CN114041321A

CN114041321A - Beam failure detection method and device

Info

Publication number: CN114041321A
Application number: CN201980098092.2A
Authority: CN
Inventors: 张荻; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2022-02-11
Also published as: WO2021062832A1

Abstract

Disclosed are a beam failure detection method and device, relating to the field of communications and solving the problems of higher complexity of beam failure detection for each cell individually, and waste of frequently transmitted beam failure recovery request information and resources. The method comprises the following steps: firstly, grouping a plurality of cells according to the space related parameter information, and carrying out beam failure detection on any cell group according to the beam failure detection parameters of the cell group, wherein the beam failure detection parameters of the cell group can be determined according to the beam failure detection parameters of the cells contained in the cell group.

Description

Beam failure detection method and device

Technical Field

The embodiment of the application relates to the field of communication, in particular to a beam failure detection method and device.

Background

In order to cope with explosive mobile data traffic increase, massive mobile communication device connection, and various new services and application scenarios which are continuously emerging in the future, the fifth generation (5G) mobile communication system is produced, and the 5G mobile communication system is also called a new radio access technology (NR) system.

In the NR system, a signal transmission mechanism based on a beamforming technology is introduced, that is, the signal transmission power is increased by increasing the antenna gain, so as to compensate for the path loss of a wireless signal in the process of transmitting the wireless signal between the network device and the terminal device in a high-frequency band. However, due to the poor diffraction capability of the wireless signal in the high frequency channel, there may be a case where the wireless signal is blocked and cannot be transmitted further. In order to prevent a case where a radio signal is blocked to cause a sudden interruption of communication from occurring, the terminal device may measure the communication quality of a Beam Failure Detection Reference Signal (BFDRS) configured by the network device to determine whether a link failure occurs.

In general, a network device may configure a terminal device with multiple cells (e.g., a primary cell and/or a secondary cell) and beam failure detection parameters for each cell, where the beam failure detection parameters include a BFDRS, a beam failure detection timer, and a maximum number of beam failure cases. The terminal device performs beam failure detection on each cell independently according to the beam failure detection parameters, and at this time, the terminal device needs to detect a plurality of beam failure detection reference signals, and also needs to maintain a plurality of beam failure detection timers and beam failure detection counters, so that the implementation complexity of the terminal device is high. In addition, if the terminal device determines that the time for the beam failure of each cell is different, it may cause frequent transmission of beam failure recovery request information (BFRQ), thereby causing resource waste.

Disclosure of Invention

The application provides a beam failure detection method and device, which solve the problems of higher complexity of beam failure detection on each cell independently, frequent transmission of beam failure recovery request information and resource waste.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, the present application provides a beam failure detection method, where the method is applicable to a terminal device, or the method is applicable to a communication apparatus that can support the terminal device to implement the method, for example, the communication apparatus includes a chip system, and the method includes: and determining a first cell group, and performing beam failure detection on the first cell group according to a first parameter of the first cell group. Wherein the first cell group comprises N cells, and N is an integer greater than or equal to 2. It is to be understood that at least two of the N cells are associated with the same spatially dependent parameter information. It is also to be understood that each of the N cells is associated with the same spatially dependent parameter information.

According to the beam failure detection method provided by the application, the cells with the same beam direction are divided into one group, and the beam failure detection can be performed on all the cells in the cell group through one beam failure recovery process, so that the implementation complexity of the beam failure detection performed on a plurality of cells by the terminal equipment is effectively reduced; in addition, the beam failure recovery request information of a plurality of cells is transmitted through one MAC-CE, so that the resource overhead of transmitting the beam failure recovery request information is effectively saved.

In a possible implementation manner, the spatial correlation parameter information may refer to a TCI status, and the terminal device may determine the first cell group according to the TCI status. In some embodiments, the terminal device may determine cells of which TCI states of the control resource sets are the same as the first cell group.

In a first possible implementation, the terminal device may determine at least two cells having the same TCI status as the at least one control resource set as the first cell group. The specific implementation modes of at least two cells in the first cell group having the same state as at least one TCI include the following:

in the first mode, the terminal device determines at least two cells with the same TCI state as the first cell group. It should be understood that at least two of the N cells are associated with the same TCI status.

In the second mode, the terminal device determines any two cells associated with the same TCI state as the first cell group. It should be understood that any two of the N cells are associated with the same TCI state.

And thirdly, the terminal equipment determines all the cells associated with the same TCI state as the first cell group. It should be understood that any two of the N cells are associated with the same TCI state.

In a second possible implementation, the terminal device may determine one or more cells associated with the same spatial correlation parameter information as the first cell group. It is to be understood that each of the N cells is associated with the same spatially dependent parameter information. The specific implementation manner of associating each cell in the first cell group with the same spatial correlation parameter information includes the following steps:

in a first manner, the terminal device may determine cells having the same TCI state set as the first cell group. It should be understood that the set of TCI states for any two cells in the first cell group is the same. Any one TCI state set is a set of TCI states of all control resource sets of the corresponding cell.

In a second mode, the terminal device may determine cells in which at least one identical TCI state exists as the first cell group. At least one identical TCI state exists for all cells in the first cell group. The at least one identical TCI state is a TCI state of at least one control resource set of a corresponding cell.

In a third way, the terminal device may determine cells of the control resource set having at least one same TCI status as the first cell group. Each cell in the first cell group comprises at least one control resource set, wherein all TCIs in the at least one control resource set comprised by all cells have the same state.

In another possible implementation manner, the spatial correlation parameter information may refer to QCL information, and the terminal device may determine the first cell group according to the QCL information. In some embodiments, the terminal device may determine cells in which QCL information of the control resource set is the same as the first cell group. The QCL information may be QCL information of type D or QCL information of type a.

In a first possible implementation, the terminal device may determine at least two cells that are the same as the QCL information of the at least one control resource set as the first cell group. Specific implementation manners of the at least two cells in the first cell group having the same information as the at least one QCL include the following:

in the first mode, the terminal device determines at least two cells with the same QCL information as the first cell group. It should be understood that at least two of the N cells are associated with the same QCL information.

In the second mode, the terminal device determines any two cells associated with the same QCL information as the first cell group. It should be understood that any two of the N cells are associated with the same QCL information.

And thirdly, the terminal equipment determines all the cells associated with the same QCL information as the first cell group. It should be understood that any two of the N cells are associated with the same QCL information.

In a second possible implementation manner, the terminal device may determine one or more cells associated with the same spatial correlation parameter information as the first cell group. It is to be understood that each of the N cells is associated with the same spatially dependent parameter information. The specific implementation manner of associating each cell in the first cell group with the same spatial correlation parameter information includes the following steps:

in a first manner, the terminal device may determine cells having the same QCL information set as the first cell group. It should be understood that the QCL information sets for any two cells in the first cell group are the same. Any one of the QCL information sets is a set of QCL information of all control resource sets of the corresponding cell.

In a second manner, the terminal device may determine cells in which at least one same QCL information exists as the first cell group. There is at least one same QCL information for all cells in the first cell group. The at least one same QCL information is QCL information of at least one control resource set of a corresponding cell.

In a third way, the terminal device may determine cells having at least one same set of control resources as the first cell group. Each cell in the first cell group includes at least one control resource set, wherein all QCL information in the at least one control resource set included in all cells is the same.

In another possible implementation manner, the terminal device may determine the first parameter according to a subcarrier spacing. For example, the first parameter is a beam failure detection parameter of a cell with the largest subcarrier spacing in the first cell group.

In another possible implementation manner, the terminal device may determine the first parameter according to a cell identifier. For example, the first parameter is a beam failure detection parameter of a cell with the smallest cell identification in the first cell group.

In another possible implementation manner, the terminal device may determine the first parameter according to the maximum number of beam failure cases. For example, the first parameter is a beam failure detection parameter of a cell with the smallest maximum number of beam failure instances.

In another possible implementation manner, the terminal device may determine the first parameter according to a beam failure detection timer. For example, the first parameter is a beam failure detection parameter of a cell with the smallest beam failure detection timer.

In another possible implementation manner, the terminal device may determine the first parameter according to an indication manner of the beam failure detection reference signal resource. For example, the first parameter is a beam failure detection parameter of a cell in which the implicitly indicated beam failure detection reference signal resource is located.

In another possible implementation manner, the terminal device may determine the first parameter according to a period of the beam failure detection reference signal resource. For example, the first parameter is a beam failure detection parameter of a cell in which the beam failure detection reference signal resource of the minimum period is located, the transmission configuration indication state corresponding to the beam failure detection reference signal resource of the minimum period is the same transmission configuration indication state of the N cells, or the quasi-co-location information corresponding to the beam failure detection reference signal resource of the minimum period is the same quasi-co-location information of the N cells.

In another possible implementation manner, the terminal device may determine the first reference according to a beam failure case indication period. For example, the first parameter is a beam failure detection parameter of a cell with a minimum beam failure case indication period.

In another possible implementation manner, the terminal device may determine the first parameter according to a transmission configuration indication state of the control resource set. For example, the first parameter is a beam failure detection parameter of a cell with the smallest number of transmission configuration indication states of the control resource set in the N cells. Alternatively, the terminal device may determine the first parameter according to quasi co-location information of the control resource set. For example, the first parameter is a beam failure detection parameter of a cell with the smallest number of quasi co-located information of the control resource set among the N cells.

In another possible implementation, the beam failure detection parameter includes at least one of a beam failure detection reference signal resource, a maximum number of beam failure case, a beam failure detection timer, and a beam failure case indication period.

In another possible implementation, N cells in the first cell group share one beam failure detection timer and one beam failure detection counter.

In another possible implementation manner, the method further includes: determining a first cell group beam failure; transmitting beam failure recovery request information, the beam failure recovery request information including at least one of: identification information of one cell in the first cell group and at least one reference signal resource information, the at least one reference signal resource information being used for recovering a link of the at least one cell in the first cell group.

In a second aspect, the present application provides a beam failure detection method, where the method is applicable to a network device, or the method is applicable to a communication apparatus that can support the network device to implement the method, for example, the communication apparatus includes a chip system, and the method includes: determining a first cell group, wherein at least two cells in N cells are associated with the same space related parameter information, and N is an integer greater than or equal to 2; receiving beam failure recovery request information, the beam failure recovery request information including at least one of: identification information of one cell in the first cell group and at least one reference signal resource information, the at least one reference signal resource information being used for recovering a link of the at least one cell in the first cell group.

In a third mode, the terminal device determines any two cells associated with the same TCI state as the first cell group. It should be understood that any two of the N cells are associated with the same TCI state.

In a second possible implementation, the terminal device may determine each cell associated with the same spatial correlation parameter information as the first cell group. It is to be understood that each of the N cells is associated with the same spatially dependent parameter information. The specific implementation manner of associating each cell in the first cell group with the same spatial correlation parameter information includes the following steps:

In a third way, the terminal device may determine cells having at least one same set of control resources as the first cell group. Each cell in the first cell group comprises at least one control resource set, wherein all TCIs in the at least one control resource set comprised by all cells have the same state.

