated with one of the plurality of cells; means for selectively sending a beam failure recovery request (BFRQ) communication for the cell based at least in part on determining whether a threshold time period has elapsed since a previous BFRQ communication was sent for the cell or another cell in the plurality of cells; and the like. In some aspects, these means may include combining Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0041] As indicated above, Figure 2 Other examples can be found in Figure 2 The examples described are different.

[0042] Figure 3AAn exemplary frame structure 300 for frequency division duplex (FDD) in a telecommunication system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a set of Z (Z ≥ 1) subframes (e.g., with indices 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of time slots (e.g., in Figure 3A Each subframe has 2 m time slots, where m is the number scheme used for transmission (e.g., 0, 1, 2, 3, 4, etc.). Each time slot may include a set of L symbol periods. For example, each time slot may include fourteen symbol periods (e.g., Figure 3A ), seven symbol periods, or another number of symbol periods. In the case where a subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices 0 to 2L-1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0043] Although some techniques are described herein in conjunction with frames, subframes, time slots, etc., these techniques may be equally applicable to other types of wireless communication structures, which may be referred to using terms other than "frames," "subframes," "time slots," etc. in 5G NR. In some aspects, a "wireless communication structure" may refer to a communication unit with periodic time limits specified by a certain wireless communication standard and / or protocol. Additionally or alternatively, a wireless communication structure may be used in conjunction with a wireless communication standard and / or protocol. Figure 3A The wireless communication structures shown in FIG.

[0044] In some telecommunications (e.g., NR), a base station may send synchronization signals. For example, a base station may send a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and so on on the downlink for each cell supported by the base station. The UE may use the PSS and SSS for cell search and acquisition. For example, the UE may use the PSS to determine symbol timing, and the UE may use the SSS to determine the physical cell identifier and frame timing associated with the base station. The base station may also send a physical broadcast channel (PBCH). The PBCH may carry certain system information, such as system information that supports initial access of the UE.

[0045] In some aspects, the base station may transmit the PSS, SSS, and / or PBCH according to a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) including multiple synchronization communications (e.g., synchronization signal (SS) blocks), as described below in conjunction with Figure 3B as described.

[0046] Figure 3B FIG. 1 is a block diagram conceptually illustrating an exemplary SS hierarchy, wherein the SS hierarchy is an example of a synchronous communication hierarchy. Figure 3B As shown in FIG. 1 , the SS hierarchy may include an SS burst set, which may include multiple SS bursts (identified as SS burst 0 to SS burst B-1, where B is the maximum number of repetitions of the SS burst that the base station can send). As further shown in the figure, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS -1), where b max_SS -1 is the maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beamformed differently. A wireless node may periodically (e.g., every X milliseconds) send an SS burst, such as Figure 3B In some aspects, SS burst sets may have a fixed or dynamic length (in Figure 3B , shown as Y milliseconds).

[0047] Figure 3B The SS burst set shown in is an example of a synchronous communication set, and other synchronous communication sets can be used in conjunction with the techniques described herein. In addition, Figure 3B The SS block shown in is one example of synchronous communication, and other synchronous communications may be used in conjunction with the techniques described herein.

[0048] In some aspects, the SS block includes resources that carry PSS, SSS, PBCH and / or other synchronization signals (e.g., a third synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS and / or PBCH can be the same on each SS block of the SS burst. In some aspects, a single SS block can be included in an SS burst. In some aspects, the length of the SS block can be at least four symbol periods, where each symbol carries one or more of the PSS (e.g., which occupies one symbol), the SSS (e.g., which occupies one symbol), and / or the PBCH (e.g., which occupies two symbols).

[0049] In some aspects, the symbols of the SS blocks are consecutive, such as Figure 3B In some aspects, the symbols of the SS blocks are non-contiguous. Similarly, in some aspects, one or more SS blocks of an SS burst may be sent in contiguous radio resources (e.g., contiguous symbol periods) during one or more time slots. Additionally or alternatively, one or more SS blocks of an SS burst may be sent in non-contiguous radio resources.

[0050] In some aspects, the SS burst may have a burst period, whereby the base station transmits the SS blocks of the SS burst according to the burst period. In other words, the SS blocks may be repeated during each SS burst. In some aspects, the SS burst set may have a burst set periodicity, whereby the base station transmits the SS bursts of the SS burst set according to a fixed burst set period. In other words, the SS burst may be repeated during each SS burst set.

