WO2020192566A1

WO2020192566A1 - Beam failure recovery method and communication apparatus

Info

Publication number: WO2020192566A1
Application number: PCT/CN2020/080328
Authority: WO
Inventors: 管鹏
Original assignee: 华为技术有限公司
Priority date: 2019-03-26
Filing date: 2020-03-20
Publication date: 2020-10-01
Also published as: CN111756458B; CN111756458A

Abstract

The present application provides a beam failure recovery method and a communication apparatus, capable of avoiding cells separately performing beam failure recovery process and achieving the purpose of reducing overhead and delay. The method comprises: if a terminal device detects that beam failure occurs to at least one cell of multiple cells which are associated, determine that beam failure occurs to the multiple cells; and the terminal device determines at least one available beam, the at least one available beam being used for the terminal device to communicate with a network device in each cell of the multiple cells, wherein the at least one available beam belongs to a candidate beam set corresponding to one cell of the multiple cells.

Description

Beam failure recovery method and communication device

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910233027.8, and the application name is "beam failure recovery method and communication device" on March 26, 2019, the entire content of which is incorporated into this application by reference .

Technical field

The present application relates to the field of communication, and more specifically, to a beam failure recovery method and communication device.

Background technique

Factors such as human body occlusion, rotation, etc. will cause the aligned beam to fail. In order to quickly recover from the failure state, a beam failure recovery (BFR) mechanism is designed in the new radio NR. Through the beam failure recovery mechanism, the terminal device can adjust the current failed beam to the available beam according to the beam measurement result, thereby avoiding frequent wireless link failures caused by beam failure.

The current technology specifies the beam failure recovery process of the primary cell (primary cell, PCell), but does not involve the beam failure recovery process of the secondary cell (secondary cell, SCell).

Summary of the invention

The present application provides a beam failure recovery method, which can prevent each cell from performing a beam failure recovery process separately, and can achieve the purpose of reducing overhead and time delay.

In a first aspect, a beam failure recovery method is provided. The method includes: a terminal device detects that a beam failure occurs in at least one cell among a plurality of associated cells; the terminal device determines that a beam failure occurs in the plurality of cells; the terminal device determines at least one Available beams, the at least one available beam is used by the terminal device to communicate with the network device on the multiple cells.

It should be understood that the at least one available beam may be, for example, one available beam or multiple available beams. Wherein, the at least one available beam belongs to a set of candidate beams corresponding to one cell (denoted as: the first cell) of the multiple cells.

Specifically, if the terminal device detects that at least one cell of the multiple cells has a beam failure, it is considered that other cells associated with the at least one cell also have a beam failure. The terminal device can determine at least one available beam, the at least one available beam is the new available beam of each cell in the multiple cells. Since the at least one available beam belongs to the set of candidate beams corresponding to the first cell, then if the If the beam failure recovery procedure is successful, the terminal device can communicate with the network device through the at least one available beam in each of the multiple cells.

Therefore, in the beam failure recovery method provided by the present application, when beam failure occurs in at least one cell, it is considered that beam failure occurs in other cells associated with the cell, and if one of the associated cells fails to recover from beam failure, it is considered All other cells failed to recover from beam failure. Therefore, there is no need to perform a beam failure recovery process for each cell separately, which simplifies the beam failure recovery process of multiple cells, and can achieve the purpose of reducing overhead and time delay.

It should be understood that the at least one available beam may belong to a candidate beam set corresponding to two or more cells in the plurality of cells. For example, one beam may be selected as the available beam from the candidate beam sets corresponding to cell 1 and cell 2 respectively.

Optionally, the multiple cells may all be SCells, or may include PCells.

Optionally, the multiple cells correspond to one cell group; or, the multiple cells use the same beam, for example, the physical downlink control channel (PDCCH) beams of the multiple cells are the same.

It should be understood that the number of the at least one cell may be 1, that is, if the terminal device detects that a beam failure occurs in one of the multiple cells (for example, cell 1), it determines that the multiple cells all have a beam failure. In this scenario, cell 1 may be the cell where beam failure occurs first among the multiple cells. It should also be understood that when a beam failure occurs in cell 1, other cells in the multiple cells may also have beam failures at the same time. Therefore, in this application, if the terminal device detects that one of the multiple cells has a beam failure or at least one cell has a beam failure at the same time, it determines that the multiple cells have a beam failure. The meaning of "simultaneous" here can be extended to "almost simultaneously", in other words, the at least one cell has beam failures within a preset time period, or the time difference between the beam failures of the at least one cell that has beam failures does not exceed The preset duration.

Further, the method may further include: the terminal device communicates with the network device through the at least one available beam on each of the multiple cells.

With reference to the first aspect, in some implementations of the first aspect, after the terminal device determines that the multiple cells have beam failures, the method further includes: the terminal device uses the multiple cells to determine beam failures respectively. Reset or clear the counter of, and/or reset or clear the time windows corresponding to the multiple cells for determining beam failure.

The counter used to determine the beam failure is used to record the number of times that the physical layer of the terminal device reports a beam failure instance (beam failure instance). The time window used to determine the beam failure is used by the terminal device to perform beam failure detection, that is, within the time window, the terminal device performs beam failure detection.

With reference to the first aspect, in some implementations of the first aspect, the terminal device determining at least one available beam includes: configuring a candidate beam set (denoted as: set q ₁ ) in at least one of the multiple cells In the case of, the terminal device determines the at least one available beam.

For example, when the set q ₁ corresponding to the cell grouping is configured, or when the set q ₁ is configured for each cell, the terminal device can autonomously determine the at least one available beam.

Further, when the set q ₁ corresponding to the cell grouping is configured, the terminal device may determine the at least one available beam according to the prior art.

In the case that a set q ₁ is configured for each cell, the terminal device may determine the at least one available beam according to the set q ₁ corresponding to the multiple cells. For example, in the case where the set q _{1 of} the multiple cells are configured differently, the terminal device may perform beam measurement on the reference signal corresponding to the set q ₁ corresponding to each cell, and select the one with the best beam quality or meeting preset conditions. Or beams corresponding to multiple reference signals are used as the at least one available beam. That is, the at least one available beam is a beam that meets a preset condition or has the best beam quality among candidate beam sets corresponding to the multiple cells. In specific implementation, for example, the terminal device can determine the beam with the best beam quality in each cell by performing beam measurement on the reference signal corresponding to the set q ₁ corresponding to each cell, and then determine the beam with the best beam quality in each cell. One or more beams are selected as the at least one available beam among beams.

With reference to the first aspect, in some implementations of the first aspect, the terminal device sends a beam failure recovery request to the network device according to the at least one available beam; the terminal device receives a beam failure recovery request for the beam failure recovery request Request a response, where the beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.

That is, if the terminal device receives the beam failure recovery request response for the first cell, it is considered that the beam failure recovery of the first cell is successful, and it is also considered that the beam failure recovery of other cells is also successful.

With reference to the first aspect, in some implementations of the first aspect, the beam failure recovery request includes at least one of the following information: an identity corresponding to the multiple cells, and an identity of one of the multiple cells , The beam identifier of the PDCCH corresponding to the multiple cells, or the identifier of the cell group corresponding to the multiple cells.

With reference to the first aspect, in some implementations of the first aspect, after the terminal device receives the beam failure recovery request response, the method further includes: the terminal device uses the multiple cells to control beams respectively. The time window for failure recovery is reset or cleared, and/or the counters used for controlling the number of beam failure recovery request retransmissions corresponding to the multiple cells are reset or cleared.

The counter used to control the number of beam failure recovery request retransmissions is used to record the number of times the terminal device sends the beam failure recovery request. The time window used to control the beam failure recovery is used by the terminal device to receive the beam failure recovery request response, that is, within the time window, the terminal device receives the beam failure recovery request response.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes:

The terminal device receives the media access control control element (MAC CE) sent by the network device, and the MAC CE is used to add at least one target beam to the physical downlink control channel PDCCH, In the physical downlink share channel (PDSCH), physical uplink control channel (PUCCH) and/or physical uplink share channel (PUSCH) beam list, the at least one target beam Used for the terminal device to communicate with the network device on the multiple cells.

Optionally, the at least one target beam may be the at least one available beam.

In this application, the MAC CE may be for any one of the multiple cells. When the terminal device receives the above-mentioned MAC CE of the cell, it can be considered that the beam configuration performed by the MAC CE is for the multiple cells, that is, the terminal device believes that the multiple cells all use the target beam to send or receive PDCCH, PDSCH, PUCCH And/or PUSCH.

Based on the above technical solution, the purpose of updating the beam configurations of multiple cells through signaling for one cell can be achieved, so that there is no need to perform beam configuration for each cell, and signaling overhead is saved. On the other hand, in the prior art, radio resource control (RRC) + MAC CE two-level configuration can be used to activate the target beam, and the method of this application introduces a new MAC CE without requiring RRC pre-configuration. The purpose of activating the target beam is achieved, thereby reducing the frequency of RRC reconfiguration and further reducing signaling overhead.

It should be understood that the MAC CE may also be for cell grouping, and the specific format of the MAC CE is not limited in this application.

With reference to the first aspect, in some implementations of the first aspect, before the terminal device receives the MAC CE, the method further includes: the terminal device passes the transmission beam corresponding to the at least one available beam in the multiple cells Sending PUCCH; and/or, the terminal device receives PDCCH and/or PDSCH through the at least one available beam in the multiple cells.

Or, the terminal device communicating with the network device through the at least one available beam on each cell of the multiple cells includes: the terminal device sends the PUCCH through the transmission beam corresponding to the at least one available beam in the multiple cells; And/or, the terminal device receives PDCCH and/or PDSCH through the at least one available beam in the multiple cells.

