RU2829336C2 - Method and device for recovery of communication after beam failure and data medium - Google Patents

Abstract

FIELD: communication equipment.

SUBSTANCE: invention relates to communication. Execution by the terminal comprises the following actions: performing beam failure detection on a plurality of transmit/receive points (TRP) of the terminal, if the terminal is configured with a plurality of TRP points; and triggering recovery of communication after beam failure based on random access, when among the plurality of TRPs, a first TRP at which a beam failure occurred is detected.

EFFECT: timely execution of communication recovery after beam failure (BFR) based on random access in scenario with multiple transmission/reception points (TRP).

15 cl, 14 dwg

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0001] The present invention relates to the field of communication technologies and, in particular, to a method for restoring communication after a beam failure, a device for restoring communication after a beam failure and an information carrier.

LEVEL OF TECHNOLOGY

[0002] In New Radio (NR) technology, for example, when the radio frequency band belongs to frequency range 2, due to rapid attenuation in high-frequency channels, it is necessary to transmit and receive the signal using beams to ensure the necessary coverage.

[0003] In the related art, a network device is configured with a plurality of Transmit/Receive Points (TRPs). If the network device has a plurality of TRPs, the network device can serve a terminal using these TRPs. For example, the TRPs can be used to transmit data to the terminal over a Physical Downlink Control Channel (PDCCH). The network device uses the TRPs to transmit data to the terminal over a PDCCH, and the terminal recognizes reference signal resources used for failure detection. If the terminal detects that the radio channel level of the reference signal used for failure detection is below a threshold, the terminal must initiate a Beam Failure Recovery (BFR) request to the network device to perform the BFR operation.

[0004] In the related art, BFR operations for specific cells are defined. For example, a BFR operation for a special cell (SpCell, Special Cell) is defined. The SpCell includes a primary cell (Pcell, Primary cell) and a primary secondary cell (PScell, Primary Secondary cell). The BFR operation for the SpCell is a random access-based BFR mechanism, according to which a terminal, having detected a beam failure in the SpCell, initiates a random access process to request restoration of communication after the beam failure. In addition, a BFR operation for the secondary cell (SCell) is defined, which is a mechanism based on a scheduling request (SR) on a physical uplink control channel (PUCCH) and/or a mechanism based on a medium access control element (MAC CE) on a physical uplink shared channel (PUSCH). Thus, when the terminal detects a beam failure in the Scell, it transmits the MAC information of the CE in the PUSCH resource to report information related to the BFR operation. However, the PUSCH resource may be PUSCH channels allocated for transmitting the SR request in the PUCCH-SR resource for the BFR operation or other PUSCH resources.

[0005] In the related art, a BFR operation for a specific TRP is proposed. That is, if a terminal is configured to transmit a PDCCH for multiple TRPs, when a beam failure occurs at a specific TRP, the terminal can send a BFR request to inform the network device of the existence of the TRP at which the beam failure occurred and request the BFR operation. Currently, when performing the BFR operation for a specific TRP, it is envisaged to use the PUCCH-SR mechanism for the SCell and/or the PUSCH MAC CE mechanism for the SCell to process the BFR request. However, in the case of the SpCell, if a beam failure occurs at multiple TRPs, it is necessary to decide whether and how to trigger the BFR request based on random access.

ESSENCE OF THE INVENTION

[0006] In order to solve the problems existing in the related technical solutions, the present invention provides a beam failure recovery (BFR) method, a BFR device, and a storage medium.

[0007] According to a first aspect of the embodiments of the present invention, a beam failure recovery (BFR) method implemented by a terminal is provided. The method includes:

[0008] performing beam failure detection on a plurality of transmission/reception points (TRPs) of the terminal if the terminal is configured with a plurality of TRPs; and starting a random access based BFR operation when a first TRP at which a beam failure has occurred is detected among the plurality of TRPs.

[0009] In one embodiment, before starting the random access based BFR operation, the method further includes: determining whether a condition for starting the random access based BFR operation is met.

[0010] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0011] determining whether to fulfill a condition for starting a random access BFR operation upon detection of a second TRP among a plurality of TRPs at which a beam failure has occurred after a first time and before a second time, where the first time is a time of detecting the beam failure at the first TRP, and the second time is a time of transmitting a scheduling request (SR) on a physical uplink control channel (PUCCH) resource.

[0012] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0013] determining whether to perform a condition for starting a random access BFR operation upon detecting, among a plurality of TRPs, a second TRP at which a beam failure has occurred before a third time, where the third time is a time of receiving first downlink control information for scheduling a physical uplink shared channel (PUSCH).

[0014] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0015] determining whether a condition for starting a random access BFR operation is met in the absence of downlink control information during a first time interval after a second time instant, where the second time instant is the transmission time of a scheduling request (SR) on a physical uplink control channel (PUCCH) resource.

[0016] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0017] determining the execution of a condition for starting a random access BFR operation upon detection of a second TRP among a plurality of TRPs at which a beam failure occurred before a fourth time, where the fourth time is the time of transmitting medium access control element (MAC CE) information associated with the TRP at which the beam failure occurred on a first physical uplink shared channel (PUSCH).

[0018] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0019] determining whether a condition for starting a random access based BFR operation is met if a failure occurs in a beam corresponding to the first physical uplink shared channel (PUSCH);

[0020] wherein the first PUSCH channel is scheduled based on the first downlink control information or the first PUSCH channel is a configured PUSCH channel grant of type 1 or 2.

[0021] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0022] determining whether a condition for starting a BFR operation based on random access is met upon detection of a second TRP among a plurality of TRPs at which a beam failure has occurred before a fifth time, where the fifth time is a time of receiving the second downlink control information, where the second downlink control information is used to determine whether the network device has received the medium access control element (MAC CE) information.

[0023] In one embodiment, the second downlink control information is used to schedule a second physical uplink shared channel (PUSCH);

[0024] the identifier of the hybrid automatic repeat request of the second PUSCH channel scheduled by the second downlink control information is identical to the identifier of the hybrid automatic repeat request of the first PUSCH channel, wherein the first PUSCH channel is used to transmit MAC CE information associated with the TRP at which the beam failure occurred; and/or the new data indicator of the second PUSCH channel scheduled based on the second downlink control information is switched.

[0025] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0026] determining whether a condition for starting a random access BFR operation is met in the absence of downlink control information during a second time interval after a fourth time, where the fourth time is the time of transmitting medium access control element (MAC CE) information associated with the TRP at which the beam failure occurred on the first physical uplink shared channel (PUSCH).

[0027] In one embodiment, determining whether a condition for starting a random access BFR operation is met includes:

[0028] determining whether to fulfill a condition for starting a BFR operation based on random access upon detection of a second TRP among a plurality of TRPs at which a beam failure occurred before a sixth time point, where the sixth time point is a beam update time of the first TRP.

[0029] In one embodiment, the method further includes: starting a BFR operation for a particular TRP upon detection of another second TRP among the plurality of TRPs at which a beam failure occurred after the sixth time.

[0030] In one embodiment, initiating a BFR operation for a particular TRP includes:

[0031] starting BFR operation based on PUCCH-SR and/or PUSCH MACCE mechanisms.

[0032] In one embodiment, the method further includes: starting a BFR operation for a particular TRP or not starting a BFR operation for a particular TRP.

[0033] In one embodiment, a terminal configured with a plurality of TRPs includes: a terminal configured with a plurality of sets of reference signal resources for detecting a beam failure, and/or a terminal configured with a plurality of control resource pool index values.

