Beam failure recovery request transmission for repeated communication

Abstract

Various aspects of the present disclosure relate generally to wireless communications. In some aspects, a user equipment (UE) may: determine to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with multiple repetitions of a communication; and send the BFRQ using a specific configuration based at least in part on whether the UE has successfully decoded one or more of the multiple repetitions of the communication. Many other aspects are also provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to PCT patent application No. PCT / CN2018 / 099580, filed on August 9, 2018, entitled “BEAM FAILURE RECOVERY REQUEST TRANSMISSION FOR REPETITIOUS COMMUNICATION”, which is expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for beam failure recovery request transmission for repeated communications. Background Art

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

[0005] A wireless communication network may include several base stations (BS) that may support communications for several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As 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.

[0006] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at municipal, national, regional and even global levels. New Radio (NR) (which may also be referred to as 5G) is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR aims to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (e.g., 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 support beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. However, as the demand for mobile broadband access continues to increase, further improvements need to be made in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the invention

[0007] In some aspects, a method of wireless communications performed by a user equipment (UE) may include: determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with multiple repetitions of a communication; and sending the BFRQ using a specific configuration based at least in part on whether the UE has successfully decoded one or more of the multiple repetitions of the communication.

[0008] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: determine to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with multiple repetitions of a communication; and send the BFRQ using a specific configuration based at least in part on whether the UE has successfully decoded one or more of the multiple repetitions of the communication.

[0009] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: determine to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with multiple repetitions of a communication; and send the BFRQ using a specific configuration based at least in part on whether the UE has successfully decoded one or more of the multiple repetitions of the communication.

[0010] In some aspects, an apparatus for wireless communication may include: components for determining that a beam failure recovery request (BFRQ) is to be sent, wherein the BFRQ is associated with multiple repetitions of communication; and components for sending the BFRQ using a particular configuration based at least in part on whether the apparatus has successfully decoded one or more of the multiple repetitions of the communication.

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

[0012] The features and technical advantages of the examples according to the present disclosure have been outlined quite broadly above so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein in terms of their organization and method of operation and the associated advantages will be better understood through the following description in conjunction with the accompanying drawings. Each of the figures is provided for the purpose of illustration and description and not as a definition of limitations of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order that the above-mentioned features of the present disclosure may be understood in detail, a more specific description of the content briefly summarized above may be made with reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered as limiting the scope thereof, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0014] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

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

[0016] Figure 3 is a diagram illustrating an example of sending a BFRQ for repeated communications according to various aspects of the present disclosure.

[0017] Figure 4 is a diagram illustrating an example of sending a BFRQ for repeated communications according to various aspects of the present disclosure.

[0018] Figure 5is a diagram illustrating example processing performed, for example, by a user device, according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0019] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and also fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0020] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0021] Note that while various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0022] Figure 1 is a diagram showing a network 100 in which various aspects of the present disclosure may be practiced. The network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0023] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0024] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the access network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0025] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in FIG. 1 , a relay station 110 d may communicate with a macro BS 110 a and a UE 120 d to facilitate communication between the BS 110 a and the UE 120 d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0026] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0027] The network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0028] UE 120 (e.g., 120a, 120b, 120c) can be distributed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device or a satellite radio), a vehicle-mounted component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0029] Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. For example, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity for a network (e.g., a wide area network such as the Internet or a cellular network) or connectivity to such a network, for example, via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as user premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0030] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0031] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0032] As mentioned above, Figure 1 Provided as an example. Other examples may differ from combining Figure 1 The content described.

