Wireless communication method executed by UE, UE for wireless communication and base station

Abstract

The invention discloses a wireless communication method executed by UE, UE for wireless communication and a base station. The method includes configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more serving cells, where the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells, wherein configuring the MAC-CE further comprises configuring a first one or more set of bits indicating whether a beam failure has occurred on an associated serving cell of the one or more serving cells, a second one or more set of bits indicating whether a beam failure has occurred on an associated serving cell of the one or more serving cells, and a third one or more set of bits indicating whether a beam failure has occurred on an associated serving cell of the one or more serving cells, the second one or more bit sets indicate whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicate whether the single new beam or multiple new beams are associated with the first TRP or the second TRP; and transmitting the MAC-CE to the base station via the at least one serving cell.

Description

[0001] This application is a divisional application of the invention patent application with application date of October 30, 2020, application number 202080106609.0, and invention name “Beam failure recovery medium access control signaling for multiple transmit-receive point systems”. Technical Field

[0002] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for beam failure recovery (BFR) medium access control (MAC) signaling for multiple transmit-receive point (TRP) systems. Background Art

[0003] Wireless communication systems are 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 collection of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0004] A wireless network may include multiple base stations (BSs) that can support communications for multiple user equipment (UEs). User equipment (UEs) may communicate with a base station (BS) via a downlink and an uplink. A downlink (or forward link) refers to a communication link from a BS to a UE, while an uplink (or reverse link) refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, and the like.

[0005] The above-mentioned multiple access technologies have been used in various telecommunication standards to provide a common protocol that enables different user devices to communicate at a city, country, region, or even global level. New Radio (NR) (also referred to as 5G) is a collection of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a 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. Further improvements to LTE, NR, and other radio access technologies are still useful as the demand for mobile broadband access continues to increase. Summary of the invention

[0006] In certain aspects, a method of wireless communication performed by a user equipment (UE) includes: configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more service cells, wherein configuring the MAC-CE also includes: configuring a first one or more bit sets, a second one or more bit sets, and a third one or more bit sets, the first one or more bit sets indicating whether beam failure has occurred on an associated service cell among the one or more service cells, the second one or more bit sets indicating whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicating whether the single new beam or the multiple new beams are associated with the first TRP or the second TRP; and sending the MAC-CE to a base station via at least one service cell.

[0007] In certain aspects, a user equipment (UE) for wireless communication comprises: a memory; one or more processors, the one or more processors coupled to the memory; and instructions, the instructions being stored in the memory and being operable when executed by the one or more processors to cause the UE to: configure a medium access control element (MAC-CE) to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more service cells, wherein the one or more processors are configured when configuring the MAC-CE to: configure a first one or more bit sets, a second one or more bit sets, and a third one or more bit sets, wherein the first one or more bit sets indicate whether a beam failure has occurred on an associated service cell in the one or more service cells, the second one or more bit sets indicate whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicate whether the single new beam or the multiple new beams are associated with the first TRP or the second TRP; and send the MAC-CE to a base station via at least one service cell.

[0008] In certain aspects, a base station for wireless communication comprises: a memory; one or more processors, the one or more processors coupled to the memory; and instructions, the instructions being stored in the memory and being operable when executed by the one or more processors to cause the base station to: receive a medium access control element (MAC-CE) indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more service cells, wherein the MAC-CE comprises a first one or more bit sets, a second one or more bit sets, and a third one or more bit sets, wherein the first one or more bit sets indicate whether a beam failure has occurred on an associated service cell in the one or more service cells, the second one or more bit sets indicate whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicate whether the single new beam or the multiple new beams are associated with the first TRP or the second TRP; and perform a beam failure recovery operation based at least in part on the beam failure information.

[0009] In certain aspects, a method of wireless communication performed by a user equipment (UE) includes: configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and sending the MAC-CE to a base station via at least one service cell.

[0010] In certain aspects, a method of wireless communication performed by a base station includes: receiving a MAC-CE indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and performing a beam failure recovery operation based at least in part on the beam failure information.

[0011] In certain aspects, an apparatus for wireless communication includes: a component for configuring a MAC-CE to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and a component for sending the MAC-CE to a base station via at least one service cell.

[0012] In certain aspects, an apparatus for wireless communication includes: a component for receiving a MAC-CE indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and a component for performing a beam failure recovery operation based at least in part on the beam failure information.

[0013] In certain aspects, a user equipment (UE) for wireless communication includes: a memory; one or more processors coupled to the memory; and instructions, which are stored in the memory and are operable when executed by the one or more processors to cause the UE to: configure a MAC-CE to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and send the MAC-CE to a base station via at least one service cell.

[0014] In certain aspects, a base station for wireless communication includes: a memory; one or more processors coupled to the memory; and instructions, which are stored in the memory and are operable when executed by the one or more processors to cause the base station to: receive a MAC-CE indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and perform a beam failure recovery operation based at least in part on the beam failure information.

[0015] In certain aspects, a non-transitory computer-readable medium stores one or more instructions for wireless communication, which, when executed by one or more processors of a user equipment (UE), causes the UE to: configure a MAC-CE to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and send a MAC-CE to a base station via at least one service cell.

[0016] In certain aspects, a non-transitory computer-readable medium stores one or more instructions for wireless communication, which, when executed by one or more processors of a base station, causes the base station to: receive a MAC-CE indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells; and perform a beam failure recovery operation based at least in part on the beam failure information.

[0017] As fully described herein with reference to and as illustrated in the accompanying drawings, aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems.

[0018] The foregoing has been fairly extensively summarized according to the features and technical advantages of the examples of the present disclosure, so that the following detailed description can be better understood. 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 achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the attached drawings, the characteristics of the concepts disclosed herein, their organization and methods of operation together with the associated advantages will be better understood according to the following description. Each of the accompanying drawings is provided for the purpose of illustration and description, rather than as a definition of the limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description briefly summarized above may be made with reference to various aspects, some of which are shown in the attached drawings. However, it should be noted that the attached drawings only show certain typical aspects of the present disclosure and therefore should not be considered to limit the scope of the present disclosure, as the specification may allow other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0020] Figure 1 is a diagram illustrating an example of a wireless network in accordance with various aspects of the present disclosure.

[0021] Figure 2 is a diagram illustrating an example of a base station communicating with a UE in a wireless network according to various aspects of the present disclosure.

[0022] Figure 3 The figure illustrates an example logical architecture of a distributed RAN according to aspects of the present disclosure.

[0023] Figure 4 is a diagram illustrating an example of multi-TRP communications (sometimes referred to as multi-panel communications) in accordance with various aspects of the present disclosure.

[0024] Figure 5 is a diagram illustrating an example of TRP differentiation at a UE based at least in part on a CORESET pool index in accordance with various aspects of the present disclosure.

[0025] Figure 6 is a diagram illustrating an example of signaling associated with beam failure recovery for multi-TRP deployment using multi-TRP BFR MAC-CE in accordance with various aspects of the present disclosure.

[0026] Figure 7-Figure 11 is a diagram illustrating an example of a multi-TRP BFRMAC-CE indicating beam failure information according to various aspects of the present disclosure.

[0027] Fig.12 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0028] Fig.13 is a diagram illustrating example processes performed, for example, by a base station according to various aspects of the present disclosure.

[0029] Figure 14-15 is a block diagram of an example apparatus for wireless communications in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0030] Beam Failure Recovery (BFR) and Beam Failure Recovery Request (BFRQ) may be used in wireless communications to facilitate recovery from beam failure. As used herein, the term "beam failure" may refer to failure of a beam, poor and / or degraded channel conditions on a beam, failed transmission on a beam, a beam having one or more parameters that do not meet a threshold, and the like. The UE may request beam failure recovery by sending an indication of a candidate beam, a new synchronization signal (SS) block, or a channel state information reference signal (CSI-RS) and initiating a random access control channel (RACH) procedure. In certain aspects, the indication may indicate one or more serving cells associated with the beam failure. For example, the indication may indicate one or more serving cells and corresponding candidate beams, SS blocks, or CSI-RS.