[0034] According to a second aspect of the embodiments of the present invention, a device for beam failure recovery (BFR) is provided. The device includes:

[0035] a detecting module configured to perform beam failure detection on a plurality of transmission/reception points (TRPs) of a terminal if the terminal is configured with a plurality of TRPs; and a processing module configured to start a random access-based BFR operation if a first TRP at which a beam failure has occurred is detected among the plurality of TRPs.

[0036] In one embodiment, the processing module is further configured to: determine a condition for starting the random access based BFR operation before starting the random access based BFR operation.

[0037] In one embodiment, the processing module determines that a condition for starting a random access BFR operation is met if the detecting module detects among the plurality of TRPs a second TRP at which a beam failure occurred before a second time, where the second time is the time of transmission of a scheduling request (SR) in a physical uplink common access channel (PUCCH) resource.

[0038] In one embodiment, the processing module determines that a condition for starting a random access BFR operation is met if the detecting module detects among the plurality of TRPs a second TRP at which a beam failure occurred before a third time, where the third time is the time of receiving the first downlink control information for scheduling a physical uplink shared channel (PUSCH).

[0039] In one embodiment, the processing module determines whether a condition for starting a BFR operation based on random access is met in the absence of downlink control information during a first time interval after a second time point, where the second time point is the time of transmission of a scheduling request (SR) on a physical uplink control channel (PUCCH) resource.

[0040] In one embodiment, the processing module determines that the condition for starting a random access BFR operation is met if the detecting module detects among the plurality of TRPs a second TRP at which a beam failure occurred before a fourth time, where the fourth time is the time of transmitting medium access control element (MAC CE) information associated with the TRP at which the beam failure occurred on the first physical uplink shared access channel (PUSCH).

[0041] In one embodiment, the processing module determines whether a condition for starting a random access BFR operation is met if the beam in which the failure occurred corresponds to the first physical uplink shared channel (PUSCH);

[0042] wherein the first PUSCH channel is scheduled based on the first downlink control information or the first PUSCH channel is a configured PUSCH channel grant of type 1 or 2.

[0043] In one embodiment, the processing module determines that a condition for starting a BFR operation based on random access is met if the detecting module detects among the plurality of TRPs a second TRP at which a beam failure occurred before a fifth time, where the fifth time is the time of receiving the second downlink control information, where the second downlink control information is used to determine whether the network device has received the medium access control element (MAC CE) information.

[0044] In one embodiment, the second downlink control information is used to schedule a second physical uplink shared channel (PUSCH);

[0045] the identifier of the hybrid automatic repeat request of the second PUSCH channel scheduled by the second downlink control information is identical to the identifier of the hybrid automatic repeat request of the first PUSCH channel, wherein the first PUSCH channel is used to transmit MAC CE information associated with the TRP at which the beam failure occurred and/or the new data indicator of the second PUSCH channel scheduled based on the second downlink control information is switched.

[0046] In one embodiment, the processing module determines whether a condition for starting a BFR operation based on random access is met in the absence of downlink control information during a second time interval after a fourth time, where the fourth time is the time of transmitting medium access control element (MAC CE) information associated with the TRP at which the beam failure occurred on the first physical uplink shared access channel (PUSCH).

[0047] In one embodiment, the processing module determines that the condition for starting a BFR operation based on random access is met if the detecting module detects among the plurality of TRPs a second TRP at which a beam failure occurred before a sixth time, where the sixth time is the beam update time of the first TRP.

[0048] In one embodiment, the processing module initiates a BFR operation for a particular TRP if the detecting module detects among the plurality of TRPs another second TRP at which a beam failure occurred after the sixth time.

[0049] In one embodiment, initiating a BFR operation for a particular TRP includes: initiating a BFR operation based on the PUCCH-SR and/or PUSCH MAC CE mechanisms.

[0050] In one embodiment, the processing unit is further configured to initiate a BFR operation for a particular TRP or to refuse to initiate a BFR operation for a particular TRP.

[0051] In one embodiment, a terminal configured with a plurality of TRPs includes: a terminal configured with a plurality of sets of reference signal resources for detecting a beam failure and/or a terminal configured with a plurality of control resource pool index values.

[0052] According to a third aspect of the embodiments of the present invention, a device for beam failure recovery (BFR) is provided. The device includes:

[0053] a processor and memory for storing instructions executed by the processor;

[0054] wherein the processor is configured to implement the BFR method according to the first aspect or any embodiment of the first aspect of the invention.

[0055] According to a fourth aspect of the embodiments of the present invention, a storage medium is provided. The storage medium stores instructions. When the processor of the terminal executes the instructions, the terminal is caused to implement the BFR method according to the first aspect or any embodiment of the first aspect of the invention.

[0056] The technical solutions proposed in the embodiments of the present invention can achieve the following advantageous effect. If a terminal is configured with a plurality of TRPs, beam failure detection is performed at the plurality of TRPs. When a beam failure is detected at one of the plurality of TRPs, a random access-based BFR operation is started. Thus, in a scenario with multiple TRPs, the random access-based BFR operation can be performed in a timely manner, thereby ensuring the promptness and efficiency of the BFR procedure.

[0057] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the present invention.

BRIEF DESCRIPTION OF DRAWINGS

[0058] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0059] Fig. 1 is a block diagram of a wireless communication system in accordance with one embodiment of the present invention.

[0060] Fig. 2 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0061] Fig. 3 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0062] Fig. 4 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0063] Fig. 5 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0064] Fig. 6 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0065] Fig. 7 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0066] Fig. 8 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0067] Fig. 9 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0068] Fig. 10 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0069] Fig. 11 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0070] Fig. 12 is a flow chart illustrating a method for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0071] Fig. 13 is a block diagram of a device for restoring communication after a beam failure in accordance with one embodiment of the present invention.

[0072] Fig. 14 is a block diagram of a device for restoring communication after a beam failure in accordance with one embodiment of the present invention.

DETAILED DESCRIPTION

[0073] The following is a detailed description of possible embodiments of the invention, examples of which are shown in the drawings. In the following references to the drawings, the same numbers in different drawings designate the same or similar elements, unless otherwise indicated. The implementations of possible embodiments discussed below do not exhaust all possible implementations that correspond to the present invention. On the contrary, they represent only examples of devices and methods that correspond to aspects of the present invention indicated in the appended claims.

[0074] A beam failure recovery (BFR) method according to embodiments of the present invention may be used in a wireless communication system shown in Fig. 1. The wireless communication system shown in Fig. 1 includes a terminal and a network device. The terminal is connected to the network device via radio resources for transmitting and receiving data.

[0075] It should be understood that the wireless communication system shown in Fig. 1 is given only as an example, therefore, other network devices, such as a backbone network device, a wireless repeater or a wireless backhaul device, which are not shown in Fig. 1, may be included in the wireless communication system. The number of network devices and the number of terminals included in the wireless communication system are not limited to the embodiments of the present invention.

[0076] It should also be understood that the wireless communication system in the embodiments of the present invention is a network that provides wireless communication functions. The wireless communication system may use various communication technologies such as Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency-Division Multiple Access (OFDMA), Single Carrier FDMA (SC-FDMA), and Carrier Sense Multiple Access With Collision Avoidance (CSMA/CA). Depending on factors such as capacity, speed and latency in various networks, a network may be classified as a second generation (2G), 3G, 4G or future advanced networks such as 5G, which may also be referred to as "NR networks". For ease of description, in the present invention, a wireless communication network is sometimes simply referred to as a network.