[0051] The base station may send system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain time slots. The base station may send control information / data on a physical downlink control channel (PDCCH) in C symbol periods of a time slot, where B is configurable for each time slot. The base station may send traffic data and / or other data on the PDSCH in the remaining symbol periods of each time slot.

[0052] As indicated above, Figure 3A and Figure 3B Other examples can be found in Figure 3A and Figure 3B The examples described are different.

[0053] Figure 4 An exemplary slot format 410 with a normal cyclic prefix is ​​shown. Available time-frequency resources may be divided into resource blocks. Each resource block may cover a group of subcarriers (e.g., 12 subcarriers) in a slot, and each resource block may include multiple resource elements. Each resource element may cover a subcarrier in a symbol period (e.g., in time), and each resource element may be used to send a modulation symbol, where the modulation symbol may be a real value or a complex value.

[0054] For each of the downlink and uplink for FDD in some telecommunication systems (e.g., NR), an interleaving structure may be used. For example, Q interlaces with indices 0 to Q-1 may be specified, where Q may be equal to 4, 6, 8, 10, or some other value. Each interlace may include time slots separated by Q frames. Specifically, an interlace q may include time slots q, q+Q, q+2Q, etc., where q∈{0,…,Q–1}.

[0055] A UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The BS for service may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, etc. The received signal quality may be quantified by a signal to noise plus interference ratio (SNIR), or a reference signal received quality (RSRQ), or some other metric. The UE may operate in a significant interference scenario, where the UE observes strong interference from one or more interfering BSs.

[0056] Although aspects of the examples described herein are associated with NR or 5G technology, aspects of the present disclosure may also be applicable to other wireless communication systems. New Radio (NR) may refer to a radio configured to operate according to a new air interface (e.g., different from an air interface based on Orthogonal Frequency Division Multiple Access (OFDMA)) or a fixed transport layer (e.g., different from the Internet Protocol (IP)). In some aspects, NR may use OFDM with CP (referred to herein as cyclic prefix OFDM or CP-OFDM) and / or SC-FDM on the uplink, and CP-OFDM on the downlink, including support for half-duplex operation using time division duplex (TDD). In some aspects, NR may, for example, use OFDM with CP (referred to herein as CP-OFDM) and / or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) on the uplink, and CP-OFDM on the downlink, including support for half-duplex operation using TDD. NR may include: enhanced mobile broadband (eMBB) services targeting wide bandwidth (e.g., 80 megahertz (MHz) and above), millimeter wave (mmW) targeting high carrier frequencies (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC technologies, and / or mission critical ultra-reliable low latency communication (URLLC) services.

[0057] In some aspects, a single component carrier bandwidth of 100 MHz may be supported. NR resource blocks may span 12 subcarriers in a duration of 0.1 milliseconds (ms), with a subcarrier bandwidth of 60 or 120 kilohertz (kHz). Each radio frame may include 40 time slots, and the length of each radio frame is 10 ms. Thus, each time slot may have a length of 0.25 ms. Each time slot may indicate a link direction (e.g., DL or UL) for data transmission, and the link direction of each time slot may be switched dynamically. Each time slot may include DL / UL data and DL / UL control data.

[0058] Beamforming may be supported, and the beam direction may be dynamically configured. In addition, MIMO transmission with precoding may be supported. MIMO configuration in DL may support up to 8 transmit antennas, with multi-layer DL transmission of up to 8 streams and up to 2 streams per UE. Multi-layer transmission of up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported with up to 8 serving cells. Alternatively, NR may support different air interfaces that are different from OFDM-based interfaces. NR networks may include entities such as central units or distributed units.

[0059] As indicated above, Figure 4 Other examples can be found in Figure 4 The examples described are different.

[0060] In a wireless network, a BS and a UE can communicate via a downlink channel. In some cases, a BS can aggregate multiple radio frequency carriers for a downlink channel, which can be referred to as carrier aggregation. Carrier aggregation can increase the bandwidth of a downlink channel, which can in turn increase the throughput of a downlink channel, increase the reliability of a downlink channel, reduce the delay of a downlink channel, and so on. Each radio frequency carrier in a downlink channel of carrier aggregation can be referred to as a component carrier (CC). In addition, each CC can be associated with a serving cell of a BS. For example, a primary CC can be associated with a primary cell, and a secondary CC can be associated with a secondary cell. In some cases, a UE can communicate with a primary cell and / or one or more secondary cells belonging to a physical uplink control channel (PUCCH) group. A "PUCCH group" can refer to a group of cells including a PUCCH cell (e.g., a primary cell if one PUCCH group is configured, or a primary cell and a secondary cell if two PUCCH groups are configured), wherein the PUCCH cell can be used for all PUCCH communications of the PUCCH group.