[0031] Typically, the BFR process may be performed for each serving cell. For example, as described above, the indication of beam failure may indicate the serving cell where the beam failure occurred and may indicate the candidate beam / SS block / CSI-RS for the serving cell. However, in a multiple transmit-receive point (TRP) deployment, a single serving cell may be provided by two TRPs, which may be associated with different communication links of the same UE. Therefore, if the beam failure instance indications received from the lower layers of the UE accumulate to meet the beam failure threshold, certain beam failure detection processes (e.g., per-serving cell beam failure detection processes) cannot detect which TRP is associated with the beam failure in a multi-TRP operation. Therefore, per-TRP beam recovery cannot be supported. If only per-serving cell beam failure detection is supported, the BS may need to perform beam recovery on both TRPs, or take other inefficient actions to remedy the beam failure.

[0032] The techniques and apparatus described herein provide configuration and signaling of beam failure information in a medium access control (MAC) control element (CE), which MAC-CE may be referred to herein as a multi-TRP BFR MAC CE. For example, a multi-TRP BFR MAC-CE may include a bitmap indicating one or more serving cells associated with a beam failure, the beam failure being associated with at least one of a first TRP or a second TRP. In certain aspects, the multi-TRP BFR MAC-CE indicates whether the beam failure is associated with a first TRP or a second TRP. In certain aspects, the multi-TRP BFR MAC-CE indicates a candidate beam for a first TRP or a second TRP, and indicates whether the candidate beam is associated with a first TRP or a second TRP. In this way, a UE may signal information indicating a TRP associated with a beam problem in a multi-TRP deployment, thereby facilitating TRP-specific beam recovery. For example, beam recovery may be performed via links associated with the remaining TRPs (e.g., TRPs associated with non-failed links) of a multi-TRP deployment. In this way, TRP-specific beam recovery is achieved, which improves the utilization of network resources and improves multi-TRP communications.

[0033] The various aspects of the present disclosure will be described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. Specifically, these aspects are provided to make the present disclosure detailed and complete, and to fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, regardless of whether these aspects are implemented independently of any other aspect of the present disclosure or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the disclosure is intended to cover devices or methods practiced using other structures, functionality, or structures and functionality as an addition to the various aspects of the disclosure set forth herein or in addition to the various aspects of the disclosure set forth herein. It should be understood that any aspect of the present disclosure may be embodied by one or more elements in the claims.

[0034] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying 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 on the specific application and the design constraints imposed on the overall system.

[0035] It should be noted that while various aspects may be described using terminology typically associated with 5G or NR radio access technologies (RATs), aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and / or RATs beyond 5G (e.g., 6G).

[0036] Figure 1 is a diagram illustrating an example of a wireless network 100 according to various aspects of the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, among others. The wireless network 100 may include a plurality of base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE), and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), and the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving this coverage area, depending on the context in which the term "cell" is used.

[0037] 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) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow limited 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 herein.

[0038] In some aspects, the cell may not necessarily be fixed, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the 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 through various types of backhaul interfaces such as direct physical connections or virtual networks using any suitable transport network.

[0039] 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 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 BS 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay BS may also be referred to as a relay station, a relay base station, a relay, or the like.

[0040] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, 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 high 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).

[0041] The network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0042] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be fixed or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. UEs may be cellular phones (e.g., smart phones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptop computers, cordless phones, wireless local loop (WLL) stations, tablets, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), entertainment devices (e.g., music or video devices, or satellite radios), vehicle-mounted components or sensors, smart meters / sensors, industrial manufacturing equipment, global positioning system devices, or any other suitable device configured to communicate via wireless or wired media.

[0043] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity, for example, for 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 (Customer Premises Equipment, CPE). UE 120 may be included in a housing that houses components (such as processor components and / or memory components) of UE 120. In some aspects, a processor component and a memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0044] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific 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.

[0045] In certain 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 for communicating with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol or vehicle-to-infrastructure (V2I) protocol), and / or mesh network. 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.

[0046] The devices of the wireless network 100 can communicate using an electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc. based on frequency or wavelength. For example, the devices of the wireless network 100 can communicate using an operating band having a first frequency range (FR1) that can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating band having a second frequency range (FR2) that can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although portions of FR1 are greater than 6 GHz, FR1 is often referred to as a "below 6 GHz" band. Similarly, FR2 is often referred to as a "millimeter wave" band, although it is different from an extremely high frequency (EHF) band (30 GHz–300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specifically stated, it should be understood that, if used herein, the term "below 6 GHz" or the like can broadly represent frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specifically stated, it should be understood that if used herein, the term "millimeter wave" or the like can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0047] As mentioned above, Figure 1 are provided as examples. Other examples may differ from those regarding Figure 1 An example of description.

[0048] Figure 2is a diagram illustrating an example 200 of base station 110 and UE 120 communicating in wireless network 100 in accordance with various aspects of the present disclosure. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 254a through 254r, where in general T≥1 and R≥1.

[0049] 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 each UE based at least in part on the (one or more) 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)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) 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) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process the output sample stream (e.g., convert to analog, amplify, filter, and upconvert) to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively.

[0050] 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, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, 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 received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120 to the data sink 260, and provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a channel quality indicator (CQI) parameter, etc. In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0051] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0052] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). 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, where applicable, further processed by demodulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In certain aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulators and / or demodulators 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform operations described herein (eg, as described with reference to Figure 3-Figure 13 Aspects of any of the methods described).

[0053] 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 where applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent 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 base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communication. In certain aspects, the base station 110 includes a transceiver. The transceiver may include any combination of (one or more) antennas 234, modulators and / or demodulators 232, MIMO detectors 236, receive processors 238, transmit processors 220, and / or TX MIMO processors 230. The transceiver may be used by a processor (eg, controller / processor 240) and memory 242 to perform operations described herein (eg, as described with reference to Figure 3-Figure 13 Aspects of any of the methods described).

[0054] As described in greater detail elsewhere herein, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other (one or more) components of the UE 120 may perform one or more techniques associated with MAC signaling for TRP-specific BFRs. 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(s) of may perform or direct e.g. Fig.12 The process 1200 Fig.13 1300 and / or operations of 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 (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, conversion, and / or interpretation), may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Fig.12 The process 1200 Fig.13The process 1300 of , and / or operations of other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among others.

[0055] In certain aspects, the UE includes: a component for configuring a MAC-CE to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more serving cells; or a component for sending a MAC-CE to a base station via at least one serving cell. The components for the UE to perform the operations described herein may include, for example, one or more of an antenna 252, a demodulator 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, a TX MIMO processor 266, a modulator 254, a controller / processor 280, or a memory 282.

[0056] In certain aspects, the UE includes means for configuring a bitmap in a MAC-CE, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated serving cell in one or more serving cells for a first TRP, and wherein a second bit group of the bitmap indicates whether a beam failure has occurred on an associated serving cell in one or more serving cells for a second TRP.

[0057] In certain aspects, the UE includes components for configuring one or more bytes associated with one or more serving cells in a MAC-CE, wherein the one or more bytes associated with a TRP in a first TRP and a second TRP and a serving cell in one or more serving cells include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell (e.g., a beam status), and a second field for an indication of the new beam.

[0058] In certain aspects, the UE includes components for configuring a MAC-CE based at least in part on a beam failure occurring for a particular cell, wherein the MAC-CE omits a field indicating whether a byte includes an indication of a new beam for the particular cell based at least in part on the beam failure occurring for the particular cell.

[0059] In certain aspects, the UE includes components for configuring a bitmap in a MAC-CE, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated serving cell in one or more serving cells, wherein a second bit group of the bitmap indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams, and wherein a third bit group of the bitmap indicates whether the single new beam is associated with a first TRP or a second TRP.