[0077] The network device considered in the present invention may also be called a radio access network device. The radio access network device may be a base station, an evolved Node Base station (eNB), a home base station, an access point (AP) in a Wi-Fi wireless access system, a wireless relay node, a wireless transit node, a transmission point (TP) or a TRP, a next generation Node Base station (gNB) in a NR system, or a component or part of devices included in a base station device. The network device may also be a device installed on a vehicle in a vehicle-to-vehicle (V2X) communication system. It should be understood that the specific technology and the specific form used for the network device are not limited to the embodiments of the present invention.

[0078] The terminal discussed in the present invention may also be called a terminal device, user equipment (UE), mobile station (MS) or mobile terminal (MT), and is a device that provides a user with voice communication and/or data transmission functions. For example, the terminal may be a portable device or a device installed on a vehicle with a wireless connection function. At present, the terminal may be, for example, a mobile phone, a Pocket Personal Computer (PPC), a portable computer, a Personal Digital Assistant (PDA), a notebook, a tablet computer, a wearable device, a device installed on a vehicle and other similar devices. In addition, the terminal device may also be a device installed on a vehicle in a V2X communication system. It should be understood that the specific technology and the specific form used for the terminal device are not limited to the embodiments of the present invention.

[0079] In the present invention, data transmission between a network device and a terminal is performed based on beams. When transmitting data between a network device and a terminal based on beams, the network device may use one or more transmit/receive points (TRPs) to serve the terminal. For example, the network device may use one or more TRPs to transmit data to the terminal over a physical downlink control channel (PDCCH). If the terminal detects that the radio channel quality of the reference signal resource used for failure detection is below a threshold, the terminal must initiate a beam failure recovery (BFR) operation. The reference signal resource used for failure detection may be explicitly configured by the base station. If the reference signal resource is not explicitly configured by the base station, the reference signal resource for the Quasi Co-Location (QCL) type D in the TCI (Transmission State Indication) state corresponding to the control resource set (CORESET) used for transmission on the PDCCH is used. The execution of the BFR operation by the terminal is also considered as connection recovery by the terminal.

[0080] In the related fields of technology, a mechanism for performing a BFR operation by a terminal includes a BFR for a specific cell. The BFR operation for a specific cell includes a BFR mechanism based on random access (BFR for a cell of the Spcell type) and a BFR mechanism based on a scheduling request (SR) in a physical uplink control channel (PUCCH) and/or a medium access control element (MAC CE) in a physical uplink shared access channel (PUSCH) (BFR for a cell of the Scell type). The mechanism for performing a BFR operation by a terminal also includes a BFR mechanism for a specific TRP. The BFR mechanism based on random access includes a contention-based random access (CBRA) method and a contention-free random access (CFRA) method. In the BFR operation for a Spcell, i.e., the BFR mechanism based on random access, the terminal initiates a random access procedure to request communication restoration after a beam failure. In the BFR operation of an Scell, i.e., BFR based on the PUCCH-SR and/or PUSCH MAC CE mechanism, the terminal performs the BFR operation based on the PUCCH-SR and/or PUSCH MAC CE mechanism. Upon detecting that a beam failure has occurred in the Scell, the terminal transmits the MAC CE information in the PUSCH resource to report information related to the BFR operation. The PUSCH resource can be obtained by transmitting an SR request in both the PUCCH-SR resource allocated for the BFR operation and other PUSCH resources. Based on the BFR mechanism for a specific TRP, the BFR operation of the Scell will be repeated.

[0081] In the related technical solutions, in the process of detecting a beam failure, the terminal usually monitors a reference signal (RS) that is used to detect a beam failure of a TRP. When the radio signal quality of the RS is below a threshold level for N times, the terminal determines that an RS failure has occurred. When all the RS signals used to detect a TRP failure fail, the terminal determines that the TRP has a beam failure. The related technical solutions use a PDCCH scenario between the terminal and the network device for multiple TRPs. In the PDCCH scenario with multiple TRPs, the terminal configures both the random access-based BFR mechanism and the TRP-specific BFR mechanism in the same cell. Since multiple sets of reference signals for failure detection correspond to multiple TRPs, multiple sets of reference signals for failure detection will be configured in one cell. Each of the plurality of reference signal sets for failure detection may be explicitly configured by the base station, or if the reference signal sets are not explicitly configured by the base station, they may be determined based on the QCL reference signal of type D in the TCI state of the CORESET. Existing technical solutions do not allow deciding whether to start the BFR operation for a specific cell or to perform BFR based on random access if a beam failure occurs at two or more TRPs among a plurality of TRPs.

[0082] In embodiments of the present invention, a BFR method is provided in which a random access based BFR operation is started when a TRP at which a beam failure has occurred is detected among a plurality of TRPs.

[0083] For convenience of description, in the embodiments of the present invention, one TRP of at least two TRPs at which a beam failure occurs among a plurality of TRPs configured for a terminal is called a “first TRP” and the other is called a “second TRP”.

[0084] Fig. 2 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 2, the BFR method is implemented by a terminal. The terminal is configured to use a random access based BFR mechanism and a TRP-specific BFR mechanism for the same cell. The BFR method according to embodiments of the present invention includes the following actions.

[0085] In step S11, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[0086] In step S12, a random access based BFR operation is started when the first TRP at which a beam failure has occurred is detected among the plurality of TRPs.

[0087] In embodiments of the present invention, the expression "the terminal is configured with a plurality of TRPs" means that the terminal is configured with a plurality of sets of reference signal resources for detecting a beam failure and/or the terminal is configured with a plurality of control resource pool index values (CORES ETPoolIndex values). The expression "the terminal is configured with a plurality of sets of reference signal resources for detecting a beam failure" means that the terminal is explicitly configured with a plurality of sets of reference signal resources for detecting a failure. If the reference signal resource sets for failure detection are not explicitly configured in the terminal, the terminal may determine one or more reference signal resource sets for failure detection based on the CORESETPoolIndex or CORESETGroup parameters. For example, if all CORE SETs of the terminal correspond to the same CORESETPoolIndex or CORESETGroup value, the terminal determines the reference signal resource used for failure detection based on the QCL reference signal resource of type D of the TCI state of at least one CORESET among all CORESETs. If all CORESETs of the terminal correspond to different CORESETPoolIndex or CORESETGroup values, the terminal determines the reference signal resource used for failure detection corresponding to each CORESETPoolIndex or CORESETGroup value based on the QCL reference signal resource of the TCI state type D of at least one CORESET among all CORESETs of each CORESETPoolIndex or CORESETGroup value. Each CORESETPoolIndex or CORESETGroup value corresponds to a specific reference signal resource used for failure detection.

[0088] In all embodiments of the present invention, the expression "a terminal configured with a plurality of TRPs" means that the terminal is configured to perform uplink and downlink data exchange with a plurality of TRPs of a base station. In some embodiments, the terminal may determine multiple TRP configurations depending on the communication standard. Or, the terminal may determine multiple TRP configurations based on configuration parameters or configuration signaling transmitted by the base station. Or, the terminal may negotiate with the base station the selection of a plurality of TRPs, wherein the plurality of TRPs is a subset or a true subset of the plurality of TRPs of the base station (therefore, there may be a situation in which the base station maps different UEs to different sets of TRPs, or when several UEs map to one set of TRPs, and other UEs map to different sets of TRPs). This information will not be repeated again.