Based on the above technical solution, the terminal device transmits the PUCCH through the transmission beam corresponding to the at least one available beam on the multiple cells in the beam failure state; and/or, receives the PDCCH and/or PDSCH through the at least one available beam , Can avoid communication interruption caused by beam failure, and ensure the continuity of communication. Among them, the beam failure state refers to the period of time before the beam failure recovery request response is received after the terminal device determines that it has a beam failure in a certain cell and sends a beam failure recovery request, that is, the beam has not recovered successfully. a period of time.

With reference to the first aspect, in some implementations of the first aspect, before the terminal device detects that a beam failure occurs in at least one of the multiple associated cells, the method may further include:

The terminal device receives one (or a set of) or multiple BFR configurations sent by the network device, and the BFR configuration is used for the terminal device to perform beam failure recovery.

In an implementation manner, the network device may configure a set of BFR configurations for the multiple cells. For example, when the multiple cells are grouped into one cell, the network device may configure a set of BFR configuration for the terminal device, that is, the BFR configuration of each cell in a cell group is the same. For another example, the network device may configure a set of BFR configurations for cells that use the same beam (for example, the same PDCCH beam).

In another implementation manner, the network device configures a set of BFR configurations for each of the multiple cells. For any two cells of the plurality of cells, the content included in the BFR configuration corresponding to one cell and the content included in the BFR configuration corresponding to the other cell may be partly or completely the same, or may be different.

Optionally, the BFR configuration in this application may include one or more of the following (1) to (7), and the following is an explanation of each item.

(1) Reference signal resource set used for beam failure detection (denoted as: set q ₀ )

The reference signal corresponding to the set q ₀ may be located on some or all of the multiple cells. For example, in the case of cell grouping, the reference signal corresponding to the set q ₀ may be located on any one or more of the multiple cells. For the case where the cells are not grouped, the reference signal corresponding to the set q _{0 of} a certain cell can be located on this cell, or on other cells, or on this cell and other cells.

(2) Candidate reference signal resource set (ie, set q ₁ )

The set q ₁ may also be referred to as a candidate beam set. Similar to the set q ₁ , the reference signal corresponding to the set q ₁ may be located on some or all of the multiple cells. Further, the reference signal corresponding to the set q _{1 and} the reference signal corresponding to the set q ₀ may be located on the same cell. Of course, the two may also be located on different cells, which is not limited in this application.

(3) A counter (that is, denoted as: the first counter) and/or time window (denoted as: the first time window) for determining beam failure.

Exemplarily, for cell grouping, the network device may configure a first counter and/or a first time window for each cell group, or may configure a first counter and/or a first time window for each cell. For non-cell grouping, the network device can configure a first counter and/or first time window for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application . For example, when the multiple cells use the same beam, such as a PDCCH beam, only one first counter and/or first time window may be configured, and the first counter and/or first time window may be shared by the multiple cells, The configuration of the second counter and/or the second time window described below is similar.

(4) Uplink resources used to send beam failure recovery requests.

In a BFR configuration, the network device can configure one or more uplink resources for sending beam failure recovery requests. Further, if uplink resources for sending beam failure recovery requests are configured on multiple cells, the terminal device can select the uplink resource with the earlier time according to the position of the uplink resources on the at least two cells in the time domain. Send beam failure recovery request. In addition, the terminal device may select an uplink resource on a cell with a smaller or larger identity to send the beam failure recovery request according to the size of the identities of the at least two cells.

Optionally, the uplink resource used to send the beam failure recovery request may be associated with the set q _1. According to one of the uplink resource and the set q ₁ and the association relationship between the two, the other one of the two may be determined By. The association relationship between the uplink resource and the set q ₁ may be configured by a network device or specified by an agreement, which is not limited in this application. It can be understood that in the case where the terminal device knows the association relationship between the uplink resource and the set q ₁ , the network device may only configure one of the uplink resource and the set q ₁ .

(5) A control resource set (CORESET) and/or search space set used to receive a response to a beam failure recovery request.

In a BFR configuration, the network device can be configured with one or more search space sets and/or one or more CORESET. Further, in the case that the network device is configured with multiple CORESETs, the network device may choose to send the beam failure recovery request response on the CORESET earlier in time according to the positions of the multiple CORESETs in the time domain. In addition, the network device may choose to send the beam failure recovery request response on the CORESET corresponding to the cell with the smaller or larger identity according to the size of the identities of the at least two cells.

(6) The time window used to control the overall time of the BFR (ie, the time window used to control the beam failure recovery, denoted as: the second time window).

Optionally, for cell grouping, a second time window may be configured for each cell group, or a second time window may be configured for each cell. For non-cell grouping, a second time window can be configured for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application.

The second time window may be beamFailureRecoveryTimer in the prior art, but the embodiment of the present application does not limit this.

(7) A counter used to control the number of retransmissions of the beam failure recovery request (denoted as: the second counter).

Optionally, for cell grouping, a second counter may be configured for each cell group, or a second counter may be configured for each cell. For non-cell grouping, a second counter can be configured for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application.

The second counter may be the preambleTransMax in the prior art, but the embodiment of the present application does not limit this.

Based on the above-mentioned BFR configuration, the terminal device can perform beam failure detection, newly available beam discovery, and send a beam failure recovery request and receive a beam failure recovery response, that is, the terminal device can perform a beam failure recovery process.

In a second aspect, a beam failure recovery method is provided. The method includes: a network device generates one or more BFR configurations, and the one or more BFR configurations are used for multiple associated cells to perform beam failure recovery; The terminal device sends the one or more BFR configurations.

In the beam failure recovery method provided in this application, the terminal device can perform beam failure recovery according to one or more BFR configurations provided by the network device.

Optionally, the content included in the BFR configuration can be referred to the description of the first aspect, which is not repeated here.

With reference to the second aspect, in some implementations of the second aspect, the method may further include: the network device receives a beam failure recovery request sent by the terminal device, where the beam failure recovery request is used to indicate at least one of the multiple cells A beam failure occurs in a cell; the network device sends a beam failure recovery request response for the beam failure recovery request to the terminal device, and the beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.

Therefore, in the beam failure recovery method provided by the present application, when beam failure occurs in at least one cell, it is considered that beam failure occurs in other cells associated with the cell, and if one of the associated cells fails to recover from beam failure, it is considered All other cells failed to recover from beam failure. Therefore, there is no need to separately perform the beam failure recovery process for each cell, so that the beam failure recovery process of multiple cells is simplified, and the purpose of reducing overhead and time delay can be achieved.

With reference to the second aspect, in some implementations of the second aspect, the method further includes:

The network device sends a media access control control element MAC CE to the terminal device, where the MAC CE is used to add at least one target beam to the beam lists of the PDCCH, PDSCH, PUCCH and/or PUSCH respectively corresponding to the multiple cells, The at least one target beam is used for the terminal device to communicate with the network device in the multiple cells.

With reference to the second aspect, in some implementations of the second aspect, the network device receives the PUCCH in the multiple cells through the receive beam corresponding to the at least one available beam; and/or

The network device transmits the PDCCH and/or PDSCH through the at least one available beam in the multiple cells.

In a third aspect, a communication device is provided, which includes modules or units for executing the method in the first aspect and any one of the possible implementation manners of the first aspect.

In a fourth aspect, a communication device is provided, including a processor. The processor is coupled with the memory and can be used to execute instructions in the memory to implement the foregoing first aspect and the method in any one of the possible implementation manners of the first aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled with the communication interface.

In an implementation manner, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation manner, the communication device is a chip configured in a terminal device. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a fifth aspect, a communication device is provided, which includes modules or units for executing the second aspect and the method in any one of the possible implementation manners of the second aspect.

In a sixth aspect, a communication device is provided, including a processor. The processor is coupled with the memory and can be used to execute instructions in the memory to implement the foregoing second aspect and the method in any one of the possible implementation manners of the second aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled with the communication interface.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver or an input/output interface.

In another implementation manner, the communication device is a chip configured in a network device. When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.

In a seventh aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, so that the processor executes the method in any one of the first aspect to the second aspect and any one of the first aspect to the second aspect.

In a specific implementation process, the foregoing processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and output The circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In an eighth aspect, a processing device is provided, including a processor and a memory. The processor is used to read instructions stored in the memory, receive signals through a receiver, and transmit signals through a transmitter to execute any one of the first aspect to the second aspect and any one of the first aspect to the second aspect. Methods.

Optionally, there are one or more processors and one or more memories.

Optionally, the memory may be integrated with the processor, or the memory and the processor may be provided separately.

In the specific implementation process, the memory can be a non-transitory (non-transitory) memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be set in different On the chip, the embodiment of the present application does not limit the type of memory and the setting mode of the memory and the processor.

It should be understood that the related data interaction process, for example, sending measurement configuration information may be a process of outputting measurement configuration information from the processor, and receiving information may be a process of receiving information by the processor. Specifically, the processed output data may be output to the transmitter, and the input data received by the processor may come from the receiver. Among them, the transmitter and receiver can be collectively referred to as a transceiver.

The processing device in the above eighth aspect may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software When implemented, the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory. The memory may be integrated in the processor, may be located outside the processor, and exist independently.

In a ninth aspect, a computer program product is provided. The computer program product includes: a computer program (also called code, or instruction), which when the computer program is run, causes the computer to execute the first to second aspects above And the method in any one of the possible implementations of the first aspect to the second aspect.

In a tenth aspect, a computer-readable medium is provided, and the computer-readable medium stores a computer program (also called code, or instruction) when it runs on a computer, so that the computer executes the first to second aspects above. Aspect and the method in any possible implementation manner of the first aspect to the second aspect.

In an eleventh aspect, a communication system is provided, including the aforementioned network equipment and terminal equipment.

Description of the drawings

Figure 1 is a schematic diagram of a communication system suitable for this application.

Fig. 2 is an exemplary flow chart of the beam failure recovery method provided by the present application.