[0060] In certain aspects, the UE includes a component for configuring a subsequent set of bytes associated with a serving cell in a MAC-CE, wherein the bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell (e.g., beam status), and a second field for the indication of the new beam.

[0061] In certain aspects, the UE includes components for configuring bytes in a MAC-CE, wherein a first field of the byte indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams for a serving cell in one or more serving cells, wherein a second field of the byte indicates whether the single new beam is associated with a first TRP or a second TRP of the serving cell, and wherein a third field of the byte indicates a serving cell identifier of the serving cell.

[0062] In certain aspects, the UE includes a component for configuring a subsequent set of bytes associated with a serving cell in a MAC-CE, wherein the bytes in the subsequent set of bytes associated with a TRP in a first TRP and a second TRP and a serving cell in one or more serving cells include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell (e.g., beam status), and a second field for an indication of the new beam.

[0063] In certain aspects, the base station includes a component for receiving a MAC-CE indicating beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more serving cells; or a component for performing a beam failure recovery operation based at least in part on the beam failure information. The components for the base station to perform the operations described herein may include, for example, one or more of the transmit processor 220, the TX MIMO processor 230, the modulator 232, the antenna 234, the demodulator 232, the MIMO detector 236, the receive processor 238, the controller / processor 240, the memory 242, or the scheduler 246.

[0064] Although Figure 2 The blocks in the 200 and 210 are shown as distinct components, but the functionality described above with respect to these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed or under the control of the controller / processor 280.

[0065] As mentioned above, Figure 2 are provided as examples. Other examples may differ from those regarding Figure 2 An example of description.

[0066] Figure 3 An example logical architecture of a distributed RAN 300 is shown in accordance with aspects of the present disclosure.

[0067] The 5G access node 305 may include an access node controller 310. The access node controller 310 may be a central unit (CU) of the distributed RAN 300. In certain aspects, a backhaul interface to a 5G core network 315 may terminate at the access node controller 310. The 5G core network 315 may include a 5G control plane component 320 and a 5G user plane component 325 (e.g., a 5G gateway), and a backhaul interface for one or both of the 5G control plane and the 5G user plane may terminate at the access node controller 310. Additionally or alternatively, a backhaul interface to one or more neighboring access nodes 330 (e.g., another 5G access node 305, an LTE access node, etc.) may terminate at the access node controller 310.

[0068] The access node controller 310 may include and / or may communicate with one or more TRPs 335 (e.g., via an F1 control (F1-C) interface and / or an F1 user (F1-U) interface). The TRP 335 may be a distributed unit (DU) of the distributed RAN 300. In some aspects, the TRP 335 may correspond to the TRP 335 described above in conjunction with Figure 1 The base station 110 described herein may be a base station 110. For example, different TRPs 335 may be included in different base stations 110. Additionally or alternatively, multiple TRPs 335 may be included in a single base station 110. In some aspects, a base station 110 may include a CU (e.g., an access node controller 310) and / or one or more DUs (e.g., one or more TRPs 335). In some cases, a TRP 335 may be referred to as a cell, a panel, an antenna array, an array, etc.

[0069] The TRP 335 may be connected to a single access node controller 310 or to multiple access node controllers 310. In some aspects, dynamic configuration of split logical functions may exist within the architecture of the distributed RAN 300. For example, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, etc. may be configured to terminate at the access node controller 310 or at the TRP 335. In general, the TRP 335 may handle the physical layer logical functions of the distributed RAN 300. In some aspects, the TRP 335 may receive MAC signaling, such as a MAC control element related to beam failure, and the TRP 335 may forward the MAC signaling to the access node controller 310 or may process the MAC signaling locally.

[0070] In certain aspects, multiple TRPs 335 may transmit communications (e.g., the same communication or different communications) in the same transmit time interval (TTI) (e.g., time slot, mini-slot, subframe, symbol, etc.) or in different TTIs using different quasi-co-location (QCL) relationships (e.g., different spatial parameters, different transmit configuration indicator (TCI) states, different precoding parameters, different beamforming parameters, etc.). In certain aspects, the TCI state may be used to indicate one or more QCL relationships. A TRP 335 may be configured to serve traffic to a UE 120 individually (e.g., using dynamic selection) or jointly (e.g., using joint transmission with one or more other TRPs 335).

[0071] As mentioned above, Figure 3 are provided as examples. Other examples may differ from those regarding Figure 3 An example of description.

[0072] Figure 4 4 is a diagram illustrating an example 400 of multi-TRP communication (sometimes referred to as multi-panel communication) in accordance with various aspects of the present disclosure. Figure 4 As shown, multiple TRPs 405 can communicate with the same UE 120. TRP 405 can correspond to the above combined Figure 3 Description of TRP 335.

[0073] Multiple TRPs 405 (shown as TRP A and TRP B) can communicate with the same UE 120 in a coordinated manner (e.g., using coordinated multipoint transmission, etc.) to improve reliability, increase throughput, etc. The TRPs 405 can coordinate such communications via an interface between the TRPs 405 (e.g., a backhaul interface, an access node controller 310, etc.). The interface can have less latency and / or higher capacity when the TRPs 405 are co-located at the same base station 110 (e.g., when the TRPs 405 are different antenna arrays or panels of the same base station 110), and can have greater latency and / or lower capacity (compared to co-location) when the TRPs 405 are located at different base stations 110. Different TRPs 405 can communicate with the UE 120 using different QCL relationships (e.g., different TCI states), different demodulation reference signal (DMRS) ports, different layers (e.g., of multi-layer communications), etc.

[0074] In a first multi-TRP transmission mode (e.g., Mode 1), a single physical downlink control channel (PDCCH) can be used to schedule downlink data communications for a single physical downlink shared channel (PDSCH). In this case, multiple TRPs 405 (e.g., TRP A and TRP B) can send communications to UE 120 on the same PDSCH. For example, communications can be sent using a single codeword with different spatial layers for different TRPs 405 (e.g., one of the codewords is mapped to a first set of layers sent by a first TRP 405 and mapped to a second set of layers sent by a second TRP 405). As another example, communications can be sent using multiple codewords, where different codewords are sent by different TRPs 405 (e.g., using different sets of layers). In either case, different TRPs 405 can use different QCL relationships (e.g., different TCI states) for different DMRS ports corresponding to different layers. For example, the first TRP 405 may use a first QCL relationship or a first TCI state for a first DMRS port set corresponding to a first layer set, and the second TRP 405 may use a second (different) QCL relationship or a second (different) TCI state for a second (different) DMRS port set corresponding to a second (different) layer set. In certain aspects, the TCI state in the downlink control information (DCI) (e.g., sent on the PDCCH, such as DCI format 1_0, DCI format 1_1, etc.) may indicate a first QCL relationship (e.g., by indicating a first TCI state) and a second QCL relationship (e.g., by indicating a second TCI state). The first TCI state and the second TCI state may be indicated using a TCI field in the DCI. Typically, the TCI field may indicate a single TCI state (for single TRP transmission) or multiple TCI states (for multi-TRP transmission as discussed herein) in this multi-TRP transmission mode (e.g., mode 1).

[0075] In a second multi-TRP transmission mode (e.g., Mode 2), multiple PDCCHs may be used to schedule downlink data communications for multiple corresponding PDSCHs (e.g., one PDCCH for one PDSCH). In this case, the first PDCCH may schedule a first codeword to be transmitted by the first TRP 405, and the second PDCCH may schedule a second codeword to be transmitted by the second TRP 405. In addition, a first DCI (e.g., transmitted by the first TRP 405) may schedule a first PDSCH communication associated with a first DMRS port set having a first QCL relationship (e.g., indicated by a first TCI state) for the first TRP 405, and a second DCI (e.g., transmitted by the second TRP 405) may schedule a second PDSCH communication associated with a second DMRS port set having a second QCL relationship (e.g., indicated by a second TCI state) for the second TRP 405. In this case, the DCI (e.g., having DCI format 1_0, DCI format 1_1, etc.) may indicate a corresponding TCI state for the TRP 405 corresponding to the DCI. The TCI field of the DCI indicates a corresponding TCI state (eg, the TCI field of the first DCI indicates a first TCI state, and the TCI field of the second DCI indicates a second TCI state).