And thirdly, the terminal equipment determines any two cells associated with the same QCL information as a first cell group. It should be understood that any two of the N cells are associated with the same QCL information.

In a third aspect, an embodiment of the present application further provides a communication apparatus, and for beneficial effects, reference may be made to the description of the first aspect and details are not repeated here. The communication device has the functionality to implement the actions in the method instance of the first aspect described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. In one possible design, the communication device includes: a transceiving unit and a processing unit. And the processing unit is used for determining the first cell group and carrying out beam failure detection on the first cell group according to the first parameter of the first cell group. Wherein the first cell group comprises N cells, and N is an integer greater than or equal to 2. It is to be understood that at least two of the N cells are associated with the same spatially dependent parameter information. It is also to be understood that each of the N cells is associated with the same spatially dependent parameter information. The transceiver unit is configured to transmit beam failure recovery request information, where the beam failure recovery request information includes at least one of the following: identification information of one cell in the first cell group and at least one reference signal resource information, the at least one reference signal resource information being used for recovering a link of the at least one cell in the first cell group. The units may perform corresponding functions in the method example of the first aspect, for specific reference, detailed description of the method example is given, and details are not repeated here.

In a fourth aspect, the present application further provides a communication apparatus, and reference may be made to the description of the second aspect for advantageous effects that are not described herein again. The communication device has the functionality to implement the actions in the method example of the second aspect described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. In one possible design, the communication device includes: a transceiving unit and a processing unit. The processing unit is used for determining the first cell group. The transceiver unit is configured to receive beam failure recovery request information, where the beam failure recovery request information includes at least one of the following: identification information of one cell in the first cell group and at least one reference signal resource information, the at least one reference signal resource information being used for recovering a link of the at least one cell in the first cell group. The modules may perform corresponding functions in the method example of the second aspect, for specific reference, detailed description of the method example is given, and details are not repeated here.

In a fifth aspect, a communication apparatus is provided, where the communication apparatus may be the terminal device in the above method embodiment, or a chip provided in the terminal device. The communication device comprises a communication interface, a processor and optionally a memory. Wherein the memory is adapted to store a computer program or instructions, and the processor is coupled to the memory and the communication interface, and when the processor executes the computer program or instructions, the communication apparatus is adapted to perform the method performed by the terminal device in the above-mentioned method embodiments.

In a sixth aspect, a communication apparatus is provided, where the communication apparatus may be the network device in the above method embodiment, or a chip disposed in the network device. The communication device comprises a communication interface, a processor and optionally a memory. Wherein the memory is used for storing a computer program or instructions, and the processor is coupled with the memory and the communication interface, and when the processor executes the computer program or instructions, the communication device is caused to execute the method executed by the network device in the above method embodiment.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code which, when run, causes the method performed by the terminal device in the above aspects to be performed.

In an eighth aspect, there is provided a computer program product comprising: computer program code which, when executed, causes the method performed by the network device in the above aspects to be performed.

In a ninth aspect, the present application provides a chip system, which includes a processor, and is configured to implement the functions of the terminal device in the methods of the above aspects. In one possible design, the system-on-chip further includes a memory for storing program instructions and/or data. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In a tenth aspect, the present application provides a chip system, which includes a processor for implementing the functions of the network device in the method of the above aspects. In one possible design, the system-on-chip further includes a memory for storing program instructions and/or data. The chip system may be formed by a chip, and may also include a chip and other discrete devices.

In an eleventh aspect, the present application provides a computer-readable storage medium storing a computer program that, when executed, implements the method performed by the terminal device in the above-described aspects.

In a twelfth aspect, the present application provides a computer-readable storage medium storing a computer program that, when executed, implements the method performed by the network device in the above aspects.

In the present application, the names of the terminal device, the network device and the communication means do not limit the devices themselves, and in actual implementation, these devices may appear by other names. Provided that the function of each device is similar to that of the present application, and that the devices are within the scope of the claims of the present application and their equivalents.

Drawings

Fig. 1 is a flow chart of a beam failure recovery procedure according to an embodiment;

FIG. 2 is a schematic diagram of beam failure detection according to an embodiment;

FIG. 3 is a diagram illustrating beam failure detection according to an embodiment;

FIG. 4 is a diagram illustrating beam failure detection according to an embodiment;

FIG. 5 is a block diagram of a communication system according to an embodiment;

FIG. 6 is a block diagram of a communication system according to an embodiment;

FIG. 7 is a block diagram of a communication system according to an embodiment;

FIG. 8 is a flowchart of a method for beam failure detection according to an embodiment;

FIG. 9 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 10 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 11 is a schematic diagram of a cell grouping according to an embodiment;

FIG. 12 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 13 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 14 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 15 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 16 is a schematic diagram of a cell grouping according to an embodiment;

FIG. 17 is a schematic diagram of a cell grouping provided in an embodiment;

FIG. 18 is a schematic diagram of a cell grouping provided in an embodiment;

fig. 19 is a schematic diagram illustrating an exemplary embodiment of a communication device;

fig. 20 is a schematic diagram illustrating a communication device according to an embodiment.

Detailed Description

The terms "first," "second," and "third," etc. in the description and claims of this application and the above-described drawings are used for distinguishing between different objects and not for limiting a particular order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

For clarity and conciseness of the following descriptions of the various embodiments, a brief introduction to the related art is first given:

1. control resource set (CORESET)

In order to improve the efficiency of blind detection of a control channel by terminal equipment, a concept of a control resource set is provided in the process of formulating an NR standard. The network device may configure one or more resource sets for the terminal device, and is configured to send a Physical Downlink Control Channel (PDCCH). The network device may send a control channel to the terminal device on any control resource set corresponding to the terminal device. Furthermore, the network device needs to inform the terminal device about the associated other configurations of the set of control resources, such as the set of search spaces, etc. There are differences in configuration information of each control resource set, such as frequency domain width difference, time domain length difference, and the like. The control resource set in the present application may be a core set or a control area (control region) or an enhanced-physical downlink control channel (ePDCCH) set (set) defined by the 5G mobile communication system.

The time-frequency position occupied by the PDCCH may be referred to as a downlink control region. In Long Term Evolution (LTE), the PDCCH is always located in the first m (m may take values of 1, 2, 3, and 4) symbols of a subframe. It should be noted that the positions of the E-PDCCH and the R-PDCCH in LTE are not in the first m symbols.

In NR, a downlink Control region may be flexibly configured by Radio Resource Control (RRC) signaling through a Control Resource set and a search space set:

the control resource set may configure information such as a frequency domain position of a PDCCH or a Control Channel Element (CCE), and a number of persistent symbols in a time domain;

the search space set can configure the detection period and offset of the PDCCH, the initial symbol in a time slot and other information.

For example, the search space set may configure the PDCCH period to be 1 slot, and the time domain start symbol is symbol 0, then the terminal device may detect the PDCCH at the start position of each slot.

2. Spatial correlation parameter information

The spatial-dependent parameter information may be quasi-co-location (QCL) information or spatial-dependent information (spatial correlation). In general, the QCL information is used to indicate spatial correlation parameters (also referred to as spatial correlation characteristics) of downlink signals (such as PDCCH/PDSCH/CSI-RS/DMRS/TRS), and the spatial correlation information is used to indicate spatial correlation parameters (also referred to as spatial correlation characteristics) of uplink signals (such as PUCCH/PUSCH/SRS/DMRS).

Quasi co-location, also referred to as quasi co-sited, co-located. The QCL information may also be referred to as QCL hypothesis information. The QCL information is used to assist in describing the terminal device receiving beamforming information and receiving procedures.

The QCL information may be used to indicate a QCL relationship between two reference signals, where the target reference signal may generally be a demodulation reference signal (DMRS), a channel state information reference signal (CSI-RS), etc., and the referenced reference signal or source reference signal may generally be a CSI-RS, a synchronization signal broadcast channel block (SSB)), a Sounding Reference Signal (SRS), etc. It should be understood that a Tracking Reference Signal (TRS) is also one of the CSI-RSs. It should be understood that the target reference signal may generally be a downlink signal.

The signals corresponding to the antenna ports having the QCL relationship may have the same or similar spatial characteristic parameters (or called parameters), or the spatial characteristic parameters (or called parameters) of one antenna port may be used to determine the spatial characteristic parameters (or called parameters) of another antenna port having the QCL relationship with the antenna port, or two antenna ports have the same or similar spatial characteristic parameters (or called parameters), or the difference between the spatial characteristic parameters (or called parameters) of the two antenna ports is smaller than a certain threshold.

The spatial correlation information is used for assisting in describing beamforming information and a transmitting process of a transmitting side of the terminal equipment.

The spatial correlation information is used to indicate a spatial transmission parameter relationship between two reference signals, where the target reference signal may be generally a DMRS, SRS, etc., and the referenced reference signal or source reference signal may be generally a CSI-RS, SRS, SSB, etc. It should be understood that the target reference signal may generally be an uplink signal.

It is to be understood that the spatial characteristic parameters of two reference signals or channels satisfying the QCL relationship are the same (or similar ), so that the spatial characteristic parameter of the target reference signal can be inferred based on the source reference signal resource index.

It should also be understood that the spatial characteristic parameters of two reference signals or channels that satisfy spatial correlation information are the same (or similar ), such that the spatial characteristic parameter of the target reference signal can be inferred based on the source reference signal resource index.

Wherein the spatial characteristic parameters comprise one or more of the following parameters:

an incident angle (angle of arrival, AoA), a main (dominant) incident angle AoA, an average incident angle, a power angle spectrum of incident angles (PAS), an emergence angle (angle of departure, AoD), a main emergence angle, an average emergence angle, a power angle spectrum of emergence angles, terminal device transmit beamforming, terminal device receive beamforming, spatial channel correlation, network device transmit beamforming, network device receive beamforming, average channel gain, average channel delay (average delay), delay spread (delay spread), Doppler spread (Doppler spread), Doppler shift (Doppler shift), spatial receive parameters (spatial Rx parameters), and the like.

The angle may be a decomposition value of different dimensions, or a combination of decomposition values of different dimensions. The antenna ports may be antenna ports with different antenna port numbers, and/or antenna ports with the same antenna port number for transmitting or receiving information in different time and/or frequency and/or code domain resources, and/or antenna ports with different antenna port numbers for transmitting or receiving information in different time and/or frequency and/or code domain resources.

The spatial characteristic parameters describe spatial channel characteristics between antenna ports of the source reference signal and the target reference signal, and are helpful for the terminal device to complete the beamforming or receiving process at the receiving side according to the QCL information. It should be understood that the terminal device may receive the target reference signal according to the receiving beam information of the source reference signal indicated by the QCL information; the spatial characteristic parameters also help the terminal device to complete the beam forming or the transmission processing process at the transmitting side according to the spatial correlation information, and it should be understood that the terminal device can transmit the target reference signal according to the transmission beam information of the source reference signal indicated by the spatial correlation information.