[0089] In embodiments of the present invention, the expression "a terminal performing beam failure detection on a plurality of TRPs" means that when performing beam failure detection on some or all of the TRPs included in the plurality of TRPs, the terminal may detect sets of reference signals corresponding to these TRPs. For example, the terminal detects corresponding sets of reference signals used to perform beam failure detection on a first TRP and/or a second TRP.

[0090] In embodiments of the present invention, a conventional beam failure detection method may be used to determine the presence of a TRP at which a beam failure has occurred. For example, a beam failure at a TRP is detected when a decrease in the quality of the radio channel below a threshold is detected for N times for each reference signal (RS) in the set of reference signals used to detect a failure at this TRP.

[0091] In embodiments of the present invention, when a first TRP at which a beam failure has occurred is detected among a plurality of TRPs, a random access-based BFR operation may be started. Thus, in a scenario with multiple TRPs, the random access-based BFR operation is performed in a timely manner, thereby ensuring the promptness and efficiency of the BFR procedure.

[0092] In the BFR method according to the embodiments of the present invention, the terminal may start a random access-based BFR operation by determining that a condition for starting a random access-based BFR operation is met.

[0093] Fig. 3 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 3, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[0094] In step S21, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[0095] In step S22, a random access-based BFR operation is started when the first TRP at which a beam failure has occurred is detected among a plurality of TRPs, and it is determined that a condition for starting a random access-based BFR operation is met.

[0096] In embodiments of the present invention, the execution of the condition for starting the BFR operation based on random access may be determined in the process of performing the BFR operation for a specific TRP after detecting among a plurality of TRPs the first TRP at which a beam failure has occurred.

[0097] In the BFR method according to the embodiments of the present invention, if the terminal detects a first TRP at which a beam failure has occurred among a plurality of TRPs, the terminal may wait for a PUCCH resource closest in time among the other PUCCHs and send a scheduling request (SR) on this PUCCH resource. For convenience of description, in the embodiments of the present invention, the time when the terminal detects the first TRP at which a beam failure has occurred among the plurality of TRPs is called a "first time" (and is denoted as t1), and the time when the terminal transmits the SR on the PUCCH-SR resource is called a "second time" (and is denoted as t2). For example, the terminal detects respective sets of reference signals used to perform the beam failure detection at the first TRP and/or the second TRP. The terminal detects that a beam failure has occurred at the first TRP at the first time t1, the terminal waits for the PUCCH-SR resource that appears at the second time t2 closest to the first time t1, and then the terminal sends an SR request on the PUCCH-SR resource at the second time t2.

[0098] It should be understood that the terms “first time” and t1 can be used interchangeably in the embodiments of the present invention, and those skilled in the art will understand that the terms “first time” or t1 are the same in meaning and significance in each embodiment of the present invention.

[0099] It should also be understood that the terms “second time” and t2 can be used interchangeably in embodiments of the present invention, and those skilled in the art will understand that the terms “second time” or t2 are the same in meaning and significance in each embodiment of the present invention.

[00100] Fig. 4 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 4, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00101] In step S31, a beam failure is detected on a plurality of TRPs if the terminal is configured with a plurality of TRPs.

[00102] In step S32, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the second time is detected among the plurality of TRPs.

[00103] In one embodiment of the present invention, the condition for starting the random access BFR operation may be determined when a second TRP is detected among a plurality of TRPs at which a beam failure occurred after a first time and before a second time. The first time is the time of detecting the beam failure at the first TRP, and the second time (t2) is the time of transmitting the SR request in the PUCCH channel resource.

[00104] According to the above example, when the terminal also detects a second TRP at which a beam failure occurred before time t2, a random access based BFR operation is started.

[00105] In another embodiment of the present invention, after transmitting an SR request in the PUCCH-SR resource at time t2, the terminal may receive Downlink Control Information (DCI) for scheduling the PUSCH channel after a certain period of time has elapsed. For convenience of further description, the DCI information, which is used for scheduling the PUSCH channel, is called "first DCI information", and the time of receiving the first DCI information is called "third time" (and is denoted as t3).

[00106] It should be understood that the terms “third time” and t3 can be used interchangeably in the embodiments of the present invention, and those skilled in the art will understand that the terms “third time” or t3 are the same in meaning and significance in each embodiment of the present invention.

[00107] Fig. 5 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 5, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00108] In step S41, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00109] In step S42, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the third time is detected among the plurality of TRPs.

[00110] In one embodiment, the condition for starting a random access BFR operation is determined when a second TRP is detected among a plurality of TRPs at which a beam failure occurred at or after a second time and before a third time. The second time is the time of transmitting an SR request on a PUCCH channel resource, and the third time is the time of receiving the first DCI information for scheduling the PUSCH channel.

[00111] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t2 and before time t3.

[00112] In another embodiment of the present invention, the condition for starting a random access BFR operation is determined when a second TRP is detected among a plurality of TRPs at which a beam failure occurred before a third time.

[00113] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time tl and before time t3.

[00114] Fig. 6 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 6, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00115] In step S51, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00116] In step S52, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the third time is detected among the plurality of TRPs, and DCI information is not received during the first time interval after the second time.

[00117] In one embodiment of the present invention, if DCI information is not received within a certain period of time (i.e., a first time interval denoted by T1) after the second time, it is determined that a condition for starting a random access-based BFR operation is met. For example, if the terminal has not received the first DCI information from time t2 to time (t2+T1), a random access-based BFR operation is started. In another example, if the terminal has not received DCI information (hereinafter referred to as the second DCI information) from time t2 to time (t2+T1), which is used to determine whether the network device has received MAC CE information, a random access-based BFR operation is started.

[00118] In one embodiment of the present invention, the terminal may receive the first DCI information for scheduling the PUSCH at a third time, and after a certain period of time, transmit MAC CE information related to the TRP at which the beam failure occurred on the PUSCH. For convenience of description, the time when the MAC CE information related to the TRP at which the beam failure occurred is transmitted on the PUSCH is called the "fourth time" (and is denoted as t4).

[00119] It should also be understood that the terms “fourth time point” and t4 can be used interchangeably in the embodiments of the present invention and it should be understood by those skilled in the art that the terms “fourth time point” or t4 are the same in meaning and significance in each embodiment of the present invention.

[00120] Fig. 7 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 7, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00121] In step S61, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00122] In step S62, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the fourth time is detected among the plurality of TRPs.

[00123] The fourth time instant is the time instant of transmission of MAC CE information related to the TRP at which the beam failure occurred on the PUSCH channel.

[00124] It should be noted that the PUSCH used to transmit the MAC CE information related to the TRP at which the beam failure occurred may be scheduled based on the first DCI information or may be a preconfigured grant of a PUSCH of type 1 or type 2. For convenience of description, in the following embodiments, the PUSCH used to transmit the MAC CE information related to the TRP at which the beam failure occurred is called the “first PUSCH”.

[00125] In one embodiment, the condition for starting a random access BFR operation is determined to be met when a second TRP is detected among the plurality of TRPs at which a beam failure occurred at or after a third time and before a fourth time.

[00126] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t3 and before time t4.

[00127] In another embodiment, the execution of the condition for starting a BFR operation based on random access is determined upon detection of a second TRP among the plurality of TRPs at which a beam failure occurred before a fourth time.

[00128] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t1 and before time t4.