[0076] If a beam failure occurs on one of the links between UE 120 and TRP 405, UE 120 may need to indicate such beam failure to BS 110 associated with TRP 405. For example, UE 120 may use MAC signaling (such as a MAC control element (CE)) to indicate beam failure. However, a conventional MAC-CE for indicating beam failure cannot provide information about the TRP associated with the beam failure. Since two TRPs may be associated with the same MAC layer logical entity, this ambiguity may result in inappropriate mitigation actions, network inefficiency, and inappropriate utilization of multi-TRP resources. Certain techniques and apparatus described herein enable configuration and provision of a MAC-CE (e.g., a multi-TRP BFRMAC-CE) indicating a TRP associated with a beam failure. Therefore, the network may take appropriate actions to mitigate beam failure, such as beam failure recovery actions.

[0077] As mentioned above, Figure 4 are provided as examples. Other examples may differ from those regarding Figure 4 An example of description.

[0078] Figure 55 is a diagram illustrating an example 500 of TRP differentiation at a UE based at least in part on a control resource set (CORESET) pool index in accordance with various aspects of the present disclosure. In certain aspects, a CORESET pool index (or CORESETPoolIndex) value may be used by a UE (UE 120) to identify a TRP associated with an uplink grant received on a PDCCH.

[0079] A CORESET is a control region that can be constructed to support efficient use of resources, such as by flexibly configuring or reconfiguring resources for one or more PDCCHs associated with a UE. In certain aspects, a CORESET may occupy the first symbol of an orthogonal frequency division multiplexing (OFDM) slot, the first two symbols of an OFDM slot, or the first three symbols of an OFDM slot. Thus, a CORESET may include multiple RBs in the frequency domain, and one, two, or three symbols in the time domain. In 5G, the amount of resources included in a CORESET may be flexibly configured, such as by using radio resource control (RRC) signaling to indicate a frequency domain region (e.g., the amount of resource blocks) or a time domain region (e.g., the amount of symbols) used for a CORESET.

[0080] like Figure 5 As shown, UE 120 may be configured with multiple CORESETs in a given serving cell. Each CORESET configured for UE 120 may be associated with a CORESET identifier (CORESET ID). For example, a first CORESET configured for UE 120 may be associated with CORESET ID 1, a second CORESET configured for UE 120 may be associated with CORESET ID 2, a third CORESET configured for UE 120 may be associated with CORESET ID 3, and a fourth CORESET configured for UE 120 may be associated with CORESET ID 4.

[0081] like Figure 5 As further shown in , two or more (e.g., up to five) CORESETs may be grouped into CORESET pools. Each CORESET pool may be associated with a CORESET pool index. As an example, CORESET ID 1 and CORESET ID 2 may be grouped into CORESET pool index 0, and CORESET ID 3 and CORESET ID 4 may be grouped into CORESET pool index 1. In a multi-TRP configuration, each CORESET pool index value may be associated with a particular TRP 505. As an example, and as Figure 5As shown, the first TRP 505 (TRP A) may be associated with CORESET pool index 0, and the second TRP 505 (TRP B) may be associated with CORESET pool index 1. The UE 120 may be configured with information identifying an association between a TRP and a CORESET pool index value assigned to the TRP through a higher layer parameter, such as PDCCH-Config. Accordingly, the UE may identify the TRP that sent the DCI uplink grant by determining the CORESET ID of the CORESET in which the PDCCH carrying the DCI uplink grant was sent, determining the CORESET pool index value associated with the CORESET pool in which the CORESET ID is included, and identifying the TRP associated with the CORESET pool index value.

[0082] As mentioned above, Figure 5 are provided as examples. Other examples may differ from those regarding Figure 5 An example of description.

[0083] Figure 6 600 is a diagram illustrating an example of signaling associated with beam failure recovery for a multi-TRP deployment using a multi-TRP BFR MAC-CE in accordance with various aspects of the present disclosure. As shown, the example 600 includes a UE 120, a BS 110, and TRP A and TRP B. TRP A and TRP B may include a TRP 335, a TRP 405, or a TRP 505. BS 110 may handle higher layer functions for TRP A and TRP B. For example, BS 110 may be a gNB associated with TRP A and TRP B, an access node controller 310 associated with TRP A and TRP B, and the like. BS 110 may provide one or more service cells, and TRP A and TRP B may handle physical layer communications for the one or more service cells.

[0084] As shown, UE 120 is associated with a link utilizing TRP A and a link utilizing TRP B. The links between the UE and TRP A and TRP B may be maintained using beam pairs. The beam pairs may include UE-side beams and BS-side beams, such as a UE-side transmit beam and a BS-side receive beam for uplink communication or a UE-side receive beam and a BS-side transmit beam for downlink communication.

[0085] As indicated by reference numeral 610, UE 120 may detect a beam failure on a link utilizing TRP A. For example, UE 120 may determine a failure of a beam, poor and / or degraded channel conditions on a beam, a failed transmission on a beam, a beam having one or more parameters that do not meet a threshold, etc. As another example, UE 120 may determine that a number of beam failure notifications from lower layers of UE 120 meets a threshold within a configured timer and may thereby declare a beam failure on a link utilizing TRP A.

[0086] As indicated by reference numeral 620, UE 120 may configure a MAC-CE to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with TRP A. The MAC-CE may be referred to herein as a multi-TRP BFR MAC-CE. The beam failure information may indicate whether the beam failure is associated with TRP A or TRP B. For example, the beam failure information may indicate which TRP among a plurality of TRPs associated with the serving cell is associated with the beam failure. In example 600, the multi-TRP BFR MAC-CE indicates that a beam failure has occurred with respect to a serving cell provided by BS 110, and indicates that the beam failure is associated with TRP B. For a more detailed description of the multi-TRP BFR MAC-CE shown by reference numeral 620, refer to Figure 7-Figure 11 .

[0087] In certain aspects, UE 120 may identify a candidate beam for a link associated with TRP A. For example, UE 120 may identify the candidate beam based at least in part on a measurement associated with the candidate beam (e.g., determined by measuring a synchronization signal block of a beam transmitted by TRP A, etc.) satisfying a threshold, or based at least in part on the candidate beam being a best beam among a plurality of beams measured by UE 120. If UE 120 identifies a candidate beam for a link associated with TRP A, UE 120 may configure a multi-TRP BFR MAC-CE to indicate the candidate beam for the link associated with TRP A, as in conjunction with Figure 7-Figure 12 If UE 120 does not identify a candidate beam for a link associated with TRP A, UE 120 may configure the multi-TRP BFR MAC-CE to omit information indicating the candidate beam (e.g., the multi-TRP BFR MAC-CE may indicate that there is no candidate beam). The information indicating the candidate beam or the absence of a candidate beam included in the multi-TRP BFR MAC-CE is referred to herein as a beam state. Figure 7-Figure 11 As shown, the beam state for serving cell N and TRP Y is determined by Beam State-C N-YIf the beam status indicates that there is no candidate beam, the field for the beam status may include a reserved bit (R).

[0088] As indicated by reference numeral 630, UE 120 may send a multi-TRP BFR MAC-CE. For example, UE 120 may send the multi-TRP BFR MAC-CE via a link associated with TRP B. Typically, UE 120 may send the multi-TRP BFR MAC-CE via a non-failed link between UE 120 and BS 110. As shown, TRP B may relay the multi-TRP BFR MAC-CE to BS 110. For example, TRP B may provide the multi-TRP BFR MAC-CE to a higher layer (e.g., a MAC layer) of BS 110 for processing by BS 110.