As an optional implementation manner, in order to save QCL information indication overhead of the network device for the terminal device, the network device may indicate that a demodulation reference signal of a PDCCH or a Physical Downlink Shared Channel (PDSCH) and one or more of a plurality of reference signal resources reported by the terminal device before satisfy a QCL relationship, for example, the reference signal may be a CSI-RS. Here, each reported CSI-RS resource index corresponds to a transmit-receive beam pair previously established based on the CSI-RS resource measurement. It should be understood that the reception beam information of two reference signals or channels satisfying the QCL relationship is the same, and the terminal device may infer the reception beam information of receiving the PDCCH or PDSCH from the reference signal resource index.

Four types of QCLs are defined in the existing standard, and the network device may configure one or more types of QCLs, such as QCL type a + D, C + D:

QCL types A：Doppler shift，Doppler spread，average delay，delay spread

QCL types B：Doppler shift，Doppler spread

QCL types C：average delay，Doppler shift

QCL types D：Spatial Rx parameter

when a QCL relationship refers to a QCL relationship of type D, it may be considered a spatial QCL. When the antenna ports satisfy the spatial-domain QCL relationship, the QCL relationship (referred to as spatial relationship) between the ports of the downlink signals and the ports of the downlink signals, or between the ports of the uplink signals and the ports of the uplink signals may be that the two signals have the same AOA or AOD, which means that the two signals have the same receive beam or transmit beam. For another example, for QCL relationship between downlink signals and uplink signals or between ports of uplink signals and downlink signals, AOAs and AODs of two signals may have a corresponding relationship, or AODs and AOAs of two signals have a corresponding relationship, that is, an uplink transmit beam may be determined according to a downlink receive beam or a downlink receive beam may be determined according to an uplink transmit beam by using beam reciprocity.

From the transmitting end, if it is said that two antenna ports are spatial QCL, it may be said that the corresponding beam directions of the two antenna ports are spatially consistent. From the perspective of the receiving end, if it is said that the two antenna ports are spatial QCL, it may mean that the receiving end can receive signals transmitted by the two antenna ports in the same beam direction.

Signals transmitted on ports having spatial QCL relationships may also have corresponding beams, which may include at least one of: the same receive beam, the same transmit beam, a transmit beam corresponding to the receive beam (corresponding to a reciprocal scene), a receive beam corresponding to the transmit beam (corresponding to a reciprocal scene).

A signal transmitted on a port having a spatial QCL relationship may also be understood as a signal received or transmitted using the same spatial filter. The spatial filter may be at least one of: precoding, weight of antenna port, phase deflection of antenna port, and amplitude gain of antenna port.

Signals transmitted on ports having spatial QCL relationships may also be understood as having corresponding Beam Pair Links (BPLs) including at least one of: the same downlink BPL, the same uplink BPL, the uplink BPL corresponding to the downlink BPL, and the downlink BPL corresponding to the uplink BPL.

Accordingly, the spatial reception parameter (i.e., QCL of type D) may be understood as a parameter for indicating direction information of a reception beam.

In the examples of the present application, the correspondence of certain parameters may also be applied to the scenario described by QCL.

It should be understood that the context applicable to QCL assumption in the present application may also be an association between two reference signals, further or between transmission objects.

3. Transmission Configuration Indicator (TCI) status (state)

The TCI is used to indicate QCL information of a signal or channel. Wherein the channel may be PDCCH/core set or PDSCH. The signal may be a CSI-RS, DMRS, TRS, PTRS, or the like. The TCI information indicates that the reference signal included in the TCI and the channel or the signal satisfy the QCL relationship, and is mainly used for indicating that when the signal or the channel is received, information such as the spatial characteristic parameter of the TCI information is the same as, similar to, or close to information such as the spatial characteristic parameter of the reference signal included in the TCI.

A TCI state (TCI state) may configure one or more referenced reference signals, and associated QCL types. The QCL types may be further classified into A, B, C and D categories, which are different combinations or choices of { Doppler shift, Doppler spread, average delay, delay spread, spatial Rx parameter }. The TCI status includes QCL information, or the TCI status is used to indicate QCL information.

4. Synchronous signal broadcast channel block (PBCH) block, SS/PBCH block)

The SS/PBCH block may also be referred to as an SSB. Wherein the SSB includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH. The method is mainly used for cell search, cell synchronization and broadcast information bearing signals.

5. Cell carrier correlation concept

A Component Carrier (CC) may also be referred to as a component carrier, or a component carrier, etc. Each carrier in the multi-carrier aggregation may be referred to as a "CC", each carrier is composed of one or more Physical Resource Blocks (PRBs), and each carrier may have a Physical Downlink Control Channel (PDCCH) corresponding thereto, and schedules a Physical Downlink Shared Channel (PDSCH) of each CC; or, some carriers do not have a PDCCH, and at this time, the carriers may perform cross-carrier scheduling, that is, the PDCCH of one CC schedules the PDSCH of another CC. A terminal device may receive data on multiple CCs.

Carrier Aggregation (CA) may refer to aggregation of a plurality of contiguous or non-contiguous element carriers into a larger bandwidth.

Primary cell/primary serving cell (PCell) is a cell where the CA UE resides. Generally, only the PCell has a Physical Uplink Control Channel (PUCCH).

A Primary Secondary Cell (PSCell) is a special Secondary Cell on a Secondary base station (Secondary eNodeB, SeNB) that a Primary base station (master eNodeB, MeNB) configures to a DC UE through RRC connection signaling.

A Secondary Cell (SCell) refers to a Cell configured to a terminal device of a CA through an RRC connection signaling, and operates on an SCC (Secondary carrier) to provide more radio resources for the CA terminal device. The SCell may have downlink only or may exist in both uplink and downlink.

A Special Cell (SpCell), wherein for a Dual Connectivity (DC) scenario, the SpCell refers to a PCell of a Master Cell Group (MCG) or a PSCell of a Slave Cell Group (SCG); otherwise, like the CA scenario, SpCell refers to PCell.

MCG/SCG means that the group in which the cell providing service for the terminal equipment in the main base station is located is a main cell group. In dual connectivity mode, the MeNB is associated with a set of serving cells, including the PCell and one or more scells.

The SCG means that a group in which a cell providing service for the UE is located in the secondary base station is a secondary cell group. In dual linked mode, includes PSCell and 0 or more scells.

The MeNB is a base station to which the DC terminal device resides.

The SeNB is another base station that the MeNB configures to the DC UE through RRC connection signaling.

6. Beam (beam)

A beam is a communication resource. The beam may be a wide beam, or a narrow beam, or other type of beam. The technique of forming the beam may be a beamforming technique or other technical means. The beamforming technology may be embodied as a digital beamforming technology, an analog beamforming technology, or a hybrid digital/analog beamforming technology. Different beams may be considered different resources. The same information or different information may be transmitted through different beams. Alternatively, a plurality of beams having the same or similar communication characteristics may be regarded as one beam. One beam may include one or more antenna ports for transmitting data channels, control channels, sounding signals, and the like, for example, a transmission beam may refer to the distribution of signal strength formed in different spatial directions after signals are transmitted through the antenna, and a reception beam may refer to the distribution of signal strength in different spatial directions of wireless signals received from the antenna. It is to be understood that the one or more antenna ports forming one beam may also be seen as one set of antenna ports.

The beams may be divided into a transmission beam and a reception beam of the network device and a transmission beam and a reception beam of the terminal device. The sending beam of the network equipment is used for describing the beam forming information of the sending side of the network equipment, the receiving beam of the base station is used for describing the beam forming information of the receiving side of the network equipment, the sending beam of the terminal equipment is used for describing the beam forming information of the sending side of the terminal equipment, and the receiving beam of the terminal is used for describing the beam forming information of the receiving side of the terminal equipment. I.e. the beams are used to describe the beamforming information.

The beams may correspond to time resources and/or spatial resources and/or frequency domain resources.

Alternatively, the beams may also correspond to reference signal resources (e.g., beamformed reference signal resources), or beamforming information.

Alternatively, the beam may also correspond to information associated with a reference signal resource of the network device, where the reference signal may be a channel state information reference signal (CSI-RS), an SSB, a demodulation reference signal (DMRS), a phase tracking signal (PTRS) tracking signal (TRS), or the like, and the information associated with the reference signal resource may be a reference signal resource identifier, or QCL information (especially, a QCL of type D type), or the like. The reference signal resource identifier corresponds to a transceiving beam pair established in the previous measurement based on the reference signal resource, and the terminal can deduce beam information through the reference signal resource index.

Alternatively, the beam may correspond to a spatial filter (spatial domain filter) or a spatial domain transmission filter (spatial domain transmission filter).

Wherein, the receiving wave beam can be equivalent to a space transmission filter, a space receiving filter and a space receiving filter; the transmission beam may be equivalent to a spatial filter, a spatial transmission filter, and a spatial transmission filter. The information of the spatial correlation parameter may be equivalent to a spatial filter (spatial direct transmission/receive filter). Optionally, the spatial filter generally includes a spatial transmit filter, and/or a spatial receive filter. The spatial filter may also be referred to as a spatial transmit filter, a spatial receive filter, a spatial transmit filter, etc. The receiving beam at the terminal device side and the transmitting beam at the network device side may be downlink spatial filters, and the transmitting beam at the terminal device side and the receiving beam at the network device side may be uplink spatial filters.

7. Antenna port (antenna port)

An antenna port may also be referred to simply as a port. A transmit antenna identified by the receiving end device, or a spatially distinguishable transmit antenna. One antenna port may be configured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, and each antenna port may correspond to one reference signal port.

8. Bandwidth region (BWP)

The network device may configure one or more downlink/uplink bandwidth regions for the terminal device, and the BWP may be composed of PRBs contiguous in the frequency domain, and the BWP is a subset of the bandwidth of the terminal device. The minimum granularity of BWP in the frequency domain is 1 PRB. The system may configure one or more bandwidth regions for the terminal device, and the plurality of bandwidth regions may overlap (overlap) in the frequency domain.

In a single carrier scenario, a terminal device may have only one active BWP at a time, and the terminal device can only receive data/reference signals or transmit data/reference signals on the active BWP (active BWP).

In the present application, in case of being applicable to a BWP scenario, a specific BWP may also be a bandwidth set on a specific frequency, or a set consisting of multiple RBs.