Fig. 3 is a schematic structural diagram of a communication device provided by the present application.

Fig. 4 is a schematic structural diagram of a terminal device provided by the present application.

Fig. 5 is a schematic structural diagram of a network device provided by the present application.

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (NR), etc.

The network device in this application is a device deployed in a wireless access network to provide wireless communication functions for terminal devices. Network equipment includes, but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (Node B, NB), Base Station Controller (BSC) , Base transceiver station (Base Transceiver Station, BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), baseband unit (BaseBand Unit, BBU), wireless fidelity (Wireless Fidelity, WIFI) system Access point (Access Point, AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or transmission and reception point (transmission and reception point, TRP), etc., can also be 5G, such as NR , The gNB in the system, or the transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G system, or the network node that constitutes the gNB or transmission point, Such as baseband unit (BBU), or distributed unit (DU), etc. The network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario. The network device can also be a wearable device or a vehicle-mounted device.

In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include a radio unit (RU). CU implements some functions of gNB, DU implements some functions of gNB, for example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions, DU implements wireless link The functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU , Or, sent by DU+CU. It can be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into network equipment in an access network (radio access network, RAN), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.

The terminal equipment in this application may also be referred to as user equipment (UE), terminal, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal , Wireless communication equipment, user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in unmanned driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. The embodiment of this application does not limit the application scenario.

The following first explains some concepts or terms involved in this application.

1. Beam

In some communication systems, such as 5G systems, in order to combat path loss in a high-frequency scenario, two communication devices with communication connections can obtain gain through beamforming (beamforing) respectively. The transmitting end, such as the network device 110, and the receiving end, such as the terminal device 120, can obtain the pairing relationship between the transmitting beam and the receiving beam through beam training.

Among them, the beam can be understood as a spatial filter, spatial parameters, or spatial domain filter. The beam used to transmit a signal can be called a transmission beam (Tx beam), or it can be called a spatial domain transmission filter or a spatial transmission parameter; the beam used to receive a signal can be It is called a receive beam (reception beam, Rx beam), or can be called a spatial domain receive filter (spatial domain receive filter) or a spatial receive parameter (spatial RX parameter).

The transmitting beam may refer to the distribution of signal strength in different directions in space after a signal is transmitted through the antenna, and the receiving beam may refer to the signal strength distribution of the wireless signal received from the antenna in different directions in space.

In addition, the beam may be a wide beam, or a narrow beam, or other types of beams. The beam forming technology may be beamforming technology or other technologies. The beamforming technology may specifically be a digital beamforming technology, an analog beamforming technology, or a hybrid digital/analog beamforming technology, etc.

Optionally, multiple beams with the same or similar communication characteristics are regarded as one beam. One or more antenna ports can be included in a beam for transmitting data channels, control channels, and sounding signals. One or more antenna ports forming a beam can also be regarded as an antenna port set.

In the NR protocol, the beam may be a spatial filter, for example. However, it should be understood that this application does not exclude the possibility of defining other terms to represent the same or similar meanings in future agreements.

The beam pairing relationship, that is, the pairing relationship between the transmitting beam and the receiving beam, that is, the pairing relationship between the spatial transmitting filter and the spatial receiving filter. A larger beamforming gain can be obtained by transmitting signals between the transmitting beam and the receiving beam with a beam pairing relationship.

In an implementation manner, the transmitting end may send the reference signal through beam scanning, and the receiving end may also receive the reference signal through beam scanning. Specifically, the transmitting end can form beams with different directivities in the airspace by beamforming, and can poll on multiple beams with different directivities to transmit the reference signal through beams with different directivities, so that The power of the reference signal transmitted in the direction of the transmission beam can reach the maximum. The receiving end can also form beams with different directivities in the airspace through beamforming, and can poll on multiple beams with different directivities to receive reference signals through beams with different directivities, so that the receiving end can receive The power of the reference signal can reach the maximum in the direction in which the receiving beam points.

By traversing each transmitting beam and receiving beam, the receiving end can perform channel measurement based on the received reference signal, and report the measurement result to the transmitting end through CSI. For example, the receiving end can report a part of the reference signal resource with a larger reference signal receiving power (RSRP) to the sending end, such as reporting the identification of the reference signal resource, so that the sending end can use the channel when transmitting data or signaling. Better quality beam pairing relationship to send and receive signals.

2. Reference signal and reference signal resources

The reference signal can be used for beam measurement or beam quality monitoring.

Beam measurement is to obtain beam quality information by measuring a reference signal. Parameters used to measure beam quality include RSRP and hypothetical block error ratio (hypothetical BLER), but are not limited to this. For example, beam quality can also be determined by reference signal receiving quality (RSRQ), signal-noise ratio (signal-noise ratio, SNR), signal-to-interference plus noise ratio (SINR, or signal-to-interference ratio). Noise ratio) and other parameters.

The reference signal resource can be used to configure the transmission attributes of the reference signal, for example, the position of the time-frequency resource, the port mapping relationship, the power factor, and the scrambling code. For details, refer to the prior art. The transmitting end device may send the reference signal based on the reference signal resource, and the receiving end device may receive the reference signal based on the reference signal resource.

The reference signals involved in the embodiments of the present application may include, for example, channel state information reference signal (CSI-RS), synchronization signal block (synchronization signal block, SSB), and sounding reference signal (sounding reference signal, SRS). . Correspondingly, the reference signal resources may include CSI-RS resources (CSI-RS resources), SSB resources, and SRS resources (SRS resources).

It should be noted that the above-mentioned SSB can also be called synchronization signal/physical broadcast channel block (synchronization signal/physical broadcast channel block, SS/PBCH block), and the corresponding SSB resource can also be called synchronization signal/physical broadcast channel block resource (SS/PBCH block resource), which can be abbreviated as SSB resource. In some cases, SSB can also refer to SSB resources. In the embodiments of the present application, to facilitate distinction and description, unless otherwise specified, the SSB can be regarded as an SS/PBCH block, and the SSB resource can be regarded as an SS/PBCH block resource.

In order to distinguish different reference signal resources, each reference signal resource can correspond to a reference signal resource identifier, for example, CSI-RS resource indicator (CSI-RS resource indicator, CRI), SSB resource indicator (SSB resource indicator, SSBRI) , SRS resource index (SRS resource index, SRI). Among them, the SSB resource identifier may also be referred to as an SSB identifier (SSB index).

It should be understood that the reference signals and corresponding reference signal resources listed above are only exemplary descriptions, and should not constitute any limitation to this application. This application does not exclude the definition of other reference signals in future agreements to achieve the same or similar functions. may.

3. Quasi-co-location (QCL)

The signals corresponding to the antenna ports with the QCL relationship have the same parameters, or the parameters of one antenna port can be used to determine the parameters of the other antenna port that has the QCL relationship with the antenna port, or the two antenna ports have the same parameters , Or, the parameter difference between the two antenna ports is less than a certain threshold. The parameters may include one or more of the following: delay spread, Doppler spread, Doppler shift, average delay, average Gain, spatial reception parameters (spatial Rx parameters). Among them, the spatial reception parameters may include one or more of the following: angle of arrival (angle of arrival, AOA), average AOA, AOA extension, angle of departure (angle of departure, AOD), average departure angle AOD, AOD extension, reception Antenna spatial correlation parameter, transmit antenna spatial correlation parameter, transmit beam, receive beam, and resource identifier.

Wherein, the above-mentioned angle may be decomposition values of different dimensions, or a combination of decomposition values of different dimensions. Antenna ports are antenna ports with different antenna port numbers, and/or antenna ports that have the same antenna port number for information transmission or reception in different time and/or frequency and/or code domain resources, and/or have different Antenna port number The antenna port for information transmission or reception in different time and/or frequency and/or code domain resources. The resource identifier may include: CSI-RS resource identifier, or SRS resource identifier, or SSB resource identifier, or the resource identifier of the preamble sequence transmitted on the Physical Random Access Channel (PRACH), or the demodulation reference signal ( The demodulation reference signal (DMRS) resource identifier is used to indicate the beam on the resource.

In the NR protocol, the above QCL relationship can be divided into the following four types based on different parameters:

Type A (type A): Doppler frequency shift, Doppler spread, average delay, and delay spread;

Type B (type B): Doppler frequency shift, Doppler spread;

Type C (type C): Doppler frequency shift, average delay; and

Type D (type D): Space receiving parameters.

The QCL involved in the embodiment of the present application is a type D QCL. In the following, unless otherwise specified, QCL can be understood as a QCL of type D, that is, a QCL defined based on spatial reception parameters.

When the QCL relationship refers to the QCL relationship of type D: the QCL relationship between the port of the downstream signal and the port of the downstream signal, or the port of the upstream signal and the port of the upstream signal, can be that the two signals have the same AOA or AOD , Used to indicate the same receive beam or transmit beam. For another example, for the QCL relationship between the downlink signal and the uplink signal or between the ports of the uplink signal and the downlink signal, the AOA and AOD of the two signals may have a corresponding relationship, or the AOD and AOA of the two signals may have a corresponding relationship, that is, the beam can be used Reciprocity, the uplink transmission beam is determined according to the downlink reception beam, or the downlink reception beam is determined according to the uplink transmission beam.

The signal transmitted on the port with the QCL relationship may also have a corresponding beam, and the corresponding beam includes at least one of the following: the same receiving beam, the same sending beam, and the sending beam corresponding to the receiving beam (corresponding to the scenario with reciprocity) ), the receiving beam corresponding to the sending beam (corresponding to the scenario with reciprocity).

The signal transmitted on the port with the QCL relationship can also be understood as using the same spatial filter to receive or transmit the signal. The spatial filter may be at least one of the following: precoding, weight of the antenna port, phase deflection of the antenna port, and amplitude gain of the antenna port.