[0089] As indicated by reference numeral 640, BS 110 may perform beam failure recovery for a failed link (e.g., a link associated with TRP A) based at least in part on the multi-TRP BFR MAC-CE. For example, since the multi-TRP BFR MAC-CE indicates that the beam failure is associated with a link provided by TRP A, BS 110 may perform beam failure recovery specific to TRP A. Thus, BS 110 may improve utilization of network resources that would otherwise be used to perform beam recovery for all TRPs associated with BS 110 based at least in part on the failure of a single TRP.

[0090] As mentioned above, Figure 6 are provided as examples. Other examples may differ from those regarding Figure 6 An example of description.

[0091] Figure 7-Figure 11 is a diagram illustrating an example of a multi-TRP BFRMAC-CE indicating beam failure information according to various aspects of the present disclosure. Figure 7-Figure 11 It shows that Figure 6 Examples 700 , 800 , 900 , 1000 , 1100 , and 1105 of a configured MAC-CE are shown in FIG. 620 .

[0092] In certain aspects, a bitmap may indicate the serving cell and TRP associated with a beam failure. Figure 7As shown, in some examples, the multi-TRP BFR MAC-CE may include multiple bytes or 8-bit bytes. One or more bytes of the multi-TRP BFR MAC-CE may include a bitmap. The first bit group (e.g., the first byte) of the multi-TRP BFR MAC-CE may be associated with a first TRP, and the second bit group (e.g., the second byte) of the multi-TRP BFR MAC-CE may be associated with a second TRP. For example, each bit in the first bit group may indicate whether a beam failure has occurred for the corresponding service cell with respect to the first TRP, and each bit in the second bit group may indicate whether a beam failure has occurred for the corresponding service cell with respect to the second TRP. For example, each bit in the bitmap may correspond to a corresponding service cell among the multiple service cells (e.g., bit C1 may correspond to the first service cell, bit C2 may correspond to the second service cell, and so on). If bit C 1-0 is activated or set to a specific value, this may indicate a beam failure on TRP 1 with respect to serving cell 1. In certain aspects, the multi-TRP BFRMAC-CE of example 700 may be used to indicate a beam failure on a secondary cell (SCell) of UE 120.

[0093] The multi-TRP BFR MAC-CE may include additional bytes to indicate candidate beam information for multiple service cells. Each additional byte may be associated with multiple service cells and corresponding service cells and TRPs in the first TRP and the second TRP. Each additional byte may include an "AC" field of one or more bits. The value indicated by the AC field may indicate whether the candidate beam is indicated for the service cell and TRP associated with the additional byte. For example, a value of 1 for the AC field in a byte associated with cell 1 (e.g., C1) and the first TRP may indicate that the byte includes a candidate beam indication for cell 1 and the first TRP in another field, and a value of 0 for the AC field in a byte associated with cell 1 and the first TRP may indicate that the byte does not include a candidate beam indication for cell 1 and the first TRP. As another example, a value of 0 for the AC field in a byte associated with cell 1 (e.g., C1) and a first TRP may indicate that the byte includes a candidate beam indication for cell 1 and the first TRP in another field, and a value of 1 for the AC field in a byte associated with cell 1 and the first TRP may indicate that the byte does not include a candidate beam indication for cell 1 and the first TRP. N may be equal to the number of cells whose beam failures are notified based at least in part on bitmap signaling. For example, if four cells / TRPs are associated with beam failures, there may be 4 candidate beam indicators (if candidate beams have been. In this way, if the value indicated by the AC field for a byte indicates that the byte does not include a candidate beam indication, the base station 110 may stop reading the byte after reading the AC field, which saves processing and memory resources and reduces waiting time when processing a multi-TRP BFR MAC-CE. Each additional byte may also include one or more reserved bits, which are indicated by an "R".

[0094] In certain aspects, the byte may include an SP bit. The SP bit may indicate whether the beam failure is associated with a specific cell of the MAC entity. The specific cell may include a primary cell (PCell) of a primary cell group (MCG) of the UE, or a primary secondary cell (PSCell) of a secondary cell group (SCG) of the UE. In certain aspects, as part of a random access procedure, when a multi-TRP BFR MAC-CE or a truncated BFR MAC CE is to be included in a MAC protocol data unit (PDU), the SP field is set to a value (e.g., 1) to indicate that a beam failure is detected only for the SpCell. In example 700, the multi-TRP BFR MAC-CE includes two SP bits: a first SP bit corresponding to a first TRP and a second SP bit corresponding to a second TRP.

[0095] Figure 8Example 800 shows an example of a multi-TRP BFR MAC-CE that can be used to indicate a beam failure for a SPcell. For example, if BFR is triggered for a TRP in a SpCell, the UE may send a multi-TRP BFR MAC-CE with an SP bit (e.g., SP0) set to a certain value. In addition, in some aspects, the multi-TRP BFR MAC-CE may omit SP1. For example, the multi-TRP BFR MAC-CE may include only SP0 and may include a reserved bit (R) in place of SP1. By including a single SP bit, the UE 120 may report a per-cell beam failure for the SpCell instead of reporting a per-TRP beam failure for the SpCell. This may be beneficial in situations where the SpCell is particularly important, and may save multi-TRP BFR MAC-CE overhead relative to specifying per-TRP beam failure information indicating whether each TRP is associated with the SpCell (e.g., since the network may want to recover the SpCell based on only a single TRP configuration, the second TRP in the SpCell and the associated candidate beams may not be critical in the initial stage). In certain aspects, in example 800, the multi-TRP BFR MAC-CE may omit the candidate beam information. For example, the UE may send the multi-TRP BFR MAC-CE with the SP bit indicating the failure of the SpCell via a random access channel (RACH). Since the UE 120 selects the best beam with RACH association to perform the RACH procedure, the indication of the candidate beams may be redundant. Therefore, the UE 120 may save resources that would otherwise be used to provide the indication of the candidate beams.

[0096] Fig. 9 Example 900 shows an example in which the multi-TRP BFR MAC-CE indicates that the same candidate beam is detected for two TRPs of a cell. In example 900, if both TRPs are associated with beam failure (as indicated by the bitmap), the "P" bit associated with the candidate beam identifier may indicate whether the same beam (or no beam) will be used for both TRPs of the serving cell. For example, if both TRPs associated with the serving cell associated with byte 910 are associated with beam failure, if P is set to 1, the bytes following byte 910 including P may not exist. Therefore, if two TRPs are associated with the same candidate beam, or if no candidate beam is identified for both TRPs, the multi-TRP BFR MAC-CE may reduce overhead.

[0097] Fig.10Example 1000 shows an example of prioritizing indications of beam states based at least in part on corresponding TRPs. In example 1000, UE 120 may report candidate beams (if detected) for a first failure TRP for each serving cell (if any) in a first byte set 1010, and may subsequently report candidate beams (if detected) for a second failure TRP for each serving cell (if any) in a second byte set 1020. For example, UE 120 may prioritize the beam state associated with the first failure TRP over the beam state associated with the second failure TRP. In some aspects, the first failure TRP is a TRP associated with a first control source set (CORESET) pool index (e.g., 0), and the second failure TRP is a TRP associated with a second CORESET pool index (e.g., 1). In some aspects, the first failure TRP is a primary TRP, and the second failure TRP is a non-primary TRP. In some aspects, the first failure TRP is a TRP that sends control signaling or broadcast signaling for a common message. Therefore, beam failure recovery for the first failed TRP can be prioritized over beam failure recovery for the second failed TRP. Prioritizing beam failure recovery for the first failed TRP can improve the operation of the network and can be beneficial in situations where uplink resources are limited (e.g., for truncated multi-TRP BFR MAC-CE and / or when the uplink grant for the multi-TRP BFR MAC-CE is small). For example, the primary TRP (e.g., the first failed TRP) can typically carry control signaling (such as cell definition SSB), so the reliability of the primary TRP can be more important than the reliability of non-primary TRPs. In addition, the network can typically first configure a single TRP (e.g., the primary TRP) for the UE 120, and if conditions require adding a second TRP, a non-primary (e.g., secondary) TRP can be added. In this sense, it is beneficial to prioritize the recovery of the primary TRP over the secondary TRP. Therefore, in the case of a truncated MAC-CE, if the uplink grant for the MAC-CE is small, it is beneficial to first report the candidate beams for the first / primary TRP for each failed SCell.