9. Reference signals configured for detecting beam failure and recovering beam failure

In order to detect the beam failure, the network device needs to indicate the beam failure detection reference signal resource (which may also be referred to as a link failure detection reference signal resource) to the terminal device. The beam failure detection reference signal resource may have the following possible indication modes. For example, the network device may display a set of beam failure detection reference signal resources (beam failure detection RS sets) (e.g., beam failure detection RS resource configuration or beam failure detection RS or failure detection resources) configured for beam failure detection to the terminal device (which may also be referred to as a beam failure detection reference signal resource set). The network device configuration beam failure detection reference signal resource set may be indicated by one or more of RRC, MAC-CE, DCI signaling. For another example, the reference signal for beam failure detection may also be implicitly indicated, such as using a reference signal resource associated in a TCI (e.g., type-D QCL) indicating the PDCCH as the reference signal resource for beam failure detection, where the reference signal resource is a reference signal resource that satisfies a QCL relationship with the DMRS of the PDCCH and is a periodic reference signal resource. Optionally, when the network device displays that a set of reference signal resources for beam failure detection is configured, the terminal device may detect a beam failure according to the set of reference signal resources for beam failure detection; when the network device does not display the reference signal resource set configured for beam failure detection, the terminal device may detect beam failure according to the reference signal resource indicated in the above implicit manner.

Wherein, the RS in the beam failure detection reference signal resource set and the demodulation reference signal of the downlink physical control channel PDCCH satisfy a QCL relationship or use the same TCI state as the PDCCH, and when channel quality information (such as Reference Signal Receiving Power (RSRP), Channel Quality Indicator (CQI), block error rate (BLER), signal to Interference plus noise ratio (SINR), signal to noise ratio (SNR), and the like) of some or all reference signals in the set is lower than a predetermined threshold, it is determined that the beam fails. Wherein the falling below the predetermined threshold may be N consecutive times below the predetermined threshold or N times below the predetermined threshold for a certain period of time. The predetermined threshold may be referred to as a beam failure detection threshold, and may also be referred to as a beam failure threshold. It should be understood that the predetermined threshold may be any threshold used for detecting a beam failure, and the name of the predetermined threshold is not limited in the present application. Optionally, the beam failure detection threshold may be configured by the network device, and may also be the same threshold as a radio link failure out-of-synchronization threshold (out of sync). Optionally, when the network device configures a beam failure detection threshold, detecting a beam failure using the beam failure detection threshold; when the network device does not configure the beam failure detection threshold, the radio link out-of-step threshold may be used as the beam failure detection threshold to detect the beam failure. It should be understood that the beam failure detection reference signal here may be a channel quality of a certain transmission beam used for the terminal to detect the network device, the transmission beam being a beam used when the network device communicates with the terminal.

In order to recover the beam failure, the network device may further indicate, to the terminal device, a reference signal resource set (also referred to as a candidate reference signal resource set or a beam failure recovery reference signal resource set) for recovering a link between the terminal device and the network device (a candidate beam RS resource set or a beam failure recovery reference signal resource set). After the beam fails, the terminal device needs to select a reference signal resource whose channel quality information (such as one or more of RSRP, RSRQ, CQI, SINR, etc.) is higher than a predetermined threshold from the candidate reference signal resource set, so as to recover the communication link. It can also be understood as a reference signal set used by the terminal device to initiate link reconfiguration after determining that the beam failure occurs in the transmission beam of the network device. For example, the network device may display to the terminal device a set of reference signal resources configured for beam failure recovery. The network device configuration beam failure detection reference signal resource set may be indicated by one or more of RRC, MAC-CE, DCI signaling. The set of reference signal resources used for beam failure recovery may also be some default set of reference signal resources, (e.g. a set of reference signal resources used for beam management BM or for RRM measurements, a set of reference signal resources made up of all or part of SSBs, or some set of reference signal resources multiplexing other functions). Wherein, the reference signal resource set for Beam Management (BM) may be a reference signal resource set whose repeption is identified as "off" (and may also be a reference signal resource set whose repeption is identified as "on"). Optionally, when the network device configures a set of candidate reference signal resources, identifying a reference signal in the set of reference signal resources; when the network device is not configured with the candidate set of reference signal resources, a reference signal is identified in the default set of reference signal resources. The identified reference signal may be used to recover the beam failure. Optionally, the channel quality of the identified reference signal is greater than a preset threshold.

Optionally, the predetermined threshold used in identifying the reference signal for recovering the link may be configured by the network device, or may also be a predefined threshold. For example, when the network device is not configured with the threshold, the threshold for mobility measurement is used by default. The predetermined threshold may be referred to as a beam failure recovery threshold and may also be referred to as a link recovery threshold. It should be understood that the name of the predetermined threshold is not limited by the present invention as long as the threshold for the beam failure recovery can be the predetermined threshold.

It should be understood that in a specific implementation, the names of the two sets, i.e., the set of reference signal resources for beam failure detection and the set of reference signal resources for recovering the link between the terminal device and the network device, may also be called other names, and this application is not limited to this.

In the embodiment of the present application, a beam failure may also be referred to as a beam failure, a link failure, a communication link failure, or the like. In the embodiments of the present application, these concepts are the same meaning. The communication failure may refer to that the signal quality of a reference signal used for beam failure detection of the PDCCH is less than or equal to a preset threshold.

In this embodiment, the beam failure recovery may also be referred to as recovering the network device to communicate with the terminal device, and the beam failure recovery, the beam recovery, the link failure recovery, the link recovery, the communication failure recovery, the communication link failure recovery, the communication recovery, the link reconfiguration, and the like.

In the embodiment of the present application, the Beam failure recovery request (BFRQ) information may also be referred to as Beam failure recovery request information, Beam recovery request information, link failure recovery request information, link recovery request information, communication failure recovery request information, communication link failure recovery request information, communication link recovery request information, link reconfiguration request information, and the like. Alternatively, the communication failure recovery request may refer to a signal being sent on a resource used to carry the communication failure recovery request.

It should be understood that "information" in the present application may be replaced with "messages".

In this embodiment, the beam failure recovery response information may be referred to as a beam failure recovery response for short. The beam failure recovery response information may also be referred to as beam failure recovery response information, beam failure response information, beam recovery response, link failure recovery response information, link failure response information, link recovery response information, communication failure response information, communication recovery response information, communication link failure response information, communication link response information, link reconfiguration response information, and the like. It should be understood that, in the present application, the communication failure recovery response information may be simply referred to as response information.

In this embodiment of the present application, the beam failure recovery response information may refer to Downlink Control Information (DCI) that is received on a control resource set and/or a search space set for sending a beam failure recovery response and is scrambled by a cell radio network temporary identifier (C-RNTI), where the beam failure recovery response information may also be DCI scrambled by other information (e.g., a BFR-RNTI), the beam failure recovery response information may also be data scheduled by the DCI, and the beam failure recovery response information may also be ACK of the data scheduled by the DCI. The beam failure recovery response information may also be one of the following information: the method comprises the steps of DCI scrambled by a cell radio network temporary identifier C-RNTI, DCI scrambled by a modulation coding mode cell specific radio network temporary identifier MCS-C-RNTI, DCI of downlink control information in a special search space, DCI scrambled by a special radio network temporary identifier RNTI, DCI scrambled by a random access radio network temporary identifier RA-RNTI, DCI containing a preset state value, DCI containing transmission configuration indication TCI information, quasi co-location QCL indication information of a cell in which a wave beam fails or DCI indicating newly transmitted data. The embodiments of the present application do not limit this. It should be understood that the DCI indicating newly transmitted data and the DCI scheduling bearer beam failure request information resource have the same hybrid automatic repeat request (HARQ) process identifier (process identifier), and optionally, the New Data Indicators (NDIs) of the two DCIs are different. It should be understood that when the terminal device receives the beam failure recovery response information, the beam failure recovery is considered to be successful. It should be understood that after the beam failure recovery is successful, the terminal device may not send the beam failure recovery request information any more, may also stop or reset the counter of the beam failure detection, may also stop or reset the timer of the beam failure detection, may also stop or reset the beam failure recovery counter, may also stop or reset the beam failure recovery timer, and the like.

It should be understood that the names of the beam failure, the beam failure recovery request information, and the beam failure recovery response information in the embodiments of the present application may also be called as other names, and the present application is not particularly limited to this.

It should be understood that, in the present application, the beam failure recovery may be understood as that the terminal device does not send the beam failure recovery request information any more, may also be understood as stopping the timing of the beam failure recovery timer (or referred to as a clock), may also be understood as stopping the counting of the beam failure recovery counter, and the like.

It should be understood that in the embodiments of the present application, "beam" may be replaced with "link".

It should also be understood that in the present embodiment, "cell" may be understood as "serving cell" or "carrier.

Optionally, the cell includes at least one of a downlink carrier, an Uplink (UL) carrier, and a Supplemental Uplink (SUL) carrier. Specifically, a cell may include a downlink carrier and an uplink carrier; or the cell may include a downlink carrier and an uplink supplementary carrier; or the cell comprises a downlink carrier, an uplink carrier and an uplink supplementary carrier.

Optionally, the carrier frequency of the uplink supplemental carrier is lower than the uplink carrier, so as to improve uplink coverage.

Optionally, in general, in an FDD system, carrier frequencies of an uplink carrier and a downlink carrier are different; in the TDD system, the carrier frequencies of the uplink carrier and the downlink carrier are the same.

It should also be understood that, in the embodiment of the present application, the uplink resource is on an uplink carrier; the downlink resource is on a downlink carrier.

It should be further understood that, in the embodiment of the present application, the uplink carrier may be a normal uplink carrier, and may also be a Supplemental Uplink (SUL) carrier.

It should be understood that "detection" in the embodiments of the present application may be understood as "reception" and may also be understood as "decoding".

It should be understood that, in the present application, a time unit may be one or more radio frames, one or more subframes, one or more slots, one or more minislots (mini slots), one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols, etc. defined in the LTE or 5G NR system, and may also be a time window formed by a plurality of frames or subframes, such as a System Information (SI) window.

In the LTE system, the minimum time scheduling unit is a Transmission Time Interval (TTI) of 1ms duration. The 5G supports the time domain scheduling granularity of a time unit level, also supports the time domain scheduling granularity of a micro time unit, and meets the time delay requirements of different services. For example, time units are mainly used for eMBB traffic and micro-time units are mainly used for URLLC traffic. It should be noted that the time units and the micro time units are general terms, and a specific example may be that the time units may be referred to as slots, and the micro time units may be referred to as micro slots, non-slots (non-slot-based), or mini-slots (mini-slots); alternatively, a time unit may be referred to as a subframe, and a micro-time unit may be referred to as a micro-subframe; other similar time domain resource division modes are not limited. The first time unit described herein may refer to a timeslot or mini-timeslot, etc. For example, a slot may include, for example, 14 time domain symbols, and a mini-slot may include less than 14 time domain symbols, such as 2, 3, 4, 5, 6, or 7, etc.; or, for example, a timeslot may include 7 time domain symbols, and a mini timeslot includes time domain symbols less than 7, such as 2 or 4, and the specific value is not limited. The time domain symbols here may be OFDM symbols. For a timeslot with subcarrier spacing of 15 kilohertz (kHz), including 6 or 7 time domain symbols, the corresponding time length is 0.5 ms; for a time slot with a subcarrier spacing of 60kHz, the corresponding time length is shortened to 0.125 ms.