[0061] In some cases, the UE may establish communication with each cell served by the CC through a corresponding beam. To provide beam failure detection, the BS may send a corresponding beam failure detection reference signal (BFD-RS) on each cell. The UE may perform one or more measurements of the BFD-RS and may determine whether the corresponding beam fails based at least in part on the one or more measurements.

[0062] If the UE detects a beam failure associated with a cell, the UE may send a beam failure recovery request (BFRQ) communication (e.g., a BFRQ communication of a BFRQ process) on a PUCCH cell (e.g., a primary cell) using resources allocated to the UE to send BFRQ communications. In some cases, a plurality of resources (e.g., dedicated resources) may be allocated to the UE to send BFRQ communications, each resource being used for a bandwidth part (BWP) associated with a particular PUCCH group. In some aspects, the UE may select one of the plurality of resources to send the BFRQ communication. In some aspects, the UE may use only one of the plurality of resources associated with a particular PUCCH group related to the BFRQ communication. In some cases, a single resource (e.g., a dedicated resource) may be allocated to the UE to send BFRQ communications, and the UE may use the resource for all BFRQ communications of the UE.

[0063] In some aspects, in response to the BFRQ communication, the UE may receive an uplink grant on a PUCCH cell for a physical uplink shared channel (PUSCH) communication of the UE associated with the BFRQ process. The UE may send an uplink communication based on the uplink grant, which may indicate a CC identifier (e.g., index), a cell identifier (e.g., index), etc. associated with the failed beam, and a candidate beam for replacing the failed beam. Since carrier aggregation results in a greater number of CCs being aggregated for the UE, the signaling overhead for reporting a single beam failure for multiple cells may be inefficient and may result in the consumption of a large amount of radio resources, UE resources (e.g., battery power, processing resources, memory resources, communication resources, etc.), and BS resources (e.g., processing resources, memory resources, communication resources, etc.).

[0064] Some techniques and apparatus described herein regulate the transmission of BFRQ communications by a UE (e.g., UE 120). In some aspects, a UE may be allowed to send a BFRQ communication only after a threshold period of time has passed since the UE sent a previous BFRQ communication. Additionally or alternatively, the UE may be allowed to send a BFRQ communication if the number of BFRQ communications sent by the UE does not exceed a threshold value. In this manner, the UE may avoid sending unnecessary or redundant BFRQ communications, thereby reducing signaling overhead and consumption of radio resources, UE resources, and / or BS resources.

[0065] Figure 5 is a diagram illustrating an example 500 associated with indicating beam failure for multiple cells in accordance with various aspects of the present disclosure. Figure 5As shown in , example 500 includes communication between BS 110 and UE 120. In some aspects, BS 110 and UE 120 may be included in a wireless network (e.g., wireless network 100). BS 110 and UE 120 may communicate over a wireless access link, which may include an uplink and a downlink.

[0066] As shown in the reference numeral 505, UE 120 may establish a connection with BS 110 over multiple cells (e.g., multiple CCs). For example, UE 120 may establish a connection with BS 110 over a primary cell (PCell) and one or more secondary cells (SCells). Thus, UE 120 and BS 110 may communicate over the primary cell and the secondary cell. For example, UE 120 and BS 110 may communicate over the primary cell using a first beam (e.g., a first beam direction) and communicate over the secondary cell using a second beam (e.g., a second beam direction). In some aspects, the primary cell and one or more secondary cells may be configured as a PUCCH group, and UE 120 may use the primary cell for PUCCH transmissions of all cells of the PUCCH group. In some aspects, at least one secondary cell may be configured as a PUCCH group, and UE 120 may use the secondary cell for PUCCH transmissions of all cells of the PUCCH group.