The signal transmitted on the port with the QCL relationship can also be understood as having a corresponding beam pair link (BPL), and the corresponding BPL includes at least one of the following: the same downlink BPL, the same uplink BPL, and corresponding to the downlink BPL The upstream BPL of, and the downstream BPL corresponding to the upstream BPL.

Therefore, the spatial reception parameter (ie, QCL of type D) can be understood as a parameter for indicating the direction information of the reception beam.

4. Transmission configuration indicator (TCI)

TCI can be used to indicate the QCL relationship between two reference signals. Network equipment can configure a TCI state (TCI state) list for terminal equipment through high-level signaling (such as radio resource control (RRC) messages), and can use high-level signaling (such as MAC CE) or physical layer signaling ( For example, DCI activates or indicates one or more of the TCI states. Specifically, the network device can configure the TCI state list for the terminal device through the RRC message, and the terminal device is receiving the physical downlink control channel (PDCCH) from the network device. At this time, one or more of the control channel TCI status list can be activated according to the MAC CE instruction, where the control channel TCI status list is a subset of the above TCI status list; the terminal device can obtain DCI from the PDCCH, and then according to the DCI Indicate the selection of one or more TCI states in the data channel TCI state list, where the data channel TCI state list is a subset of the above TCI state list and is indicated to the terminal device through MAC CE signaling.

The configuration information of a TCI state may include the identification of one or two reference signal resources and the associated QCL type. When the QCL relationship is configured as one of Type A, or B, or C, the terminal device can demodulate the PDCCH or PDSCH according to the indication of the TCI status.

When the QCL relationship is configured as Type D, the terminal device can know which transmit beam is used by the network device to transmit signals, and then can determine which receive beam to use to receive signals according to the beam pairing relationship determined by the channel measurement.

5. Beam failure recovery mechanism

It should be understood that BFR is also called link recovery procedures (link recovery procedures) in the physical layer protocol. In addition, the beam quality in this application is also called radio link quality (radio link quality).

The prior art standardizes the process of beam failure recovery between network equipment and terminal equipment. At the terminal equipment side, it mainly includes the following four parts:

(1) Beam failure detection

The network device can configure reference signal resources for beam failure detection. When the physical layer of the terminal device detects that these reference signal resources meet the beam failure instance condition, that is, the beam quality corresponding to these reference signal resources is worse than one Threshold #1, the beam failure instance indication (beam failure instance indication) is sent to the upper layer of the terminal device. If the beam failure instance indication occurs for N consecutive times, the upper layer of the terminal device announces that the beam failure has occurred, and N is a positive integer. It should be understood that this application does not limit the specific parameters of threshold#1. For example, threshold#1 can be the assumed block error rate. At this time, if the assumed block error rate corresponding to the reference signal resource is greater than or equal to threshold#1, the physical layer of the terminal device fails to transmit the beam to the upper layer of the terminal device Instance instructions. For another example, threshold#1 may be RSRP. At this time, if the RSRP corresponding to the reference signal resource is less than or equal to threshold#1, the physical layer of the terminal device sends a beam failure instance indication to the upper layer of the terminal device. The higher layer may be the MAC layer, but this application does not limit it.

(2) New available beam discovery

The network device may configure the terminal device with reference signal resources used to determine available beams (or called candidate beams or newly available beams), that is, a candidate reference signal resource set or called a candidate beam set. The terminal device detects whether there is a candidate reference signal resource whose beam quality is better than the threshold value threshold#2 in the candidate reference signal resource set, and if so, reports the candidate reference signal resource whose beam quality is better than the threshold value threshold#2 to the network device. It should be understood that this application does not limit the specific parameters of threshold#2. For example, threshold#2 may be an assumed block error rate. In this case, the beam quality is better than threshold#2, which may mean that the assumed block error rate is less than or equal to threshold#2. For another example, threshold#1 can be the reference signal received power (L1-reference signal received power, L1-RSRP) of layer 1. In this case, the beam quality is better than threshold#2, which can mean that L1-RSRP is greater than or equal to threshold#2 .

(3) Sending of beam failure recovery request (BFRQ)

The upper layer of the terminal device determines the available beam (marked as q_new), and informs its associated random access channel (RACH) resource to the physical layer of the terminal device, and the physical layer of the terminal device sends the beam on the RACH resource. The preamble sequence (ie, BFRQ) corresponding to the available beam is used to implicitly inform the network equipment that the terminal device has a beam failure on the serving cell where the RACH resource is located, and that the terminal device has found a new available beam (ie, The beam corresponding to the reference signal resource corresponding to the RACH resource).

(4) Receive the response of the network device to the BFRQ

After sending the beam failure recovery request, the terminal device uses q_new to monitor a dedicated control channel resource set (control resource set, CORESET) and its corresponding search space (search space) in order to obtain the terminal device's response to the BFRQ. The response of the terminal device to the BFRQ is a downlink control channel (physical downlink control channel, PDCCH), that is, if the terminal device receives the PDCCH in the search space corresponding to the dedicated control channel resource set, the beam failure recovery is successful.

In order to facilitate the understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail with reference to FIG. 1. Figure 1 shows a schematic diagram of a communication system suitable for the present application. As shown in FIG. 1, the communication system 100 may include at least one network device, such as the network device 110 shown in FIG. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in FIG. 1. The terminal device 120 and the network device 110 may communicate in a manner of carrier aggregation (CA). For example, the network device 110 communicates with the terminal device 120 through aggregate component carriers (CC) CC1, CC2, and CC3. Among them, CC1 corresponds to cell 1, CC2 corresponds to cell 2, and CC3 corresponds to cell 3, cell 1 may be a primary cell (PCell), and cell 2 and cell 3 may be secondary cells (SCell).

It should be understood that the network device 110 may also aggregate more cells, and the three cells shown in FIG. 1 are only exemplary. It should also be understood that the cell and component carrier in this application represent the same concept, and the two can be used interchangeably.

The current technology specifies the beam failure recovery process of the primary cell (for example, cell 1 shown in Figure 1). Through the beam failure recovery process, the primary cell can adjust the current failed beam to the available beam, thereby avoiding frequent wireless links caused by beam failure The road fails. However, how the secondary cell performs beam failure recovery is not covered in the prior art.

In view of this, the present application provides a beam failure recovery method. When a beam failure occurs in at least one cell, it is considered that other cells associated with the at least one cell have beam failures, and if at least one of these associated cells If the beam fails to recover successfully, it is considered that other cells have failed to recover successfully. Therefore, there is no need to separately perform the beam failure recovery process for each cell, so that the beam failure recovery process of multiple cells is simplified, and the purpose of reducing overhead and time delay can be achieved.

The solution of this application can be applied to a scenario where multiple associated cells use the same set of beams. That is, no matter which cell they work in, the beams of the network equipment and terminal equipment have only a few fixed beams. For example, the network device has only fixed 64 beams to receive/send signals, and the terminal device has only fixed 8 beam directions to receive/send signals.

Hereinafter, the embodiments of the present application will be described in detail with reference to the system architecture diagram shown in FIG. 1 and the flowchart shown in FIG. 2.

Fig. 2 is a schematic flowchart of a beam failure recovery method provided according to the present application. The method may include S210 to S270, and each step is described in detail below.

S210: The network device sends the BFR configuration of multiple associated cells to the terminal device. Correspondingly, the terminal device receives the BFR configuration sent by the network device.

Wherein, the multiple cells may include or may not include the primary cell, that is, all of them are secondary cells, but this application does not limit this.

In the first implementation manner, the multiple cells may correspond to one cell group. That is, the network device can group cells, and the multiple cells are grouped into one group.

Exemplarily, a master cell group (MCG) or a secondary cell group (SCG) in the prior art may be reused to group cells, that is, a cell group may be one MCG or SCG. It should be understood that other methods may be used to group cells, for example, cells using the same beam may be grouped into a group, and the present application does not limit the manner of cell grouping. The meaning of "cells using the same beam" will be described in detail below, and will not be described here.

Further, a cell group can uniquely correspond to a group identifier. The group ID can be configured by the network device, and the terminal device can determine which cells belong to a cell group according to the group ID.

In the second implementation manner, the multiple cells may also be cells using the same beam.

Wherein, the use of the same beam in the multiple cells may mean any of the following:

(1) The PDCCH beams of the multiple cells are the same.

Wherein, "PDCCH beams are the same" can mean any of the following:

A. The CORESET with the same index (or identifier) in the CORESET corresponding to the multiple cells corresponds to the same activated TCI.

For example, suppose the multiple cells are cell 1, cell 2, and cell 3. If the CORESET corresponding to cell 1 is CORESET{1, 2, 3}, and the activated TCI corresponding to CORESET{1, 2, 3} is TCI{ 1,2,3}, then the activated TCI corresponding to CORESET{1,2,3} corresponding to cell 2 and cell 3 are also TCI{1,2,3} respectively.

B. The CORESET with the same index among the CORESETs corresponding to the multiple cells corresponds to the same configuration TCI.

Similarly, suppose the multiple cells are cell 1, cell 2, and cell 3. If the CORESET corresponding to cell 1 is CORESET{1, 2, 3}, and the configuration TCI corresponding to CORESET{1, 2, 3} is TCI respectively {1,2;3,4;5,6}, that is, the configuration TCI corresponding to CORESET1 is TCI1 and TCI2, the configuration TCI corresponding to CORESET2 is TCI3 and TCI4, and the configuration TCI corresponding to CORESET3 is TCI5 and TCI6, then cell 2 and The configuration TCI corresponding to the CORESET {1, 2, 3} corresponding to the cell 3 is also TCI {1,2; 3, 4; 5, 6} respectively.

Regarding the meaning of the activated TCI corresponding to CORESET and the configured TCI corresponding to CORESET, and the relationship between the activated TCI and the configured TCI, please refer to the prior art for details, and will not be repeated here.

