Techniques for Reducing Redundant Beam Failure Recovery Media Access Signaling

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment may determine that a first beam failure recovery (BFR) has been triggered, determine BFR information associated with the BFR, determine whether at least a portion of the BFR information has not been transmitted since a second BFR was triggered, and transmit a BFR message including the BFR information based at least in part on the determination that the BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the second BFR was triggered. Numerous other aspects are provided.

Description

Technical Field

[0001] Aspects of the present disclosure generally relate to wireless communication and, in particular, to techniques and apparatus for reducing redundant beam failure recovery (BFR) media access signaling.

Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may utilize a multiple access technology that is capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standards published by the Third Generation Partnership Project (3GPP®).

[0003] A wireless network may include several base stations (BSs) that can support communication for several user equipments (UEs). A user equipment (UE) may communicate with a base station (BS) via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0004] The above multi-connection technology is adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at the urban, national, regional, and even global levels. New Radio (NR), also known as 5G, is a set of extensions to the LTE mobile standard published by the 3rd Generation Partnership Project (3GPP (registered trademark)). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectra, using orthogonal frequency division multiplexing with cyclic prefix (CP-OFDM) (CP-OFDM) on the downlink (DL), and using CP-OFDM and / or SC-FDM (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL) to better integrate with other open standards, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. The demand for mobile broadband access continues to grow, and further improvements in LTE, NR, and other wireless access technologies remain useful.

Summary of the Invention

Means for Solving the Problems

[0005] In some aspects, a method of wireless communication performed by a user equipment (UE) includes determining that beam failure recovery (BFR) is triggered, determining BFR information associated with the BFR, determining whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, and transmitting a BFR message including the BFR information based at least in part on the determination that the BFR is triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered.

[0006] In some aspects, the transmission of a BFR message including BFR information is further at least partially based on that the uplink shared channel resource is available for a new transmission and that the uplink shared channel resource can accommodate the BFR message and the sub-header of the BFR message.

[0007] In some aspects, the BFR message includes a truncated BFR message, at least partially based on that the uplink shared channel resource can accommodate the truncated BFR message.

[0008] In some aspects, the transmission of a BFR message including BFR information is further at least partially based on that it is determined that the BFR is triggered and not cancelled.

[0009] In some aspects, the BFR is triggered for one or more secondary cells of the UE.

[0010] In some aspects, the BFR information includes candidate beam availability indicators of one or more secondary cells indicated by a bitmap of the BFR message.

[0011] In some aspects, at least a part of the BFR information includes a secondary cell index associated with the BFR.

[0012] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0013] In some aspects, the BFR information is provided in the first octet of the media access control control element of the BFR message.

[0014] In some aspects, the method includes determining that at least a portion of the BFR information has been transmitted, based at least in part on transmitting a BFR message and based at least in part on a secondary cell index included in the BFR message.

[0015] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0016] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0017] In some aspects, a method of wireless communication performed by a UE includes determining that a BFR has been triggered and transmitting a BFR message including BFR information, based at least in part on determining that the BFR has been triggered, where the BFR information includes a secondary cell index associated with the BFR, and the transmitting step includes determining that conditions for canceling the triggered BFR are met, based at least in part on the transmitted BFR information.

[0018] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0019] In some aspects, the BFR information is provided in a first octet of a media access control control element of the BFR message.

[0020] In some aspects, the method includes canceling a triggered BFR, based at least in part on transmitting a BFR message including BFR information.

[0021] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0022] In some aspects, a method of wireless communication performed by a base station includes receiving, from a UE, a BFR message based at least in part on a BFR triggered at the UE, the receiving step including receiving a BFR message that includes BFR information based at least in part on a determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered at the UE, and performing a BFR operation based at least in part on the BFR message.

[0023] In some aspects, the transmission of a BFR message including BFR information is further based at least in part on an uplink shared channel resource being available for a new transmission and the uplink shared channel resource being able to accommodate the BFR message and a sub-header of the BFR message.

[0024] In some aspects, the BFR message includes a truncated BFR message based at least in part on the uplink shared channel resource being able to accommodate the truncated BFR message.

[0025] In some aspects, the BFR is associated with one or more secondary cells of the UE.

[0026] In some aspects, the BFR information includes a candidate beam availability indicator for one or more secondary cells indicated by a bitmap of the BFR message, and the method further includes performing a BFR procedure based at least in part on the candidate beam availability indicator.

[0027] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0028] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0029] In some aspects, the BFR information is received in the first octet of the media access control control element of the BFR message.

[0030] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0031] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0032] In some aspects, a method of wireless communication performed by a base station includes receiving a BFR message including BFR information at least partially based on a BFR triggered at a UE, where the BFR information includes a secondary cell index associated with the BFR, and the received condition for canceling the triggered BFR is satisfied at least partially based on the transmitted BFR information; and performing a BFR operation at least partially based on the BFR message.

[0033] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0034] In some aspects, the BFR information is in the first octet of the media access control control element of the BFR message.

[0035] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0036] In some aspects, a UE for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to determine that a BFR has been triggered, determine BFR information associated with the BFR, determine whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, and transmit a BFR message including the BFR information based at least in part on the determination that the BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered.

[0037] In some aspects, the transmission of the BFR message including the BFR information is further based at least in part on that uplink shared channel resources are available for a new transmission and that the uplink shared channel resources are capable of accommodating the BFR message and subheaders of the BFR message.

[0038] In some aspects, the BFR message includes a truncated BFR message based at least in part on that the uplink shared channel resources are capable of accommodating the truncated BFR message.

[0039] In some aspects, the transmission of the BFR message including the BFR information is further based at least in part on determining that the BFR has been triggered and not canceled.

[0040] In some aspects, the BFR is triggered for one or more secondary cells of the UE.

[0041] In some aspects, the BFR information includes candidate beam availability indicators of one or more secondary cells indicated by a bitmap of the BFR message.

[0042] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0043] In some embodiments, the secondary cell index is included in the bitmap of the BFR message.

[0044] In some embodiments, the BFR information is provided in the first octet of the media access control control element of the BFR message.

[0045] In some embodiments, one or more processors are further configured to determine that at least a portion of the BFR information has been transmitted, at least in part based on the secondary cell index included in the BFR message and at least in part based on transmitting the BFR message.

[0046] In some embodiments, the BFR information is defined as a secondary cell index associated with the BFR.

[0047] In some embodiments, the secondary cell index is included in the bitmap of the BFR message.

[0048] In some embodiments, a UE for wireless communication includes a memory and one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to determine that a BFR has been triggered and to transmit a BFR message including BFR information, at least in part based on determining that the BFR has been triggered, the BFR information including a secondary cell index associated with the BFR, and to transmit, at least in part based on the transmitted BFR information, such that conditions for canceling the triggered BFR are met.

[0049] In some embodiments, the secondary cell index is included in the bitmap of the BFR message.

[0050] In some aspects, the BFR information is provided in the first octet of the media access control control element of the BFR message.

[0051] In some aspects, one or more processors are further configured to cancel a triggered BFR, at least in part based on the transmission of a BFR message that includes the BFR information.

[0052] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0053] In some aspects, a base station for wireless communication includes a memory and one or more processors operably coupled to the memory, the memory and the one or more processors being configured to receive, from a UE, a BFR message, at least in part based on a BFR triggered at the UE, the BFR message including BFR information, at least in part based on a determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered at the UE, and to perform a BFR operation, at least in part based on the BFR message.

[0054] In some aspects, the transmission of a BFR message that includes BFR information is further based, at least in part, on the uplink shared channel resource being available for a new transmission and the uplink shared channel resource being able to accommodate the BFR message and the subheader of the BFR message.

[0055] In some aspects, the BFR message includes a truncated BFR message, at least in part based on the uplink shared channel resource being able to accommodate the truncated BFR message.

[0056] In some aspects, the BFR is associated with one or more secondary cells of the UE.

[0057] In some aspects, the BFR information includes candidate beam availability indicators for one or more secondary cells indicated by a bitmap of the BFR message, and one or more processors are further configured to execute a BFR procedure based at least in part on the candidate beam availability indicators.

[0058] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0059] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0060] In some aspects, the BFR information is received in a first octet of a media access control control element of the BFR message.