[0067] As indicated by reference numeral 510, UE 120 may detect a beam failure associated with the secondary cell. For example, UE 120 may perform a measurement of a BFD-RS transmitted by BS 110 on a cell to detect a beam failure of the cell. If the quality, received power, etc. associated with the BFD-RS do not meet a threshold, UE 120 may determine a beam failure.

[0068] As indicated by reference numeral 515, UE 120 may selectively send a BFRQ communication (which may also be referred to as a scheduling request for beam failure recovery) to BS 110 based at least in part on detecting a beam failure associated with a secondary cell. In some aspects, the UE may detect a beam failure associated with a secondary cell and may send a BFRQ communication for the secondary cell on a PUCCH cell associated with the secondary cell based at least in part on determining that a threshold time period has passed since the UE sent a previous BFRQ communication. In some aspects, the previous BFRQ communication may involve a secondary cell or another secondary cell with which the UE has established communication. For example, the secondary cell and the other secondary cells may be in the same PUCCH group.

[0069] In some aspects, the UE may use a timer (e.g., sr-ProhibitTimer) to determine when a threshold period of time for sending a BFRQ communication has passed. That is, the timer may expire when the threshold period of time has passed. The UE may initiate the timer when the UE sent a previous BFRQ communication. Before the timer expires, the UE may not send the BFRQ communication. In some aspects, the UE may queue the BFRQ communication or delay the generation of the BFRQ communication while waiting for the expiration of the timer.

[0070] In some aspects, for example, when the UE is capable of sending a BFRQ communication in one of a plurality of resources allocated to the UE, after sending a previous BFRQ communication in one of the plurality of resources, the UE may not send a BFRQ communication in the same resource of the plurality of resources, or may not send a BFRQ communication in any of the plurality of resources until a timer expires (e.g., a threshold time period has passed). That is, the timer may be related to a BFRQ communication sent in a particular resource, or the timer may be related to a BFRQ communication sent in any of the plurality of resources. In some aspects, for example, when the UE is capable of sending a BFRQ communication in a particular resource allocated to the UE, after sending a previous BFRQ communication in the resource, the UE may not send a BFRQ communication in the resource until a timer expires (e.g., a threshold time period has passed). For example, if the UE is capable of sending a BFRQ communication for a PUCCH group using a particular resource, the UE may not send more than one BFRQ communication for the PUCCH group within the threshold time period.

[0071] In some aspects, the UE may cancel the timer before the timer expires (e.g., before the threshold time period has passed), thereby enabling the UE to send BFRQ communication within the threshold time period. For example, if the UE receives an uplink grant (e.g., on a PUCCH cell) in response to a previous BFRQ communication, the UE may cancel the timer and send the BFRQ communication before the timer expires. In this case, the previous BFRQ communication and the BFRQ communication may involve the same secondary cell.

[0072] In some aspects, a UE may not send a BFRQ communication based at least in part on determining that the number of BFRQ communications sent by the UE satisfies a threshold. For example, if the number of BFRQ communications sent for a secondary cell (e.g., sr-TransMax) satisfies a threshold, the UE may not send a BFRQ communication associated with a particular secondary cell. In some aspects, the UE may be configured (e.g., via radio resource control signaling) or otherwise provided with the number of BFRQ communications to use.

[0073] In some aspects, the UE may use a counter (e.g., SR_COUNTER) to determine the number of BFRQ communications that have been sent by the UE. Thus, the counter may provide an indication of when the UE stops continuing to send BFRQ communications (e.g., a counter that meets a threshold value may indicate a radio link failure with a PUCCH cell). In some aspects, the counter may be associated with a particular secondary cell. For example, each time a BFRQ communication is sent for a secondary cell, the UE may increment the counter for the secondary cell.

[0074] In some aspects, for example, when a UE is capable of sending a BFRQ communication in one of a plurality of resources allocated to the UE, when a BFRQ communication is sent in any of the plurality of resources, or in a particular resource of the plurality of resources (e.g., associated with a particular secondary cell associated with the counter), the UE may increment a counter. That is, the counter may be associated with a BFRQ communication sent in a particular resource, or the counter may be associated with a BFRQ communication sent in any of the plurality of resources. In some aspects, for example, when a UE is capable of sending a BFRQ communication in a particular resource allocated to the UE, when a BFRQ communication is sent in a particular resource (e.g., associated with a particular secondary cell associated with the counter), the UE may increment a counter.