It should be understood that in the present application, "cell identification" may also be replaced by "cell index".

It should be understood that, in the embodiment of the present application, the beam failure case counter may also be referred to as a beam failure case indication counter, and may also be referred to as a beam failure detection counter.

It should be understood that, in various embodiments of the present application, the reference signal information may include a reference signal resource index and/or a channel quality of a reference signal. Wherein the channel quality may include one or more of: reference Signal Received Power (RSRP), signal to interference plus noise ratio (SINR), Reference Signal Received Quality (RSRQ), Channel Quality Indication (CQI), or signal to noise ratio (SNR), among others. It should be understood that, in the embodiments of the present application, the "reference signal information" may also be referred to as "reference signal resource information".

Communication systems typically use different kinds of reference signals: one type of reference signal is used to estimate the channel so that a received signal containing control information or data can be coherently demodulated; another type is used for measurement of channel state or channel quality, enabling scheduling of terminal devices. And the terminal equipment obtains the CSI based on the CSI-RS channel quality measurement. The CSI includes at least one of Rank Indicator (RI), Precoding Matrix Indicator (PMI), Channel Quality Indicator (CQI), and the like. The CSI information may be sent by the terminal device to the network device via PUCCH or PUSCH.

With the advent of intelligent terminals, particularly video services, it has been difficult for current spectrum resources to meet the explosive growth of users' demand for capacity. High frequency bands, particularly millimeter wave bands, having larger available bandwidths are increasingly becoming candidates for next generation communication systems. On the other hand, modern communication systems usually use multi-antenna technology to improve the capacity and coverage of the system or improve the user experience, and another benefit from using high frequency band is that the size of the multi-antenna configuration can be greatly reduced, thereby facilitating site acquisition and deployment of more antennas. However, unlike the working frequency band of the existing LTE system, the high frequency band will cause larger path loss, and especially the influence of factors such as atmosphere and vegetation will further increase the loss of wireless propagation.

To overcome the large propagation loss, a signal transmission mechanism based on beamforming technology is adopted to compensate the loss in signal propagation process by large antenna gain. The beamformed signals may include broadcast signals, synchronization signals, cell-specific reference signals, and the like.

When signals are transmitted based on the beam forming technology, once a user moves, the direction of a formed beam corresponding to the transmitted signals is not matched with the position of the moved user any more, so that the received signals are frequently interrupted. In order to track the change of the shaped beam in the signal transmission process, a channel quality measurement and result reporting based on the beam forming technology is introduced. The channel quality measurement may be based on a beamformed synchronization signal or a cell-specific reference signal. Compared with cell switching, the switching of users among different shaped beams is more dynamic and frequent, so a dynamic measurement reporting mechanism is needed. Optionally, similar to the reporting of CSI information, the reporting of the channel quality result of the shaped beam may also be sent to the network device by the terminal device through a PUCCH or a PUSCH.

The terminal equipment selects the N optimal wave beams by measuring the plurality of wave beams sent by the network equipment and reports the N optimal wave beam measurement information to the network equipment. The beam measurement information mainly includes reference signal resource index and reference signal quality information. The reference signal quality information may be at least one of channel quality information of the reference signal, such as a received power (L1-reference signal received power, L1-RSRP) of the reference signal, a signal to interference plus noise ratio (L1-signal to interference plus noise ratio, L1-SINR) of the reference signal, a signal to interference plus noise ratio (SINR) of the reference signal, or a Channel Quality Indication (CQI) of the reference signal.

In the transmission of downlink signals, both a network device transmitting beam and a terminal receiving beam may dynamically change, a plurality of better receiving beams determined by the terminal device based on the receiving signals may be included, in order to enable the terminal device to determine its own receiving beam, the terminal device may feed back information of the plurality of receiving beams to the network device, and the network device may indicate the terminal receiving beam to the terminal device by sending beam indication information to the terminal device. When the terminal equipment adopts the beam forming in the analog domain, the terminal equipment can accurately determine the terminal to receive the beam based on the beam indication information sent by the network equipment, so that the beam scanning time of the terminal equipment can be saved, and the effect of saving power is achieved. For example, the network device may indicate the reception parameters employed by the terminal device through QCL information configuring the PDCCH. Specifically, the QCL information configuration method of the PDCCH is as follows: the RRC configures K candidate QCL information of the PDCCH, such as K TCI states; the MAC-CE indicates QCL information of the PDCCH (when K > 1).

The protocol also provides that the network device can assume that the DMRS of PDCCH and PDSCH is QCL with the SSB determined at initial access before RRC and MAC-CE are not transmitted.

However, due to the occlusion in the communication process, the diffraction capability under the high-frequency channel is poor, so that the currently served beam is blocked, and the signal cannot be transmitted continuously. In order to prevent communication from being suddenly interrupted in the case of blocked beams, a corresponding mechanism needs to be introduced to detect the current link quality and quickly recover the link in the case of blocked beams.

In order to prevent a situation where a wireless signal is blocked to cause a sudden interruption of communication from occurring, the terminal device may measure the communication quality of a reference signal for beam failure detection configured by the network device to determine whether a beam failure occurs. Fig. 1 shows a schematic flow chart of a beam failure recovery procedure in the prior art, and as shown in fig. 1, the beam failure recovery procedure includes:

s101, the terminal device measures a reference signal resource set of beam failure detection, and determines beam failure between the terminal device and the network device.

In some embodiments, when the terminal device determines that the channel quality information of M consecutive beam failure detection reference signals or all or part of the reference signals in the beam failure detection reference signal resource set is less than or equal to the link failure detection threshold, the terminal device may determine that a beam between the terminal device and the network device fails. Specifically, there may be the following steps:

1. the terminal device measures the channel quality (also referred to as "signal quality") of the reference signals within the set of beam failure detection reference signal resources. For convenience of description, a reference signal within a set of beam failure detection reference signal resources may be referred to as q 0. When the channel quality of all or part of the reference signals in q0 in the beam failure case reporting period is less than or equal to the link failure detection threshold, the Physical (PHY) layer of the terminal device reports the beam failure case indication information to a Medium Access Control (MAC) layer.

The reporting period of the beam failure case is a period in which a Physical (PHY) layer reports beam failure case indication information to a Medium Access Control (MAC) layer.

It should be understood that the reference signal resource in q0 satisfies a QCL relationship with the CORESET/PDCCH of the SCell in which the reference signal is configured (the beam failure detection reference signal resource and CORESET may be in a one-to-one relationship, or a many-to-one relationship, or a one-to-many relationship). For example, DMRSs of reference signals and a PDCCH in a beam failure detection reference signal resource set satisfy a quasi co-location (QCL) relationship or have the same TCI state as the PDCCH.

2. If the terminal device detects N consecutive beam failure cases (it can also be understood that the MAC layer receives N beam failure case information when the beam failure detection timer runs), the terminal device determines that the current SCell has a beam failure.

Wherein, N is configured by a beam failure detection parameter (which may be a beamfailure probability max count parameter configured by RRC signaling or MAC-CE signaling).

Whether the N times of beam failure cases are continuous or the count of the N times of beam failure cases is controlled by a beam failure detection timer (which may be a beamfailure detectiontimer parameter configured by RRC signaling or MAC-CE signaling) in the beam failure detection parameter.

The reporting period of the beam failure case is the period of the reference signal with the minimum period in q0 and the maximum value in 2 ms. The length of the beam failure detection timer is integral multiple of the reporting period of the beam failure case.

The terminal device maintains a beam failure case COUNTER (BFI-COUNTER) with an initial value of 0. If the MAC layer of the terminal device receives the beam failure instance indication information (beam failure instance indication) transmitted by the PHY layer, the terminal device starts or restarts the beam failure detection timer and increments the BFI-COUNTER by one. And when the BFI-COUNTER counting value is larger than or equal to N, determining that the SCell fails to generate the beam.

If the beam failure detection timer times out, or if any one of the beam failure detection parameters is reconfigured by the higher layer signaling, the BFI-COUNTER is set to 0. If the beam failure recovery is successful, the BFI-COUNTER is also set to 0, and the beam failure detection timer is stopped.

The beam Failure Detection parameters include a beam Failure Detection reference signal resource (beam Failure Detection Resources or Radio Link Monitoring RS), a beam Failure Instance maximum number (beam Failure Detection Max Count) N, and a beam Failure Detection timer (or the duration of the beam Failure Detection timer). Illustratively, as shown in fig. 2, a schematic diagram of beam failure detection is shown. Where q0 is assumed to be the set of reference signal resources used for beam failure detection for one cell. The reference signal resource in q0 includes CSI-RS1 (with a period of 5ms) and SSB1 (with a period of 5ms), then the Beam Failure Instance (BFI) indication interval (or referred to as beam failure instance reporting period) is equal to 5 ms. The set of reference signal resources for beam failure detection may be referred to simply as a set of beam failure detection reference signal resources (BFD RS). The BFD RS set may be a reference signal resource set configured for beam failure detection through RRC signaling or MAC-CE signaling display of the network device, or may be implicitly obtained through a reference signal resource indicated by type D QCL information in the TCI state of CORESET (that is, the reference signal resource indicated by type D QCL information in the TCI state of CORESET is used as a beam detection reference signal resource, and optionally, the TCI state is an activated TCI state of CORESET). In addition, the network device may configure the maximum number of beam failure instances (e.g., the maximum number of beam failure instances is 3) and the beam failure detection timer through RRC signaling or MAC CE signaling. The beam failure detection timer is an integer multiple of the beam failure case reporting period (e.g., the beam failure detection timer is equal to the beam failure case reporting period). The terminal device maintains a beam failure detection timer (BFD timer) and a beam failure case indicator counter (BFI counter). And when the BFI counter is greater than or equal to the maximum number of the beam failure cases, determining that the beam failure occurs in one cell. Wherein, the beam failure case is reported to a Medium Access Control (MAC) layer of the terminal device by a physical layer (PHY) of the terminal device. As can be seen from fig. 2, when BFI is reported 3 times continuously from 10ms to 25ms, the signal quality of CSI-RS1 and SSB1 in each BFI interval is less than the first threshold, and therefore, the terminal device determines that the beam of the cell fails according to the 3 BFI. The reference symbol "X" indicates that the signal quality of the reference signal is below the first threshold.

By way of example, fig. 3 shows a schematic diagram of another beam failure detection. Where q0 is assumed to be the set of reference signal resources used for beam failure detection for one cell. The reference signal resources in q0 include CSI-RS1 (with a period of 5ms) and SSB1 (with a period of 10 ms); the BFI indication interval is equal to 5 ms. The network device may configure, through RRC signaling or MAC CE signaling, a maximum number of beam failure cases (e.g., the maximum number of beam failure cases is 3), and a beam failure detection timer, where the beam failure detection timer is an integer multiple of a beam failure case reporting period (e.g., the beam failure detection timer is equal to the beam failure case reporting period). As can be seen from fig. 3, when BFI is reported 3 times continuously from 10ms to 25ms, the signal quality of CSI-RS1 and SSB1 in each BFI interval is less than the first threshold, and therefore, the terminal device determines that the beam of the cell fails according to the 3 BFI. The reference symbol "X" indicates that the signal quality of the reference signal is below the first threshold.

