Beam Failure Recovery Request Reuse for Secondary Cell

Abstract

Aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect a conflict on an uplink channel between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; and transmit at least one of the BFRQ transmission or the another uplink transmission on the uplink channel based at least in part on a multiplexing rule. 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 / 902,730, filed on September 19, 2019, entitled "BEAM FAILURE RECOVER REQUEST MULTIPLEXING FOR SECONDARY CELLS", and U.S. Non - Provisional Patent Application No. 16 / 948,242, filed on September 9, 2020, entitled "BEAM FAILURE RECOVER REQUEST MULTIPLEXING FOR SECONDARY CELLS", which are hereby incorporated by reference in their entirety.

[0003] Field of Disclosure

[0004] Aspects of the present disclosure generally relate to wireless communication, and more particularly, to techniques and apparatus for beam failure recovery request multiplexing for secondary cells.

[0005] Background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ multiple access technologies that are capable of supporting 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 / Advanced LTE is an enhanced set of the Universal Mobile Telecommunications System (UMTS) mobile standards promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BSs) capable of supporting communication of several user equipments (UEs). A user equipment (UE) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a B - node, gNB, access point (AP), radio head, transmission reception point (TRP), New Radio (NR) BS, 5G B - node, and so on.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipments to communicate at the urban, national, regional, and even global levels. New Radio (NR), which may also be referred to as 5G, is an enhanced set of the LTE mobile standard promulgated by the 3rd Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrums, and using Orthogonal Frequency Division Multiplexing with Cyclic Prefix (CP-OFDM) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also referred to 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 to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvement in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies.

[0009] Summary

[0010] In some aspects, a method for a user equipment (UE) to perform wireless communication may include: detecting a conflict on an uplink channel between a Beam Failure Recovery Request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; and transmitting at least one of the BFRQ transmission or the another uplink transmission on the uplink channel at least partially based on a multiplexing rule.

[0011] 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 conflict on an uplink channel between a BFRQ transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; transmit at least one of the BFRQ transmission or the another uplink transmission on the uplink channel at least partially based on a multiplexing rule.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: detect a conflict on an uplink channel between a BFRQ transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; transmit at least one of the BFRQ transmission or the another uplink transmission on the uplink channel at least partially based on a multiplexing rule.

[0013] In some aspects, a device for wireless communication may include: means for detecting a conflict on an uplink channel between a BFRQ transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; and means for transmitting at least one of the BFRQ transmission or the another uplink transmission on the uplink channel based at least in part on a multiplexing rule.

[0014] Aspects 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 substantially described herein with reference to the figures, the specification, and the appendix and as illustrated in the figures and the specification.

[0015] The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, in terms of both their organization and method of operation, as well as the associated advantages, will be better understood when considered in conjunction with the following description taken in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description and is not intended to define a limitation of the claims. Brief Description of the Drawings

[0017] To enable a more particular understanding of the features of the present disclosure as set forth above, reference may be made to the aspects in which some of the aspects are illustrated in the figures. It should be noted, however, that the figures illustrate only certain typical aspects of the present disclosure and should not be considered limiting of its scope, as the description may admit of other equally effective aspects. Like reference numerals in different figures may identify the same or similar elements.

[0018] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network in accordance with various aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example of wireless communication via one or more beams in accordance with various aspects of the present disclosure.

[0021] Figure 4 is a diagram illustrating an example of a beam failure recovery procedure in accordance with various aspects of the present disclosure.

[0022] Figure 5 FIG. is an illustration of an example for beam failure recovery request multiplexing for a secondary cell according to various aspects of the present disclosure.

[0023] Figure 6 FIG. is an illustration of an example process, such as performed by a user equipment, according to various aspects of the present disclosure.

[0024] Detailed Description

[0025] Aspects of the present disclosure are described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based at least in part on the teachings herein, those skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the present disclosure. For example, any number of the aspects set forth herein may be used to implement a device or practice a method. Additionally, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functionality, or a combination of structures and functionality that supplement or are additional to the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of a claim.