[0033] Figure 2 It shows that it can be Figure 1 1. Block diagram of a design 200 of base station 110 and UE 120 for one of the base stations and one of the UEs in FIG. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0034] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the (one or more) MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0035] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations, and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0036] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by MIMO detectors 236, if applicable, and further processed by receive processors 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0037] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the UE 120 may perform one or more techniques associated with beam failure recovery request (BFRQ) transmission for repeated communications, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Figure 5 The operations of process 500 and / or other processes described herein may be performed. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0038] In some aspects, the UE 120 may include: means for determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with a plurality of repetitions of a communication; means for sending the BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication; means for sending the BFRQ before an end of the plurality of repetitions of the communication based at least in part on the UE having successfully decoded one or more of the plurality of repetitions of the communication; means for sending the BFRQ or an acknowledgement at or after an end of the plurality of repetitions of the communication based at least in part on the UE having successfully decoded one or more of the plurality of repetitions of the communication; means for sending the BFRQ and a negative acknowledgement for the plurality of repetitions of the communication at or after an end of the plurality of repetitions of the communication based at least in part on the UE not having successfully decoded one or more of the plurality of repetitions of the communication; means for sending channel state information associated with the BFRQ; means for sending an acknowledgement or a negative acknowledgement based at least in part on whether the UE has successfully decoded the plurality of repetitions of the communication; means for receiving information identifying a periodicity associated with the BFRQ, wherein determining to send the BFRQ is based at least in part on determining a number of consecutive beam failures that have occurred within the periodicity; and the like. In some aspects, such components may include a combination of Figure 2 One or more components of UE 120 are described.

[0039] As mentioned above, Figure 2 Provided as an example. Other examples may differ from combining Figure 2 The content described.

[0040] The UE may communicate with the BS using beamforming, where a transmission is sent or received using a beam. The BS and / or the UE may perform beam scanning (e.g., using beam scanning techniques based on synchronization signal blocks (SSBs) and / or reference signals (RSs)) for the UE to perform beam measurements and reporting. In some cases, the UE may determine that a beam has failed (referred to herein as a beam failure). The UE may determine or declare a beam failure when all serving control channels of the UE fail based at least in part on a metric, such as an assumed downlink control channel block error rate (BLER). In some aspects, beam failure determination may be performed based on a periodicity, such as a periodicity associated with an SSB or RS. In some aspects, when the UE determines that a beam failure has occurred, the UE may provide information identifying one or more candidate beams on which to send communications.

[0041] The UE may send a beam failure recovery request (BFRQ) based at least in part on detecting one or more beam failures. For example, if the number of consecutive beam failures detected by the UE meets a threshold (e.g., a configured threshold), the UE may send the BFRQ. In some aspects, the UE may send the BFRQ using contention-free resources (such as contention-free random access resources). In some aspects, the UE may send the BFRQ with information identifying candidate beams.

[0042] The BS may send communications with multiple repetitions to enhance coverage to the UE. For example, the BS may send communications over multiple subframes with a repeated payload. The communication may use multiple (e.g., tens, hundreds, or thousands) repetitions. After the repetitions, the UE may provide an acknowledgment (ACK) or a negative ACK (NACK) (ACK / NACK) via a feedback channel (e.g., a scheduled uplink channel). In some cases, this technology may be used for IoT devices, machine type communication devices, and / or other low power or low coverage devices.

[0043] In some cases, beam failure may occur among multiple repetitions of a communication. Therefore, the UE may determine to send a BFRQ among multiple repetitions of a communication. In this case, the UE may have successfully decoded or may not have successfully decoded the communication (e.g., using soft combining or similar techniques). In addition, among multiple repetitions, the BS may not be able to determine whether the UE has successfully decoded the communication. This may be because the ACK / NACK is provided at the end of multiple repetitions. Therefore, when the BS receives a BFRQ among multiple repetitions, the BS may not be able to determine whether the UE has successfully decoded the multiple repetitions, which may result in inefficient scheduling (e.g., unnecessary repetitions, etc.).

[0044] Some techniques and apparatus described herein provide for sending a specific configuration of a BFRQ based at least in part on whether the UE has successfully decoded a communication associated with a plurality of repetitions. For example, the UE may determine resources for sending the BFRQ, whether to send the BFRQ with an ACK / NACK, whether to provide the BFRQ with a new beam indicator, whether to provide the BFRQ with channel state information (CSI), and the like. The BS may determine whether to retransmit a communication, a configuration for retransmitting the communication, and the like based at least in part on the BFRQ and / or the ACK / NACK. Thus, the BS and / or the UE may utilize network resources more efficiently, thereby improving the throughput and reliability of communications with the UE.

[0045] Figure 3 is a diagram illustrating an example 300 of sending a BFRQ for repeated communications in accordance with various aspects of the present disclosure.