[00129] In addition, in the embodiments of the present invention, it is also determined that a condition for starting a BFR operation based on random access is met when a second TRP at which a beam failure occurred at a fourth time is detected among a plurality of TRPs, and if the failure occurred with a beam corresponding to the first PUSCH.

[00130] Fig. 8 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 8, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00131] In step S71, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00132] In step S72, when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the fourth time is detected among the plurality of TRPs, and the beam at which the failure occurred corresponds to the first PUSCH, a BFR operation based on random access is started.

[00133] In one embodiment, the condition for starting a random access BFR operation may be determined to be met upon detection of a second TRP among the plurality of TRPs at which a beam failure occurred at or after a third time and before a fourth time, and also if the beam at which the failure occurred corresponds to the first PUSCH.

[00134] In another embodiment, the fulfillment of the condition for starting the BFR operation based on random access may be determined upon detection of a second TRP among the plurality of TRPs at which a beam failure occurred before a fourth time point, and also if the beam at which the failure occurred corresponds to the first PUSCH channel.

[00135] In embodiments of the present invention, the terminal transmits MAC CE information related to the TRP at which the beam failure occurred on the PUSCH at a fourth time and receives the second DCI information after a certain period of time. The time of receiving the second DCI information is hereinafter referred to as the "fifth time" (and denoted as t5). The fifth time is the time of receiving the second DCI information, wherein the second DCI information is used to determine whether the network device has received the MAC CE information.

[00136] It should also be understood that the terms “fifth time point” and t5 in the embodiments of the present invention can be used interchangeably and those skilled in the art will understand that the terms “fifth time point” or t5 are the same in meaning and significance in each embodiment of the present invention.

[00137] Fig. 9 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 9, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00138] In step S81, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00139] In step S82, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the fifth time is detected among the plurality of TRPs.

[00140] In one embodiment, the condition for starting a random access BFR operation is determined when a second TRP is detected among the plurality of TRPs at which a beam failure occurred at or after a fourth time and before a fifth time. The fourth time is the time of transmitting MAC CE information related to the TRP at which the beam failure occurred on the PUSCH.

[00141] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t4 and before time t5.

[00142] In one embodiment, the execution of the condition for starting the BFR operation based on random access is determined when a second TRP is detected among the plurality of TRPs at which a beam failure occurred before a fifth time. The fifth time is the time of receiving the second DCI information, where the second DCI information is used to determine whether the network device has received the MAC CE information.

[00143] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t1 and before time t5.

[00144] Furthermore, in the embodiments of the present invention, it is determined that the condition for starting the random access-based BFR is met when the terminal detects the second TRP at which the beam failure has occurred before the fifth time, but the terminal does not receive the second DCI information within a certain period of time (hereinafter referred to as the second time interval and denoted by T2) after the fourth time. That is, if the second DCI information is not received from the time t4 to the time (t4+T2), the random access-based BFR operation is started.

[00145] In embodiments of the present invention, the second DCI information is used to determine whether the network device has received the MAC CE information. The terminal updates the beam after receiving the second DCI information for a certain period of time. In embodiments of the present invention, the second DCI information can also be used to schedule a PUSCH channel. For convenience of description, the PUSCH channel scheduled based on the second DCI information is called a "second PUSCH channel". The Hybrid Automatic Repeat Request (HARQ) identifier (ID) of the second PUSCH channel is identical to the HARQ ID of the first PUSCH channel, but the New Data Indicator (NDI) is switched. The first PUSCH channel is scheduled based on the first DCI information, or the first PUSCH channel is a configured PUSCH channel grant of type 1 or 2.

[00146] The beam update includes updating at least one of the following parameters: a QCL Type-D parameter, an uplink spatial filter (UL TX spatial filter), spatial relationship information (spatialrelationinfo), a transmission configuration indication state (TCI state), a downlink TCI state (DL TCI state), or an uplink TCI state (UL TCI state).

[00147] Fig. 10 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 10, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00148] In step S91, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00149] In step S92, a random access based BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before a fifth time is detected among the plurality of TRPs, and DCI information is not received during a second time interval after the fourth time.

[00150] In one embodiment, it is detected that among the plurality of TRPs, there is a second TRP at which a beam failure occurred at or after a fourth time and before a fifth time, and no DCI information was received during a second time interval after the fourth time.

[00151] According to the above example, if the terminal detects that a beam failure has occurred at the second TRP at or after time t4 and before time t5, but the terminal has not received the second DCI information from time t4 to time (t4+T2), then the terminal starts a BFR operation based on random access.

[00152] In another embodiment, among the plurality of TRPs, a second TRP is detected at which a beam failure occurred before a fifth time instant, and during a second time interval after the fourth time instant, no DCI information was received.

[00153] According to the above example, if the terminal detects that there is a second TRP at which a beam failure occurred at or after time t1 and before time t5, but the terminal has not received the second DCI information from time t4 to time (t4+T2), then the terminal starts a BFR operation based on random access.

[00154] In embodiments of the present invention, after receiving the second DCI information at the fifth time, the terminal may update the beam of the TRP at which the beam failure occurred after a certain time interval, that is, the beam of the first TRP is updated. In embodiments of the present invention, the beam update time of the first TRP is called the "sixth time."

[00155] It should also be understood that the terms “sixth point in time” and t6 can be used interchangeably in the embodiments of the present invention and it should be understood by those skilled in the art that the terms “sixth point in time” or t6 are the same in meaning and significance in each embodiment of the present invention.

[00156] In one embodiment, the execution of the condition for starting the random access BFR operation is determined when a second TRP is detected among the plurality of TRPs at which a beam failure occurred before a sixth time. The fifth time is the time of receiving the second DCI information. The second DCI information is used to determine whether the network device has received the MAC CE information. The sixth time is the time of updating the beam of the first TRP.

[00157] Fig. 11 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 11, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00158] In step S101, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00159] In step S102, a random access BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the sixth time is detected among the plurality of TRPs.

[00160] In one embodiment, the execution of the condition for starting the random access BFR operation is determined when a second TRP is detected among the plurality of TRPs at which a beam failure occurred at or after a fifth time and before a sixth time. The fifth time is the time of receiving the second DCI information. The second DCI information is used to determine whether the network device has received the MAC CE information. The sixth time is the time of updating the beam of the first TRP.

[00161] According to the above example, the terminal starts a random access based BFR operation upon detecting a beam failure at the second TRP at or after time t5 and before time t6.

[00162] In another embodiment, the execution of the condition for starting a BFR operation based on random access is determined upon detection of a second TRP among the plurality of TRPs at which a beam failure occurred before a sixth time point.

[00163] According to the above example, the terminal starts a random access based BFR operation upon detecting a second TRP at which a beam failure occurred at or after time t1 and before time t6.

[00164] In embodiments of the present invention, a plurality of TRPs may be continuously monitored to determine whether a beam failure has occurred. The BFR operation for a specific TRP is started when another second TRP is detected among the plurality of TRPs at which a beam failure has occurred after a sixth time.

[00165] Fig. 12 is a flow chart illustrating a BFR method according to one embodiment. As shown in Fig. 12, the BFR method is implemented by a terminal. The BFR method includes the following sequence of actions.

[00166] In step S111, a beam failure is detected on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs.

[00167] In step S112, a random access BFR operation is started when a first TRP at which a beam failure occurred is detected among the plurality of TRPs, and a second TRP at which a beam failure occurred before the sixth time is detected among the plurality of TRPs.