C. For any two cells in the plurality of cells, the activated TCI set corresponding to all CORESETs corresponding to one cell is the same as the activated TCI set corresponding to all CORESETs corresponding to the other cell.

Similarly, assuming that the multiple cells are cell 1, cell 2, and cell 3, if all the CORESETs corresponding to cell 1 are CORESET {1, 2, 3}, and any CORESET in CORESET {1, 2, 3} corresponds to All activated TCIs belong to TCI{1,2,3}, then the activated TCI corresponding to any CORESET in all CORESETs corresponding to cell 2 belongs to TCI{1,2,3}, and all CORESETs corresponding to cell 3 The activated TCI corresponding to any CORESET also belongs to TCI{1,2,3}.

D. For any two cells in the multiple cells, the configured TCI set corresponding to all CORESETs corresponding to one cell is the same as the configured TCI set corresponding to all CORESETs corresponding to the other cell.

Similarly, assuming that the multiple cells are cell 1, cell 2, and cell 3, if all the CORESETs corresponding to cell 1 are CORESET {1, 2, 3}, and any CORESET in CORESET {1, 2, 3} corresponds to All configuration TCIs belong to TCI{1,2,3,4,5,6}, then the activated TCI corresponding to any CORESET of all CORESETs corresponding to cell 2 belongs to TCI{1,2,3,4,5 ,6}, the activated TCI corresponding to any CORESET in all the CORESETs corresponding to cell 3 also belongs to TCI{1,2,3,4,5,6}.

(2) The TCI list configuration of any two cells in the multiple cells is the same.

(3) The multiple TCI list configurations corresponding to the multiple cells have a non-empty intersection. Wherein, the multiple cells have a one-to-one correspondence with the multiple TCI list configurations.

Similarly, assuming that the multiple cells are cell 1, cell 2, and cell 3, and the TCI list configuration corresponding to these three cells is the TCI list configuration {1,2,3}, then the TCI list configuration {1,2 ,3} can be exactly the same; or, two of the TCI list configurations are a subset of another TCI list configuration, for example, TCI list configurations 1 and 2 are a subset of 3; or, one of the TCI list configurations is the other two A subset of the TCI list configuration, for example, TCI list configuration 1 is a subset of 2 and 3.

In addition, the multiple cells may also be associated in other ways, which is not limited in this application. For example, multiple cells in a band are associated cells. That is, the multiple cells in this application may belong to the same frequency band.

The implementation of the BFR configuration will be described below in conjunction with the implementation of cell association described above.

method one

The network equipment can allocate a set of BFR configurations to the multiple cells.

For example, the network device may configure a set of BFR configurations for each cell group, that is, the BFR configuration of each cell in a cell group is the same. For example, multiple high-frequency cells in one SCG can use the same BFR configuration. For another example, a network device can configure a set of BFR configurations for cells that use the same beam.

Way two

The network device configures a set of BFR configurations for each of the multiple cells. For any two cells of the plurality of cells, the content included in the BFR configuration corresponding to one cell and the content included in the BFR configuration corresponding to the other cell may be partly or completely the same, or may be different.

Wherein, the BFR configuration in this application may include one or more of the following (1) to (7), and the following is an explanation of each item.

Exemplarily, for the above method 1, only one set q ₀ may be configured. Regarding the second method above, a set q ₀ may be configured for each cell, where the set q ₀ corresponding to each cell may be the same or different.

The reference signal corresponding to the set q ₀ may be located on some or all of the multiple cells. For example, for the foregoing implementation manner 1, the reference signal corresponding to the set q ₀ may be located on any one or more of the multiple cells. For the second implementation manner described above, the reference signal corresponding to the set q _{0 of} a certain cell may be located on this cell, or on another cell, or on this cell and other cells.

For any cell, the terminal device can determine whether a beam failure occurs in the cell by detecting the set q ₀ corresponding to the cell. For example, if the terminal device detects that the beam quality corresponding to the set q ₀ corresponding to cell 1 of the multiple cells is worse than a preset threshold, such as threshold#1, it sends a beam failure instance indication to the upper layer of the terminal device. If the beam failure instance indication occurs consecutively preset times (for example, N times), the terminal device determines that the beam failure occurs in cell 1, and N is a positive integer.

It should be understood that the reference signal described in this application being located in a certain cell means that the frequency domain resource that carries the reference signal belongs to the frequency band where the cell is located.

(2) Candidate reference signal resource set (denoted as: set q ₁ )

The set q ₁ may also be referred to as a candidate beam set, which is used by the terminal device to determine an available beam (or the new available beam described in the foregoing), that is, the available beam determined by the terminal device belongs to the set q ₁ .

It can be understood that, for the above method 1, only one set q ₁ may be configured. Regarding the second approach above, a set q ₁ may be configured for each cell, where the set q ₁ corresponding to each cell may be the same or different.

Similar to the set q ₁ , the reference signal corresponding to the set q ₁ may be located on some or all of the multiple cells. Further, the reference signal corresponding to the set q _{1 and} the reference signal corresponding to the set q ₀ may be located on the same cell. Of course, the two may also be located on different cells, which is not limited in this application.

(3) A counter (denoted as: the first counter) and/or time window (denoted as: the first time window) used to determine beam failure.

The first counter: records the number of reported beam failure instance indications, which may be the BFI_COUNTER in the prior art, but the embodiment of the present application does not limit this.

Specifically, if the physical layer of the terminal device detects that the beam quality corresponding to the reference signal resource in the set q ₀ is worse than a preset threshold, such as threshold#1, the beam failure instance indication is reported. And every time a beam failure instance indication is reported, the first counter is incremented by 1, and when the first counter reaches a preset number of times, such as N, it is determined that a beam failure has occurred. In short, if the reference signal quality is lower than the threshold event is detected and reported for N consecutive times, it is determined that the beam has failed. It should be understood that the event that the reference signal quality is lower than the threshold means that the beam quality corresponding to the reference signal resource in the set q ₀ is worse than the preset threshold.

The first time window: the time interval for each determination and reporting of the reference signal quality lower than the threshold event.

Specifically, the terminal device may perform beam failure detection in the first time window, and if it detects and reports the reference signal quality lower than the threshold event for N consecutive times in the first time window, it is determined that the beam fails. It should be understood that the reporting here means that the physical layer of the terminal device reports to the higher layer of the terminal device.

Those skilled in the art can understand that if the terminal device detects that a beam failure occurs in a cell, the terminal device can clear or reset the first counter and/or the first time window of the cell.

Exemplarily, with respect to the first approach above, a first counter and/or a first time window may be configured for each cell group, or a first counter and/or a first time window may be configured for each cell. Regarding the second method above, a first counter and/or a first time window can be configured for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application.

(4) Uplink resources used to send beam failure recovery requests.

Wherein, the uplink resources include time domain resources and frequency domain resources. It can be understood that the time domain resource indicates the position of the uplink resource in the time domain, and the frequency domain resource indicates the position of the uplink resource in the frequency domain. In addition, the uplink resource may also include resources such as code domain and/or space domain.

Optionally, the network device may configure one or more uplink resources for sending the beam failure recovery request. For example, the network device may configure the uplink resource on one of the multiple cells, that is, the uplink resource used for sending the beam failure recovery request may be located on one of the multiple cells. For another example, the network device may also configure the uplink resources on two or more cells among the multiple cells, that is, the uplink resources used for sending the beam failure recovery request are located on at least two cells.

Further, if uplink resources for sending beam failure recovery requests are configured on multiple cells, the terminal device can select the uplink resource with the earlier time according to the position of the uplink resources on the at least two cells in the time domain. Send beam failure recovery request. In addition, the terminal device may select an uplink resource on a cell with a smaller or larger identity to send the beam failure recovery request according to the size of the identities of the at least two cells.

It should be understood that, in the meaning of an uplink resource on a certain cell, the frequency domain position of the uplink resource belongs to the frequency band corresponding to the cell.

(5) CORESET and/or search space collection for receiving beam failure recovery request response.

For example, in the LTE system, the network device may only configure one search space set, which corresponds to one of the multiple cells, that is, the frequency domain position of the search space included in the search space set belongs to the cell The corresponding frequency band. In addition, the network device may also configure at least two search space sets, and the at least two search space sets have a one-to-one correspondence with at least two of the multiple cells, that is, one search space set corresponds to one cell. Among them, a search space set may include one or more search spaces.

For another example, in the NR system, one CORESET can correspond to one search space set or multiple search space sets. The network device can configure only one CORESET or its corresponding search space set, and the terminal device can determine the corresponding search space set or CORESET according to the corresponding relationship between the CORESET and the search space set, and the CORESET corresponds to one of the multiple cells , That is, the frequency domain position of the CORESET belongs to the frequency band corresponding to the cell. In addition, the network device may also configure at least two CORESETs or search space sets corresponding to each CORESET respectively. The at least two CORESETs correspond to at least two of the multiple cells in a one-to-one correspondence, that is, one CORESET corresponds to one cell.

Further, in the case that the network device is configured with multiple CORESETs, the network device may choose to send the beam failure recovery request response on the CORESET earlier in time according to the positions of the multiple CORESETs in the time domain. In addition, the network device may choose to send the beam failure recovery request response on the CORESET corresponding to the cell with the smaller or larger identity according to the size of the identities of the at least two cells.

(6) The time window used to control the overall time of the BFR (denoted as: the second time window).

For a cell, the terminal device opens the second time window when determining that a beam failure occurs, and if the beam failure recovery request response is not received when the second time window expires, it is determined that the beam failure recovery is not successful. Further, the terminal device may no longer use the method of the present application for beam failure recovery. For example, the terminal device may use other methods such as contention-based random access for beam failure recovery.