[0046] like Figure 3 , and as indicated by reference numeral 310, BS 110 may send a communication having a plurality of repetitions to UE 120. In some aspects, the communication may be a data communication (e.g., a shared channel such as a physical downlink shared channel (PDSCH), a transport block, etc.). In some aspects, the communication may be a control communication (e.g., a control channel such as a physical downlink control channel (PDCCH), etc.). In some aspects, the communication may be a reference signal, a synchronization signal, a synchronization signal block, etc.

[0047] A communication may be associated with multiple repetitions. For example, a communication may be associated with a coverage enhancement scheme whereby the communication is repeated multiple times, tens, hundreds, or thousands of times. In some aspects, a repetition may occupy a subframe, a portion of a subframe, or multiple subframes.

[0048] In some aspects, UE 120 may provide information identifying one or more candidate beams to BS 110. For example, UE 120 may provide information identifying one or more candidate beams based at least in part on a beam sweeping procedure. BS 110 may configure communications with UE 120 using one of the one or more candidate beams based at least in part on BFRQ, as described in more detail below.

[0049] As indicated by reference numeral 320, UE 120 may detect one or more beam failures in a plurality of repetitions. For example, UE 120 may detect beam failures when one or more serving control channels fail based at least in part on an assumed PDCCH BLER metric. In some aspects, UE 120 may detect beam failures based at least in part on a periodicity. In some aspects, the periodicity may be associated with a reference signal (e.g., a periodic CSI-RS), a synchronization signal (e.g., a synchronization signal block), etc. In some aspects, the periodicity may be based at least in part on signaling from BS 110, such as in conjunction with Figure 4 Block 410 is described in more detail.

[0050] As indicated at reference numeral 330, UE 120 may determine to send a BFRQ. For example, UE 120 may determine that a condition for the BFRQ is met. In some aspects, UE 120 may determine that the condition is met based at least in part on a number of consecutive beam failures meeting a threshold.

[0051] As further shown, UE 120 may determine that a BFRQ will be sent using a specific configuration. In some aspects, based at least in part on whether the communication has been successfully decoded, UE 120 may determine that a BFRQ will be sent using a specific configuration, or a specific configuration may be determined. For example, UE 120 may attempt to decode a repetition that has been received before determining that a BFRQ is to be sent. Based at least in part on whether the decoding of a repetition that has been received before determining that a BFRQ is to be sent is successful, UE 120 may determine that a BFRQ will be sent using a specific configuration, or a specific configuration may be determined. As shown in reference numeral 340, UE 120 may send a BFRQ and / or an optional ACK / NACK (i.e., ACK or NACK) for the communication. Various aspects of specific configurations, BFRQs, and / or ACK / NACKs are described in turn below.

[0052] In some aspects, when UE 120 determines to send a BFRQ, UE 120 may determine to send a BFRQ. For example, when UE 120 has indicated one or more candidate beams to BS 110, UE 120 may determine to send a BFRQ before the end of the plurality of repetitions. For another example, when UE 120 has successfully decoded one or more repetitions of the plurality of repetitions (e.g., one or more repetitions that UE 120 has received before determining to send a BFRQ), UE 120 may determine to send a BFRQ before the end of the plurality of repetitions. In this case, BS 110 may terminate the plurality of repetitions and / or may schedule a new downlink beam using one or more of the one or more candidate beams, thereby saving network resources that would otherwise be used to provide the remaining repetitions.

[0053] In some aspects, UE 120 may determine that the BFRQ is to be sent at or after the end of the plurality of repetitions. For example, when UE 120 has successfully decoded a communication, UE 120 may determine that the BFRQ is to be sent at or after the end of the plurality of repetitions. In this case, UE 120 may send the BFRQ with an ACK for the communication. In some aspects, BS 110 may complete the initially scheduled repetitions (e.g., because UE 120 does not send the BFRQ before the end of the plurality of repetitions), which may save BS resources that would otherwise be used to determine that the repetitions are to be terminated early.

[0054] In some aspects, UE 120 may determine to send a BFRQ at or after the end of a plurality of repetitions based at least in part on the fact that UE 120 has not successfully decoded the communication when determining to send the BFRQ. In this case, UE 120 may wait until the plurality of repetitions are complete and may attempt to decode the plurality of repetitions after all repetitions are received. If UE 120 decodes the communication using the plurality of repetitions, UE 120 may send a BFRQ and an ACK (e.g., after decoding the plurality of repetitions). If UE 120 is unable to decode the communication using the plurality of repetitions, UE 120 may provide a BFRQ and a NACK.