[0098] Fig.11Examples 1100 and 1105 show examples in which the first bit group of the bitmap indicates whether a beam failure has occurred on the associated serving cell, and the second bit group of the bitmap indicates whether a subsequent set of bytes indicates a single beam state or multiple beam states. In addition, if the second bit group indicates a single beam state, the third bit group may indicate whether the single beam state is associated with a first TRP or a second TRP. For example, the first bit group is indicated by C, the second bit group is indicated by S, and the third bit group is indicated by T. In example 1100, S and T are provided as part of a bitmap that includes C. In example 1105, S and T are provided in association with a serving cell identifier to which they apply, and one or more beam states (e.g., for one or more TRPs associated with the serving cell identifier) ​​are provided in association with the serving cell identifier. A first value of the S field (e.g., 0) may indicate that a single beam state is present in a subsequent set of bytes, and that BS 110 will check the T field. A second value of the S field (e.g., 1) may indicate that there are multiple beam states in the subsequent set of bytes, and thus BS 110 may ignore the T field. The T field may be valid only if the S field is set to a first value. If T is set to a first value, T indicates that a single beam state is associated with a first TRP, and if T is set to a second value, T indicates that a single beam state is associated with a second TRP. For example, the first value and the second value of T may correspond to the CORESET pool indexes of the first TRP and the second TRP.

[0099] As mentioned above, Figure 7-Figure 11 is provided as one or more examples. Other examples may differ from those regarding Figure 7-Figure 11 An example of description.

[0100] Fig.12 1 is a diagram illustrating an example process 1200, for example, performed by a UE, according to various aspects of the present disclosure. Example process 1200 is an example of operations in which a UE (eg, UE 120) performs operations associated with beam failure recovery medium access control signaling for a multiple transmit-receive point system.

[0101] like Fig.12 As shown, in certain aspects, process 1200 may include configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells (block 1210). For example, as described above, a UE (e.g., using Fig.14The MAC signaling component 1408 depicted in the figure can configure a MAC-CE (e.g., a multi-TRP BFR MAC-CE) to indicate beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more service cells.

[0102] like Fig.12 As further shown, in certain aspects, process 1200 may include sending a MAC-CE to a base station via at least one serving cell (block 1220). For example, as described above, a UE (e.g., using Fig.14 The sending component 1404 depicted in the figure can send a MAC-CE to a base station via at least one serving cell.

[0103] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0104] In a first aspect, configuring the MAC-CE also includes configuring a bitmap in the MAC-CE, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells for a first TRP, and wherein a second bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells for a second TRP.

[0105] In a second aspect, alone or in combination with the first aspect, process 1200 includes configuring one or more bytes associated with one or more service cells in a MAC-CE, wherein the one or more bytes associated with a TRP in a first TRP and a second TRP and a service cell in one or more service cells include a first field indicating whether the byte includes an indication of a new beam for the TRP and the service cell, and a second field for an indication of the new beam.

[0106] In a third aspect, alone or in combination with one or more of the first and second aspects, the byte includes a third field indicating whether two TRPs associated with a serving cell are associated with the same beam state, and wherein if the third field indicates that the two TRPs are associated with the same beam state, the MAC-CE omits another byte associated with another TRP in the first TRP and the second TRP other than the TRP associated with the byte.

[0107] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, one or more bytes are configured such that an indication of a new beam associated with a first TRP takes precedence over an indication of a new beam associated with a second TRP.

[0108] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the MAC-CE includes a bit indicating whether beam failure has occurred for a specific cell among the one or more serving cells.

[0109] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, configuring the MAC-CE also includes configuring the MAC-CE based at least in part on a beam failure occurring for a specific cell, wherein the MAC-CE omits a field indicating whether the byte includes an indication of a new beam for the specific cell based at least in part on the beam failure occurring for the specific cell.

[0110] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, configuring the MAC-CE also includes configuring a bitmap in the MAC-CE, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells, wherein a second bit group of the bitmap indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams, and wherein a third bit group of the bitmap indicates whether the single new beam is associated with a first TRP or a second TRP.

[0111] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the third bit group is valid only if the second bit group indicates that the subsequent set of bytes indicates a single new beam.

[0112] In a ninth aspect, alone or in combination with one or more of aspects 1 to 8, process 1200 includes configuring a subsequent set of bytes associated with a serving cell in a MAC-CE, wherein the bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell, and a second field for an indication of the new beam.

[0113] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, configuring the MAC-CE also includes configuring a byte in the MAC-CE, wherein the first field of the byte indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams for a service cell in one or more service cells, wherein the second field of the byte indicates whether the single new beam is associated with a first TRP or a second TRP of the service cell, and wherein the third field of the byte indicates a service cell identifier of the service cell.

[0114] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the second field is valid only if the first field indicates that the subsequent set of bytes indicates a single new beam.

[0115] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, process 1200 includes configuring a subsequent set of bytes associated with a serving cell in a MAC-CE, wherein the bytes in the subsequent set of bytes associated with a TRP in a first TRP and a second TRP and a serving cell in one or more serving cells include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell, and a second field for an indication of the new beam.

[0116] Although Fig.12 Example blocks of process 1200 are shown, but in some aspects, Fig.12 The process 1200 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1200. Additionally or alternatively, two or more of the blocks of the process 1200 may be performed in parallel.

[0117] Fig.13 1 is a diagram illustrating an example process 1300, for example, performed by a base station, in accordance with various aspects of the present disclosure. Example process 1300 is an example of operations in which a base station (eg, base station 110) performs operations associated with beam failure recovery medium access control signaling for a multiple transmit-receive point system.

[0118] like Fig.13 As shown, in certain aspects, process 1300 may include receiving a MAC-CE indicating beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more serving cells (block 1310). For example, as described above, a base station (e.g., using Fig.15 The receiving component 1502 depicted in the figure can receive a MAC-CE (e.g., a multi-TRPBFR MAC-CE) indicating beam failure information for one or more service cells, wherein the beam failure information is associated with at least one of the first TRP or the second TRP of the one or more service cells.

[0119] like Fig.13 As further shown in FIG. 1 , in some aspects, process 1300 may include performing a beam failure recovery operation based at least in part on the beam failure information (block 1320). For example, as described above, a base station (e.g., using Fig.15 The BFR component 1508 depicted in FIG. 1 may perform beam failure recovery operations based at least in part on the beam failure information.

[0120] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0121] In a first aspect, the MAC-CE includes a bitmap, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells for a first TRP, and wherein a second bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells for a second TRP.

[0122] In a second aspect, alone or in combination with the first aspect, the MAC-CE includes one or more bytes associated with one or more service cells, wherein the one or more bytes associated with a TRP in a first TRP and a second TRP and a service cell in one or more service cells include a first field indicating whether the byte includes an indication of a new beam for the TRP and the service cell, and a second field for an indication of the new beam.

[0123] In a third aspect, alone or in combination with one or more of the first and second aspects, the byte includes a third field indicating whether two TRPs associated with a serving cell are associated with the same beam state, and wherein if the third field indicates that the two TRPs are associated with the same beam state, the MAC-CE omits another byte associated with another TRP in the first TRP and the second TRP other than the TRP associated with the byte.

[0124] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, one or more bytes are configured such that an indication of a new beam associated with a first TRP takes precedence over an indication of a new beam associated with a second TRP.