Optionally, in this application, with respect to the above-mentioned manner 1, a second time window may be configured for each cell group, or a second time window may be configured for each cell. Regarding the second method above, a second time window can be configured for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application.

Those skilled in the art can understand that if the terminal device receives the beam failure recovery request response within the second time window, the terminal device can clear or reset the corresponding second time window.

For a cell, after determining that a beam failure occurs, the terminal device sends a beam failure recovery request to the network device. If the beam failure recovery request response is not received within a preset time, the beam failure recovery request is sent again. Each time a beam failure recovery request is sent, the second counter is incremented by 1. If the terminal device has not received the beam failure recovery request response when the second counter reaches the preset maximum value, the beam failure recovery request is not retransmitted.

Optionally, in this application, with respect to the above-mentioned method 1, a second counter may be configured for each cell group, or a second counter may be configured for each cell. Regarding the second method above, a second counter can be configured for each cell, but this application does not limit the above configuration methods, and other reasonable configuration methods should also fall within the protection scope of this application.

Those skilled in the art can understand that if the terminal device receives a beam failure recovery request response when the second counter does not overflow or does not reach the preset maximum value, the terminal device can clear or reset the corresponding second counter.

S220: The terminal device detects that at least one of the multiple cells has a beam failure.

S230: The terminal device determines that beam failure occurs in the multiple cells.

Specifically, for any cell, the terminal device can determine (or detect) whether beam failure occurs in the cell by detecting the set q ₀ corresponding to the cell. For example, for cell 1 of the multiple cells, if the terminal device detects that the beam quality corresponding to the set q ₀ corresponding to cell 1 is worse than a preset threshold, such as threshold#1, it sends a beam failure instance indication to the upper layer of the terminal device . If the beam failure instance indication occurs for a preset number of consecutive times, for example, the first counter reaches the maximum value, the terminal device may determine that the beam failure occurs in cell 1. For another example, for cell 1, if the physical layer of the terminal device reports an event that the reference signal quality is lower than the threshold within the corresponding first time window, the upper layer of the terminal device can determine that the beam fails in cell 1. If the terminal device detects that the beam failure occurs in cell 1, it is considered that other cells in the multiple cells also have beam failure, that is, the multiple cells all have beam failure.

It should be understood that the number of the at least one cell may be 1, that is, if the terminal device detects that a beam failure occurs in one of the multiple cells (for example, cell 1), it determines that the multiple cells all have a beam failure. In this scenario, cell 1 may be the cell where beam failure occurs first among the multiple cells. It should also be understood that when a beam failure occurs in cell 1, other cells in the multiple cells may also have beam failures at the same time. For example, in the case where the BFR configuration adopts the above method 1, the multiple cells may have beam failures at the same time.

Therefore, in this application, if the terminal device detects that one of the multiple cells has a beam failure or at least one cell has a beam failure at the same time, it determines that the multiple cells have a beam failure. The meaning of "simultaneous" here can be extended to "almost simultaneously", in other words, the at least one cell has beam failures within a preset time period, or the time difference between the beam failures of the at least one cell that has beam failures does not exceed The preset duration.

It should be noted that if the multiple cells are managed by different MAC entities of the terminal device, interaction between MAC entities may also be required. For example, after the terminal device determines that cell 1 of the multiple cells has a beam failure, the MAC entity that manages cell 1 can notify the MAC entity that manages other cells of the multiple cells (for example, cell 2) that the beam fails in cell 1 . According to the notification from the MAC entity of cell 1, the MAC entity of cell 2 considers that cell 1 also has a beam failure. At this time, the MAC entity of cell 2 clears or resets the first counter and/or the first counter of cell 2 according to the notification of the MAC entity of cell 1.

Optionally, as an embodiment of the present application, the method may further include:

S240: The terminal device determines at least one available beam, so that each cell of the multiple cells communicates with the network device through the at least one available beam. In other words, the at least one available beam is used by the terminal device to communicate with the network device on each of the multiple cells.

S240 may be performed when the network device configures the set q ₁ for the terminal device, and in this case, the at least one available beam may be determined by the terminal device itself.

Wherein, the at least one available beam belongs to a set q ₁ corresponding to one cell (denoted as: the first cell) of the multiple cells. That is, the at least one available beam is determined from the set q ₁ corresponding to the first cell. It should be understood that the set q ₁ corresponding to the first cell may be configured by the network device for the cell group to which the first cell belongs, or may be dedicated to the first cell. The first cell may be at least one cell where the beam occurs, or it may be the at least one cell, which is not limited in this application.

Exemplarily, in S240, the terminal device may determine the at least one available beam according to the set q ₁ respectively corresponding to the multiple cells.

For example, in the case where the set q _{1 of} the multiple cells are configured differently, the terminal device may perform beam measurement on the reference signal corresponding to the set q ₁ corresponding to each cell, and select the one with the best beam quality or meeting preset conditions. Or beams corresponding to multiple reference signals are used as the at least one available beam. In specific implementation, for example, the terminal device can determine the beam with the best beam quality in each cell by performing beam measurement on the reference signal corresponding to the set q ₁ corresponding to each cell, and then determine the beam with the best beam quality in each cell. One or more beams are selected from the beams as the at least one available beam. In this application, the one or more reference signals with the best beam quality or meeting preset conditions may belong to the set q ₁ corresponding to the first cell.

Exemplarily, in S240, the terminal device may determine the at least one available beam from the set q ₁ corresponding to any cell (for example, the first cell) of the multiple cells.

It should be understood that there is no sequence in time between S240 and S220 and S230.

Specifically, the terminal device determines the at least one available beam, and the at least one available beam is the new available beam of each cell in the multiple cells. Since the at least one available beam belongs to the candidate beam set corresponding to the first cell, then if the first available beam is If the beam failure recovery procedure of a cell succeeds, the terminal device can communicate with the network device through the at least one available beam in each cell of the multiple cells.

Therefore, in the beam failure recovery method provided by the present application, when beam failure occurs in at least one cell, it is considered that beam failure occurs in other cells associated with the cell, and if at least one of the associated cells fails to recover from beam failure, then It is considered that other cells have failed to recover from beam failure. Therefore, there is no need to separately perform the beam failure recovery process for each cell, so that the beam failure recovery process of multiple cells is simplified, and the purpose of reducing overhead and time delay can be achieved.

It should be understood that the at least one available beam may belong to a candidate beam set corresponding to two or more cells in the plurality of cells. For example, one beam may be selected as the available beam from the candidate beam sets corresponding to cell 1 and the campus respectively.

Further, the method may also include:

S250: The terminal device sends a beam failure recovery request to the network device according to the at least one available beam.

Specifically, after determining the at least one available beam and beam failures occur in the multiple cells, the terminal device may determine the transmission beam failure recovery based on the association relationship between the set q ₁ and the uplink resource used to send the beam failure recovery request The requested uplink resource can then send a beam failure recovery request on the uplink resource. Or, in the case that there is no correlation between the set q ₁ and the uplink resource used to send the beam failure recovery request, the terminal device can directly select the uplink resource for sending the beam failure recovery request, and send the beam failure recovery request on the uplink resource request. For example, the terminal device may generate a beam failure recovery request on the only uplink resource used to generate a beam failure recovery request. For another example, the terminal device can select multiple uplink resources that are used to generate the beam failure recovery request, which is earlier in time, so that the beam failure recovery request can be sent as soon as possible to realize the beam failure recovery as soon as possible.

S260: The terminal device receives a beam failure recovery request response for the beam failure recovery request sent by the network device. The beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.

After receiving the beam failure recovery request, the network device may send a beam failure recovery request response on the corresponding CORESET and/or search space set. Correspondingly, the terminal device detects the beam failure recovery request response on the corresponding CORESET and/or search space set, and if the beam failure recovery request response is received, the beam failure recovery request response of the first cell is successfully recovered, and the terminal device confirms the multiple The beams of other cells in the cell failed to recover successfully.

It should be noted that if multiple cells are managed by different MAC entities of the terminal device, interaction between MAC entities may also be required. For example, if the terminal device determines that the beam of cell 1 fails to recover successfully, the MAC entity managing cell 1 notifies the MAC entity of managing cell 2 that the beam of cell 1 fails to recover successfully. According to the notification of cell 1, the MAC entity of cell 2 considers that the beam of cell 2 has failed to recover successfully. Further, the MAC entity of cell 2 may clear or reset the second time window and/or the second counter of cell 2 to zero.

Optionally, the beam failure recovery request includes any one of the following information: the identity corresponding to the multiple cells, the identity of one of the multiple cells, the beam identity of the PDCCH corresponding to the multiple cells, Or the identity of the cell group corresponding to multiple cells.

Specifically, in the case of grouping cells, the network device may determine the cell group or cell where the beam failure occurs according to the identities corresponding to the multiple cells or the identities of the cell group corresponding to the multiple cells. In the case that the PDCCHs corresponding to the multiple cells are the same, the network device can determine the occurrence of the occurrence based on the identity corresponding to the multiple cells, the identity of one of the multiple cells, or the beam identity of the PDCCH corresponding to the multiple cells. The multiple cells where the beam failed.

Optionally, as another embodiment of the present application, S240 may be executed after S250.

For example, when the network device does not configure the set q ₁ for the terminal device, the terminal device cannot determine the at least one available beam by itself. In this case, at the same time or after determining that the multiple cells have beams, the terminal device may send a beam failure recovery request to the network device to notify the network device that the multiple cells have beam failures. After the network device receives the beam failure recovery request, the network device may configure at least one beam for a cell in the multiple cells, such as the first cell, and other cells in the multiple cells also use the at least one beam as Available beams; or, the network device may configure at least one beam for each cell group as an available beam for each cell of the cell group. Correspondingly, according to the configuration of the network device, the terminal device can determine the at least one available beam.

Optionally, as another embodiment of the present application, S250 may be executed instead of S240.