[0026] Certain aspects of a telecommunications system will now be presented with reference to various devices and techniques. These devices and techniques will be described in detail hereinafter and illustrated in the drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0027] It should be noted that although aspects in this document may be described using terms typically associated with 3G and / or 4G wireless technologies, aspects of the present disclosure may be applied in other generation-based communication systems (such as 5G and later generations, including NR technologies).

[0028] Figure 1FIG. 0 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmission reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0029] 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., with a radius of several kilometers) and may allow unconstrained access by UEs having a service subscription. A pico cell may cover a relatively small geographic area and may allow unconstrained access by UEs having a service subscription. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow constrained access by 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 the Figure 1 example shown in FIG. 5, 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 herein.

[0030] In some aspects, a cell may not have to be stationary, and the geographic area of a cell may move according to the location of a mobile BS. In some aspects, BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or analogs using any suitable transport network.

[0031] The wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. In Figure 1 the example shown in, the relay station 110d can communicate with the macro BS 110a and the UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station can also be referred to as a relay BS, a relay base station, a relay, etc.

[0032] The wireless network 100 can be a heterogeneous network that includes 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 impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0033] The network controller 130 can be coupled to the set of BSs and can provide coordination and control of these BSs. The network controller 130 can communicate with each BS via a backhaul. These BSs can also communicate with each other directly or indirectly, e.g., via a wireless or wired backhaul.

[0034] UEs 120 (e.g., 120a, 120b, 120c, 120d, 120e) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. A 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, a camera, a gaming device, a netbook, a smartbook, a superbook, a medical device or equipment, a biometric sensor / 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), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0035] Some UEs may be considered machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to a network (e.g., a wide area network such as the Internet or a cellular network) or provide connectivity to the network via a wired or wireless communication link, for example. Some UEs may be considered Internet of Things (IoT) devices, and / or may be implemented as narrowband IoT (NB-IoT) devices. Some UEs may be considered customer premise equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0036] Generally, any number of wireless networks may be deployed in a given geographical area. Each wireless network may support a specific RAT and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT in a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR or 5G RAT network may be deployed.

[0037] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., communicate with each other without using base station 110 as an intermediary). 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.), a mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0038] As indicated above, Figure 1 is provided as an example. Other examples may be different from the example regarding Figure 1 described.

[0039] Figure 2 FIG. 200 shows a block diagram of the design of base station 110 and UE 120, where base station 110 and UE 120 may be Figure 1One of the base stations and one of the UEs in []. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, where generally T≥1 and R≥1.

[0040] 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 (MCSs) for the UE at least in part based on the channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for the UE at least in part based 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 (CRSs)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, overhead symbols, and / or reference symbols when applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from the modulators 232a to 232t may be transmitted via the T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0041] At the UE 120, antennas 252a through 252r may receive downlink signals from the base station 110 and / or other base stations and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain the received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols when applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide the decoded data for the UE 120 to the data sink 260, and provide the decoded control information and system information to the controller / processor 280. The channel processor may determine the 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 the UE 120 may be included in a housing.

[0042] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). 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 the TX MIMO processor 266 when applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, the 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 when applicable, and further processed by the receive processor 238 to obtain the 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 provide 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.

[0043] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component may perform one or more techniques associated with multiplexing beam failure recovery requests (BFRQs) for a secondary cell, as described in more 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 operations of, for example, Figure 6 Process 600 and / or other processes as described herein. The memories 242 and 282 may store data and program code for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120, the one or more instructions may perform or direct operations of, for example, Figure 6 Process 600 and / or other processes as described herein. The scheduler 246 may schedule the UE for data transmission on the downlink and / or uplink.