[0055] In some aspects, UE 120 may provide channel state information to BS 110. For example, when decoding is unsuccessful, UE 120 may provide channel state information. In some aspects, the channel state information may identify a signal-to-noise ratio (SNR) during multiple repetitions, such as a combined SNR or an average SNR. In some aspects, the channel state information may identify a reference signal received power (RSRP) during multiple repetitions, such as a combined RSRP or an average RSRP. In some aspects, the channel state information may identify a number of subframes or repetitions (e.g., an exact number of subframes or repetitions, an approximate number of subframes or repetitions, etc.) using a measurement that satisfies a threshold.

[0056] In some aspects, the UE 120 may determine that a BFRQ is to be sent using specific resources, such as specific random access channel (RACH) resources, specific preamble sequences, etc. For example, when the UE 120 has successfully decoded a communication, the UE 120 may send the BFRQ using specific RACH resources indicating that the UE 120 has successfully decoded the BFRQ. In this way, the UE 120 may save resources that would otherwise be used to indicate an ACK / NACK for the communication.

[0057] In some aspects, the UE 120 may provide an indication of the channel state information to the BS 110. For example, the UE 120 may provide the BFRQ using specific resources associated with specific channel state information (e.g., specific RACH resources, specific preamble sequences, etc.). In some aspects, the specific resources may indicate a number of subframes received before the BFRQ transmission condition is met (e.g., an approximate number of subframes, an exact number of subframes, etc.), a measurement before triggering the BFRQ transmission (e.g., SNR, RSRP, etc.), or other channel state information. In some aspects, the UE 120 may provide the indication of the channel state information based at least in part on a successful decoding of a repetition before triggering the BFRQ transmission.

[0058] In some aspects, UE 120 may provide an indication of channel state information based at least in part on an unsuccessful decoding of a repetition prior to triggering a BFRQ transmission. In this case, BS 110 may schedule additional repetitions of the communication, wherein the number of repetitions is based at least in part on the channel state information.

[0059] In some aspects, the UE 120 may determine whether to send a BFRQ after the end of the multiple repetitions. For example, assume that the multiple repetitions include R repetitions, and assume that the current number of repetitions is r. In that case, when r≥R (e.g., when the end of the multiple repetitions has been reached), the UE 120 may determine whether to send a BFRQ. If a BFRQ is to be sent, the UE 120 may send the BFRQ. In some aspects, the UE 120 may provide an ACK / NACK based at least in part on the results of decoding the multiple repetitions. In some aspects, when r<R, the UE 120 may not send the BFRQ even if the conditions for sending the BFRQ are met. In some cases, the above relationship may take r>R and r≤R.

[0060] As indicated at reference numeral 350, BS 110 may configure one or more beams based at least in part on the BFRQ. For example, when BS 110 has received information identifying one or more candidate beams for UE 120, BS 110 may configure the one or more beams using the information identifying the one or more candidate beams, as described in greater detail elsewhere herein.

[0061] As shown in reference numeral 360, if an ACK is not received, BS 110 may schedule additional repetitions of the communication. For example, in some cases, UE 120 may provide an explicit or implicit indication that decoding of multiple repetitions was unsuccessful. In this case, BS 110 may schedule additional repetitions of the communication. In some aspects, BS 110 may not schedule additional repetitions of the communication (e.g., when BS 110 receives an explicit or implicit ACK for the communication). In some aspects, BS 110 may stop sending repetitions of the communication (e.g., when BS 110 receives an explicit or implicit ACK before the end of the repetition of the communication). In this way, UE 120 and BS 110 can more efficiently utilize network resources and provide configuration of BFRQ for repeated communications.

[0062] As mentioned above, Figure 3 Provided as an example. Other examples may differ from combining Figure 3 The content described.

[0063] Figure 4 is a diagram illustrating an example 400 of sending a BFRQ for repeated communications in accordance with various aspects of the present disclosure.

[0064] like Figure 4 As shown in and as indicated by reference numeral 410, BS 110 may send information identifying the periodicity of the BFRQ indication to UE 120. For example, in some cases, BS 110 may configure the periodicity of the BFRQ indication of UE 120. In some aspects, BS 110 may send the information identifying the periodicity of the BFRQ indication using downlink control information (DCI), medium access control element (MAC-CE), radio resource control (RRC) signaling, etc.