[0061] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0062] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0063] In some aspects, a base station for wireless communication includes a memory and one or more processors operably coupled to the memory, the memory and the one or more processors being configured to receive a BFR message including BFR information based at least in part on a BFR triggered at a UE, the BFR information including a secondary cell index associated with the BFR, to receive, if conditions for canceling the triggered BFR are satisfied based at least in part on the transmitted BFR information, and to perform a BFR operation based at least in part on the BFR message.

[0064] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0065] In some aspects, the BFR information is in the first octet of the media access control control element of the BFR message.

[0066] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0067] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication, when executed by one or more processors of a UE, causes the one or more processors to determine that a BFR has been triggered, determine BFR information associated with the BFR, determine whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, and transmit a BFR message including the BFR information, at least in part based on the determination that the BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered.

[0068] In some aspects, the transmission of the BFR message including the BFR information is further based at least in part on that uplink shared channel resources are available for a new transmission and that the uplink shared channel resources can accommodate the BFR message and the sub-header of the BFR message.

[0069] In some aspects, the BFR message includes a truncated BFR message, at least in part based on that the uplink shared channel resources can accommodate the truncated BFR message.

[0070] In some aspects, the transmission of the BFR message including the BFR information is further based at least in part on determining that the BFR has been triggered and not cancelled.

[0071] In some aspects, the BFR is triggered for one or more secondary cells of the UE.

[0072] In some aspects, the BFR information includes candidate beam availability indicators for one or more secondary cells indicated by a bitmap of the BFR message.

[0073] In some aspects, at least a part of the BFR information includes a secondary cell index associated with the BFR.

[0074] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0075] In some aspects, the BFR information is provided in the first octet of a media access control control element of the BFR message.

[0076] In some aspects, when one or more instructions are executed by one or more processors, the one or more processors are further caused to determine that at least a part of the BFR information is transmitted, based at least in part on transmitting the BFR message and based at least in part on the secondary cell index included in the BFR message.

[0077] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0078] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0079] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication, when executed by one or more processors of a UE, causes the one or more processors to determine that a BFR has been triggered and to transmit a BFR message including BFR information at least partially based on determining that the BFR has been triggered, where the BFR information includes a secondary cell index associated with the BFR, and to perform the transmitting such that conditions for canceling the triggered BFR are satisfied at least partially based on the transmitted BFR information. The non-transitory computer-readable medium includes one or more instructions for causing the one or more processors to perform the above actions.

[0080] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0081] In some aspects, the BFR information is provided in a first octet of a media access control control element of the BFR message.

[0082] In some aspects, when executed by one or more processors, the one or more instructions further cause the one or more processors to cancel the triggered BFR at least partially based on transmission of the BFR message including the BFR information.

[0083] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0084] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication, when executed by one or more processors of a base station, causes the one or more processors to receive a BFR message from a UE at least partially based on a BFR triggered at the UE, the BFR message including BFR information at least partially based on a determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered at the UE, and to perform a BFR operation at least partially based on the BFR message.

[0085] In some aspects, transmission of a BFR message including BFR information is further at least partially based on an uplink shared channel resource being available for a new transmission and the uplink shared channel resource being able to accommodate the BFR message and a sub-header of the BFR message.

[0086] In some aspects, the BFR message includes a truncated BFR message at least partially based on the uplink shared channel resource being able to accommodate the truncated BFR message.

[0087] In some aspects, the BFR is associated with one or more secondary cells of the UE.

[0088] In some aspects, the BFR information includes candidate beam availability indicators for one or more secondary cells indicated by a bitmap of the BFR message, and the one or more instructions, when executed by one or more processors, cause the one or more processors to perform a BFR procedure at least partially based on the candidate beam availability indicators.

[0089] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0090] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0091] In some aspects, the BFR information is received in the first octet of the media access control control element of the BFR message.

[0092] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0093] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0094] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication, when executed by one or more processors of a base station, causes the one or more processors to receive a BFR message including BFR information, at least partially based on a BFR triggered at a UE, where the BFR information includes a secondary cell index associated with the BFR, and to receive, at least partially based on the transmitted BFR information, a condition for canceling the triggered BFR is satisfied, and to perform a BFR operation, at least partially based on the BFR message, including one or more instructions.

[0095] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0096] In some aspects, the BFR information is in the first octet of the media access control control element of the BFR message.

[0097] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0098] In some aspects, an apparatus for wireless communication includes means for determining that a BFR has been triggered, means for determining BFR information associated with the BFR, means for determining whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, and means for transmitting a BFR message including the BFR information based at least in part on the determination that the BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered.

[0099] In some aspects, the transmission of a BFR message including the BFR information is further based at least in part on that uplink shared channel resources are available for a new transmission and that the uplink shared channel resources are capable of accommodating the BFR message and a sub-header of the BFR message.

[0100] In some aspects, the BFR message includes a truncated BFR message based at least in part on that the uplink shared channel resources are capable of accommodating the truncated BFR message.

[0101] In some aspects, the transmission of a BFR message including the BFR information is further based at least in part on determining that the BFR has been triggered and not cancelled.

[0102] In some aspects, the BFR is triggered for one or more secondary cells of the apparatus.

[0103] In some aspects, the BFR information includes candidate beam availability indicators for one or more secondary cells indicated by a bitmap of the BFR message.

[0104] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0105] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0106] In some aspects, the BFR information is provided in the first octet of the media access control control element of the BFR message.

[0107] In some aspects, the apparatus includes means for determining that at least a portion of the BFR information has been transmitted, based at least in part on the secondary cell index included in the BFR message and at least in part on transmitting the BFR message.

[0108] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0109] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0110] In some aspects, an apparatus for wireless communication includes means for determining that a BFR has been triggered and means for transmitting a BFR message including the BFR information, based at least in part on determining that the BFR has been triggered, wherein the BFR information includes a secondary cell index associated with the BFR, and means for transmitting, based at least in part on the transmitted BFR information, when conditions for canceling the triggered BFR are met.

[0111] In some aspects, the secondary cell index is included in the bitmap of the BFR message.

[0112] In some aspects, the BFR information is provided in the first octet of the media access control control element of the BFR message.

[0113] In some aspects, the apparatus includes means for canceling a triggered BFR, at least in part based on the transmission of a BFR message including BFR information.

[0114] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0115] In some aspects, an apparatus for wireless communication includes means for receiving a BFR message from a UE, at least in part based on a BFR triggered at the UE, where the BFR message includes BFR information, at least in part based on a determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered at the UE, and means for performing a BFR operation, at least in part based on the BFR message.

[0116] In some aspects, the transmission of a BFR message including BFR information is further based at least in part on the uplink shared channel resource being available for a new transmission and the uplink shared channel resource being able to accommodate the BFR message and a sub-header of the BFR message.

[0117] In some aspects, the BFR message includes a truncated BFR message, at least in part based on the uplink shared channel resource being able to accommodate the truncated BFR message.

[0118] In some aspects, the BFR is associated with one or more secondary cells of the UE.

[0119] In some aspects, the BFR information includes a candidate beam availability indicator for one or more secondary cells indicated by a bitmap of the BFR message, and the apparatus further includes means for performing a BFR procedure, at least in part based on the candidate beam availability indicator.

[0120] In some aspects, at least a portion of the BFR information includes a secondary cell index associated with the BFR.

[0121] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0122] In some aspects, the BFR information is received in a first octet of a media access control control element of the BFR message.

[0123] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0124] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0125] In some aspects, an apparatus for wireless communication is means for receiving a BFR message including BFR information, at least partially based on a BFR triggered at the UE, where the BFR information includes a secondary cell index associated with the BFR, and means for receiving, where a condition for canceling the triggered BFR is satisfied at least partially based on the transmitted BFR information, and means for performing a BFR operation at least partially based on the BFR message.

[0126] In some aspects, the secondary cell index is included in a bitmap of the BFR message.

[0127] In some aspects, the BFR information is in a first octet of a media access control control element of the BFR message.

[0128] In some aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0129] Aspects are generally described herein with reference to the drawings and include a method, an apparatus, a system, a computer program product, a non-transitory computer-readable medium, a user equipment, a base station, a wireless communication device, and / or a processing system as shown by the accompanying drawings and the present specification.