[0044] In some aspects, the UE 120 may include: means for detecting a conflict on an uplink channel between a BFRQ transmission for triggering beam failure recovery of a secondary cell and another uplink transmission; means for transmitting at least one of the BFRQ transmission or the other uplink transmission on the uplink channel based at least in part on multiplexing rules; and so on. In some aspects, such means may include one or more components of the UE 120 described in conjunction with Figure 2 Such as the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, the DEMOD 254, the MIMO detector 256, the receive processor 258, and so on.

[0045] As indicated above, Figure 2 is provided as an example. Other examples may be different from the examples described with respect to Figure 2 the examples described.

[0046] Figure 3 is a diagram illustrating an example 300 of wireless communication via one or more beams in accordance with certain aspects of the present disclosure.

[0047] As Figure 3As shown, a first device 305 (e.g., shown as a UE (such as UE 120) in example 300) may communicate with a second device 310 (e.g., shown as a BS (such as BS 110) in example 300) using one or more active beams 315. In some aspects, the first device 305 and the second device 310 may also be able to communicate via one or more candidate beams 320. In some aspects, an active beam 315 may be selected from a set of candidate beams 320 by comparing beam parameters (e.g., RSRP, RSRQ, RSSI, etc.) of the set of candidate beams 320. For example, the active beam 315 may be the beam having the best beam parameters among all the beams in the set of candidate beams 320. In some aspects, these beams may operate in a millimeter wave radio frequency band.

[0048] In some aspects, if the active beam 315 experiences a failure, the first device 305 may perform a beam failure recovery procedure. For example, upon detecting a failure of the active beam 315, the first device 305 may attempt to communicate with the second device 310 by transmitting a BFRQ transmission via one or more candidate beams 320.

[0049] The first device 305 may detect a failure at least in part based on monitoring one or more beam failure detection reference signals. For example, when the first device 305 determines that the measured RSRP of a beam failure detection reference signal meets a threshold, the first device 305 may determine that a beam failure has occurred.

[0050] As indicated above, Figure 3 is provided as an example. Other examples may be different from the example regarding Figure 3 described.

[0051] Figure 4 is a diagram illustrating an example 400 of a beam failure recovery procedure in accordance with certain aspects of the present disclosure.

[0052] As Figure 4 shown, the BS 110 and the UE 120 may communicate with each other using carrier aggregation. By using carrier aggregation, the BS 110 and the UE 120 may communicate with each other using a primary cell (PCell) and one or more secondary cells (SCells). In example 400, the secondary cells are DL-only secondary cells, which means these secondary cells are configured for downlink communication only and are not configured for uplink communication. However, in some aspects, the secondary cells may be configured for DL and UL operations, UL-only operations, DL-only operations, combinations thereof, etc.

[0053] As indicated by reference numeral 405, the UE 120 may detect a beam failure on a DL secondary cell only. For example, the UE 120 may detect the beam failure by monitoring beam failure detection reference signals on the DL secondary cell only. As indicated by reference numeral 410, the UE 120 and the BS 110 may use the primary cell to perform a beam failure recovery (BFR) procedure, which may also be referred to as a link recovery procedure. For example, the UE 120 may transmit a BFRQ scheduling request (SR) (BFRQ-SR) on the primary cell via a physical uplink control channel (PUCCH). The scheduling request may trigger beam failure recovery (BFR). At least in part based on receiving the scheduling request, the BS 110 may transmit a physical downlink shared channel (PDCCH) communication on the primary cell, and the PDCCH communication schedules PUCCH communication for BFR.

[0054] The UE 120 may receive the PDCCH communication and may transmit the scheduled PUCCH communication on the primary cell. The PUCCH communication may identify the secondary cell that has experienced the beam failure and / or may indicate a candidate beam index for a candidate beam to replace the failed beam. For example, the PUCCH communication may include a media access control (MAC) control element (CE) (MAC-CE) (which may be referred to as a BFRQ MAC-CE) that identifies the failed secondary cell and the replacement beam. At least in part based on receiving the PUCCH communication, the BS 110 may transmit a PDCCH communication on the primary cell, and the PDCCH communication instructs the UE 120 regarding the BFR procedure. For example, the PDCCH communication may instruct the UE 120 to perform a random access procedure for the secondary cell on one or more candidate beams. The UE 120 may perform BFR according to the PDCCH communication to obtain a new beam for communication on the secondary cell.