Fig. 2 and 3 differ in that all beam failure detection reference signals (CSI-RS1 and SSB1) are included in one BFI interval in fig. 2. In fig. 3, all of the beam failure detection reference signals (e.g., 10ms to 15ms) may be included in one BFI interval, and only a part of the beam failure detection reference signals (e.g., 15ms to 20ms) may be included in another BFI interval.

By way of example, fig. 4 shows a beam failure detection scheme.

As shown in fig. 4 (a), the beam failure detection timer is equal to 2 times of the beam failure case reporting period (i.e., the duration of the beam failure timer is 10ms), and the beam failure timer (BFD timer) of the MAC layer is started or restarted after receiving the BFI. Restarting the BFD timer after receiving the BFI in 5ms, and adding 1 to the BFI counter; when the BFI is received in the running period (between 5ms and 15ms) of the BFD timer, the BFI counter is accumulated by 1 again, namely the BFD counter value is 2 at 15 ms; and the UE MAC receives BFI again at 20ms, the value of the BFI counter is 3, and the terminal equipment determines that the cell has beam failure.

As shown in fig. 4 (b), the beam failure detection timer is equal to the beam failure case reporting period (i.e., the duration of the beam failure timer is 5ms), and the beam failure timer (BFD timer) of the MAC layer is started or restarted after receiving the BFI. Restarting the BFD timer after receiving the BFI in 5ms, and adding 1 to the BFI counter; when the BFD timer runs out of time, the BFI counter is clear 0; when 15ms, the UE MAC receives BFI, the BFD timer is restarted, and the BFI counter is added with 1; when the time is 20ms, the UE MAC receives BFI again, and the BFI counter is added with 1 to obtain a value of 2; and when the time is 25ms, the UE MAC receives BFI again, the BFI counter adds 1, the value is 3, and the terminal equipment determines that the wave beam failure occurs in the cell.

The MAC layer of the terminal device may add 1 to the BFI counter when receiving the BFI during the operation of the beam failure detection timer, and reset/clear the BFI counter if the BFI is not received during the operation of the beam failure detection timer (i.e., reset/clear the BFI counter when the beam failure detection timer times out). Therefore, the BFI coutner has a slightly different counting method for different values (or different durations) of the beam failure timer. The difference between (a) in fig. 4 and (b) in fig. 4 is that the beam failure detection timer in (a) in fig. 4 is equal to 2 times the beam failure case reporting period. The beam failure detection timer in fig. 4 (b) is equal to the beam failure case reporting period, so that for the same channel condition, different values of the beam failure detection timer may have a method for counting the BFI counter, for example, values of the BFI counters in the two diagrams at certain times are different.

It should be understood that, in this embodiment, the manner in which the terminal device determines that a link on a certain carrier between the terminal device and the network device fails is not limited to the above example, and may also be determined by other determination manners, which is not limited in this application.

It should be understood that the terminal device determines that a beam on a certain carrier between the terminal device and the network device fails, and may be understood as that the terminal device determines that a link on a certain carrier between the terminal device and the network device fails.

And S102, the terminal equipment identifies the new link.

The terminal device may measure the reference signals in a certain set of reference signal resources and identify the reference signals for recovering the link between the terminal device and the network device. Generally, the channel quality of the reference signal used to recover the link between the terminal device and the network device needs to be greater than or equal to the link failure recovery threshold. The reference signal may be referred to simply as the first reference signal or the new beam. The first reference signal may be one reference signal or may also be a plurality of reference signals. The multiple reference signals may be used to recover the link of carriers. Each of the plurality of reference signals may be used to recover a carrier configuring the reference signal. Alternatively, the plurality of reference signals may be used to recover the element carriers configuring the plurality of reference signals.

In some embodiments, the terminal device may identify reference signals in a candidate set of reference signal resources (candidate beam identification RS sets). The terminal device may recover the link based on the reference signal. Optionally, the channel quality of the identified reference signal is greater than or equal to a beam failure recovery threshold. The process of identifying the reference signal by the terminal device may be understood as determining, by the terminal device, a reference signal (which may be referred to as a new identified beam or a new beam for short) whose channel quality is greater than or equal to a beam failure recovery threshold in the candidate reference signal resource set; the determination process herein may be determined by measuring channel quality information of the candidate set of reference signal resources.

It should be appreciated that in one possible scenario, the terminal device may not identify a reference signal (new identified beam) having a channel quality greater than or equal to the beam failure recovery threshold. In another possible case, the terminal device does not perform step S102.

S103, the network equipment configures or indicates PUSCH resources for the terminal equipment.

And S104, the terminal equipment receives the configuration or information indicating the PUSCH resource sent by the network equipment.

It should be understood that, for convenience of description, the PUSCH resource configured for the terminal device by the network device is simply referred to as the second resource.

The specific indication manner of the second resource may be one or more of the following manners:

mode 1: the terminal equipment sends the first request information to request the second resource. The second resource may be a PUSCH resource indicated by the network device through an uplink grant (or DCI). The uplink grant (or DCI) may be a DCI with a CRC scrambled by a C-RNTI/MCS-C-RNTI.

In one implementation, the first request message indicates a link failure event and is carried on a PUCCH resource or a PRACH resource. In another implementation, the first request message may be used to request an uplink resource and is carried on a PUCCH resource or a PRACH resource. The first request information may also be referred to as scheduling request information.

It should be understood that the terminal device transmitting the first request message may be performed after step S101 and before step S104.

Specifically, the terminal device sends first request information.

The first request information may also be referred to as scheduling request information or the first request information and the scheduling request information are in the same format. The first request information may be used to request a resource for carrying the second request information (referred to as a second resource for short).

It is to be understood that the second resource may be indicated or activated by the response information of the first request information.

Specifically, in one embodiment, after receiving the first request message, the network device may further send a response message of the first request message.

The response information of the first request information may be used to indicate the second resource allocated to the terminal, that is, the network device allocates the resource to the terminal. The second resource may be an aperiodic resource (or referred to as a dynamic resource), in the method, the network device determines whether to allocate the second resource according to whether there is a cell with beam failure in the current network (indicated by the first request information), and if the network device receives the first request information, it may know that there is a cell with beam failure in the current network, and the network device may dynamically allocate the second resource, so that the terminal device further reports which cells have beam failure, and/or reports information of recovering a new link of the cell with beam failure. Because the wave beam failure event is an emergency event, the method does not need to reserve the periodic resource for sending the wave beam failure recovery request information in advance, and can effectively save the resource overhead.

In another embodiment, the response information of the first request message may also be used to activate a second resource, that is, a second resource originally allocated to the terminal, and the activation is triggered by the response information of the first request message, where the activated second resource is a semi-persistent resource (semi-persistent) or a persistent resource (persistent). For example, the second resource may be a semi-static resource or a static resource (e.g., PUSCH, PUCCH, or Physical Random Access Channel (PRACH)) activated by response information of the first request information after the first request information or DCI signaling after the first request information. In the method, the network device determines whether to activate the second resource according to whether a cell with a link failure (indicated by the first request information) exists in the current network, and if the network device receives the first request information, it can know that the cell with the beam failure exists in the current network, and the network device activates the second resource, so that the terminal device further reports which cells have the beam failure and/or reports information of a new link for recovering the cell with the link failure.

Optionally, the second resource may be configured by higher layer signaling or system information, or be a preset resource.

Specifically, the second resource may be configured for the terminal by the network device and sent to the terminal through higher layer signaling or system information. The second resource may also be pre-agreed by the network device and the terminal device, or set by the terminal in advance, which is not limited in this application.

Optionally, the second resource may also be a resource having an association relationship with the resource for carrying the first request information.

Specifically, the second resource may have a mapping relationship with a resource used for carrying the first request information, so that the terminal may determine the second resource when knowing the resource used for carrying the first request information. Optionally, the association relationship between the resource for carrying the first request information and the second resource may be configured by system information such as a Master Information Block (MIB) or a System Information Block (SIB), or configured by Radio Resource Control (RRC) or Medium Access Control (MAC) -Control Element (CE) signaling. The system information or signaling may be sent prior to sending the first request information. Optionally, the configuration of the resource for carrying the first request information and the second resource may also be configured through the system information or the signaling. The method can directly send the second request information on the second resource without sending the second request information through the resource allocated by the response information of the first request information, thereby effectively reducing the beam recovery time delay and improving the beam recovery speed.

It should be noted that, the network device may configure a plurality of resources for the terminal device to transmit the first request information and configure a plurality of resources for the terminal device to transmit the second request information, and the terminal device may select one or more resources from the plurality of resources for transmitting the first request information to send the first request information, and may also select one or more resources from the plurality of resources for transmitting the second request information as the second resources. The plurality of resources for transmitting the first request information and the plurality of resources for transmitting the second request information may be configured by the system information such as the MIB or SIB, or configured by signaling such as RRC or MAC-CE, respectively.

Optionally, the second resource may also be a resource associated with the first request information. Optionally, the network device may configure, through system information such as MIB or SIB, or through RRC or MAC-CE signaling, a plurality of resources for transmitting the first request information and a plurality of resources for transmitting the second request information, and an association relationship between the plurality of resources for transmitting the first request information and the plurality of resources for transmitting the second request information, and the terminal may select one of the plurality of resources for transmitting the first request information to transmit the first request information, and may also select one of the plurality of resources for transmitting the second request information as the second resource. One or more second resources may be associated with each resource for transmitting the first request information, and the second resources associated with each resource for transmitting the first request information may be different in size. In which resource the terminal device sends the first request information, the terminal device sends the second request information on a second resource associated with the resource sending the first request information.

It is to be understood that the second resource may be a PUSCH resource or may be a PUCCH resource.

It should be understood that the second request information of the embodiment may be a MAC-CE indicating cell information of the beam failure cell. The response information of the first request information may be DCI information.

The second request information may include identification information of the beam failed cell and/or reference signal information of the recovery beam failed cell. Or, the cell information of the beam failed cell may include identification information of the beam failed cell and/or reference signal information of the recovery beam failed cell. The reference signal information of the cell with failed beam recovery may be an index of the reference signal resource, and/or channel quality information of the reference signal resource (such as one or more of RSRP, SINR, RSRQ, CQI, etc. below).

Mode 2: the second resource may also be a PUSCH resource indicated directly by the network device through an uplink grant (or DCI). The uplink grant (or DCI) may be a DCI with a CRC scrambled by a C-RNTI/MCS-C-RNTI.

For

modes

1 and 2, the second resource may be a resource dynamically allocated by the network device. The method does not need to reserve periodic resources in advance, and can effectively save the resource overhead.