For example, after the network device receives the beam failure recovery request, it can turn off the transmission of multiple cells, that is, the terminal device does not expect to communicate with the network device on the multiple cells.

For another example, after the network device receives the beam failure recovery request, it can trigger beam training to find available beams.

Optionally, as an embodiment of the present application, before the network device performs beam reconfiguration, for example, before the terminal device receives the MAC CE in S280 below, the method may further include:

S270: The terminal device communicates with the network device through the at least one available beam on the multiple cells.

Specifically, the terminal device may communicate with the network device through the at least one available beam or the receiving beam corresponding to the at least one available beam in the beam failure state. For example, before the network device performs beam reconfiguration, the terminal device transmits the PUCCH on the multiple cells through the transmission beam corresponding to the at least one available beam; and/or, the terminal device transmits the PUCCH on the multiple cells through the at least one available beam. The beam can be used to receive PDCCH and/or PDSCH. Among them, the beam failure state refers to the period of time before the beam failure recovery request response is received after the terminal device determines that it has a beam failure in a certain cell and sends a beam failure recovery request, that is, the beam has not recovered successfully. a period of time.

The terminal device uses the at least one available beam to communicate with the network device in the beam failure state, which can avoid communication interruption caused by the beam failure and ensure the continuity of communication.

Further, the method may also include:

S280: The network device sends the MAC CE to the terminal device. Correspondingly, the terminal device receives the MAC CE sent by the network device.

Wherein, the MAC CE is used to add at least one target beam to the beam lists of the PDCCH, PDSCH, PUCCH and/or PUSCH corresponding to the multiple cells respectively, and the target beam is used by the terminal device to perform in the multiple cells and the network device. Communication.

Specifically, after a beam failure occurs, the network device can perform beam reconfiguration on the cell, and the network device can configure at least one available beam reported by the terminal device to the terminal device, or can configure other beams.

Based on the above technical solution, the purpose of updating the beam configurations of multiple cells through signaling for one cell can be achieved, so that there is no need to perform beam configuration for each cell, and signaling overhead is saved. On the other hand, the prior art adopts RRC+MAC CE two-level configuration to activate the target beam, and the method of this application introduces a new MAC CE, which can achieve the purpose of activating the target beam without the need for RRC pre-configuration. Reduce the frequency of RRC reconfiguration and further reduce signaling overhead.

Optionally, the MAC-CE signaling includes one or more of the following: identification of at least one target beam, cell identification, cell grouping identification, bandwidth part (BWP) identification, PDCCH resource identification ( That is, CORESET ID), PUCCH resource ID, PUCCH resource collection ID, CSI-RS resource ID, CSI-RS resource collection ID, CSI-RS resource setting ID, SRS resource ID, SRS resource collection ID, SRS group ID.

For example, when MAC-CE signaling is used to add a new beam configuration to multiple cells as PDCCH beams, the MAC-CE needs to include: at least one target beam identifier, in {cell ID/cell group ID/BWP ID} One or more of the PDCCH resource identifiers (ie CORESET identifiers).

For example, when MAC-CE signaling is used to add a new beam configuration to multiple cells as PUCCH beams, the MAC-CE needs to include: at least one target beam ID, in {cell ID/cell group ID/BWP ID} One or more of the PUCCH resource identifiers.

Optionally, the foregoing MAC-CE signaling may be identified by the LCID (logic channel) of the MAC-CE.

It should be understood that adding the target beam to the beam list of the PDCCH and/or PDSCH can be achieved by adding the TCI corresponding to the target beam to the beam list of the PDCCH and/or PDSCH, but this application does not limit this. It should also be understood that adding the target beam to the beam list of PUCCH and/or PUSCH can be implemented by adding the spatial relation corresponding to the target beam to the beam list of PUCCH and/or PUSCH, but this application Not limited.

Fig. 3 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown in FIG. 3, the communication device 300 may include a processing unit 310. Optionally, the communication device 300 may further include a transceiver unit 320.

In a possible design, the communication device 300 may correspond to the terminal device in the above method embodiment, for example, it may be a terminal device or a chip configured in the terminal device. When the communication device is a terminal device, the processing unit may be a processor, and the transceiver unit may be a transceiver. The communication device may further include a storage unit, and the storage unit may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the communication device executes the foregoing method. When the communication device is a chip in a terminal device, the processing unit may be a processor, and the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to enable the communication The device executes the operations performed by the terminal device in the above method 2, and the storage unit can be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit located outside the chip in the communication device ( For example, read only memory, random access memory, etc.)

In an implementation manner, the communication device 300 may correspond to the terminal device in the method according to the embodiment of the present application, and the communication device 300 may include a unit for executing the method executed by the terminal device in the method in FIG. 2. In addition, each unit in the communication device and other operations and/or functions described above are intended to implement the corresponding process of the method in FIG. 2. Specifically, the processing unit 310 may be used to perform S220 to S240 in the method shown in FIG. 2, and the transceiving unit 320 may be used to perform S210 and S250 to S280 in the method shown in FIG. 2.

Specifically, the processing unit 310 is configured to detect that a beam failure occurs in at least one of the multiple associated cells; determine that a beam failure occurs in the multiple cells; the processing unit is also configured to determine at least one available beam, which is at least One available beam is used by the terminal device to communicate with the network device on each of the multiple cells, where the at least one available beam belongs to a set of candidate beams corresponding to one of the multiple cells.

Optionally, the processing unit 310 is specifically configured to determine the at least one available beam when at least one of the multiple cells is configured with a candidate beam set.

Optionally, the transceiving unit 320 is configured to: send a beam failure recovery request to the network device according to the at least one available beam; receive a beam failure recovery request response for the beam failure recovery request, and the beam fails The recovery request response is used to indicate that the beams of the multiple cells have failed to recover successfully.

Optionally, the transceiving unit 320 is further configured to: receive a media access control control element MAC CE sent by the network device, where the MAC CE is used to add at least one target beam to the physical downlink corresponding to the multiple cells. In the beam list of the control channel PDCCH, the physical downlink shared channel PDSCH, the physical uplink control channel PUCCH and/or the physical uplink shared channel PUSCH, the at least one target beam is used by the device to communicate with the network on the multiple cells The device communicates.

Optionally, the transceiving unit 320 is further configured to: transmit the PUCCH through the transmission beam corresponding to the at least one available beam in the multiple cells; and/or, through the at least one available beam in the multiple cells Receive PDCCH and/or PDSCH.

Optionally, the processing unit 310 is further configured to: reset or clear the time windows for the control beam failure recovery corresponding to the multiple cells, and/or, respectively correspond to the multiple cells Reset or clear the counter used to control the number of beam failure recovery request retransmissions.

Optionally, the processing unit 310 is further configured to: reset or clear counters corresponding to the multiple cells for determining beam failure, and/or use the multiple cells to correspond to each other. The time window for determining beam failure is reset or cleared.

In another possible design, the communication device 800 may correspond to the network device in the above method embodiment, for example, it may be a network device or a chip configured in the network device. When the communication device is a network device, the processing unit may be a processor, and the transceiver unit may be a transceiver. The communication device may further include a storage unit, and the storage unit may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit, so that the communication device executes the foregoing method. When the communication device is a chip in a network device, the processing unit may be a processor, and the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to enable the The communication device executes the operations performed by the network device in the above method, and the storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit located outside the chip in the communication device ( For example, read-only memory, random access memory, etc.).

In an implementation manner, the communication device 300 may correspond to the network device in the method according to the embodiment of the present application, and the communication device 300 may include a unit for executing the method executed by the network device in FIG. 2. In addition, each unit in the communication device 300 and other operations and/or functions described above are intended to implement the corresponding process of the method 200 in FIG. 2. Specifically, when the communication device 300 is used to execute the method 200 in FIG. 2, the transceiving unit 320 may be used to execute S210 and S250 to S280 in the method in FIG.

Specifically, the processing unit 310 may be used to generate one or more BFR configurations, and the one or more BFR configurations are used for beam failure recovery in multiple associated cells; the transceiver unit 320 may be used to send the one or more BFR configurations to the terminal device. BFR configuration.

Optionally, the transceiver unit 320 is further configured to receive a beam failure recovery request sent by the terminal device, where the beam failure recovery request is used to indicate that at least one cell of the multiple cells has a beam failure; and send to the terminal device a beam failure recovery request; A beam failure recovery request response of the failed recovery request, where the beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.

Optionally, the transceiving unit 320 is further configured to generate a medium access control control element MAC CE to the terminal device, and the MAC CE is used to add at least one target beam to the PDCCH, PDSCH, PUCCH, and PDCCH corresponding to the multiple cells. /Or in the PUSCH beam list, the at least one target beam is used for the terminal device to communicate with the network device in the multiple cells.

Optionally, the transceiving unit 320 is further configured to receive PUCCH in the multiple cells through the receiving beam corresponding to the at least one available beam; and/or, the network device sends the PDCCH and the PDCCH through the at least one available beam in the multiple cells / Or PDSCH.

The network equipment in each of the above device embodiments corresponds to the network equipment or terminal equipment in the terminal equipment and method embodiments, and the corresponding modules or units execute the corresponding steps, for example, the transceiver unit (transceiver) method executes the method. And/or the steps of receiving, other steps except sending and receiving may be executed by the processing unit (processor). For the functions of specific units, refer to the corresponding method embodiments. The transceiving unit may include a transmitting unit and/or a receiving unit, the transceiver may include a transmitter and/or a receiver, which respectively implement the transceiving function; there may be one or more processors.

It should be understood that the division of each unit described above is only a functional division, and there may be other division methods in actual implementation.

The above-mentioned terminal device or network device may be a chip, and the processing unit may be realized by hardware or software. When realized by hardware, the processing unit may be a logic circuit, integrated circuit, etc.; when realized by software, The processing unit may be a general-purpose processor, which is implemented by reading software codes stored in a storage unit. The storage unit may be integrated in the processor, or may be located outside the processor and exist independently.