[0065] The BFRQ indication periodicity may identify the periodicity for which UE 120 is to perform beam failure detection, such as the number of subframes for which UE 120 is to perform beam failure detection. In some aspects, the information identifying the BFRQ indication periodicity may explicitly identify the periodicity, for example, by indicating the exact number of subframes in a single cycle. In some aspects, the information identifying the BFRQ indication periodicity may implicitly identify the periodicity, for example, by configuring one or more bits to indicate the number of subframes in a single cycle (e.g., an approximate number of subframes, an exact number of subframes, etc.).

[0066] As shown at reference numeral 420, BS 110 may send a communication having multiple repetitions to UE 120, such as in conjunction with Figure 3 Block 310 is described in more detail.

[0067] As shown at reference numeral 430, UE 120 may detect one or more beam failures using the BFRQ indication periodicity. For example, UE 120 may perform beam failure detection using the BFRQ indication periodicity configured by BS 110. As shown at reference numeral 440, UE 120 may determine to send a BFRQ using a particular configuration based at least in part on whether the communication has been successfully decoded, and as shown at reference numeral 450, UE 120 may send the BFRQ. For example, UE 120 may determine that a condition for the BFRQ is met for one or more periods of the BFRQ indication periodicity. In some aspects, UE 120 may determine to send the BFRQ when the condition for the BFRQ is met (e.g., regardless of whether the communication is completed). In some aspects, UE 120 may send an ACK / NACK for the communication (e.g., when multiple repetitions are completed).

[0068] As shown at reference numeral 450, UE 120 may send a BFRQ. For example, when UE 120 determines to send a BFRQ, UE 120 may send the BFRQ. As shown at reference numeral 460, BS 110 may configure one or more beams based at least in part on the BFRQ. As shown at reference numeral 470, if an ACK for the communication is not received, BS 110 may schedule additional repetitions. For example, in some cases, UE 120 may provide an explicit or implicit indication that decoding of multiple repetitions was unsuccessful. In this case, BS 110 may schedule additional repetitions of the communication. In some aspects, BS 110 may not schedule additional repetitions of the communication (e.g., when BS 110 receives an explicit or implicit ACK for the communication). In some aspects, BS 110 may stop sending repetitions of the communication (e.g., when BS 110 receives an explicit or implicit ACK before the end of the repetitions of the communication). In this manner, UE 120 and BS 110 more efficiently utilize network resources and provide configuration of BFRQ indication periodicity for repeated communications.

[0069] As mentioned above, Figure 4 Provided as an example. Other examples may differ from combining Figure 4 The content described.

[0070] Figure 5 5 is a diagram illustrating an example process 500 performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 500 is an example of a UE (eg, UE 120) performing transmission of a BFRQ for repeated communications.

[0071] like Figure 5As shown, in some aspects, process 500 may include: determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with multiple repetitions of a communication (block 510). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may determine to send the BFRQ. In some aspects, the UE may determine to send the BFRQ based at least in part on satisfying a condition for the BFRQ. The BFRQ may be associated with multiple repetitions of a communication. For example, in some cases, the UE may determine to send the BFRQ among the multiple repetitions.

[0072] like Figure 5 As shown, in some aspects, process 500 may include: sending a BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication (block 520). For example, the UE (e.g., using controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, etc.) may send a BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication. In conjunction with Figure 3 and Figure 4 This is described in more detail.

[0073] Process 500 may include other aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0074] In a first aspect, determining before the end of multiple repetitions of communication. In a second aspect, alone or in combination with the first aspect, a specific configuration is based at least in part on whether a new beam for multiple repetitions of communication is to be indicated. In a third aspect, alone or in combination with the first aspect and / or the second aspect, the UE may send a BFRQ before the end of multiple repetitions of communication based at least in part on the UE having successfully decoded one or more of the multiple repetitions of communication. In a fourth aspect, alone or in combination with any one or more of the first to third aspects, a specific configuration uses resources indicating that the UE has successfully decoded one or more of the multiple repetitions of communication.

[0075] In a fifth aspect, either alone or in combination with any one or more of aspects 1 to 4, the UE may send a BFRQ and confirmation at or after the end of multiple repetitions of a communication based at least in part on the UE having successfully decoded one or more of the multiple repetitions of the communication.