Mode 3: the second resource may be a semi-static resource (semi-persistent) or a static resource (periodic) that the network device activates through RRC or MAC-CE or DCI. For example, the second resource may be a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), or a Physical Random Access Channel (PRACH).

Mode 4: the second resource may be configured by the configuration information or be a preset resource.

Alternatively, the configuration information may be configured by system information such as a Master Information Block (MIB) or a System Information Block (SIB), or configured by Radio Resource Control (RRC) or Medium Access Control (MAC) -Control Element (CE) signaling. The configuration information may be configurable grant configured.

Mode 5: the second resource may be a PUSCH resource associated with a PRACH or a PUCCH. Alternatively, the second resource may be a PUSCH resource in a 2step PRACH. Understandably, the network device configures the PRACH resource and the PUSCH resource with an association relationship, and the PUSCH resource does not need DCI indication. In one implementation, the terminal device selects one PRACH resource to initiate a random access procedure, and sends other information (e.g., a UE ID) on a PUSCH resource associated with the PRACH resource. In another implementation, the PRACH resource or the PUCCH resource is a resource that carries the first request information. The first request information is described in manner 1, and is not described herein again.

With regard to

methods

3, 4 and 5, the configuration information indicating the second resource by the network device may be sent in advance, where the configuration information may be sent to the terminal device by the network device before determining that the beam fails, and then the terminal device directly sends the beam failure recovery request information on the resource after finding the beam failure without waiting for the network device to allocate the PUSCH resource.

S105, the terminal equipment sends beam failure recovery request information to the network equipment.

The beam failure recovery request information is associated with a reference signal (new identified beam or new beam) whose channel quality is greater than or equal to the beam failure recovery threshold, which is identified in S102, and the terminal device may notify the network device of the new identified beam or the reference signal resource in a display manner or an implicit manner. For example, for the display mode, the terminal device may report the resource index or the resource identifier display of the newly identified reference signal to the network device. For example, for an implicit mode, the network device configures association relations between a plurality of uplink resources for transmitting BFRQ information and a plurality of candidate reference signal resources in advance, and the terminal device implicitly indicates to newly identify the reference signal resources by selecting the uplink resources for transmitting BFRQ.

The terminal device may also report at least one of new beam (new beam) information, cell identifiers of beam failures, and the like through one or more beam failure recovery request messages. And may also be understood as BFRQ indicating one or more of new beam information, cell identification of beam failure, beam failure event.

It should be understood that, in this embodiment, the terminal device may send a BFRQ to the network device, and recover the beam failure between the terminal device and the network device through the network device, or the terminal device may send a BFRQ to another network device, and recover the beam failure between the terminal device and the network device through the other network device.

The BFRQ information of the PCell in the NR can be reported through the PRACH resource. The base station configures one or more PRACH resources, and configures each PRACH resource to be associated with a reference signal, wherein the reference signal is a reference signal used for recovering link failure. The reference signal may be a reference signal in a candidate reference signal resource set configured by a base station. And the terminal equipment confirms the failure of the beam, identifies the new beam and selects the PRACH resource associated with the new beam to transmit the signal. In this way, the terminal device can implicitly indicate the new beam information.

For example, an uplink resource set configured for the first cell by the network device for transmitting the beam failure request information of the first cell is referred to as a first uplink resource set. The number of Physical Random Access Channel (PRACH) resources included in the first uplink resource set is equal to the number of downlink reference signals in the candidate reference signal resource set of the first cell, that is, one PRACH resource is associated with one downlink reference signal. The terminal equipment identifies the reference signal which is greater than or equal to the beam failure recovery threshold in the candidate reference signal resource set, and sends the beam failure recovery request information on the PRACH resource associated with the reference signal. Optionally, when there is reciprocity between uplink and downlink, a transmission beam when the terminal device transmits information on one PRACH resource is a transmission beam corresponding to a reception beam of a downlink reference signal associated with the PRACH resource, that is, the terminal device may transmit information on the PRACH resource by using the transmission beam corresponding to the reception beam. When there is no reciprocity between uplink and downlink, an optional implementation manner is that, in the first uplink resource set, one PRACH resource is associated with one downlink reference signal and one uplink reference signal, and the terminal device may further determine, according to the PRACH resource associated with the determined downlink reference signal, the uplink reference signal associated with the PRACH resource, so as to transmit information on the PRACH resource by using a transmission beam of the uplink reference signal.

And the BFRQ information of the SCell in the NR can be reported in one step. The BFRQ information may be carried on PUSCH resources; may also be carried on PUCCH resources; wherein the BFRQ information may indicate a cell identity for a beam failure, and/or new beam information.

The BFRQ message may also be reported in two steps, BFRQ1+ BFRQ 2. The BFRQ1 may be carried on PUCCH resources or PRACH resources, and the BFRQ2 may be carried on PUSCH resources or PUCCH resources. In one implementation, BFRQ1 indicates a beam failure event, and BFRQ2 indicates cell identification and/or new beam information for the beam failure. In another implementation, BFRQ1 indicates a beam failure event and/or cell identification of a beam failure, and BFRQ2 indicates new beam information.

It should be understood that the BFRQ information described above is carried on PUSCH resources, which may be understood as reporting BFRQ information through MAC-CE.

Optionally, a Media Access Control (MAC) layer of the terminal device may maintain a beam failure recovery timer (beam failure recovery timer) and a beam failure recovery counter (beam failure recovery counter). The beam failure recovery timer is used for controlling the time of the whole beam failure recovery, and the beam failure recovery counter is used for limiting the times of sending the beam failure recovery request information by the terminal equipment. And when the beam failure recovery counter reaches the maximum value, the terminal equipment considers that the beam failure recovery is unsuccessful, and stops the beam failure recovery process. The recovery time of the recovery timer and the count value of the recovery counter may be configured by the network device, or may be preset values.

S106, the network equipment receives the beam failure recovery request information sent by the terminal equipment.

In some embodiments, after receiving the beam failure recovery request information, the network device may further send a beam failure recovery response to the terminal device, and the terminal device receives the beam failure recovery response, that is, performs S107 and S108.

The terminal device can detect DCI scrambled by C-RNTI or MCS-C-RNTI in a control resource set (CORESET) and a search space set (search space set) as BFRR.

The core space set and/or the search space set may be a dedicated core space set and/or a search space set configured by the network device for the terminal device, and are used for the network device to send the downlink control resource of the response information to the beam failure recovery request information after the terminal device sends the link failure request.

It should also be understood that, in this embodiment, the time sequence of S101 and S102 in the beam failure recovery flow is not limited, S102 may precede S101, S101 may precede S102, or S102 and S101 may be performed simultaneously. It should also be understood that S107 and S108 are optional steps.

In general, a network device may configure a terminal device with multiple cells (e.g., a primary cell and/or a secondary cell) and beam failure detection parameters for each cell, where the beam failure detection parameters include a BFDRS, a beam failure detection timer, and a maximum number of beam failure cases. The terminal device may also report the number of cells whose most supported Beam Failure Recovery (BFR) is to the network device. The terminal device performs beam failure detection on each cell independently according to the beam failure detection parameters, and at this time, the terminal device needs to detect multiple beam failure detection reference signal resources, and also needs to maintain multiple beam failure detection timers and beam failure detection counters, so that the implementation complexity of the terminal device is high. In addition, if the terminal device determines that the times of the beam failures occurring in each cell are different, frequent transmission of beam failure recovery request (BFRQ) information may be caused, thereby causing resource waste.

In order to solve the above problem, an embodiment of the present application provides a beam failure detection method, including: firstly, grouping a plurality of cells according to the space related parameter information, and carrying out beam failure detection on any cell group according to the beam failure detection parameters of the cell group, wherein the beam failure detection parameters of the cell group can be determined according to the beam failure detection parameters of the cells contained in the cell group. Therefore, because the cells with the same beam direction are divided into one group, the beam failure detection can be carried out on all the cells in the cell group through one beam failure recovery process, thereby effectively reducing the realization complexity of carrying out the beam failure detection on a plurality of cells by the terminal equipment; in addition, the beam failure recovery request information of a plurality of cells is transmitted through one MAC-CE, so that the resource overhead of transmitting the beam failure recovery request information is effectively saved.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), an LTE system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a universal microwave access (WiMAX) communication system, a future fifth generation (5G) mobile communication system or a New Radio (NR), etc., the 5G mobile communication system described in the present application includes a non-standalone (NSA) 5G mobile communication system and/or a Standalone (SA) 5G mobile communication system. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation mobile communication system. The communication system may also be a PLMN network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, an IoT network, or other network.

Fig. 5 is an architecture diagram of a communication system to which an embodiment of the present application is applied. As shown in fig. 5, the communication system 500 includes a network device 510 and a terminal device 520. The terminal device 520 is connected to the network device 510 in a wireless manner. Fig. 5 is a schematic diagram, and the communication system may further include other devices, such as a core network device, a wireless relay device, and a wireless backhaul device, which are not shown in fig. 5. The core network device and the network device may be separate physical devices, or the function of the core network device and the logic function of the network device may be integrated on the same physical device, or a physical device may be integrated with a part of the function of the core network device and a part of the function of the network device. The terminal equipment may be fixed or mobile. The embodiments of the present application do not limit the number of terminal devices, core network devices, radio access network devices, and terminal devices included in the communication system.

The communication system 500 is in a single Carrier Aggregation (CA) scenario, the communication system 500 includes a network device 510 and a terminal device 520, the network device 510 and the terminal device 520 communicate through a wireless network, and when the terminal device 520 detects that a link between the network device 510 and the terminal device 520 fails, the terminal device 520 sends a BFRQ to the network device 510. Optionally, after receiving the BFRQ, the network device 510 sends a Beam Failure Recovery Response (BFRR) or a reconfiguration link to the terminal device 520.

It should be understood that one or more cells may be included under network device 510 in fig. 5. For example, the network device may include a first cell and a second cell, and if a link between the terminal device and the network device in the second cell fails, the first cell may assist the second cell in performing link recovery, for example, the terminal device may send the BFRQ information to the network device on an uplink resource belonging to the first cell, and the terminal device may receive the BFRR information sent by the network device on a downlink resource belonging to the second cell.

When the transmission direction of the communication system 500 is uplink transmission, the terminal device 520 is a transmitting end, and the network device 510 is a receiving end, and when the transmission direction of the communication system 500 is downlink transmission, the network device 510 is a transmitting end, and the terminal device 520 is a receiving end.

Fig. 6 is a communication system 600 to which the present application is applicable. The communication system 600 is in a Dual Connectivity (DC) or coordinated multipoint transmission/reception (CoMP) scenario, the communication system 600 includes a network device 610, a network device 620, and a terminal device 630, where the network device 610 is a network device at the time of initial access of the terminal device 630 and is responsible for RRC communication with the terminal device 630, and the network device 620 is added during RRC reconfiguration and is used to provide additional radio resources. The terminal device 630 configured with carrier aggregation is connected to the network device 610 and the network device 620, a link between the network device 610 and the terminal device 630 may be referred to as a first link, and a link between the network device 620 and the terminal device 630 may be referred to as a second link.