[00168] In step S113, the BFR operation for a specific TRP is started upon detection of another second TRP among the plurality of TRPs at which a beam failure occurred after the sixth time point.

[00169] In embodiments of the present invention, starting a BFR operation for a specific TRP means starting a BFR operation based on the PUCCH-SR and/or PUSCH MAC CE mechanisms.

[00170] In one example given in the present invention, two TRPs are configured in the terminal, i.e., a first TRP and a second TRP. The BFR operation for a particular TRP can be represented as the following sequence of actions.

[00171] a) The terminal detects the corresponding sets of reference signals used to perform beam failure detection at the first TRP and/or the second TRP. If it is detected that a beam failure has occurred at the first TRP at time t1, the terminal expects to send a PUCCH-SR request at time t2 closest to time t1. In the above example, no PUCCH-SR request has been sent before time t1, or there will be no available PUSCH channel resources in the next time interval if the terminal does not send a PUSCCH-SR request at time t2.

[00172] It should be understood that in embodiments of the present invention, a conventional method can be used to detect a beam failure at a certain TRP. That is, for each RS signal in the set of reference signals, it is detected that the quality of the radio channel falls below a threshold level for N times.

[00173] b) The terminal waits for the first DCI information to arrive at time t3, which is used to schedule the first PUSCH channel.

[00174] c) The terminal receives the first DCI information used for scheduling the first PUSCH at time t3 and waits some time until time t4 to transmit on the PUSCH the MAC CE information related to the TRP at which the beam failure occurred.

[00175] d) The terminal transmits MAC CE information related to the TRP at which the beam failure occurred on the first PUSCH at time t4 and waits for the second DCI information to arrive at time t5. This second DCI information is used to determine whether the base station has received the MAC CE information. After the expiration of the TO interval after receiving the second DCI information, the terminal updates the beam.

[00176] It should be understood that the second DCI information can also be used to schedule the second PUSCH. The HARQ ID of the second PUSCH is identical to the HARQ ID of the first PUSCH, but the new data indicator NDI is switched. The first PUSCH is scheduled based on the first DCI information, or the first PUSCH is a configured PUSCH grant of type 1 or 2.

[00177] In addition, updating the beam includes updating at least one of the following parameters: a QCL Type-D parameter, a UL TX spatial filter, spatialrelationinfo, a TCI state, a DL TCI state, or a UL TCI state.

[00178] d) The terminal receives the second DCI information at time t5 and waits some time until time t6 to update the beam of the TRP at which the beam failure occurred.

[00179] Furthermore, in the embodiments of the present invention, when a random access-based BFR operation is started, a BFR operation for a specific TRP may or may not be started. That is, when a random access-based BFR operation is started, starting a BFR operation for a specific TRP or not starting it will not affect the execution of the random access-based BFR operation.

[00180] Taking into account the above-described embodiments of the invention, the condition for starting a random access-based BFR operation according to the embodiments of the present invention may include at least one of the following situations.

[00181] a) When the terminal detects that a beam failure has also occurred at the second TRP before time t2, the terminal starts a random access based BFR operation.

[00182] b) When the terminal detects that a beam failure has also occurred at the second TRP before time t3, the terminal starts a random access based BFR operation.

[00183] c) When the terminal detects that a beam failure has occurred at the second TRP at or after time t2 and before time t3, but the terminal has not received the first DCI information from time t2 to time (t2+T1), the terminal starts a BFR operation based on random access.

[00184] d) When the terminal detects that a beam failure has also occurred at the second TRP before time t4, the terminal starts a random access based BFR operation.

[00185] d) When the terminal detects that a beam failure has occurred at the second TRP at or after time t3 and before time t4, and if the failure has occurred with the beam corresponding to the first PUSCH, the terminal starts a random access based BFR operation.

[00186] e) When the terminal detects that a beam failure has also occurred at the second TRP before time t5, the terminal starts a random access based BFR operation.

[00187] g) When the terminal detects that a beam failure has occurred at the second TRP at or after time t4 and before time t5, but the terminal has not received the second DCI information from time t4 to time (t4+T2), the terminal starts a BFR operation based on random access.

[00188] c) When the terminal detects that a beam failure has also occurred at the second TRP before time t6, the terminal starts a random access based BFR operation.

[00189] i) When the terminal again detects that a beam failure has occurred at the second TRP after time t6, the terminal initiates only the BFR operation for the specific TRP

[00190] When using the BFR method according to the embodiments of the present invention in a scenario with PDCCHs for multiple TRPs in the same cell, for a terminal in which BFR operations for a specific TRP and for a specific cell are simultaneously configured, a condition for starting the BFR operation for the specific cell is determined to ensure the efficiency and effectiveness of the BFR procedure.

[00191] It should be understood by those skilled in the art that the various embodiments or implementations mentioned above in describing the embodiments of the present invention can be used both in combination with each other and independently. Regardless of whether they are used separately or in combination with the embodiments described above, the principles of their implementation are similar. Some embodiments of the present invention are described together with accompanying implementations. Of course, it should be understood by those skilled in the art that such examples do not impose limitations on the embodiments of the present invention.

[00192] In accordance with the same concept, embodiments of the present invention also provide a BFR device.

[00193] It is obvious that in order to implement the above-mentioned functions, the BFR device according to the embodiments of the present invention includes hardware structures and/or software modules corresponding to each function. In combination with the blocks and algorithms of actions from the examples described in the embodiments of the present invention, the embodiments can be implemented by hardware or a combination of hardware and computer software. Whether a certain function will be performed by hardware or software-controlled hardware depends on the specific systems and requirements for the development of technical solutions. To implement the described functions in each specific system, those skilled in the art can use various methods, and such implementation should not be considered as going beyond the scope of the technical solutions corresponding to the embodiments of the present invention.

[00194] Fig. 13 is a block diagram of a BFR device according to one embodiment of the present invention. As shown in Fig. 13, the BFR device 100 includes a detection module 101 and a processing module 102.

[00195] The detection module 101 is configured to perform beam failure detection on a plurality of TRPs of the terminal if the terminal is configured with a plurality of TRPs. The processing module 102 is configured to start a BFR operation based on random access upon detection of the first TRP at which a beam failure has occurred among the plurality of TRPs.

[00196] In one embodiment, the processing module 102 is further configured to determine whether a condition for starting the random access based BFR operation is met before starting the random access based BFR operation.

[00197] In one embodiment, the processing unit 102 determines whether the condition for starting the random access BFR operation is met if the detection unit 101 detects a second TRP among the plurality of TRPs at which a beam failure has occurred before a second time. The first time is the time of detecting the beam failure at the first TRP, and the second time is the time of transmitting the SR request in the PUCCH channel resource.

[00198] In one embodiment, the processing unit 102 determines whether the condition for starting the BFR operation based on random access is met, the detection unit 101 detects among the plurality of TRPs a second TRP at which a beam failure occurred before a third time point. The third time point is the time of receiving the first DCI information for scheduling the PUSCH channel.

[00199] In one embodiment, the processing unit 102 determines whether the condition for starting the BFR operation based on random access is met if the DCI information has not been received within a first time interval after a second time instant. The second time instant is the time of transmission of the SR request in the PUCCH channel resource.

[00200] In one embodiment, the processing unit 102 determines whether the condition for starting the BFR operation based on random access is met, the detection unit 101 detects among the plurality of TRPs a second TRP at which the beam failure occurred before a fourth time. The fourth time is the time of transmitting MAC CE information related to the TRP at which the beam failure occurred in the first PUSCH.