[0076] In a sixth aspect, alone or in combination with any one or more aspects of the first to fifth aspects, the UE may send a BFRQ and a negative acknowledgement for the multiple repetitions of the communication at or after the end of the multiple repetitions of the communication based at least in part on the UE not having successfully decoded one or more of the multiple repetitions of the communication. In a seventh aspect, alone or in combination with one or more aspects of the first to sixth aspects, the UE may send channel state information in association with the BFRQ.

[0077] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the channel state information relates to at least one of a combined measurement during multiple repetitions of the communication or a number of received subframes having a measurement that satisfies a threshold. In a ninth aspect, alone or in combination with any one or more of the first to eighth aspects, the determination is performed after the end of the multiple repetitions of the communication.

[0078] In the tenth aspect, alone or in combination with any one or more of the first to ninth aspects, the UE may send an acknowledgment or a negative acknowledgment based at least in part on whether the UE successfully decodes multiple repetitions of the communication. In the eleventh aspect, alone or in combination with any one or more of the first to tenth aspects, the UE may receive information identifying a periodicity associated with the BFRQ, wherein the determination to send the BFRQ is based at least in part on the determination of the number of consecutive beam failures that have occurred within the periodicity. In the twelfth aspect, alone or in combination with any one or more of the first to eleventh aspects, the information identifying the periodicity explicitly identifies the length of the periodicity. In the thirteenth aspect, alone or in combination with any one or more of the first to twelfth aspects, the information identifying the periodicity includes at least one bit indicating the length of the periodicity. In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the information identifying the periodicity is received via one of downlink control information, a media access control element, or a radio resource control signaling. In the fifteenth aspect, alone or in combination with any one or more of the first to fourteenth aspects, a specific configuration uses resources indicating channel state information.

[0079] although Figure 5 Example blocks of process 500 are shown, but in some aspects, process 500 may include Figure 5 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in process 500. Additionally or alternatively, two or more blocks of process 500 can be executed in parallel.

[0080] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired by practicing the various aspects.

[0081] As used herein, the term component is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, or a combination of hardware and software.

[0082] Some aspects are described herein in conjunction with a threshold value. As used herein, satisfying a threshold value may refer to a value being greater than a threshold value, greater than or equal to a threshold value, less than a threshold value, less than or equal to a threshold value, equal to a threshold value, not equal to a threshold value, etc.

[0083] It will be apparent that the systems and / or methods described herein may be implemented in various forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Therefore, the operation and behavior of these systems and / or methods are described herein without reference to specific software code—it should be understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0084] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of possible aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of possible aspects includes each dependent claim combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other ordering of a, b and c).

[0085] None of the elements, actions or instructions used herein should be interpreted as critical or essential unless explicitly described as such. Moreover, as used herein, the articles "one" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, a combination of related items and non-related items, etc.), and can be used interchangeably with "one or more". In the case where only one item is intended, the term "only one" or similar language is adopted. Moreover, as used herein, the terms "having" and the like are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A method of wireless communication performed by a user equipment UE, comprising: Determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with a plurality of repetitions of data communication via a physical downlink shared channel (PDSCH); and sending the BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication, Wherein, when the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication, the specific configuration uses resources indicating that the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication.

2. The method according to claim 1, wherein: The determination is prior to an end of the plurality of repetitions of the communication.

3. The method according to claim 1, wherein: The particular configuration is based at least in part on whether new beams for the plurality of repetitions of the communication are to be indicated.

4. The method according to claim 1, wherein: Sending the BFRQ using the specific configuration further includes: The BFRQ is sent prior to an end of the plurality of repetitions of the communication based at least in part on the UE having successfully decoded the one or more of the plurality of repetitions of the communication.

5. The method according to claim 1, wherein: Sending the BFRQ using the specific configuration further includes: The BFRQ and acknowledgement are sent at or after an end of the plurality of repetitions of the communication based at least in part on the UE having successfully decoded the one or more of the plurality of repetitions of the communication.

6. The method according to claim 1, further comprising: Based at least in part on the UE not having successfully decoded the one or more of the multiple repetitions of the communication, sending the BFRQ and a negative acknowledgement for the multiple repetitions of the communication at or after an end of the multiple repetitions of the communication.