[0075] In this case, when the counter meets the threshold value, the UE may stop sending BFRQ communications (e.g., related to the secondary cell associated with the counter). Therefore, one or more queued or delayed BFRQ communications (e.g., queued or delayed BFRQ communications waiting for the timer to expire as described above) may be discarded, and the UE may initiate a random access channel (RACH) procedure on a PUCCH cell (e.g., a primary cell, a secondary primary cell, or a secondary cell) for the PUCCH group of the secondary cell associated with the counter.

[0076] In some aspects, after the counter has satisfied a threshold value, the counter may be reset to an initial value (e.g., zero) to enable the UE to resume sending BFRQ communications. For example, if the UE receives an uplink grant (e.g., on a PUCCH cell) as a response to a previous BFRQ communication (e.g., a previous BFRQ communication of a secondary cell associated with the counter), the UE may reset the counter. In some aspects, the UE may discard one or more queued or delayed BFRQ communications based at least in part on receiving an uplink grant. In this case, the UE may send an uplink communication (e.g., based on an uplink grant) (e.g., on a PUCCH cell), for each of the one or more discarded BFRQ communications, the uplink communication indicating a corresponding CC or cell identifier and a corresponding candidate beam for replacing a corresponding failed beam associated with the one or more discarded BFRQ communications.

[0077] In this way, the UE may avoid sending unnecessary or redundant BFRQ communications, thereby reducing signaling overhead and consumption of radio resources, UE resources, and / or base station resources.

[0078] As indicated above, Figure 5 Other examples can be found in Figure 5 The examples described are different.

[0079] Figure 6 6 is a diagram illustrating an exemplary process 600 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Exemplary process 600 is an example of a UE (eg, UE 120, etc.) performing operations associated with indicating beam failure of multiple cells.

[0080] like Figure 6 As shown in , in some aspects, process 600 may include: detecting a beam failure associated with one of the multiple cells (block 610). For example, the UE may detect (e.g., using antenna 252, DEMOD 232, MIMO detector 256, receive processor 258, controller / processor 280, etc.) a beam failure associated with one of the multiple cells, as described above.

[0081] like Figure 6As further shown in FIG. 6 , in some aspects, process 600 may include selectively sending a BFRQ communication for the cell based at least in part on determining whether a threshold time period has elapsed since a previous BFRQ communication was sent for the cell or another cell in the plurality of cells (block 620). For example, the UE may (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) selectively send a BFRQ communication for the cell based at least in part on determining whether a threshold time period has elapsed since a previous BFRQ communication was sent for the cell or another cell in the plurality of cells, as described above.

[0082] Process 600 may include additional aspects, such as any single aspect or any combination of the aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0083] In a first aspect, the plurality of cells belong to a PUCCH group.

[0084] In a second aspect, alone or in combination with the first aspect, the UE will use a resource of a plurality of resources to send the BFRQ communication, the previous BFRQ communication was sent in a first resource of the plurality of resources, and based at least in part on determining that the threshold time period has passed, the BFRQ communication is sent in the first resource or a second resource of the plurality of resources. In a third aspect, alone or in combination with one or more of the first and second aspects, the UE will use a resource to send the BFRQ communication, the previous BFRQ communication was sent in the resource, and based at least in part on determining that the threshold time period has passed, the BFRQ communication is sent in the resource.

[0085] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the BFRQ communication is sent before the threshold time period has passed based at least in part on receiving an uplink grant in response to the previous BFRQ communication.

[0086] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 600 further comprises sending the previous BFRQ communication, and initiating a timer associated with the threshold time period based at least in part on sending the previous BFRQ communication.

[0087] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the UE will use one of the multiple resources to send the BFRQ communication, and will not send the BFRQ communication based at least in part on determining that the number of BFRQ communications sent in one or more of the multiple resources meets a threshold. In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 600 also includes: initiating a random access channel procedure based at least in part on determining that the number of BFRQ communications meets the threshold.

[0088] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the UE will use resources to send the BFRQ communication, and will not send the BFRQ communication based at least in part on determining that the number of BFRQ communications sent in the resources meets a threshold value. In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, process 600 further includes: initiating a random access channel procedure based at least in part on determining that the number of BFRQ communications meets the threshold value.