[0055] As indicated above, Figure 4 is provided as an example. Other examples may be different from the example regarding Figure 4 described.

[0056] As described above, the UE may detect a beam failure of a beam and may transmit one or more BFRQ transmissions (which may also be referred to as link recovery request (LRR) transmissions) to perform a beam failure recovery procedure (link recovery procedure). For example, the UE may transmit a BFRQ-SR via the primary cell to initiate a beam failure recovery procedure, and may subsequently transmit a BFRQ MAC-CE via the primary cell to enable completion of the beam failure recovery procedure. In this case, the UE uses dedicated resources on the primary cell to transmit the one or more BFRQ transmissions.

[0057] However, when the secondary cell provides uplink resources for the UE transmission, the UE may not need to wait for dedicated resources on the primary cell to transmit the BFRQ transmission. For example, the UE may identify uplink resources on the secondary cell and may use the uplink resources on the secondary cell to transmit the BFRQ transmission. In this way, the UE can reduce the latency associated with waiting for dedicated resources on the primary cell. However, the same uplink resources identified for the UE on the secondary cell to transmit the BFRQ transmission may be scheduled for another uplink transmission. For example, the UE may be scheduled to transmit an uplink control information (UCI) transmission, an uplink data transmission, etc. at a specific time resource that the UE identifies for transmitting the BFRQ transmission. This may result in a conflict between the BFRQ transmission and another uplink transmission, which may cause the other uplink transmission to be adversely discarded.

[0058] Some aspects described herein enable selective multiplexing of the BFRQ transmission with another uplink transmission on the uplink channel of the secondary cell. For example, the UE may detect a conflict between the BFRQ transmission and the other uplink transmission, and may selectively multiplex the BFRQ transmission onto the uplink channel at least in part based on a multiplexing rule. In this case, the UE may transmit at least one of the uplink transmission or the BFRQ transmission on the uplink channel at least in part based on the multiplexing rule. In this way, the UE can implement the BFRQ transmission on the secondary cell without causing other uplink transmissions to be adversely discarded.

[0059] Figure 5 is a diagram illustrating example 500 for BFRQ multiplexing for a secondary cell according to various aspects of the present disclosure. As Figure 5 shown, example 500 includes BS 110 and UE 120.

[0060] As Figure 5 shown and indicated by reference numeral 510 in the figure, the UE 120 may detect a beam failure on the secondary cell. For example, the UE 120 may determine that the measurement of the beam failure detection reference signal meets a measurement threshold, as described above. In some aspects, the UE 120 may determine to initiate a beam failure recovery procedure. For example, the UE 120 may determine to transmit a BFRQ-SR to initiate the beam failure recovery procedure.

[0061] As Figure 5As shown by reference numeral 520 in the figure, UE 120 may detect a conflict on the uplink channel between a BFRQ transmission and another uplink transmission. For example, UE 120 may determine that the resources on the uplink channel on which UE 120 may transmit a BFRQ transmission are allocated for transmitting another uplink transmission. In some aspects, UE 120 may detect a conflict for a specific type of BFRQ transmission. For example, UE 120 may detect a conflict for a transmission of BFRQ-SR, a subsequent BFRQ MAC-CE, etc. Similarly, UE 120 may detect a conflict with a specific type of uplink transmission. For example, UE 120 may detect a conflict with uplink control information (UCI) on a PUCCH type of uplink channel, a conflict with an uplink data transmission on a physical uplink shared channel (PUSCH) type of uplink channel, etc.