[0130] The above provides a fairly broad overview of the features and technical advantages of examples according to the present disclosure so that the following "Detailed Description of the Invention" can be better understood. Additional features and advantages are described below. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for accomplishing the same purposes of the present disclosure. Such equivalent structures do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both their composition and the manner of operation, will be better understood from the following description, along with the associated advantages, when considered in connection with the accompanying drawings. Each of the figures is provided for purposes of illustration and explanation, not as a definition of the limitations of the claims.

[0131] To better understand the above-described features of the present disclosure, a more detailed description, briefly summarized above, may be obtained by referring to aspects shown in the accompanying drawings. However, it should be noted that since this description may admit other equally effective aspects, the accompanying drawings show only some exemplary aspects of the present disclosure and should not be regarded as limiting its scope. The same reference numbers in different drawings may identify the same or similar elements.

Brief Description of the Drawings

[0132]

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DETAILED DESCRIPTION OF THE INVENTION

[0133] Various aspects of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should understand that the scope of the present disclosure, whether implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure, encompasses any aspect of the present disclosure disclosed herein. For example, any number of the aspects described herein may be used to implement an apparatus or practice a method. In addition, the scope of the present disclosure encompasses apparatuses or methods practiced using other structures, functionality, or structures and functionality in addition to, or other than, the various aspects of the disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of the claims.

[0134] Next, some aspects of a telecommunications system are presented with reference to various apparatuses and techniques. These apparatuses and techniques are described in the following detailed description and are 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 as software depends on the particular application and the design constraints imposed on the overall system.

[0135] In some cases, aspects will be described herein using terms commonly associated with 5G or New Radio (NR) radio access technology (RAT), but it should be noted that aspects of the present disclosure may be applicable to other RATs such as 3G RAT, 4G RAT, and / or RATs following 5G (e.g., 6G).

[0136] FIG. 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 an element of, or include, a 5G (NR) network, an LTE network, and the like. The wireless network 100 may include several base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d), and other network entities. A base station (BS) is an entity that communicates with 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 in a specific geographical area. In 3GPP (registered trademark), the term "cell" can refer to the coverage area of a BS, and / or the BS subsystem serving this coverage area, depending on the context in which the term is used.

[0137] The BS may realize communication coverage for macro cells, pico cells, femto cells, and / or another type of cell. A macro cell may cover a relatively large geographical area (e.g., with a radius of several kilometers) and may enable unrestricted access by UEs subscribed to the service. A pico cell may cover a relatively small geographical area and may enable unrestricted access by UEs subscribed to the service. A femto cell may cover a relatively small geographical area (e.g., a home) and may enable restricted access by UEs associated with the femto cell (e.g., UEs within a Closed Subscriber Group (CSG)). The BS for a macro cell may be referred to as a macro BS. The BS for a pico cell may be referred to as a pico BS. The BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in FIG. 1, BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. The 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.

[0138] In some aspects, the cell may not necessarily be stationary and the geographical area of the cell may move according to the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or 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, virtual networks, using any suitable transport network.

[0139] Wireless network 100 may also include relay stations. A relay station is an entity that can receive the transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of that 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. In the example shown in FIG. 1, relay BS 110d can communicate with BS 110a and UE 120d to facilitate communication between macro BS 110a and UE 120d. Relay BS may sometimes be referred to as a relay station, relay base station, relay, etc.

[0140] Wireless network 100 may be a heterogeneous network including different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmission power levels, different coverage areas, and different impacts on interference in wireless network 100. For example, a macro BS may have a high transmission power level (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have a lower transmission power level (e.g., 0.1 to 2 watts).

[0141] Network controller 130 may be coupled to a set of BSs and may perform coordination and control for these BSs. Network controller 130 can communicate with the BSs via a backhaul. The BSs can also communicate with each other directly or indirectly, for example, via a wireless or wireline backhaul.

[0142] UE 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be fixed or mobile. The UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, etc. The UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or instrument, a biosensor / device, a wearable device (smartwatch, smart clothing, smart glasses, smart list band, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0143] Some UEs may be regarded as machine-type communication (MTC) UEs, or evolved or enhanced machine-type communication (eMTC) UEs. MTC UEs and eMTC UEs can communicate with, for example, a base station, another device (such as a remote device), or some other entities, including robots, drones, remote devices, sensors, meters, monitors, location tags, etc. A wireless node can provide connectivity for a network (such as a wide area network like the Internet or a cellular network) or connectivity to the network via, for example, a wired or wireless communication link. Some UEs may be regarded as Internet of Things (IoT) devices and / or may be implemented as narrowband Internet of Things (NB-IoT) devices. Some UEs may be regarded as customer premise equipment (CPE). UE120 may be included inside a housing that houses components of UE120, such as a processor component, a memory component, etc. In some aspects, the processor component and the memory component may be coupled to each other. For example, the processor component (such as one or more processors) and the memory component (such as a memory) may be operably coupled, communicatively coupled, electronically coupled, and electrically coupled.

[0144] Generally, any number of wireless networks can be deployed within a given geographical area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. The RAT may also be referred to as a wireless technology, an air interface, etc. The frequency may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT within a given geographical area to avoid interference between wireless networks of different RATs. In some cases, an NR RAT network or a 5G RAT network may be deployed.

[0145] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as a medium to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (which may include, for example, vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, and the like. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere in this specification as being performed by base station 110.

[0146] Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which can be divided into various classes, bands, channels, etc. based on frequency or wavelength. For example, devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1) that can span from 410 MHz to 7.125 GHz, and / or using an operating band having a second frequency range (FR2) that can span from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 may sometimes be referred to as intermediate band frequencies. A portion of FR1 is higher than 6 GHz, but FR1 is often referred to as the "sub-6 GHz" band. Similarly, although FR2 is different from the extremely high frequency (EHF) band (30 GHz to 300 GHz) identified as the "millimeter wave" band by the International Telecommunication Union (ITU), it is often referred to as the "millimeter wave" band. Thus, unless otherwise specified, terms such as "sub-6 GHz" should be understood to broadly represent frequencies below 6 GHz, frequencies within FR1, and / or intermediate band frequencies (e.g., greater than 7.125 GHz) when used in this specification. Similarly, unless otherwise specified, terms such as "millimeter wave" should be understood to broadly represent frequencies within the EHF band, frequencies within FR2, and / or intermediate band frequencies (e.g., less than 24.25 GHz) when used in this specification. It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described in this specification are applicable to those modified frequency ranges.

[0147] As shown above, FIG. 1 is provided as an example. Other examples may be different from those described with respect to FIG. 1.

[0148] FIG. 2 is a diagram showing an example 200 of a base station 110 communicating with a UE 120 in a wireless network 100 according to various aspects of the present disclosure. The base station 110 may be equipped with T antennas 234a-234t, and the UE 120 may be equipped with R antennas 252a-252r, where generally T≧1 and R≧1.

[0149] At base station 110, transmission processor 220 may receive data for one or more UEs from data source 212, may select one or more modulation and coding schemes (MCSs) for each UE based at least in part on channel quality indicators (CQIs) received from the UEs, may process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and may provide data symbols to all UEs. Transmission processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and may provide overhead symbols and control symbols. Transmission processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signal (CRS), demodulation reference signal (DMRS), etc.) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). Transmission (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, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a - 232t. Each modulator 232 may process its respective output symbol stream (e.g., for OFDM etc.) to obtain an output sample stream. Each modulator 232 may further process the output sample stream (e.g., convert to analog, amplify, filter, and up-convert) to obtain a downlink signal. The T downlink signals from modulators 232a - 232t may each be transmitted via one of the T antennas 234a - 234t.

[0150] In UE120, antennas 252a - 252r may receive downlink signals from base station 110 and / or other base stations, and may respectively provide the received signals to demodulators (DEMOD) 254a - 254r. Each demodulator 254 may adjust (e.g., filter, amplify, down - convert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 may obtain received symbols from all R demodulators 254a - 254r, perform MIMO detection on the received symbols when applicable, and provide the detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE120 to the data sink 260, and provide the 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 the reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE120 may be included in the housing 284.

[0151] 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 the core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0152] On the uplink, at the UE 120, the transmission processor 264 may receive data from the data source 262 and control information from the controller / processor 280 (for example, for reports including RSRP, RSSI, RSRQ, CQI, etc.) and process them. The transmission processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmission processor 264 may be precoded by the TX MIMO processor 266, if applicable, and further processed by the modulators 254a - 254r (for example, for DFT - s - OFDM, CP - OFDM, etc.) and transmitted to the base station 110. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of the antenna 252, the modulator and / or demodulator 254, the MIMO detector 256, the reception processor 258, the transmission processor 264, and / or the TX MIMO processor 266. The transceiver may be used by a processor (for example, the controller / processor 280) and the memory 282 to implement any aspect of the methods described herein.