[0089] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the process 600 further comprises: sending the previous BFRQ communication in resources allocated to the UE for sending BFRQ communications, and incrementing a counter associated with the resources based at least in part on sending the previous BFRQ communication. In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the process 600 further comprises: resetting the counter based at least in part on receiving an uplink grant as a response to the previous BFRQ communication. In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the BFRQ communication is not sent based at least in part on receiving the uplink grant, and the process 600 further comprises: sending an uplink communication based on an uplink grant identifying the cell or at least one of the candidate beams for the cell.

[0090] Although Figure 6 An exemplary block diagram of process 600 is shown, but in some aspects, the same Figure 6 Process 600 may include additional blocks, fewer blocks, different blocks, or blocks in a different arrangement than described in . Additionally or alternatively, two or more of the blocks of process 600 may be performed in parallel.

[0091] The above disclosure provides illustration and description, but is not exhaustive, nor does it limit these aspects to the precise form disclosed. Modifications and variations can be made based on the above disclosure, or modifications and variations can be obtained from the practice of these aspects.

[0092] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented using hardware, firmware, and / or a combination of hardware and software.

[0093] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0094] It is apparent that the systems and / or methods described herein can be implemented using various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and performance of these systems and / or methods are described without reference to specific software codes, and it should be understood that software and hardware used to implement these systems and / or methods can be designed based at least in part on the description herein.

[0095] Although the combination of features is set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically set forth in the claims and / or not disclosed in the specification. Although each of the dependent claims listed below directly depends on only one claim, the disclosure of various aspects includes each dependent claim in combination with each other claim item in the claim group. The phrase referring to "at least one of" a list item refers to any combination of these items (which includes a single member). For example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other ordering of a, b and c).

[0096] Any element, action or instruction used in this application should not be interpreted as being critical or fundamental, unless so clearly described. In addition, as used herein, the articles "a" and "an" are intended to include one or more, which can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more (e.g., related items, irrelevant items, combinations of related items and irrelevant items, etc.), which can be used interchangeably with "one or more". If only one item is intended to be referred to, the phrase "only one" or similar terms will be used. In addition, as used herein, the terms "containing", "having", "comprising", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A method of wireless communication performed by a user equipment UE, comprising: detecting a beam failure associated with a first secondary cell among a plurality of cells, the plurality of cells comprising a primary cell, the first secondary cell, and a second secondary cell, and wherein the plurality of cells belong to a physical uplink control channel group; and A BFRQ communication for the first secondary cell is selectively sent on the primary cell based at least in part on determining whether a threshold time period has elapsed since a previous beam failure recovery request (BFRQ) communication was sent for the second secondary cell.

2. The method according to claim 1, wherein: The UE will use one of the plurality of resources to send the BFRQ communication, and The previous BFRQ communication was sent in a first resource of the plurality of resources, and the BFRQ communication is sent in the first resource or a second resource of the plurality of resources based at least in part on determining that the threshold time period has passed.

3. The method according to claim 1, wherein: The UE will use resources to send the BFRQ communication, and Wherein the previous BFRQ communication was sent in the resource, and the BFRQ communication is sent in the resource based at least in part on determining that the threshold time period has elapsed.

4. The method according to claim 1, wherein: The BFRQ communication is sent before the threshold time period has elapsed based at least in part on receiving an uplink grant in response to the previous BFRQ communication.

5. The method according to claim 1, further comprising: sending said previous BFRQ communication; as well as A timer associated with the threshold time period is initiated based at least in part on sending the previous BFRQ communication.

6. The method according to claim 1, wherein: The UE will use one of the plurality of resources to send the BFRQ communication, and Wherein, the BFRQ communication is not sent based at least in part on determining that a number of BFRQ communications sent in one or more of the plurality of resources meets a threshold.

7. The method according to claim 6, further comprising: A random access channel procedure is initiated based at least in part on determining that the number of BFRQ communications satisfies the threshold.

8. The method according to claim 1, wherein: The UE will use resources to send the BFRQ communication, and Wherein, the BFRQ communication is not sent based at least in part on determining that a number of BFRQ communications sent in the resource meets a threshold.

9. The method according to claim 8, further comprising: A random access channel procedure is initiated based at least in part on determining that the number of BFRQ communications satisfies the threshold.

10. The method according to claim 1, further comprising: sending the previous BFRQ communication in resources allocated to the UE for sending BFRQ communications; as well as A counter associated with the resource is incremented based at least in part on sending the previous BFRQ communication.