[0062] In some aspects, UE 120 may evaluate multiplexing rules to determine whether to multiplex a BFRQ transmission onto the uplink channel. For example, UE 120 may determine to multiplex a BFRQ transmission onto a specific type of channel corresponding to the specific type of the BFRQ transmission. In this case, UE 120 may determine to multiplex BFRQ-SR onto the PUCCH, multiplex a BFRQ MAC-CE with uplink data onto the PUSCH that is to convey the uplink data transmission, etc. Further with respect to this example, when the PUCCH includes hybrid automatic repeat request (HARQ) acknowledgement (ACK) information bits associated with PUCCH format 2, format 3, or format 4, UE 120 may multiplex a BFRQ transmission onto the uplink channel.

[0063] In some aspects, UE 120 may determine to multiplex a BFRQ transmission onto the uplink channel at least in part based on a match between the type identifying the BFRQ transmission and the type of the other uplink transmission. For example, UE 120 may determine that the BFRQ transmission is BFRQ-SR and the UCI transmission is another SR transmission. In this case, UE 120 may determine to multiplex the BFRQ-SR and the other SR. Additionally or alternatively, UE 120 may determine the priority of the other uplink transmission (e.g., at least in part based on the type of the other uplink transmission) and the BFRQ transmission, and may determine whether to multiplex the BFRQ transmission at least in part based on the priority. For example, when the BFRQ transmission is associated with a higher priority than the other transmission, UE 120 may determine to multiplex the BFRQ transmission with the other transmission. In this case, UE 120 may determine the priority of the BFRQ transmission at least in part based on the type of the BFRQ transmission. For example, UE 120 may determine a first priority for BFRQ-SR and a different second priority for BFRQ MAC-CE.

[0064] In some aspects, the UE 120 may determine whether to multiplex a BFRQ transmission based at least in part on characteristics of a first secondary cell on which a beam failure is detected and / or a second secondary cell on which an uplink channel is communicated. For example, when the BFRQ transmission is for a beam failure recovery procedure of a first secondary cell with a relatively high priority and the second secondary cell on which the uplink channel is to be communicated is associated with a relatively low priority, the UE 120 may determine to multiplex the BFRQ transmission onto the uplink channel. Additionally or alternatively, when the first secondary cell and the second secondary cell are included in the same secondary cell group, the UE 120 may determine to multiplex the BFRQ transmission onto the uplink channel. Additionally or alternatively, when the BFRQ transmission is scheduled for a subsequent transmission on a third secondary cell, the UE 120 may determine not to multiplex the BFRQ transmission onto the uplink channel. In contrast, when the BFRQ transmission is scheduled for a subsequent transmission on the second secondary cell, the UE 120 may multiplex the BFRQ transmission onto the uplink channel (of the second secondary cell) to achieve reduced transmission latency.

[0065] In some aspects, the UE 120 may determine whether to multiplex a BFRQ transmission onto an uplink channel based at least in part on channel characteristics of the secondary cell. For example, when the UE 120 determines that the secondary cell is associated with a channel quality less than a threshold (e.g., when the UE 120 detects a beam failure of the secondary cell), the UE 120 may determine not to multiplex the BFRQ onto the uplink channel of the secondary cell. Additionally or alternatively, the UE 120 may determine that the secondary cell is associated with a channel quality greater than or equal to the threshold and may determine to multiplex the BFRQ onto the uplink channel of the secondary cell.

[0066] In some aspects, the UE 120 may determine whether to multiplex a BFRQ transmission onto an uplink channel based at least in part on a beam mapping. For example, when multiplexing a BFRQ scheduling request onto the uplink channel will result in a beam failure of the corresponding BFRQ MAC-CE, the UE 120 may refrain from multiplexing the BFRQ-SR onto the uplink channel. In some aspects, the UE 120 may determine whether to multiplex a BFRQ transmission onto an uplink channel based at least in part on timing criteria. For example, the UE 120 may select a first available resource (e.g., in resources of the primary cell and / or one or more secondary cells) on which to multiplex the BFRQ transmission with another uplink transmission, thereby reducing the latency associated with transmitting the BFRQ transmission to the BS 110.