[00201] In one embodiment, the processing module 102 determines whether the condition for starting the random access BFR operation is met if the beam in which the failure occurred corresponds to the first PUSCH channel.

[00202] In one embodiment, the processing unit 102 determines whether the condition for starting the BFR operation based on random access is met, the detection unit 101 detects among the plurality of TRPs a second TRP at which a beam failure occurred before a fifth time. The fifth time is the time of receiving the second DCI information. The second DCI information is configured so that it can be determined whether the network device has received the MAC CE information.

[00203] In one embodiment, the second DCI information is used to schedule the second PUSCH channel.

[00204] The HARQ ID of the second PUSCH scheduled based on the second DCI information is identical to the HARQ ID of the first PUSCH. The first PUSCH is scheduled based on the first DCI information, or the first PUSCH is a configured channel grant of the first PUSCH of type 1 or 2, and/or the new data indicator NDI is toggled in the second PUSCH scheduled based on the second DCI information.

[00205] In one embodiment, the processing unit 102 determines whether the condition for starting the random access BFR operation is met if the DCI information has not been received within a second time interval after a fourth time. The fourth time is the time of transmitting the MAC CE information related to the TRP at which the beam failure occurred on the first PUSCH.

[00206] In one embodiment, the processing unit 102 determines that the condition for starting the BFR operation based on random access is met, the detection unit 101 detects among the plurality of TRPs a second TRP at which a beam failure occurred before a sixth time point. The sixth time point is the beam update time of the first TRP.

[00207] In one embodiment, the processing module 102 initiates a BFR operation for a particular TRP if the detection module 101 detects among the plurality of TRPs another second TRP at which a beam failure occurred after the sixth time.

[00208] In one embodiment, initiating a BFR operation for a specific TRP includes: initiating a BFR operation based on the PUCCH-SR and/or PUSCH MAC CE mechanisms.

[00209] In one embodiment, the processing module 102 is further configured to initiate a BFR operation for a particular TRP or to refuse to initiate a BFR operation for a particular TRP.

[00210] In one embodiment, a terminal configured with a plurality of TRPs includes: a terminal configured with a plurality of sets of reference signal resources for detecting a beam failure and/or a terminal configured with a plurality of control resource pool index values.

[00211] Since the description of the embodiments of the method describes in detail the features of performing operations by each module, their detailed description is not given here.

[00212] Fig. 14 shows a block diagram of a BFR device 200 according to one embodiment of the present invention. For example, the device 200 may be a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, or a PDA.

[00213] As shown in Fig. 14, device 200 may include one or more of the following components: a processor component 202, memory 204, power component 206, multimedia component 208, audio component 210, input/output (I/O) interface 212, measurement component 214, and communication component 216.

[00214] The processor component 202 typically controls the general functions of the device 200, including functions related to display, telephone calls, data transmission, camera operation, and recording. The processor component 202 may include one or more processors 220 that execute instructions to implement all or part of the actions of the method described above. In addition, the processor component 202 may contain one or more modules that facilitate interaction of the processor component 202 with other components. For example, the processor component 202 may include a multimedia module to facilitate interaction between the multimedia component 208 and the processor component 202.

[00215] Memory 204 is configured to store various types of data necessary for the operation of device 200. Such data includes instructions for any applications or methods that are executed by device 200, contact list data, phone book data, messages, images, videos, etc. Memory 204 can be implemented on the basis of any type of volatile or nonvolatile memory devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

[00216] Power component 206 provides power to various components of device 200. Power component 206 may comprise a power management system, one or more power sources, and any other components associated with generating, regulating, and distributing power in device 200.

[00217] The multimedia component 208 comprises a screen that serves as an interface for outputting information between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen comprises a touch panel, it may be implemented as a touch screen for receiving input signals from the user. The touch panel comprises one or more touch sensors for recognizing touches, movements and gestures on the touch panel. The touch sensors may recognize not only the location of a touch or finger movement, but also the period of time and the force of pressing associated with a touch or finger movement. In some embodiments, the multimedia component 208 comprises a front camera and/or a rear camera. When the device 200 is in an operating mode, such as in a photo or video shooting mode, the front and/or rear cameras may receive external multimedia data. Each front and rear camera may be a system with a fixed focal length or allow changing the focal length and optical zoom.

[00218] The audio component 210 is configured to output and/or input audio signals. For example, the audio component 210 comprises a microphone (MIC) configured to receive an external audio signal when the device 200 is in an operating mode, such as in the call, recording, and voice recognition modes. The received audio signal can then be stored in the memory 204 or transmitted using the communication component 216. In some embodiments, the audio component 210 further comprises a speaker for outputting audio signals.

[00219] The input/output interface 212 provides an interface between the processor component 202 and peripheral interface modules such as a keyboard, a control wheel, buttons, and the like. The buttons may include, but are not limited to, a home screen button, a volume control button, a start button, and a lock button.

[00220] The sensing component 214 comprises one or more sensors for assessing the state of various aspects of the device 200. For example, the sensing component 214 may determine the open and closed state of the device 200, the relative location of components of the device 200, such as a display and a keyboard, a change in the position of the device 200 or a component thereof, the presence or absence of contact of the user with the device 200, the orientation or acceleration/deceleration of the device 200, and a change in the temperature of the device 200. The sensing component 214 may include a presence sensor configured to detect nearby objects without physical contact. The sensing component 214 may also include an illumination sensor, such as an image sensor based on CMOS or CCD technology, for use in image processing applications. In some embodiments, the sensing component 214 may also include an accelerometer sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[00221] The communication component 216 is configured to facilitate wired or wireless communication between the device 200 and other devices. The device 200 can access wireless networks based on Wi-Fi, 2G, 4G standards, or combinations thereof. In one embodiment, the communication component 216 receives a broadcast signal from an external broadcast control system or broadcast information associated therewith over a broadcast channel. In one embodiment, the communication component 216 further includes a contactless communication (NFC) module to provide communication over short distances. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[00222] In embodiments, the device 200 may be implemented using one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), programmable logic devices (PLUs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to implement the methods described above.

[00223] In embodiments, a physical computer-readable storage medium, such as memory 204, with instructions that are executed by processor 220 in device 200 to implement the method described above is also provided. For example, the physical computer-readable storage medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, or optical storage device.

[00224] It should also be understood that the term "plurality" in the present invention refers to two or more objects, as do other quantifier terms. The term "and/or" describes a relationship of related objects and denotes three options for relationships, for example, "A and/or B" denotes that only A exists, both A and B exist, and only B exists. The symbol "/" generally indicates that the related objects specified before and after the symbol are in an "or" relationship. Unless otherwise clearly evident from the context, terms used in the singular imply the possibility of a plurality thereof.

[00225] It should also be understood that the terms "first, second, etc." are used to describe different types of information, but they do not impose limitations on this information. These terms are used only to indicate differences between information of the same type and do not determine a specific order or degree of importance. In fact, the expressions "first" and "second" are interchangeable. For example, first information may also be referred to as second information, and second information may similarly be referred to as first information without violating the scope of the present invention.

[00226] It should also be understood that although the operations in the embodiments of the invention are described in the drawings in a specific order, this should not be construed as a requirement to perform the operations in the specific sequence shown or in strict sequence, nor as a requirement to perform all of the indicated operations to obtain the desired result. In certain circumstances, multitasking and parallel processing may be advantageous.