FIG. 4 is a schematic structural diagram of a terminal device 10 provided by this application. For ease of description, FIG. 4 only shows the main components of the terminal device. As shown in FIG. 4, the terminal device 10 includes a processor, a memory, a control circuit, an antenna, and an input and output device.

The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiment. The memory is mainly used to store software programs and data. The control circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals. The control circuit and the antenna together can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art can understand that, for ease of description, FIG. 4 only shows a memory and a processor. In actual terminal devices, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.

As an optional implementation, the processor may include a baseband processor and a central processing unit. The baseband processor is mainly used to process communication protocols and communication data. The central processing unit is mainly used to control the entire terminal device and execute Software program, processing the data of the software program. The processor in FIG. 4 integrates the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit may also be independent processors, which are interconnected by technologies such as buses. Those skilled in the art can understand that the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data can be built in the processor, or can be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

Exemplarily, in the embodiment of the present application, the antenna and control circuit with the transceiver function may be regarded as the transceiver unit 101 of the terminal device 10, and the processor with the processing function may be regarded as the processing unit 102 of the terminal device 10. As shown in FIG. 4, the terminal device 10 includes a transceiver unit 101 and a processing unit 102. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on. Optionally, the device for implementing the receiving function in the transceiver unit 101 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 101 as the sending unit, that is, the transceiver unit 101 includes a receiving unit and a sending unit. Exemplarily, the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.

The terminal device shown in FIG. 4 can perform various actions performed by the terminal device in the foregoing method. Here, in order to avoid redundant description, detailed descriptions thereof are omitted.

Fig. 5 is a schematic structural diagram of a network device provided by the present application. The network device may be a base station, for example. As shown in Fig. 5, the base station can be applied to the communication system shown in Fig. 1 to perform the functions of the network device in the above method embodiment. The base station 20 may include one or more radio frequency units, such as a remote radio unit (RRU) 201 and one or more baseband units (BBU) (also known as digital units (DU)) ) 202. The RRU 201 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 2011 and a radio frequency unit 2012. The RRU 201 part is mainly used for receiving and sending of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for transmitting the BFR configuration of the foregoing method embodiment. The BBU 202 part is mainly used for baseband processing, control of the base station, and so on. The RRU 201 and the BBU 202 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 202 is the control center of the base station, and may also be called a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing unit) 202 may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.

In an embodiment, the BBU 202 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) with a single access indication, or may respectively support different access standards Wireless access network (such as LTE network, 5G network or other network). The BBU 202 further includes a memory 2021 and a processor 2022, and the memory 2021 is used to store necessary instructions and data. The processor 2022 is used to control the base station to perform necessary actions, for example, used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment. The memory 2021 and the processor 2022 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

In addition, the network equipment is not limited to the above forms, and may also be in other forms: for example: including BBU and adaptive radio unit (ARU), or BBU and active antenna unit (AAU); or Customer premises equipment (CPE) may also be in other forms, which is not limited by this application.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The aforementioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It should be understood that the processor in this embodiment of the application may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), and application-specific integrated circuits. (application specific integrated circuit, ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.

It should also be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable only Read memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of random access memory (RAM) are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (DRAM), and synchronous dynamic random access memory (DRAM). Access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory Take memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).

According to the method provided in the embodiments of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the embodiment shown in FIG. 2 Method in.

According to the method provided by the embodiment of the present application, the present application also provides a computer-readable medium storing program code, which when the program code runs on a computer, causes the computer to execute the embodiment shown in FIG. 2 Method in.

According to the method provided in the embodiments of the present application, the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

The foregoing embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital versatile disc (DVD)), or a semiconductor medium. The semiconductor medium may be a solid state drive.

It should be understood that, in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, rather than corresponding to the embodiments of the present application. The implementation process constitutes any limitation.

It should also be understood that in this application, "when", "if" and "if" all refer to the terminal device or network device will make corresponding processing under certain objective circumstances, and it is not a time limit, nor It does not mean that there are other restrictions when terminal equipment or network equipment is required to be implemented.

The term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations.

The term "at least one of..." or "at least one of..." or "at least one of..." herein means all or any combination of the listed items, for example, "A, At least one of B and C" can mean: A alone, B alone, C alone, A and B, B and C, and A, B and C.

It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, and B can also be determined according to A and/or other information.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A beam failure recovery method is characterized in that it comprises:

The terminal device detects that at least one of the multiple associated cells has a beam failure;

The terminal device determines that beam failure occurs in the multiple cells;

The terminal device determines at least one available beam, the at least one available beam is used for the terminal device to communicate with the network device in the multiple cells, wherein the at least one available beam is one of the multiple cells A set of candidate beams corresponding to a cell.
The method according to claim 1, wherein the determining at least one available beam by the terminal device comprises:

In a case where at least one cell of the plurality of cells is configured with a candidate beam set, the terminal device determines the at least one available beam.
The method according to claim 1 or 2, wherein the at least one available beam is a beam that meets a preset condition or has the best beam quality among candidate beam sets corresponding to the multiple cells.
The method according to any one of claims 1 to 3, wherein the method further comprises:

Sending, by the terminal device, a beam failure recovery request to the network device according to the at least one available beam;

The terminal device receives a beam failure recovery request response for the beam failure recovery request, and the beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.
The method according to claim 4, wherein the method further comprises:

The terminal device receives the media access control control element MAC CE sent by the network device, where the MAC CE is used to add at least one target beam to the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH respectively corresponding to the multiple cells In the beam list of the physical uplink control channel PUCCH and/or the physical uplink shared channel PUSCH, the at least one target beam is used for the terminal device to communicate with the network device on the multiple cells.
The method of claim 5, wherein the at least one target beam is the at least one available beam.
The method according to any one of claims 4 to 6, wherein before the terminal device receives the MAC CE, the method further comprises:

The terminal device transmits the PUCCH in the multiple cells through the transmission beam corresponding to the at least one available beam; and/or

The terminal device receives the physical downlink control channel PDCCH and/or the physical downlink shared channel PDSCH through the at least one available beam in the multiple cells.
7. The method according to any one of claims 4 to 7, wherein after the terminal device receives the beam failure recovery request response, the method further comprises:

The terminal device resets or clears the time windows for the control beam failure recovery corresponding to the multiple cells respectively, and/or retransmits the control beam failure recovery request corresponding to the multiple cells respectively The counter of times is reset or cleared.
The method according to any one of claims 4 to 8, wherein the multiple cells correspond to one cell group, or the physical downlink control channel PDCCH beams corresponding to the multiple cells are the same.
The method according to claim 9, wherein the beam failure recovery request includes at least one of the following information: an identifier corresponding to each of the multiple cells, and an identifier of one of the multiple cells , The beam identifier of the physical downlink control channel PDCCH corresponding to the multiple cells, or the identifier of the cell group corresponding to the multiple cells.
The method according to any one of claims 1 to 10, wherein after the terminal device determines that the multiple cells have beam failures, the method further comprises:

The terminal device resets or clears the counters for determining beam failures corresponding to the multiple cells, and/or resets or resets the time windows for determining beam failures corresponding to the multiple cells. Cleared.
A communication device, characterized by comprising:

A processing unit, configured to detect beam failure in at least one of the multiple associated cells;

The processing unit is further configured to determine that beam failure occurs in the multiple cells;

The processing unit is further configured to determine at least one available beam, where the at least one available beam is used by the terminal device to communicate with the network device in the multiple cells, wherein the at least one available beam belongs to the multiple cells. The set of candidate beams corresponding to one of the cells.
The device according to claim 12, wherein the processing unit is specifically configured to:

In a case where a candidate beam set is configured in at least one cell of the plurality of cells, the at least one available beam is determined.
The apparatus according to claim 12 or 13, wherein the at least one available beam is a beam that meets a preset condition or has the best beam quality among candidate beam sets corresponding to the multiple cells.
The device according to any one of claims 12 to 14, wherein the device further comprises a transceiver unit, configured to:

Sending a beam failure recovery request to the network device according to the at least one available beam;

Receiving a beam failure recovery request response for the beam failure recovery request, where the beam failure recovery request response is used to indicate that the beam failure recovery of the multiple cells is successful.
The device according to claim 15, wherein the transceiver unit is further configured to:

Receive a media access control control element MAC CE sent by a network device, where the MAC CE is used to add at least one target beam to the physical downlink control channel PDCCH, physical downlink shared channel PDSCH, and physical uplink control corresponding to the multiple cells respectively In the beam list of the channel PUCCH and/or the physical uplink shared channel PUSCH, the at least one target beam is used for the apparatus to communicate with the network equipment on the multiple cells.
The apparatus according to claim 16, wherein the at least one target beam is the at least one available beam.
The device according to any one of claims 15 to 17, wherein the transceiver unit is further configured to:

Transmit the PUCCH in the multiple cells through the transmission beam corresponding to the at least one available beam; and/or

The physical downlink control channel PDCCH and/or the physical downlink shared channel PDSCH are received through the at least one available beam in the multiple cells.
The device according to any one of claims 15 to 18, wherein the processing unit is further configured to:

Reset or clear the time windows for controlling the beam failure recovery corresponding to the multiple cells, and/or reset the counters for controlling the number of beam failure recovery request retransmissions corresponding to the multiple cells. Set or clear.
The apparatus according to any one of claims 15 to 19, wherein the multiple cells correspond to one cell group, or the physical downlink control channel PDCCH beams corresponding to the multiple cells are the same.
A communication device, characterized by comprising a processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes The method of any one of claims 1 to 11.
A computer-readable medium, characterized by comprising a computer program, which when the computer program runs on a computer, causes the computer to execute the method according to any one of claims 1 to 11.