[0153] At base station 110, uplink signals from UE 120 and other UEs are received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 for scheduling UE 120 for downlink and / or uplink communication. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to implement any aspect of the methods described herein.

[0154] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component of FIG. 2 may implement one or more techniques associated with reducing redundant beam failure recovery (BFR) media access signaling, as described in more detail elsewhere in this specification. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or any other component of FIG. 2 may perform or direct the operations of, for example, process 700 of FIG. 7, process 800 of FIG. 8, process 900 of FIG. 9, process 1000 of FIG. 10, and / or other processes described herein. Memories 242 and 282 may store data and program code for the base station 110 and the UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120 (e.g., immediately or after compiling, converting, interpreting, etc.), the one or more instructions may cause the one or more processors, the UE 120, and / or the base station 110 to perform or direct the operations of, for example, process 700 of FIG. 7, process 800 of FIG. 8, process 900 of FIG. 9, process 1000 of FIG. 10, and / or other processes as described herein. In some aspects, executing the instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, etc.

[0155] In some aspects, the UE 120 includes means for determining that a BFR has been triggered, means for determining BFR information associated with the BFR, means for determining whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, and means for transmitting a BFR message including the BFR information based at least in part on the determination that a BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered. The means for transmitting is based at least in part on the determination that a BFR has been triggered, and the BFR information includes a secondary cell index associated with the BFR. The means for transmitting may include means for canceling the triggered BFR when a condition for canceling the triggered BFR is satisfied based at least in part on the transmitted BFR information. In some aspects, such means may include one or more components of the UE 120 described in connection with FIG. 2, such as the controller / processor 280, transmission processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, reception processor 258, etc.

[0156] In some aspects, the base station 110 is means for receiving a BFR message from the UE, at least partially based on a BFR triggered at the UE, the BFR message including BFR information, at least partially based on a determination that at least a part of the BFR information has not been transmitted since the BFR was triggered at the UE, means for receiving, and means for performing a BFR operation, at least partially based on the BFR message; and is means for receiving a BFR message including BFR information, at least partially based on a BFR triggered at the UE, the BFR information including a secondary cell index associated with the BFR, and means for receiving, where a condition for canceling the triggered BFR is satisfied, at least partially based on the transmitted BFR information, and means for performing a BFR operation, at least partially based on the BFR message, and the like may be included. In some aspects, such means may include one or more components of the base station 110 described with respect to FIG. 2, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0157] As shown above, FIG. 2 is provided as an example. Other examples may be different from those described with respect to FIG. 2.

[0158] The UE and the base station may communicate with each other using beams. A transmitter (e.g., the UE or the base station) may generate a transmit beam by applying a spatial filter to a set of antennas, and a receiver (e.g., the UE or the base station) may generate a corresponding receive beam by applying another spatial filter to a set of antennas. In particular, in higher frequency ranges where omnidirectional or pseudo-omnidirectional transmission may be associated with exorbitant power requirements and radiation levels, the use of beams may improve the throughput and gain of the entire network. The UE and the base station may use beam selection and refinement procedures to determine a beam pair for communication between the UE and the base station.

[0159] The UE can monitor the reference signals transmitted by the base station to detect beam failures. A beam failure may refer to the situation where one or more of the UE-side beams or BS-side beams cannot provide appropriate coverage for communication between the UE and the base station. Beam failures can be caused by changes in channel conditions, obstacles, distance from the base station transmitting the beam, interference, etc. When the reference signals of the first set of beams do not meet a threshold (e.g., Qout threshold, etc.) in several monitoring opportunities, the UE can identify a beam failure. Beam Failure Detection (BFD) in the UE may require the execution of Beam Failure Recovery (BFR) procedures when the wireless communication device continues to communicate using beamforming. In some aspects, the BFR procedures may involve reporting that a beam failure has occurred and / or reporting candidate beams that the UE can switch to in order to continue beamforming-based communication.

[0160] In some aspects, the UE can communicate using Carrier Aggregation (CA). The deployment of CA may include one or more Primary Cells (PCells) and one or more Secondary Cells (SCs). The PCell can operate on a primary frequency (e.g., the first frequency). The UE can execute initial connection establishment procedures and / or connection re-establishment procedures on the PCell. The SCell can operate on a secondary frequency (e.g., a second frequency different from the first frequency). The SCell can be configured via the PCell. The SCell can provide additional radio resources for communication with the UE. The PCell and SCell of the UE can be collectively referred to as the serving cells of the UE. In some aspects, the PCell or Scell can be referred to as a Component Carrier (CC). In some aspects, the communication on the PCell or SCell can be configured via a Bandwidth Part (BWP).

[0161] In some aspects, beam failure may occur on a secondary cell (SCell) of a user equipment (UE). For example, the UE may monitor the configured reference signal (RS) quality of the SCell in a beam failure detection (BFD) procedure. If the UE detects a beam failure, it may declare the beam failure and thus send a beam failure recovery request (which may also be referred to as a BFR message, such as a scheduling request (SR)) including a BFR medium access control (MAC) control element (CE) to the base station. The BFR MAC CE can be transmitted on any available uplink shared channel (UL-SCH) resource if the UL-SCH resource can accommodate the BFR MAC CE. The UE may trigger an SR for each triggered SCell BFR. The BFR MAC CE may include an index associated with the failed SCell (referred to herein as the SCell index) and optionally information indicating candidate beams for the BFR procedure.

[0162] In some aspects, all BF Rs triggered before the MAC protocol data unit (PDU) assembly for beam failure recovery of an SCell can be cancelled when the MAC PDU is transmitted and the MAC PDU includes a BFR MAC CE or a truncated BFR MAC CE containing beam failure information of that SCell. In other words, when the beam failure information of an SCell is transmitted, all BF Rs triggered before the MAC PDU assembly of the MAC PDU providing the beam failure information can be cancelled. However, in some aspects, the UE may be instructed to perform logical channel prioritization (LCP) when an uplink grant is received if the BFR MAC CE has been transmitted. In some aspects, the beam failure information may be defined as one or more octets including a candidate beam availability indicator of the SCell indicated by the BFR MAC CE.

[0163] For example, for antenna tuning time and candidate beam determination, it may take a certain amount of time for the UE to identify candidate beams of the BFR. While determining the candidate beams, the UE can continue to transmit the BFR MAC CE in the uplink grant by the LCP command. Since the transmitted BFR MAC CE does not contain beam failure information, the BFR may not be canceled, and the transmission of the BFR MAC CE may continue until the candidate beams are determined and signaled to the BS, which consumes significant resources and increases the overhead of the UE and the BS associated with repeatedly signaling the MAC CE.

[0164] Some of the techniques and apparatuses described herein provide a method for reducing redundant transmission of the BFR MAC CE such that the UE can skip the transmission of one or more BFR MAC CEs. In some aspects, the UE may transmit the BFR MAC CE based at least in part on whether the BFR information to be included in the BFR MAC CE has already been transmitted (e.g., reported) since the most recently triggered BFR. In some aspects, the BFR information that triggers the cancellation of the BFR may be defined as the SCell index associated with the SCell on which the BFR was triggered. Thus, the condition for triggering the cancellation of the BFR may be satisfied by the first BFR MAC CE associated with the BFR, thereby eliminating the need to transmit subsequent BFR MAC CEs. In this way, the resource consumption and overhead associated with BFR signaling are reduced.

[0165] Figure 3 is a diagram showing an example 300 of repeated transmission of BFR MAC CE. The repeated transmission in example 300 can be performed at least partially based on an instruction to execute LCP when an uplink grant is received when a BFR MAC CE is transmitted, according to various aspects of the present disclosure. As shown in the figure, example 300 includes UE120 and BS110. Actions performed by UE120 are indicated by upward arrows (such as the arrow indicated by reference number 305), and actions performed by BS110 are indicated by downward arrows (such as the arrow indicated by reference number 315). UE120 and BS110 in example 300 can be associated with a beamformed communication link with at least one SCell.