[00227] Other embodiments of the present invention will become apparent to those skilled in the art from the description of the technical characteristics and practical implementation of the present invention. The present application covers any modifications, uses or adaptations of the present invention that are consistent with its basic principles, including such departures from it that are consistent with known or generally accepted practice in the art. The described technical characteristics and examples should be considered only as illustration, and the true scope and spirit of the invention is determined by the claims below.

[00228] It should be understood that the present invention is not limited to an exact reproduction of the system described above and illustrated in the accompanying drawings, and that various modifications and changes can be made within the scope of the present invention. It is intended that the scope of the present invention be limited only by the claims.

Claims (63)

1. A method for restoring communication after a beam failure, performed by a terminal and including: performing beam failure detection on a plurality of transmit/receive points (TRPs) of the terminal if the terminal is configured with multiple TRPs; and initiating random access beam failure recovery when the first TRP at which a beam failure occurred is detected among the plurality of TRPs; wherein before starting the restoration of communication after a beam failure based on random access, the method includes: determining the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access; wherein the determination of the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access includes: determining whether a condition for starting a beam failure recovery is met based on random access upon detection of a second TRP among a plurality of TRPs at which a beam failure occurred after a first time point and before a second time point; where the first time instant is the time of detection of the beam failure at the first TRP, and the second time instant is the time of transmission of the scheduling request (SR) in the physical uplink control channel (PUCCH) resource. 2. A method for restoring communication after a beam failure, performed by the terminal and including: performing beam failure detection on a plurality of transmit/receive points (TRPs) of the terminal if the terminal is configured with multiple TRPs; and initiating random access beam failure recovery when the first TRP at which a beam failure occurred is detected among the plurality of TRPs; wherein before starting the restoration of communication after a beam failure based on random access, the method includes: determining whether a condition for triggering the recovery of communication after a beam failure based on random access is met; and wherein the determination of the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access includes: determining whether a condition for starting communication restoration after a beam failure based on random access is met upon detection of a second TRP point among a plurality of TRP points at which a beam failure occurred before a third time point; where the third time instant is the instant of receiving the first downlink control information for scheduling the physical uplink shared channel (PUSCH). 3. The method according to claim 2, wherein determining whether the condition for starting communication restoration after a beam failure based on random access is met includes: determining whether a condition for starting a beam failure recovery based on random access is met in the absence of downlink control information during a first time interval after a second time instant, where the second time instant is the time of sending a scheduling request (SR) in a physical uplink control channel (PUCCH) resource. 4. A method for restoring communication after a beam failure, performed by the terminal and including: performing beam failure detection on a plurality of transmit/receive points (TRPs) of the terminal if the terminal is configured with multiple TRPs; and initiating random access beam failure recovery when the first TRP at which a beam failure occurred is detected among the plurality of TRPs; wherein before starting the restoration of communication after a beam failure based on random access, the method includes: determining whether a condition for triggering the recovery of communication after a beam failure based on random access is met; and wherein the determination of the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access includes: determining whether a condition for starting communication restoration after a beam failure based on random access is met upon detection of a second TRP point among a plurality of TRP points at which a beam failure occurred before a fourth time point; where the fourth instant in time is the instant of transmission of the medium access control element (MAC CE) information related to the first TRP at which the beam failure occurred, in the first physical uplink shared channel (PUSCH). 5. The method according to claim 4, wherein determining the fulfillment of the condition for starting communication restoration after a beam failure based on random access includes: determining whether a condition for starting communication restoration after a beam failure based on random access is met if the failure occurred in the beam corresponding to the first PUSCH channel; wherein the first PUSCH channel is scheduled based on the first downlink control information, or the first PUSCH channel is a configured PUSCH channel grant of type 1 or 2. 6. A method for restoring communication after a beam failure, performed by the terminal and including: performing beam failure detection on a plurality of transmit/receive points (TRPs) of the terminal if the terminal is configured with multiple TRPs; and initiating random access beam failure recovery when the first TRP at which a beam failure occurred is detected among the plurality of TRPs; wherein before starting the restoration of communication after a beam failure based on random access, the method includes: determining whether a condition for triggering the recovery of communication after a beam failure based on random access is met; and wherein the determination of the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access includes: determining whether a condition for starting communication restoration after a beam failure based on random access is met upon detection of a second TRP point among a plurality of TRP points at which a beam failure occurred before a fifth point in time; where the fifth time is the time of receiving the second downlink control information, wherein the second downlink control information is used to determine whether the network device has received the MAC CE information. 7. The method of claim 6, wherein the second downlink control information is used to schedule a second physical uplink shared channel (PUSCH); or the hybrid automatic repeat request identifier of the second PUSCH scheduled by the second downlink control information is identical to the hybrid automatic repeat request identifier of the first PUSCH, wherein the first PUSCH is used to transmit MAC CE information associated with the first TRP at which the beam failure occurred; or the indicator of new data of the second PUSCH channel scheduled based on the second downlink control information is switched. 8. The method according to claim 6, wherein determining whether the condition for starting communication restoration after a beam failure based on random access is met includes: determining whether a beam failure recovery trigger condition is met based on random access in the absence of downlink control information during a second time interval after a fourth time point, where the fourth time point is the time of transmitting MAC CE information related to the first TRP at which the beam failure occurred on the first physical uplink shared channel (PUSCH). 9. A method for restoring communication after a beam failure, performed by a terminal and including: performing beam failure detection on a plurality of transmit/receive points (TRPs) of the terminal if the terminal is configured with multiple TRPs; and initiating random access beam failure recovery when the first TRP at which a beam failure occurred is detected among the plurality of TRPs; wherein before starting the restoration of communication after a beam failure based on random access, the method includes: determining whether a condition for triggering the recovery of communication after a beam failure based on random access is met; and wherein the determination of the fulfillment of the condition for starting the restoration of communication after a beam failure based on random access includes: determining whether a condition for starting communication restoration after a beam failure based on random access is met upon detection of a second TRP point among a plurality of TRP points at which a beam failure occurred before a sixth time point; where the sixth moment in time is the moment of updating the beam of the first point of TRP. 10. The method according to paragraph 9, which additionally includes: initiating beam failure recovery for a specific TRP upon detection of another second TRP among the plurality of TRPs at which a beam failure occurred after the sixth instant of time. 11. The method according to claim 10, wherein initiating communication restoration after a beam failure for a particular TRP point comprises: triggering link recovery after beam failure based on a scheduling request (SR) on the physical uplink control channel (PUCCH) and/or a medium access control element (MAC CE) on the physical uplink shared channel (PUSCH). 12. The method according to any one of paragraphs 1-11, which also includes: initiating beam failure recovery for a specific TRP or not initiating beam failure recovery for a specific TRP. 13. The method according to any one of paragraphs 1-12, wherein the terminal configured with a plurality of TRPs includes: a terminal configured with a plurality of sets of reference signal resources for detecting a beam failure and/or a terminal configured with a plurality of control resource pool index values. 14. A device for restoring communication after a beam failure, comprising: processor and memory for storing instructions executed by the processor; wherein the processor is configured to perform the method for restoring communication after a beam failure according to any one of claims 1-13. 15. A storage medium on which instructions are stored, wherein when these instructions are executed by the terminal processor, the terminal performs a method for restoring communication after a beam failure according to any of paragraphs 1-13.

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