[0125] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the MAC-CE includes a bit indicating whether beam failure has occurred for a specific cell among the one or more serving cells.

[0126] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the MAC-CE omits a field indicating whether the byte includes an indication of a new beam for a specific cell based at least in part on a beam failure occurring for the specific cell.

[0127] In a seventh aspect, alone or in combination with one or more of aspects 1 to 6, the MAC-CE includes a bitmap, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell in one or more service cells, wherein a second bit group of the bitmap indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams, and wherein a third bit group of the bitmap indicates whether the single new beam is associated with a first TRP or a second TRP.

[0128] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the third bit group is valid only if the second bit group indicates that the subsequent set of bytes indicates a single new beam.

[0129] In the ninth aspect, alone or in combination with one or more of the first to eighth aspects, the MAC-CE includes a subsequent set of bytes associated with the serving cell, wherein the bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell, and a second field for an indication of the new beam.

[0130] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the MAC-CE includes a byte, wherein a first field of the byte indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams for a serving cell in one or more serving cells, wherein a second field of the byte indicates whether the single new beam is associated with a first TRP or a second TRP of the serving cell, and wherein a third field of the byte indicates a serving cell identifier of the serving cell.

[0131] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the second field is valid only if the first field indicates that the subsequent set of bytes indicates a single new beam.

[0132] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the MAC-CE includes a subsequent set of bytes associated with a serving cell, wherein the bytes in the subsequent set of bytes associated with a TRP in a first TRP and a second TRP and a serving cell in one or more serving cells include a first field indicating whether the bytes include an indication of a new beam for the TRP and the serving cell, and a second field for an indication of the new beam.

[0133] Although Fig.13 Example blocks of process 1300 are shown, but in some aspects, Fig.13 The process 1300 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1300. Additionally or alternatively, two or more of the blocks of the process 1300 may be performed in parallel.

[0134] Fig.141 is a block diagram of an example apparatus 1400 for wireless communication. Apparatus 1400 may be a UE, or a UE may include apparatus 1400. In certain aspects, apparatus 1400 includes a receiving component 1402 and a transmitting component 1404 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1400 may communicate with another apparatus 1406 (such as a UE, a base station, or another wireless communication device) using receiving component 1402 and transmitting component 1404. As further shown, apparatus 1400 may include a MAC signaling component 1408, among others.

[0135] In certain aspects, the apparatus 1400 may be configured to perform the Figure 3-Figure 11 Additionally or alternatively, the apparatus 1400 may be configured to perform one or more processes described herein, such as Fig.12 The process 1200. In some aspects, Fig.14 The device 1400 and / or one or more components shown may include the above-mentioned Figure 2 Additionally or alternatively, Fig.14 One or more of the components shown may be implemented in combination with the above Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0136] The receiving component 1402 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the apparatus 1406. The receiving component 1402 may provide the received communications to one or more other components of the apparatus 1400. In some aspects, the receiving component 1402 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the apparatus 1406. In some aspects, the receiving component 1402 may include the above in combination with Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a UE are described.

[0137] The transmitting component 1404 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1406. In some aspects, one or more other components of the device 1406 may generate communications and may provide the generated communications to the transmitting component 1404 for transmission to the device 1406. In some aspects, the transmitting component 1404 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1406. In some aspects, the transmitting component 1404 may include the above in combination with Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 1404 can be co-located with the receive component 1402 in a transceiver.

[0138] The MAC signaling component 1408 may configure a MAC-CE to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more serving cells. The MAC signaling component 1408 may include a controller / processor 280, a transmit processor 264, a TX MIMO processor 266, a MOD 254, an antenna 252, etc. The transmit component 1404 may transmit a MAC-CE to a base station via at least one serving cell.

[0139] The MAC signaling component 1408 can configure one or more bytes associated with one or more service cells in the MAC-CE, wherein the one or more bytes associated with the TRP in the first TRP and the second TRP and the service cells in the one or more service cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the service cell, and a second field for the indication of the new beam.

[0140] The MAC signaling component 1408 can configure a subsequent set of bytes associated with the serving cell in the MAC-CE, wherein the bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and a second field for the indication of the new beam.

[0141] The MAC signaling component 1408 can configure a subsequent set of bytes associated with the serving cell in the MAC-CE, wherein the bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell in one or more serving cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and a second field for the indication of the new beam.

[0142] Fig.14 The number and arrangement of components shown are provided as examples. Fig.14 There may be additional components, fewer components, different components, or differently arranged components than those shown in FIG. Fig.14 Two or more of the components shown may be implemented in a single component, or Fig.14 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.14 The assembly of (one or more) components shown may perform the operations described by Fig.14 Another collection of components shown performs one or more functions.

[0143] Fig.15 1 is a block diagram of an example apparatus 1500 for wireless communication. Apparatus 1500 may be a base station, or a base station may include apparatus 1500. In certain aspects, apparatus 1500 includes a receiving component 1502 and a transmitting component 1504 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1500 may communicate with another apparatus 1506 (such as a UE, a base station, or another wireless communication device) using receiving component 1502 and transmitting component 1504. As further shown, apparatus 1500 may include a BFR component 1508, among others.

[0144] In certain aspects, the apparatus 1500 may be configured to perform the Figure 3-Figure 11 Additionally or alternatively, the apparatus 1500 may be configured to perform one or more processes described herein, such as Fig.13 The process 1300. In some aspects, Fig.15 The device 1500 and / or one or more components shown may include the above-mentioned Figure 2 Additionally or alternatively, Fig.15 One or more of the components shown may be implemented in combination with the above Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0145] The receiving component 1502 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the apparatus 1506. The receiving component 1502 may provide the received communications to one or more other components of the apparatus 1500. In some aspects, the receiving component 1502 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and may provide the processed signals to one or more other components of the apparatus 1506. In some aspects, the receiving component 1502 may include the above in combination with Figure 2 One or more antennas, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a base station are described.

[0146] The transmitting component 1504 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the apparatus 1506. In some aspects, one or more other components of the apparatus 1506 may generate communications and may provide the generated communications to the transmitting component 1504 for transmission to the apparatus 1506. In some aspects, the transmitting component 1504 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the apparatus 1506. In some aspects, the transmitting component 1504 may include the above in combination with Figure 2 One or more antennas, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described base stations. In some aspects, the transmit component 1504 can be co-located with the receive component 1502 in a transceiver.

[0147] The receiving component 1502 can receive a MAC-CE indicating beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first TRP or a second TRP of the one or more serving cells. The BFR component 1508 can perform a beam failure recovery operation based at least in part on the beam failure information.

[0148] Fig.15 The number and arrangement of components shown are provided as examples. Fig.15 There may be additional components, fewer components, different components, or differently arranged components than those shown in FIG. Fig.15 Two or more of the components shown may be implemented in a single component, or Fig.15 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.15 The assembly of (one or more) components shown may perform the operations described by Fig.15Another collection of components shown performs one or more functions.

[0149] 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 acquired from practice of the aspects.

[0150] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware, firmware, and / or hardware and software. As used herein, a processor is implemented in a combination of hardware, firmware, and / or hardware and software. It will be clear that the systems and / or methods described herein can be implemented in a combination of hardware, firmware, and / or hardware and software in different forms. The actual dedicated control hardware or software code used to implement these systems and / or methods is not a limitation of aspect. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software codes--it should be understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0151] 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.

[0152] Even if a specific combination of features is stated 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 stated in the claims and / or disclosed in the specification. Although each dependent claim listed below can directly rely on only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in the claim set. As used herein, the phrase "at least one" in the list of reference items refers to any combination of those items, including single members. As an 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 order of a, b and c).