[0067] As Figure 5As shown by reference numeral 530, the UE 120 may transmit at least one of the BFRQ transmission or the other uplink transmission on the uplink transmission channel. For example, at least in part based on determining to multiplex the BFRQ transmission onto the uplink channel, the UE 120 may transmit both the BFRQ transmission and the other uplink transmission on the uplink channel. Additionally or alternatively, the UE 120 may transmit the BFRQ transmission on the uplink channel and discard the other uplink transmission. In contrast, at least in part based on determining not to multiplex the BFRQ transmission onto the uplink channel, the UE 120 may transmit the other uplink transmission on the uplink channel and delay the BFRQ transmission until dedicated resources (e.g., on a secondary cell, a primary cell, etc.). In this way, the UE 120 may implement a beam failure recovery procedure on the secondary cell. For example, as shown by reference numeral 540, the BS 110 may transmit a beam failure recovery response (BFRR) in response to the BFRQ-SR to initiate beam recovery, as described above.

[0068] As indicated above, Figure 5 is provided by way of example. Other examples may differ from those Figure 5 described.

[0069] Figure 6 is a diagram illustrating an example process 600 performed, for example, by a UE in accordance with various aspects of the present disclosure. The example process 600 is an example in which a UE (e.g., the first device 305, the UE 120, etc.) performs operations associated with multiplexing a beam failure recovery request for a secondary cell.

[0070] As Figure 6 shown, in some aspects, process 600 may include: detecting a conflict on an uplink channel between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission (block 610). For example, the UE (e.g., using the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, etc.) may detect a conflict on the uplink channel between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission, as described above.

[0071] As Figure 6As further shown, in some aspects, process 600 may include: transmitting at least one of the BFRQ transmission or the other uplink transmission on the uplink channel at least in part based on a multiplexing rule (block 620). For example, a UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit at least one of the BFRQ transmission or the other uplink transmission on the uplink channel at least in part based on a multiplexing rule, as described above.

[0072] Process 600 may include additional aspects, such as any individual aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0073] In a first aspect, the other uplink transmission is uplink control information or an uplink data transmission.

[0074] In a second aspect, alone or in combination with the first aspect, the uplink channel is a physical uplink control channel or a physical uplink shared channel.

[0075] In a third aspect, alone or in combination with one or more of the first and second aspects, the BFRQ transmission is a BFRQ scheduling request or a BFRQ media access control (MAC) control element (CE).

[0076] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 600 includes: determining whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on at least one of: the type of the other uplink transmission, the type of the BFRQ transmission, a latency criterion, a data priority criterion, a cell priority criterion, the characteristics of a secondary cell, or the characteristics of a secondary cell group including the secondary cell.

[0077] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, process 600 includes: determining whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on the characteristics of an uplink beam associated with the uplink channel.

[0078] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the characteristics of the uplink beam are at least in part based on channel measurements.

[0079] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, determining whether to multiplex a BFRQ transmission with the other uplink transmission includes: determining to multiplex the BFRQ transmission with the other uplink transmission based at least in part on a channel measurement meeting a channel measurement threshold.

[0080] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 600 includes: determining whether to multiplex a BFRQ transmission with the other uplink transmission based at least in part on a mapping of a scheduling request to a scheduled beam or a scheduled cell.

[0081] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, determining whether to multiplex a BFRQ transmission with the other uplink transmission includes: determining not to multiplex the BFRQ transmission with the other uplink transmission based at least in part on the mapping being to a failed beam.

[0082] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, process 600 includes: determining whether to multiplex a BFRQ transmission with the other uplink transmission based at least in part on the timing of the uplink channel relative to one or more other available resources.

[0083] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, determining whether to multiplex a BFRQ transmission with the other uplink transmission includes: determining to multiplex the BFRQ transmission with the other uplink transmission based at least in part on the other uplink transmission being associated with the earliest available resources.