[0166] As indicated by reference number 305, UE120 may determine that a BFR on the SCell of UE120 is triggered. For example, UE120 may determine that a BFR is triggered at least partially based on the BFD procedure. More specifically, UE120 may determine that one or more measurements on the SCell did not meet a threshold, that the block error rate on the SCell did not meet a threshold, etc.

[0167] UE120 may transmit one or more BFR MAC CEs 310 at least partially based on the BFR triggered on the SCell. The BFR MAC CE may indicate the SCell associated with the BFR (at least partially based on, for example, the SCell index of the SCell). In some aspects, the BFR MAC CE may indicate a candidate beam index corresponding to a beam selected by UE120, such as the best beam (determined by UE120) of the BFR. For details of the content of the BFR MAC CE, refer to Figure 6.

[0168] As shown, UE120 may transmit BFR MAC CE 310 with an uplink grant 315. For example, UE120 may be instructed to perform LCP for the BFR MAC CE, and thus UE120 may transmit BFR MAC CE 310 with each available uplink grant 315. As further shown, BFR MAC CE 310 does not include BFR information. In some aspects, BFR information refers to information indicating the best beam. In other aspects, as described with respect to FIG. 5, BFR information refers to the SCell index at which the BFR is triggered. By defining BFR information to include the SCell index, the conditions for canceling the triggered BFR may be met, thereby reducing the number of BFR MAC CE 310 to be transmitted by UE120.

[0169] As indicated by reference numeral 320, it may take UE120 some time to identify a candidate beam for the BFR. After determining the candidate beam, UE120 may transmit (e.g., report) a BFR MAC CE 325 that includes BFR information identifying the candidate beam. Thus, as indicated by reference numeral 330, UE120 may cancel the triggered BFR. For example, UE120 may cancel all BFRs triggered prior to MAC PDU assembly of BFR MAC CE 325, at least partially based on a BFR MAC CE that includes beam obstruction information (also referred to as BFR information) for the SCell associated with the BFR or a truncated BFR MAC CE included in BFR MAC CE 325.

[0170] If the UE 120 transmits one or more BFR MAC CE 310s before determining the candidate beam, the UE 120 may use a significant amount of signaling resources for redundant transmission. Some of the techniques and apparatuses described herein provide ways to reduce the redundant transmission of the BFR MAC CE 310s such that the UE 120 can skip the transmission of one or more BFR MAC CE 310s (thus, the BFR MAC CE 310s are shown using dashed lines). For example, in some aspects, as indicated by reference numeral 335, the UE 120 may transmit the BFR MAC CE 310 / 325 based at least in part on whether the BFR information to be included in the BFR MAC CE 310 / 325 has already been transmitted (e.g., reported) since the most recently triggered BFR 305. Such aspects will be described in more detail in connection with FIG. 4. In some aspects, as indicated by reference numeral 340, the BFR information that triggers the cancellation of a BFR may be defined as the SCell index associated with the SCell in which the BFR was triggered. Thus, the condition for triggering the cancellation of a BFR may be satisfied by the first BFR MAC CE 310, thereby obviating the need to transmit subsequent BFR MAC CE 310s and 325s.

[0171] As shown above, FIG. 3 is provided as an example. Other examples may be different from those described with respect to FIG. 3.

[0172] FIG. 4 is a diagram illustrating an example 400 of BFR signaling based at least in part on conditions related to unreported BFR information, according to various aspects of the present disclosure. As shown, example 400 includes a UE 120 and a BS 110. Similar to FIG. 3, actions performed by the UE 120 are indicated by upward arrows and actions performed by the BS 110 are indicated by downward arrows. In some aspects, at least one of the operations described as being performed by the UE 120 may be performed by the MAC entity of the UE 120.

[0173] In Example 400, as indicated by reference numeral 405, the UE 120 may transmit a BFR MAC CE if the BFR information to be included in the BFR MAC CE has not been transmitted (e.g., reported) since the most recently triggered BFR. For example, as indicated by reference numeral 410, the UE 120 may, at least in part, based on the UL-SCH resource (e.g., uplink grant) being available for transmission and the UL-SCH resource being capable of accommodating a BFR MAC CE having BFR information, after selecting a candidate beam, transmit a BFR MAC CE having BFR information. Accordingly, the UE 120 may cancel the triggered BFR, at least in part, based on the transmission of the BFR MAC CE including the BFR information. If the BFR information has already been transmitted or there is no BFR information to be included in the BFR MAC CE, the UE 120 may not need to transmit the BFR MAC CE, for example, as indicated by reference numeral 415. Accordingly, the UE 120 may reduce the overhead and resource utilization associated with BFR reporting as compared to reporting MAC CE indiscriminately without BFR information.

[0174] In some aspects, the UE 120 may transmit a first BFR MAC CE and then may transmit a second BFR MAC CE after selecting a candidate beam. For example, the BFR MAC CE may include an indicator of no beam, such as a null beam value. The second BFR MAC CE may include a beam index corresponding to the candidate beam selected by the UE 120.

[0175] In some aspects, the conditions for transmitting the BFR MAC CE may be defined by an algorithm, such as Algorithm 1 below. Algorithm 1 1> If the beam failure recovery procedure determines that at least one BFR has been triggered and not cancelled: 2>The UL-SCH resource is available for a new transmission, and if the UL-SCH resource can accommodate the sub-header of BFR MAC CE + BFR MAC CE as a result of LCP, and 2>If the UE has new beam failure recovery information that has not been reported since the last BFR was triggered: 3>Instruct the multiplexing and assembly procedures to generate a BFR MAC CE. 2>Otherwise, if the UL-SCH resource is available for a new transmission and the UL-SCH resource can accommodate the sub-header of truncated BFR MAC CE + truncated BFR MAC CE as a result of LCP, and 2>If the UE has new beam failure recovery information that has not been reported since the last BFR was triggered: 3>Instruct the multiplexing and assembly procedures to generate a truncated BFR MAC CE. 2>Otherwise: 3>For each SCell where a BFR was triggered and not cancelled, trigger an SR for SCell beam failure recovery.

[0176] As shown above, FIG. 4 is provided as an example. Other examples may differ from those described with respect to FIG. 4.

[0177] FIG. 5 is a diagram illustrating an example 500 of BFR signaling based at least in part on BFR information including SCell indexes, according to various aspects of the present disclosure. As shown, example 500 includes UE120 and BS110. Similar to FIGS. 3 and 4, actions performed by UE120 are indicated by upward arrows and actions performed by BS110 are indicated by downward arrows. In some aspects, at least one of the operations described as being performed by UE120 may be performed by a MAC entity of UE120.

[0178] In Example 500, as indicated by reference number 505, "BFR information" (which may also be referred to as "beam obstruction information") may include the SCell index. For example, the "BFR information" may be defined as the value of a bit field indicating the SCell associated with the BFR (e.g., C in Example 600 of FIG. 6 i )). Thus, the BFR MAC CE 510 indicating the SCell index associated with the BFR may meet the conditions for canceling the BFR, as indicated by reference number 515. Thus, the UE 120 may save signaling resources that would otherwise be used to repeatedly transmit the MAC CE with the SCell index and without the candidate beam availability indicator for the SCell. In some aspects (not shown in FIG. 5), the UE 120 may signal to the BS 110 information indicating candidate beams for the SCell, such as using the MAC CE in an uplink grant.

[0179] In some aspects, the operations described with respect to FIGS. 4 and 5 can be combined. For example, if the BFR information to be transmitted in the BFR MAC CE has not yet been transmitted, the UE 120 transmits the BFR MAC CE, and the BFR information may include the SCell index or a field indicating the SCell index.

[0180] As shown above, FIG. 5 is provided as an example. Other examples may be different from those described with respect to FIG. 5.

[0181] FIG. 6 is a diagram showing an exemplary structure 600 of a BFR MAC CE according to various aspects of the present disclosure. As shown, the structure 600 includes a bitmap 605, a set of candidate beam availability indication (AC) fields 610, and a set of candidate reference signal (RS) ID fields 615 corresponding to the set of AC fields 610. The C of the bitmap 605 set to a first value (e.g., 1) iThe field may indicate beam obstacle detection and the presence of an octet including the AC field 610 of an SCell having a serving cell index (e.g., ServCellIndex) i. C set to a second value (e.g., 0) i The field indicates that no beam obstacle is detected and that the octet including the AC field 610 does not exist for the SCell having ServCellIndex i. The octets including the AC field 610 may exist in ascending order based on the ServCellIndex. In some aspects, the BFR information of the BFR MAC CE may include or be defined as Ci, as described in more detail in connection with FIG. 5.