[0153] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Likewise, as used herein, the articles "one" and "an" are intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more items quoted in conjunction with the article "the", and 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 items (e.g., related items, unrelated items, or a combination of related and unrelated items), and can be used interchangeably with "one or more". In the case of only meaning an item, the phrase "only one" or similar language is used. Likewise, as used herein, the terms "have", "have", "with", 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. Likewise, as used herein, the term "or" when used in a series is intended to be inclusive and may be used interchangeably with "and / or" unless expressly stated otherwise (e.g., if used in conjunction with "either" or "only one of...").

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: Configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells, wherein configuring the MAC-CE further comprises: configuring a first one or more bit sets, a second one or more bit sets, and a third one or more bit sets, the first one or more bit sets indicating whether a beam failure has occurred on an associated service cell among the one or more service cells, the second one or more bit sets indicating whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicating whether the single new beam or the multiple new beams are associated with the first TRP or the second TRP; and The MAC-CE is sent to a base station via at least one serving cell.

2. The method of claim 1, wherein configuring the MAC-CE further comprises: A bitmap is configured in the MAC-CE, wherein a first bit group of the bitmap indicates whether a beam failure has occurred for the first TRP on an associated service cell among the one or more service cells, and wherein a second bit group of the bitmap indicates whether a beam failure has occurred for the second TRP on an associated service cell among the one or more service cells.

3. The method of claim 2, further comprising: configuring one or more bytes associated with the one or more serving cells in the MAC-CE, The bytes in the one or more bytes associated with the TRP in the first TRP and the second TRP and the serving cell in the one or more serving cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

4. A method as claimed in claim 3, wherein the byte includes a third field indicating whether two TRPs associated with the serving cell are associated with the same beam state, and wherein if the third field indicates that two TRPs are associated with the same beam state, the MAC-CE omits another byte associated with another TRP in the first TRP and the second TRP other than the TRP associated with the byte.

5. A method as claimed in claim 3, wherein the one or more bytes are configured such that an indication of a new beam associated with the first TRP takes precedence over an indication of a new beam associated with the second TRP.

6. The method of claim 1, wherein the MAC-CE includes a bit indicating whether beam failure has occurred for a specific cell among the one or more serving cells.

7. The method of claim 6, wherein configuring the MAC-CE further comprises: The MAC-CE is configured at least in part based on the beam failure occurring for the specific cell, wherein the MAC-CE omits a field indicating whether a byte includes an indication of a new beam for the specific cell based at least in part on the beam failure occurring for the specific cell.

8. The method of claim 1, wherein the third group of bits is valid only if the second group of bits indicates that the subsequent set of bytes indicates a single new beam.

9. The method of claim 1, further comprising: configuring the subsequent set of bytes associated with the serving cell in the MAC-CE, The bytes in the subsequent byte set associated with the TRP in the first TRP and the second TRP and the serving cell include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

10. The method of claim 1, wherein configuring the MAC-CE further comprises: A byte is configured in the MAC-CE, wherein the first field of the byte indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams for a service cell among the one or more service cells, wherein the second field of the byte indicates whether the single new beam is associated with the first TRP or the second TRP of the service cell, and wherein the third field of the byte indicates a service cell identifier of the service cell.

11. The method of claim 10, wherein the second field is valid only if the first field indicates that the subsequent set of bytes indicates a single new beam.

12. The method of claim 10, further comprising: configuring the subsequent set of bytes associated with the serving cell in the MAC-CE, The bytes in the subsequent byte set associated with the TRP in the first TRP and the second TRP and the serving cell in the one or more serving cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

13. A method of wireless communication performed by a base station, comprising: receiving a medium access control element (MAC-CE) indicating beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells, wherein the MAC-CE comprises a bitmap, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated serving cell of the one or more serving cells, wherein a second bit group of the bitmap indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams, and wherein a third bit group of the bitmap indicates whether the single new beam is associated with the first TRP or the second TRP; and A beam failure recovery operation is performed based at least in part on the beam failure information.

14. A method as claimed in claim 13, wherein the MAC-CE includes a bitmap, wherein a first bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell among the one or more service cells for the first TRP, and wherein a second bit group of the bitmap indicates whether a beam failure has occurred on an associated service cell among the one or more service cells for the second TRP.

15. The method of claim 14, wherein the MAC-CE includes one or more bytes associated with the one or more serving cells, wherein bytes of the one or more bytes associated with the TRP in the first TRP and the second TRP and the serving cell in the one or more serving cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

16. A method as claimed in claim 15, wherein the byte includes a third field indicating whether two TRPs associated with the serving cell are associated with the same beam state, and wherein if the third field indicates that two TRPs are associated with the same beam state, the MAC-CE omits another byte associated with another TRP in the first TRP and the second TRP other than the TRP associated with the byte.

17. A method as claimed in claim 15, wherein the one or more bytes are configured such that an indication of a new beam associated with the first TRP takes precedence over an indication of a new beam associated with the second TRP.

18. The method of claim 13, wherein the MAC-CE includes a bit indicating whether beam failure has occurred for a specific cell among the one or more serving cells.

19. The method of claim 18, wherein the MAC-CE omits a field indicating whether bytes include an indication of a new beam for the specific cell based at least in part on a beam failure occurring for the specific cell.

20. The method of claim 13, wherein the third group of bits is valid only if the second group of bits indicates that the subsequent set of bytes indicates a single new beam.

21. The method of claim 13, wherein the MAC-CE includes the subsequent set of bytes associated with the serving cell, wherein bytes in the subsequent set of bytes associated with the TRP in the first TRP and the second TRP and the serving cell include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

22. A method as claimed in claim 13, wherein the MAC-CE includes a byte, wherein a first field of the byte indicates whether a subsequent set of bytes indicates a single new beam or multiple new beams for a service cell among the one or more service cells, wherein a second field of the byte indicates whether the single new beam is associated with the first TRP or the second TRP of the service cell, and wherein a third field of the byte indicates a service cell identifier of the service cell.

23. The method of claim 22, wherein the second field is valid only if the first field indicates that the subsequent set of bytes indicates a single new beam.

24. The method of claim 22, wherein the MAC-CE includes the subsequent set of bytes associated with the serving cell, wherein bytes in the subsequent set of bytes associated with a TRP in the first TRP and the second TRP and a serving cell in the one or more serving cells include: a first field indicating whether the byte includes an indication of a new beam for the TRP and the serving cell, and A second field for the indication of the new beam.

25. A user equipment (UE) for wireless communication, comprising: Memory; one or more processors coupled to the memory; as well as instructions stored in the memory and operable when executed by the one or more processors to cause the UE to: configuring a medium access control element (MAC-CE) to indicate beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells, wherein The one or more processors are configured to: configuring a first one or more bit sets, a second one or more bit sets, and a third one or more bit sets, the first one or more bit sets indicating whether a beam failure has occurred on an associated serving cell among the one or more serving cells, the second one or more bit sets indicating whether a subsequent bit set indicates a single new beam or multiple new beams, and the third one or more bit sets indicating whether the single new beam or the multiple new beams are associated with the first TRP or the second TRP; as well as The MAC-CE is sent to a base station via at least one serving cell.

26. A base station for wireless communication, comprising: Memory; one or more processors coupled to the memory; as well as instructions stored in the memory and operable when executed by the one or more processors to cause the base station to: receiving a medium access control control element (MAC-CE) indicating beam failure information for one or more serving cells, wherein the beam failure information is associated with at least one of a first transmit-receive point (TRP) or a second TRP of the one or more serving cells, wherein the MAC-CE includes a first one or more sets of bits, a second one or more sets of bits, and a third one or more sets of bits, the first one or more sets of bits indicating whether beam failure has occurred on an associated serving cell of the one or more serving cells, the second one or more sets of bits indicating whether a subsequent set of bits indicates a single new beam or a plurality of new beams, and the third one or more sets of bits indicating whether the single new beam or the plurality of new beams is associated with the first TRP or the second TRP; as well as A beam failure recovery operation is performed based at least in part on the beam failure information.

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