[0084] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 600 includes: determining whether to multiplex the BFRQ transmission with the other uplink transmission based at least in part on the type of uplink control information (UCI) with which the BFRQ is to be multiplexed.

[0085] Although Figure 6 example blocks of process 600 are shown, in some aspects, process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks compared to those depicted in Figure 6 Additionally or alternatively, two or more blocks of process 600 may be executed in parallel.

[0086] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be obtained by practicing the aspects.

[0087] As used herein, the term "component" is intended to be broadly construed as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0088] As used herein, depending on the context, meeting a threshold can mean that a value is greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0089] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual special control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—understanding that software and hardware can be designed to implement these systems and / or methods at least in part based on the description herein.

[0090] Although specific feature combinations are recited in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the aspects. In fact, many of these features can be combined in ways not specifically recited in the claims and / or not disclosed in the specification. Although each of the dependent claims listed below may directly depend on only one claim, the disclosure of the aspects includes each dependent claim combined with each other claim in this set of claims. The phrase reciting "at least one of" a list of items refers to any combination of these items, including a single member. As an example, "at least one of a, b, or c" is intended to cover: a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination with multiple identical elements (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c, or any other ordering of a, b, and c).

[0091] The elements, acts, or instructions used herein should not be construed as critical or essential unless expressly described as such. Also, as used herein, the articles "a" and "an" are intended to include one or more items and may be used interchangeably with "one or more." Further, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." Where only one item is intended, the phrase "only one" or similar language is used. Also, as used herein, the terms "having," "including," "containing," etc. are intended to be open-ended terms. Further, the phrase "based on" is intended to mean "at least partially based on" unless otherwise expressly stated.

Claims

1. A method for a user equipment (UE) to perform wireless communication, comprising: detecting a conflict on an uplink channel of another secondary cell in a secondary cell group including the secondary cell between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of the secondary cell and another uplink transmission; determining whether to multiplex the BFRQ transmission with the another uplink transmission at least partially based on characteristics of an uplink beam associated with the uplink channel; and transmitting at least one of the BFRQ transmission or the another uplink transmission on the uplink channel at least partially based on a multiplexing rule.

2. The method according to claim 1, wherein the another uplink transmission is an uplink control information or an uplink data transmission.

3. The method according to claim 1, wherein the uplink channel is a physical uplink control channel or a physical uplink shared channel.

4. The method according to claim 1, wherein the BFRQ transmission is a BFRQ scheduling request or a BFRQ media access control (MAC) control element (CE).

5. The method according to claim 1, further comprising: determining whether to multiplex the BFRQ transmission with the another uplink transmission at least partially based on a type of uplink control information (UCI) with which the BFRQ transmission is to be multiplexed.

6. The method according to claim 1, further comprising: determining whether to multiplex the BFRQ transmission with the another uplink transmission at least partially based on at least one of the following: a type of the another uplink transmission, a type of the BFRQ transmission, a latency criterion, a data priority criterion, a cell priority criterion, characteristics of the secondary cell, or characteristics of the secondary cell group including the secondary cell.

7. The method according to claim 1, wherein the characteristics of the uplink beam are at least partially based on channel measurements.

8. The method according to claim 7, wherein determining whether to multiplex the BFRQ transmission with the another uplink transmission includes: determining to multiplex the BFRQ transmission with the another uplink transmission at least partially based on the channel measurements meeting a channel measurement threshold.

9. The method according to claim 1, further comprising: determining whether to multiplex the BFRQ transmission with the another uplink transmission at least partially based on a mapping of a scheduling request to a scheduled beam or a scheduled cell.

10. The method according to claim 9, wherein determining whether to multiplex the BFRQ transmission with the another uplink transmission includes: determining not to multiplex the BFRQ transmission with the another uplink transmission at least partially based on the mapping being mapped to a failed beam.

11. The method according to claim 1, further comprising: Determine whether to multiplex the BFRQ transmission with the other uplink transmission at least partially based on the timing of the uplink channel relative to one or more other available resources.