7. The method according to claim 1, further comprising: Channel state information is sent in association with the BFRQ.

8. The method according to claim 7, wherein: The channel state information relates to at least one of a combined measurement during the plurality of repetitions of the communication or a number of received subframes having a measurement satisfying a threshold.

9. The method according to claim 1, wherein: The specific configuration uses resources indicating channel state information.

10. The method according to claim 1, wherein: The determining is performed after completion of the plurality of repetitions of the communicating.

11. The method according to claim 10, further comprising: An acknowledgement or a negative acknowledgement is sent based at least in part on whether the UE successfully decodes the plurality of repetitions of the communication.

12. The method according to claim 1, further comprising: receiving information identifying a periodicity associated with the BFRQ, Wherein determining to send the BFRQ is based at least in part on determining a number of consecutive beam failures that have occurred within the periodicity.

13. The method according to claim 12, wherein: The information identifying the periodicity explicitly identifies the length of the periodicity.

14. The method according to claim 12, wherein: The information identifying the periodicity includes at least one bit indicating a length of the periodicity.

15. The method according to claim 12, wherein: The information identifying the periodicity is received via one of downlink control information, a medium access control element, or radio resource control signaling.

16. A user equipment UE for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors configured to: Determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with a plurality of repetitions of data communication via a physical downlink shared channel (PDSCH); and sending the BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication, Wherein, when the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication, the specific configuration uses resources indicating that the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication.

17. A non-transitory computer readable medium storing one or more instructions for wireless communication, the one or more instructions, when executed by one or more processors of a user equipment (UE), causing the one or more processors to: Determine to send a beam failure recovery request BFRQ, where: The BFRQ is associated with a plurality of repetitions of data communication via a physical downlink shared channel PDSCH; and sending the BFRQ using a particular configuration based at least in part on whether the UE has successfully decoded one or more of the plurality of repetitions of the communication, Wherein, when the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication, the specific configuration uses resources indicating that the UE has successfully decoded the one or more repetitions of the multiple repetitions of the communication.

18. An apparatus for wireless communication, comprising: means for determining to send a beam failure recovery request (BFRQ), wherein the BFRQ is associated with a plurality of repetitions of data communication via a physical downlink shared channel (PDSCH); and means for transmitting the BFRQ using a particular configuration based at least in part on whether the apparatus has successfully decoded one or more of the plurality of repetitions of the communication, Wherein when the apparatus has successfully decoded the one or more of the plurality of repetitions of the communication, the particular configuration uses resources indicating that the apparatus has successfully decoded the one or more of the plurality of repetitions of the communication.

19. The device according to claim 18, wherein: The determination is prior to an end of the plurality of repetitions of the communication.

20. The device according to claim 18, wherein The particular configuration is based at least in part on whether new beams for the plurality of repetitions of the communication are to be indicated.

21. The device according to claim 18, wherein The means for sending the BFRQ using the specific configuration further comprises: Means for sending the BFRQ prior to an end of the plurality of repetitions of the communication based at least in part on the apparatus having successfully decoded the one or more of the plurality of repetitions of the communication.

22. The device according to claim 18, wherein The means for sending the BFRQ using the specific configuration further comprises: Means for sending the BFRQ and acknowledgement at or after an end of the plurality of repetitions of the communication based at least in part on the apparatus having successfully decoded the one or more of the plurality of repetitions of the communication.

23. The apparatus of claim 18, further comprising: Means for sending the BFRQ and a negative acknowledgement for the plurality of repetitions of the communication at or after an end of the plurality of repetitions of the communication based at least in part on the apparatus not having successfully decoded the one or more of the plurality of repetitions of the communication.

24. The apparatus of claim 18, further comprising: Means for transmitting channel state information in association with the BFRQ.

25. The device according to claim 24, wherein: The channel state information relates to at least one of a combined measurement during the plurality of repetitions of the communication or a number of received subframes having a measurement satisfying a threshold.

26. The device according to claim 18, wherein The specific configuration uses resources indicating channel state information.

27. The device according to claim 18, wherein The determining is performed after completion of the plurality of repetitions of the communicating.

28. The apparatus according to claim 27, further comprising: Means for sending an acknowledgment or a negative acknowledgment based at least in part on whether the apparatus successfully decoded the plurality of repetitions of the communication.

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