[0182] The AC field 610 may indicate the presence of a candidate reference signal (RS) ID field 615 within the octet. If at least one synchronization signal block (SSB) having a synchronization signal reference signal received power (SS-RSRP) that satisfies rsrp-ThresholdBFR among the SSBs in the candidateBeamRSSCellList, or at least one channel state information reference signal (CSI-RS) having a channel state information RSRP (CSI-RSRP) that satisfies rsrp-ThresholdBFR among the CSI-RSs in the candidateBeamRSSCellList is available, the AC field 610 may be set to a first value. Otherwise, the AC field 610 may be set to a second value. When the AC field 610 is set to the first value, the candidate RS ID field 615 exists. When the AC field 610 is set to the second value, one or more reserved bits exist. In some aspects, as described in connection with FIG. 4, the BFR information of the BFR MAC CE may include or be defined as the AC field 610 and / or the candidate RS ID field 615.

[0183] As shown above, FIG. 6 is provided as an example. Other examples may be different from those described in connection with FIG. 6.

[0184] FIG. 7 is a diagram illustrating an exemplary process 700, such as may be performed by a UE, according to various aspects of the present disclosure. Exemplary process 700 is an example of operations associated with techniques for a UE (e.g., UE 120, etc.) to mitigate redundant beam failure recovery media access signaling. In some aspects, one or more of the operations described with respect to example 700 may be performed by one or more of the components of FIG. 11, such as transmission component 1104, reception component 1102, BFD / BFR component 1108, determination component 1110, etc.

[0185] As shown in FIG. 7, in some aspects, process 700 may include determining that a BFR has been triggered (block 710). For example, a UE (using, e.g., antenna 252, DEMOD 254, MIMO detector 256, reception processor 258, controller / processor 280, etc.) may determine that a BFR has been triggered as described above. In some aspects, the operation indicated by block 710 may be performed by reception component 1102 or BFD / BFR component 1108.

[0186] As further shown in FIG. 7, in some aspects, process 700 may include determining BFR information associated with the BFR (block 720). For example, a UE (using, e.g., antenna 252, DEMOD 254, MIMO detector 256, reception processor 258, controller / processor 280, etc.) may determine BFR information associated with the BFR as described above. In some aspects, the operation indicated by block 720 may be performed by reception component 1102 or BFD / BFR component 1108. In some aspects, the UE may determine the BFR information after transmitting one or more BFR messages.

[0187] As further shown in FIG. 7, in some aspects, process 700 may include determining whether at least a portion of the BFR information has not been transmitted since the BFR was triggered (block 730). For example, a UE (using, e.g., antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may determine whether at least a portion of the BFR information has not been transmitted since the BFR was triggered, as described above. In some aspects, the operation indicated by block 730 may be performed by transmission component 1104, BFD / BFR component 1108, or determination component 1110.

[0188] As further shown in FIG. 7, in some aspects, process 700 may include transmitting a BFR message including the BFR information, based at least in part on the determination that the BFR was triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered (block 740). For example, a UE (using, e.g., controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit a BFR message including the BFR information, based at least in part on the determination that the BFR was triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered, as described above. In some aspects, the operation indicated by block 740 may be performed by transmission component 1102 or BFD / BFR component 1108.

[0189] Process 700 may include additional aspects, such as any single aspect or any combination of aspects, described with respect to one or more other processes described below and / or elsewhere in this specification.

[0190] In a first aspect, the transmission of a BFR message including BFR information is further at least partially based on that the uplink shared channel resource is available for a new transmission and that the uplink shared channel resource can accommodate the BFR message and the sub-header of the BFR message.

[0191] In a second aspect, alone or in combination with the first aspect, the BFR message includes a truncated BFR message, at least partially based on that the uplink shared channel resource can accommodate the truncated BFR message.

[0192] In a third aspect, alone or in combination with one or more of the first and second aspects, the transmission of a BFR message including BFR information is further at least partially based on determining that the BFR is triggered and not cancelled.

[0193] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the BFR is triggered for one or more secondary cells of the UE.

[0194] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the BFR information includes one or more secondary cell candidate beam availability indicators indicated by a bitmap of the BFR message.

[0195] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, at least a part of the BFR information includes a secondary cell index associated with the BFR.

[0196] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the secondary cell index is included in a bitmap of the BFR message.

[0197] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, BFR information is provided in the first octet of the media access control control element of the BFR message.

[0198] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, process 700 includes determining that at least a portion of the BFR information has been transmitted, based at least in part on transmitting a BFR message and based at least in part on a secondary cell index included in the BFR message. In some aspects, the operations of the ninth aspect may be performed by BFD / BFR component 1108 or determination component 1110.

[0199] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, BFR information is defined as a secondary cell index associated with the BFR.

[0200] In an eleventh additional aspect, alone or in combination with one or more of the first through tenth aspects, the secondary cell index is included in a bitmap of the BFR message.

[0201] FIG. 7 shows an exemplary block of process 700, but in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently compared to the blocks shown in FIG. 7. Alternatively or additionally, two or more of the blocks of process 700 may be executed in parallel.

[0202] FIG. 8 is a diagram illustrating an exemplary process 800, such as may be performed by a UE, according to various aspects of the present disclosure. The exemplary process 800 is an example of operations associated with techniques for a UE (such as, for example, UE 120) to reduce redundant beam failure recovery media access signaling. In some aspects, one or more of the operations described with respect to 800 may be performed by one or more of the components of FIG. 11, such as transmit component 1104, receive component 1102, BFD / BFR component 1108, determination component 1110, and the like.

[0203] As shown in FIG. 8, in some aspects, process 800 may include determining that a BFR has been triggered (block 810). For example, a UE (using, for example, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may determine that a beam failure recovery (BFR) has been triggered, as described above. In some aspects, the operation indicated by block 810 may be performed by receive component 1102 or BFD / BFR component 1108.

[0204] As further shown in FIG. 8, in some aspects, process 800 may include transmitting a BFR message that includes BFR information, at least partially based on determining that BFR has been triggered, where the BFR information includes a secondary cell index associated with the BFR, and may include transmitting such that conditions for canceling the triggered BFR are satisfied, at least partially based on the transmitted BFR information. For example, a UE (e.g., using controller / processor 280, transmission processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may transmit a BFR message that includes BFR information, at least partially based on determining that BFR has been triggered, as described above. In some aspects, the BFR information includes a secondary cell index associated with the BFR. In some aspects, the conditions for canceling the triggered BFR are satisfied, at least partially based on the transmitted BFR information. In some aspects, the operations shown by block 820 may be performed by transmission component 1104 or BFD / BFR component 1108.

[0205] Process 800 may include additional aspects, such as any single aspect or any combination of aspects, described with respect to one or more other processes described below and / or elsewhere in this specification.

[0206] In a first aspect, the secondary cell index is included in a bitmap of the BFR message.

[0207] In a second aspect, alone or in combination with the first aspect, the BFR information is provided in a first octet of a media access control control element of the BFR message.

[0208] In a third aspect, alone or in combination with one or more of the first and second aspects, process 800 includes canceling a triggered BFR based at least in part on the transmission of a BFR message that includes BFR information. In some aspects, the operations of the third aspect may be performed by transmission component 1104 or BFD / BFR component 1108.

[0209] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0210] FIG. 8 shows exemplary blocks of process 800, but in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently compared to the blocks shown in FIG. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be executed in parallel.

[0211] FIG. 9 is a diagram showing an exemplary process 900 implemented, for example, by a base station according to various aspects of the present disclosure. The exemplary process 900 is an example of operations associated with techniques for a base station (e.g., base station 110, etc.) to reduce redundant beam failure recovery media access signaling. In some aspects, one or more of the operations described with respect to example 900 may be performed by one or more of the components of FIG. 12, such as transmission component 1204, reception component 1202, BFR component 1208.

[0212] As shown in FIG. 9, in some aspects, process 900 may include receiving, at a base station, a BFR message from a UE, at least partially based on a BFR triggered at the UE, where the BFR message includes BFR information, at least partially based on a determination that at least some of the BFR information has not been transmitted since the BFR was triggered at the UE (block 910). For example, a base station (using, e.g., antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may receive a BFR message from the UE, at least partially based on a BFR triggered at the UE as described above. In some aspects, the BFR message includes BFR information, at least partially based on a determination that at least some of the BFR information has not been transmitted since the BFR was triggered at the UE. In some aspects, the operation of block 910 may be performed by receive component 1202 or BFR component 1208.