12. The method according to claim 11, wherein, determining whether to multiplex the BFRQ transmission with the other uplink transmission includes: determining to multiplex the BFRQ transmission with the other uplink transmission at least partially based on the other uplink transmission being associated with the earliest available resources.

13. A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors coupled to the memory and configured to: detect a conflict on an uplink channel of another secondary cell in a secondary cell group including the secondary cell between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of the secondary cell and another uplink transmission; determine whether to multiplex the BFRQ transmission with the other uplink transmission at least partially based on characteristics of an uplink beam associated with the uplink channel; and transmit at least one of the BFRQ transmission or the other uplink transmission on the uplink channel at least partially based on a multiplexing rule.

14. The UE according to claim 13, wherein, the other uplink transmission is an uplink control information or an uplink data transmission.

15. The UE according to claim 13, wherein, the uplink channel is a physical uplink control channel or a physical uplink shared channel.

16. The UE according to claim 13, wherein, the BFRQ transmission is a BFRQ scheduling request or a BFRQ media access control (MAC) control element (CE).

17. The UE according to claim 13, wherein, the one or more processors are further configured to: determine whether to multiplex the BFRQ transmission with the other uplink transmission at least partially based on the type of uplink control information (UCI) with which the BFRQ transmission is to be multiplexed.

18. The UE according to claim 13, wherein, the one or more processors are further configured to: determine whether to multiplex the BFRQ transmission with the other uplink transmission at least partially based on at least one of the following: the type of the other uplink transmission, the type of the BFRQ transmission, a latency criterion, a data priority criterion, a cell priority criterion, the characteristics of the secondary cell, or the characteristics of the secondary cell group including the secondary cell.

19. The UE according to claim 13, wherein, the characteristics of the uplink beam are at least partially based on channel measurements.

20. The UE according to claim 19, wherein, the one or more processors are configured to when determining whether to multiplex the BFRQ transmission with the other uplink transmission: Determine whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on the channel measurement satisfying a channel measurement threshold.

21. The UE according to claim 13, wherein, the one or more processors are further configured to: Determine whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on a mapping of a scheduling request to a scheduled beam or a scheduled cell.

22. The UE according to claim 21, wherein, when determining whether to multiplex the BFRQ transmission with the other uplink transmission, the one or more processors are configured to: Determine not to multiplex the BFRQ transmission with the other uplink transmission at least in part based on the mapping being mapped to a failed beam.

23. The UE according to claim 13, wherein, the one or more processors are further configured to: Determine whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on the timing of the uplink channel relative to one or more other available resources.

24. The UE according to claim 23, wherein, when determining whether to multiplex the BFRQ transmission with the other uplink transmission, the one or more processors are configured to: Determine to multiplex the BFRQ transmission with the other uplink transmission at least in part based on the other uplink transmission being associated with the earliest available resource.

25. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprises: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to perform the following operations: Detect a conflict between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission on an uplink channel of another secondary cell in a secondary cell group including the secondary cell; Determine whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on characteristics of an uplink beam associated with the uplink channel; and Transmit at least one of the BFRQ transmission or the other uplink transmission on the uplink channel at least in part based on a multiplexing rule.

26. The non-transitory computer-readable medium according to claim 25, wherein, the other uplink transmission is an uplink control information or an uplink data transmission.

27. A device for wireless communication, comprises: Means for detecting a conflict between a beam failure recovery request (BFRQ) transmission for triggering beam failure recovery of a secondary cell and another uplink transmission on an uplink channel of another secondary cell in a secondary cell group including the secondary cell; Means for determining whether to multiplex the BFRQ transmission with the other uplink transmission at least in part based on characteristics of an uplink beam associated with the uplink channel; and Apparatus for transmitting at least one of the BFRQ transmission or the other uplink transmission on the uplink channel based at least in part on a multiplexing rule.

28. The apparatus according to claim 27, wherein, the other uplink transmission is uplink control information or an uplink data transmission.

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