11. The method according to claim 10, further comprising: The counter is reset based at least in part on receiving an uplink grant in response to the previous BFRQ communication.

12. The method according to claim 11, wherein: not transmitting the BFRQ communication based at least in part on receiving the uplink grant, and The method further includes sending uplink communication according to the uplink grant identifying the first secondary cell or at least one of the candidate beams for the first secondary cell.

13. A user equipment UE for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: detecting a beam failure associated with a first secondary cell among a plurality of cells, the plurality of cells comprising a primary cell, the first secondary cell, and a second secondary cell, and wherein the plurality of cells belong to a physical uplink control channel group; and A BFRQ communication for the first secondary cell is selectively sent on the primary cell based at least in part on determining whether a threshold time period has elapsed since a previous beam failure recovery request (BFRQ) communication was sent for the second secondary cell.

14. The UE according to claim 13, wherein: The UE will use one of the plurality of resources to send the BFRQ communication, and The previous BFRQ communication was sent in a first resource of the plurality of resources, and the BFRQ communication is sent in the first resource or a second resource of the plurality of resources based at least in part on determining that the threshold time period has passed.

15. The UE according to claim 13, wherein: The UE will use resources to send the BFRQ communication, and Wherein the previous BFRQ communication was sent in the resource, and the BFRQ communication is sent in the resource based at least in part on determining that the threshold time period has elapsed.

16. The UE according to claim 13, wherein: The BFRQ communication is sent before the threshold time period has elapsed based at least in part on receiving an uplink grant in response to the previous BFRQ communication.

17. The UE according to claim 13, wherein: The one or more processors are further configured to: sending said previous BFRQ communication; and A timer associated with the threshold time period is initiated based at least in part on sending the previous BFRQ communication.

18. The UE according to claim 13, wherein: The UE will use one of the plurality of resources to send the BFRQ communication, and Wherein, the BFRQ communication is not sent based at least in part on determining that a number of BFRQ communications sent in one or more of the plurality of resources meets a threshold.

19. The UE according to claim 18, wherein: The one or more processors are further configured to initiate a random access channel procedure based at least in part on determining that the number of BFRQ communications satisfies the threshold.

20. The UE according to claim 13, wherein: The UE will use resources to send the BFRQ communication, and Wherein, the BFRQ communication is not sent based at least in part on determining that a number of BFRQ communications sent in the resource meets a threshold.

21. The UE according to claim 20, wherein: The one or more processors are further configured to initiate a random access channel procedure based at least in part on determining that the number of BFRQ communications satisfies the threshold.

22. The UE according to claim 13, wherein: The one or more processors are further configured to: sending the previous BFRQ communication in resources allocated to the UE for sending BFRQ communications; and A counter associated with the resource is incremented based at least in part on sending the previous BFRQ communication.

23. The UE according to claim 22, wherein: The one or more processors are further configured to reset the counter based at least in part on receiving an uplink grant in response to the previous BFRQ communication.

24. The UE according to claim 23, wherein: not transmitting the BFRQ communication based at least in part on receiving the uplink grant, and The one or more processors are further configured to send uplink communications based on an uplink grant identifying at least one of the first secondary cell or a candidate beam for the first secondary cell.

25. A non-transitory computer readable medium storing a set of instructions for wireless communication, the set of instructions comprising: The one or more instructions, when executed by one or more processors of a user equipment UE, cause the UE to perform the following operations: detecting a beam failure associated with a first secondary cell among a plurality of cells, the plurality of cells comprising a primary cell, the first secondary cell, and a second secondary cell, and wherein the plurality of cells belong to a physical uplink control channel group; and A BFRQ communication for the first secondary cell is selectively sent on the primary cell based at least in part on determining whether a threshold time period has elapsed since a previous beam failure recovery request (BFRQ) communication was sent for the second secondary cell.

26. An apparatus for wireless communication, comprising: means for detecting a beam failure associated with a first secondary cell among a plurality of cells, the plurality of cells comprising a primary cell, the first secondary cell, and a second secondary cell, and wherein the plurality of cells belong to a physical uplink control channel group; and means for selectively sending a beam failure recovery request (BFRQ) communication for the first secondary cell on the primary cell based at least in part on determining whether a threshold time period has elapsed since sending a previous beam failure recovery request (BFRQ) communication for the second secondary cell.

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