[0213] As further shown in FIG. 9, in some aspects, process 900 may include performing a BFR operation, at least partially based on the BFR message (block 920). For example, a base station (using, e.g., controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may perform a BFR operation, at least partially based on the BFR message as described above. In some aspects, the operation of block 920 may be performed by transmit component 1204 or BFR component 1208.

[0214] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described with respect to one or more other processes described below and / or elsewhere in this specification.

[0215] In a first aspect, the transmission of a BFR message including BFR information is further at least partially based on that the uplink shared channel resource is available for a new transmission and that the uplink shared channel resource can accommodate the BFR message and the sub-header of the BFR message.

[0216] In a second aspect, alone or in combination with the first aspect, the BFR message includes a truncated BFR message, at least partially based on that the uplink shared channel resource can accommodate the truncated BFR message.

[0217] In a third aspect, alone or in combination with one or more of the first and second aspects, the BFR is associated with one or more secondary cells of the UE.

[0218] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 900 includes performing a BFR procedure, at least partially based on a candidate beam availability indicator. In some aspects, the operation of the fourth aspect can be performed by BFR component 1208.

[0219] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, at least a part of the BFR information includes a secondary cell index associated with the BFR.

[0220] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the secondary cell index is included in a bitmap of the BFR message.

[0221] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the BFR information is received in the first octet of the media access control control element of the BFR message.

[0222] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0223] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the secondary cell index is included in a bitmap of the BFR message.

[0224] FIG. 9 shows exemplary blocks of process 900, but in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently compared to the blocks shown in FIG. 9. Additionally or alternatively, two or more of the blocks of process 900 may be executed in parallel.

[0225] FIG. 10 is a diagram showing an exemplary process 1000 implemented, for example, by a base station according to various aspects of the present disclosure. The exemplary process 1000 is an example of operations associated with techniques for a base station (e.g., base station 110, etc.) to reduce redundant beam failure recovery medium access signaling. In some aspects, one or more of the operations described with respect to example 1000 may be executed by one or more of the components of FIG. 12, such as transmission component 1204, reception component 1202, BFR component 1208, etc.

[0226] As shown in FIG. 10, in some aspects, process 1000 may include receiving a BFR message including BFR information, at least partially based on a BFR triggered at the UE, where the BFR information includes a secondary cell index associated with the BFR, and may include receiving that a condition for canceling the triggered BFR is satisfied, at least partially based on the transmitted BFR information (block 1010). For example, a base station (using, e.g., antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, etc.) may receive a BFR message including BFR information, at least partially based on a BFR triggered at the UE, as described above. In some aspects, the BFR information includes a secondary cell index associated with the BFR. In some aspects, the condition for canceling the triggered BFR is satisfied, at least partially based on the transmitted BFR information. In some aspects, the operation of block 1010 may be performed by receive component 1202 or BFR component 1208.

[0227] As further shown in FIG. 10, in some aspects, process 1000 may include performing BFR operations, at least partially based on the BFR message (block 1020). For example, a base station (using, e.g., controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may perform BFR operations, at least partially based on the BFR message, as described above. In some aspects, the operation of block 1010 may be performed by transmit component 1204, receive component 1202, or BFR component 1208.

[0228] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects, described with respect to one or more other processes described below and / or elsewhere in this specification.

[0229] In a first aspect, the secondary cell index is included in the bitmap of the BFR message.

[0230] In a second aspect, alone or in combination with the first aspect, the BFR information is in the first octet of the media access control control element of the BFR message.

[0231] In a third aspect, alone or in combination with one or more of the first and second aspects, the BFR information is defined as a secondary cell index associated with the BFR.

[0232] FIG. 10 shows an exemplary block of process 1000, but in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or blocks arranged differently compared to the blocks shown in FIG. 10. Additionally or alternatively, two or more of the blocks of process 1000 may be executed in parallel.

[0233] FIG. 11 is a block diagram of an exemplary apparatus 1100 for wireless communication. Apparatus 1100 can be a UE or the UE can include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102 and a transmitting component 1104 that can communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1100 can communicate with another apparatus 1106 (such as a UE, a base station, or another wireless communication device) using receiving component 1102 and transmitting component 1104. Further shown, apparatus 1100 can include one or more of a BFD / BFR component 1108 or a determination component 1110, among other examples.

[0234] In some aspects, apparatus 1100 may be configured to perform one or more operations described herein with respect to FIGS. 3 - 6. Additionally or alternatively, apparatus 1100 may be configured to perform one or more processes described herein, such as process 700 of FIG. 7, process 800 of FIG. 8, or a combination thereof. In some aspects, apparatus 1100, and / or one or more components shown in FIG. 11, may include one or more components of the UE described above with respect to FIG. 2. Additionally or alternatively, one or more components shown in FIG. 11 may be implemented within one or more components described above with respect to FIG. 2. Additionally or alternatively, one or more components of a set of components may be implemented at least partially as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non - transitory computer - readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0235] Receiving component 1102 may receive communications from apparatus 1106, such as a reference signal (e.g., associated with a BFD / BFR procedure), control information, data communication, or a combination thereof. Receiving component 1102 may provide the received communications to one or more other components of apparatus 1100. In some aspects, receiving component 1102 may perform signal processing (among other examples, filtering, amplification, demodulation, analog - to - digital conversion, de - multiplexing, de - interleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and provide the processed signal to one or more other components of apparatus 1106. In some aspects, receiving component 1102 may include one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or combinations thereof of the UE described above with respect to FIG. 2.

[0236] The transmitting component 1104 may transmit communications such as a reference signal, control information (e.g., BFR MAC CE), data communication, or a combination thereof to the device 1106. In some aspects, one or more other components of the device 1106 may generate a communication and provide the generated communication to the transmitting component 1104 for transmission to the device 1106. In some aspects, the transmitting component 1104 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communication and transmit the processed signal to the device 1106. In some aspects, the transmitting component 1104 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof of the UE described above in connection with FIG. 2. In some aspects, the transmitting component 1104 may be collocated with the receiving component 1102 in a transceiver.

[0237] The BFD / BFR component 1108 may determine that the BFR has been triggered, for example, at least in part based on a BFD procedure. The BFD / BFR component 1108 may determine BFR information associated with the BFR. The determining component 1110 may determine whether at least a portion of the BFR information has not been transmitted since the BFR was triggered. The BFD / BFR component 1108 or the transmitting component 1104 may transmit a BFR message including the BFR information based at least in part on the determination that the BFR has been triggered and the determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered.

[0238] In some aspects, the BFD / BFR component 1108 may determine that a beam BFR has been triggered. The transmission component 1104 or the BFD / BFR component 1108 may transmit a BFR message including BFR information, at least partially based on determining that the BFR has been triggered, where the BFR information includes a secondary cell index associated with the BFR, and conditions for canceling the triggered BFR are satisfied, at least partially based on the transmitted BFR information.

[0239] The number and arrangement of the components shown in FIG. 11 are given as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components compared to the components shown in FIG. 11. Further, two or more of the components shown in FIG. 11 may be implemented within a single component, or a single component shown in FIG. 11 may be implemented as a plurality of distributed components. Additionally or alternatively, a set of (one or more) components shown in FIG. 11 may perform one or more functions described as being performed by another set of components shown in FIG. 11.

[0240] FIG. 12 is a block diagram of an exemplary apparatus 1200 for wireless communication. The apparatus 1200 may be a base station or the base station may include the apparatus 1200. In some aspects, the apparatus 1200 may include a receiving component 1202 and a transmitting component 1204 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, the apparatus 1200 may communicate with another apparatus 1206 (such as a UE, a base station, or another wireless communication device) using the receiving component 1202 and the transmitting component 1204. Further shown, the apparatus 1200 may include a BFR component 1208.

[0241] In some aspects, apparatus 1200 may be configured to perform one or more operations described herein with respect to FIGS. 3-6. Additionally or alternatively, apparatus 1200 may be configured to perform one or more processes described herein, such as process 900 of FIG. 9, process 1000 of FIG. 10, or a combination thereof. In some aspects, apparatus 1200, and / or one or more components shown in FIG. 12 may include one or more components of the base station described above with respect to FIG. 2. Additionally or alternatively, one or more components shown in FIG. 12 may be implemented within one or more components described above with respect to FIG. 2. Additionally or alternatively, one or more components of a set of components may be implemented at least partially as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

[0242] Receiving component 1202 may receive communications, such as a reference signal, control information, data communication, or a combination thereof, from apparatus 1206. Receiving component 1202 may provide the received communications to one or more other components of apparatus 1200. In some aspects, receiving component 1202 may perform signal processing (among other examples, filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, etc.) on the received communications and provide the processed signals to one or more other components of apparatus 1206. In some aspects, receiving component 1202 may include one or more antennas, demodulators, MIMO detectors, receiving processors, controllers / processors, memories, or a combination thereof of the base station described above with respect to FIG. 2.

[0243] The transmitting component 1204 may transmit communications such as a reference signal, control information, data communication, or a combination thereof to the device 1206. In some aspects, one or more other components of the device 1206 may generate a communication and provide the generated communication to the transmitting component 1204 for transmission to the device 1206. In some aspects, the transmitting component 1204 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communication and transmit the processed signal to the device 1206. In some aspects, the transmitting component 1204 may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller / processor, a memory, or a combination thereof of the base station described in connection with FIG. 2. In some aspects, the transmitting component 1204 may be co-located with the receiving component 1202 in a transceiver.

[0244] In some aspects, the receiving component 1202 or the BFR component 1208 may receive a BFR message from the UE based at least in part on a BFR triggered at the UE, and the BFR message includes BFR information based at least in part on a determination that at least a portion of the BFR information has not been transmitted since the BFR was triggered at the UE. The BFR component 1208 may perform a BFR operation based at least in part on the BFR message.

[0245] In some aspects, the receiving component 1202 or the BFR component 1208 may receive a BFR message including BFR information based at least in part on a BFR triggered at the UE, the BFR information includes a secondary cell index associated with the BFR, and a condition for canceling the triggered BFR is satisfied based at least in part on the transmitted BFR information. The BFR component 1208 may perform a BFR operation based at least in part on the BFR message.

[0246] The number and arrangement of the components shown in FIG. 12 are given by way of example. In practice, there may be additional components, fewer components, different components, or differently arranged components compared to those shown in FIG. 12. Further, two or more components shown in FIG. 12 may be implemented within a single component, or a single component shown in FIG. 12 may be implemented as a plurality of distributed components. Additionally or alternatively, a set of (one or more) components shown in FIG. 12 may perform one or more functions described as being performed by another set of components shown in FIG. 12.

[0247] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure, or acquired from practice of the embodiments.

[0248] As used herein, the term "component" is to be broadly construed as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and / or a combination of hardware and software. It will be apparent that the systems and / or methods described herein may be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual specific control hardware or software code used to implement these systems and / or methods is not limiting of the embodiments. Accordingly, the operation and behavior of the systems and / or methods are described herein without reference to specific software code. It should be understood that software and hardware may be designed to implement the systems and / or methods based at least in part on the description herein.

[0249] As used herein, "meeting a threshold" may, depending on the context, refer to a value being greater than a threshold, being greater than or equal to a threshold, being less than a threshold, being less than or equal to a threshold, being equal to a threshold, being not equal to a threshold, and the like.

[0250] Even if a particular combination of features is recited in the claims and / or disclosed herein, these combinations do not limit the disclosure in various aspects. In fact, many of these features may be combined in ways that are not specifically recited in the claims and / or not disclosed herein. Each of the dependent claims listed below may be directly dependent on only one claim, but the disclosure in various aspects includes each dependent claim combined with any other claim in the claim set. A phrase referring to an enumeration of items "at least one of" refers to any combination of those items including a single member. By way of example, "at least one of a, b, or c" includes a, b, c, a - b, a - c, b - c, and a - b - c, as well as any combination having multiple of the same elements (e.g., a - a, a - a - a, a - a - b, a - a - c, a - b - b, a - c - c, b - b, b - b - b, b - b - c, c - c, and c - c - c, or any other order of a, b, and c).

[0251] None of the elements, acts, or instructions used in this specification should be construed as important or essential unless explicitly described. Also, as used in this specification, the articles "a" and "an" include one or more items and may be used interchangeably with "one or more." Further, the article "the" as used in this specification includes one or more items referred to with the article "the" and may be used interchangeably with "one or more." Additionally, as used in this specification, the terms "set" and "group" include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." When only one item is intended, the phrase "only one" or a similar term is used. Also, as used in this specification, terms such as "has," "have," "having," etc. shall be considered open-ended terms. Further, the phrase "based on" shall mean "at least partially based on" unless explicitly stated otherwise. Also, the term "or" as used in this specification is inclusive when used consecutively and may be used interchangeably with "and / or" unless otherwise specified (e.g., when used in combination with "either" or "only one of").

Description of Reference Numerals

[0252] 100 Wireless Network 110 Base Station 120 UE 130 Network Controller 212 Data Source 220 Transmission Processor 230 X MIMO Processor 232a~232t Modulator (MOD) 234a~234t Antenna 236 MIMO Detector 238 Receiver Processor 239 Data Sink 240 Controller / Processor 242 Memory 244 Communication Unit 246 Scheduler 252a~252r Antenna 254 Modulator and / or Demodulator 254a~254r Demodulator (DEMOD), Modulator 256 MIMO Detector 258 Receiver Processor 260 Data Sink 262 Data Source 264 Transmitter Processor 266 TX MIMO Processor 280 Controller / Processor 282 Memory 284 Housing 290 Controller / Processor 292 Memory 294 Communication Unit 300 Example 310 BFR MAC CE 315 Uplink Permission 325 BFR MAC CE 400 Example 500 Example 600 Structure, Example 605 Bitmap 610 Candidate Beam Availability Indication (AC) Field 615 Candidate Reference Signal (RS) ID Field 700 Process, Example 800 Process, Example 900 Process, Example 1000 Process, Example 1100 Device 1102 Receiver Component 1104 Transmitter Component 1106 Device 1108 BFD / BFR Component 1110 Decision Component 1200 device 1202 receiving component 1204 transmitting component 1206 device 1208 BFR component

Claims

1. A method of wireless communication performed by a user equipment (UE), comprising: determining that a beam failure recovery (BFR) procedure has been triggered; starting to determine BFR information associated with the BFR procedure; skipping transmission of a BFR message before the determination of the BFR information is completed; after the BFR information is determined, transmitting a BFR message including the BFR information; wherein the transmission of the BFR message including the BFR information is further at least partially based on that an uplink shared channel resource is available for a new transmission and that the uplink shared channel resource can accommodate the BFR message and a sub-header of the BFR message.

2. The method according to claim 1, wherein the transmission of the BFR message including the BFR information is further at least partially based on that the BFR procedure has been triggered and determined not to be cancelled.

3. The step of skipping transmission of a BFR message before the determination of the BFR information is completed further includes cancelling transmission of the BFR message at least partially based on that a secondary cell index associated with the BFR procedure is included in the BFR message.

4. The method according to claim 1, wherein the BFR message includes the truncated BFR message at least partially based on that the uplink shared channel resource can accommodate the truncated BFR message.

5. The method according to claim 1, wherein the BFR procedure is triggered for one or more secondary cells of the UE.

6. The method according to claim 1, wherein the BFR information includes candidate beam availability indicators of one or more secondary cells indicated by a bitmap of the BFR message.

7. The method according to claim 1, wherein at least a part of the BFR information includes a secondary cell index associated with the BFR procedure.

8. The method according to claim 7, wherein the secondary cell index is included in a bitmap of the BFR message.

9. The method according to claim 7, wherein the BFR information is provided in a first octet of a media access control control element (MAC-CE) of the BFR message.

10. The method according to claim 1, wherein the BFR information is defined as a secondary cell index associated with the BFR procedure.

11. The method according to claim 10, wherein the secondary cell index is included in a bitmap of the BFR message.

12. A user equipment (UE) for wireless communication, comprising: a memory; one or more processors operably coupled to the memory, wherein the memory and the one or more processors are configured to perform the method according to any one of claims 1 to 11. User equipment (UE).

13. A computer program that, when executed by a processor of a user equipment (UE) for wireless communication, causes the UE to perform the method according to any one of claims 1 to 11.

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