When both network device 610 and network device 620 may configure an uplink resource for transmitting a BFRQ to terminal device 630, and when the first link or the second link fails, terminal device 630 may send a BFRQ to network device 610 or network device 620 on the uplink resource for transmitting the BFRQ, and after receiving the BFRQ, network device 610 or network device 620 sends a BFRR to terminal device 630.

In particular, if the network device 620 is not configured with uplink resources for transmitting BFRQ, the terminal device 630 may recover the second link via the network device 610 when the second link fails.

The above-mentioned communication system applicable to the present application is only an example, and the communication system applicable to the present application is not limited thereto, for example, the number of network devices and terminal devices included in the communication system may also be other numbers, or a single base station, a multi-carrier aggregation scenario, a dual-link scenario, or a device to device (D2D) communication scenario may be adopted.

It should be understood that the technical solution of the embodiment of the present application may be applied to a cell assisting another cell or multiple cells in a carrier aggregation scenario to recover a link. Or under the double-link scene, one cell in one cell group assists another cell or a plurality of cells to recover the link.

It should be understood that the technical solution of the embodiment of the present application may also be applied to a single carrier or carrier aggregation or dual link scenario, where a cell fails to recover a beam of the cell on resources of the cell.

It should be understood that the technical solution in the embodiment of the present application may be applicable to a case where the primary cell (Pcell) is high frequency or low frequency and the secondary cell (Scell) is high frequency or low frequency, for example, when the Pcell is low frequency, the Scell is high frequency. In a possible implementation manner, for an Scell without uplink resource configuration, the uplink resource of the Pcell may be used to assist the Scell in recovering a link. Typically, the low and high frequencies are relative and may be bounded by a particular frequency, such as 6 GHz.

It should be understood that the technical solution of the embodiment of the present application may also be applied to a coordinated multipoint transmission/reception (CoMP) scenario, where one TRP assists another TRP in recovering a link. The CoMP may be one or more of non-coherent joint transmission (NCJT), Coherent Joint Transmission (CJT), Joint Transmission (JT), and the like.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearing formula smart machine, is to use wearing formula technique to carry out intelligent design, develop the general term of the equipment that can wear to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

In addition, in the embodiment of the present application, the terminal device may also be a terminal device in an internet of things (IoT) system, where IoT is an important component of future information technology development, and a main technical feature of the present application is to connect an article with a network through a communication technology, so as to implement an intelligent network with interconnected human-computer and interconnected objects. In the embodiment of the present application, the IOT technology may achieve massive connection, deep coverage, and power saving for the terminal through, for example, a Narrowband (NB) technology.

In addition, in this embodiment of the application, the terminal device may also be a terminal device in a car networking system.

In addition, in this embodiment of the application, the terminal device may further include sensors such as an intelligent printer, a train detector, and a gas station, and the main functions include collecting data (part of the terminal device), receiving control information and downlink data of the network device, and sending electromagnetic waves to transmit uplink data to the network device.

The network device in this embodiment may be a device for communicating with a terminal device, where the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved NodeB (eNB) or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, and the like, and the present embodiment is not limited.

The network device in this embodiment may be a device in a wireless network, for example, a Radio Access Network (RAN) node that accesses a terminal to the wireless network. Currently, some examples of RAN nodes are: a base station, a next generation base station gNB, a Transmission Reception Point (TRP), an evolved Node B (eNB), a home base station, a baseband unit (BBU), or an Access Point (AP) in a WiFi system. In one network configuration, a network device may include a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or a RAN device including a CU node and a DU node.

The application is mainly applied to a 5G NR system. The present application can also be applied to other communication systems, as long as the existing entity in the communication system needs to send the indication information of the transmission direction, and another entity needs to receive the indication information and determine the transmission direction within a certain time according to the indication information. Fig. 7 is a diagram illustrating an example of a communication system according to an embodiment of the present application. As shown in fig. 7, the base station and the terminal apparatuses 1 to 6 constitute a communication system. In this communication system, terminal apparatuses 1 to 6 can transmit uplink data to a base station, and the base station receives the uplink data transmitted from terminal apparatuses 1 to 6. The base station may transmit downlink data to the terminal apparatuses 1 to 6, and the terminal apparatuses 1 to 6 may receive the downlink data. Further, the terminal apparatuses 4 to 6 may constitute one communication system. In the communication system, terminal device 5 may receive uplink information transmitted by terminal device 4 or terminal device 6, and terminal device 5 may transmit downlink information to terminal device 4 or terminal device 6.

The network equipment and the terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons and satellite vehicles. The embodiment of the application does not limit the application scenarios of the network device and the terminal device.

The network device and the terminal device may communicate with each other through a licensed spectrum (licensed spectrum), may communicate with each other through an unlicensed spectrum (unlicensed spectrum), or may communicate with each other through both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other through a frequency spectrum of 6 gigahertz (GHz) or less, through a frequency spectrum of 6GHz or more, or through both a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more. The embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.

In the embodiment of the present application, the time domain symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a single carrier-frequency division multiplexing (SC-FDM) symbol. The symbols in the embodiments of the present application all refer to time domain symbols, if not otherwise specified.

It can be understood that, in the embodiment of the present application, the PDSCH, the PDCCH, and the PUSCH are only used as examples of the downlink data channel, the downlink control channel, and the uplink data channel, and in different systems and different scenarios, the data channel and the control channel may have different names, which is not limited in the embodiment of the present application.

Next, a beam failure detection method will be described in detail. Fig. 8 is a flowchart of a beam failure detection method according to an embodiment of the present application. As shown in fig. 8, the method may include:

s801, the terminal device determines a first cell group.

The terminal device determines the first cell group, which may be understood as the terminal device determining the first cell group according to the spatial correlation parameter information.

It should be understood that "spatial related parameter information" may be alternatively described as "spatial related parameter", "spatial information", or "spatial parameter information" in the present application.

For example, the terminal device may divide M cells according to the spatial correlation parameter information, and determine at least one cell group, where M is an integer greater than or equal to 2. The first cell group may refer to any one of the divided cell groups. This embodiment will be described by taking the first cell group as an example. The first cell group may include N cells, N being an integer greater than or equal to 2.

It should be understood that M cells may be all cells configured by the network device to the terminal device; or, the M cells may be all secondary cells configured by the network device to the terminal device; or, the M cells are all cells which need to perform beam failure detection and/or beam failure recovery and are indicated to the terminal equipment by the network equipment; or, the M cells are all secondary cells which need to perform beam failure detection and/or beam failure recovery and are indicated to the terminal equipment by the network equipment; or, the M cells configure all cells of the beam failure detection parameters or beam failure recovery parameters for the terminal device by the network device; or, the M cells configure all the secondary cells of the beam failure detection parameter or the beam failure recovery parameter for the terminal device by the network device.

In one possible implementation, the N cells may include a primary cell and a secondary cell.

In another possible implementation, the N cells may include only secondary cells. It should be understood that "including only secondary cells" means "including secondary cells, not primary cells".

It should be appreciated that there are many possible implementations for determining the first group of cells from the spatially dependent parameter information, e.g. at least two of the N cells are associated with the same spatially dependent parameter information. Or any two cells in the N cells are associated with the same spatial correlation parameter information. Or, each of the N cells is associated with the same spatial correlation parameter information.

Next, a possible implementation manner of determining the first cell group by the terminal device according to the spatial correlation parameter information will be described in detail.

In a possible implementation manner, the spatial correlation parameter information may refer to QCL information, and the terminal device may determine the first cell group according to the QCL information.

In some embodiments, the QCL information may be QCL information of type D.

In other embodiments, the QCL information may be QCL information of type a.

In other embodiments, the QCL information may be QCL information of type D and type a.

If the QCL information of the control resource set of one cell is the same as that of the other cell, the two cells are grouped into one cell group. Or QCL information of the control resource set of each cell within one cell group is the same.

The control resource set of one cell may refer to a control resource set over all Bandwidth areas (BWPs) of one cell. Alternatively, the set of control resources of one cell may refer to a set of control resources on the active BWP of one cell.

It should be understood that, in this embodiment, the QCL information of the control resource set of one cell means that the terminal device detects a PDCCH (or referred to as DCI) on the control resource set of the one cell according to the QCL information. Or, the one cell is referred to as a target cell, the PDCCH on the control resource set is referred to as a target signal, the QCL information indicates one source reference signal resource, and the terminal device receives or demodulates the target signal on the target cell using the same or similar spatial parameters as the source reference signal resource.

It should be understood that, in this embodiment, the QCL information being the same may mean that the QCL information of the transmission indication status indication is the same. The QCL information may include a reference signal resource index and a QCL type. The QCL information may also include one or more of a cell index and BWP identification. Wherein the cell index indicates a cell where a reference signal resource corresponding to the reference signal resource index is located, and the BWP identifier indicates a location of the BWP of the cell. When the cell index and the BWP identity are not included in the QCL information, the reference signal resources indicated by the default QCL information are on the target cell.

It should be understood that the QCL information is the same, which may mean that the reference signal resource indexes included in the QCL information are the same. The QCL information is the same, and may also refer to the same cell index, the same BWP identity, and the same QCL type. Or, the QCL information is the same, which may mean that frequency domain locations of the reference signal resources indicated by the QCL information are the same. Or, the QCL information is the same, which may mean that the reference signal resources indicated by the QCL information are the same. The reference signal resources are the same, which means that the reference signal resource indexes are the same, the cells in which the reference signal resources are located are the same, and the BWPs in which the reference signal resources are located are the same.

In some embodiments, the terminal device may determine cells in which QCL information of the control resource set is the same as the first cell group. It should be appreciated that the manner in which the terminal device determines the first cell group may be one of the following.

In a first possible implementation, the terminal device may determine at least two cells that are the same as the QCL information of the at least one control resource set as the first cell group. The first cell group includes N cells, N being an integer greater than or equal to 2. A detailed description will be given below of a specific implementation in which at least two cells in the first cell group have the same information as the at least one QCL.

In the first mode, the terminal device determines at least two cells with the same QCL information as the first cell group. Or, at least two of the N cells are associated with the same QCL information.

For convenience of description, the configuration relationship is represented by CC # x-CORESET # a-QCL information # b. The CC # x includes a CORESET # a, and the QCL information of the CORESET # a is QCL information # b. That is, CC identified as x has CORESET identified as a, and QCL information corresponding to CORESET identified as a is TCI state identified as b. If the network device is configured to the terminal devices CC #1, CC #2, and CC #3, all the CORESET and corresponding QCL information included in the three CCs are configured as follows.

For example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all the CORESET and its corresponding QCL information included in the three CCs are configured as follows.

As shown in fig. 9, CC #1 has one CORESET #1, CORESET #2, and CORESET # 3. The QCL information of the CORESET #1 is QCL information #1, the QCL information of the CORESET #2 is QCL information #2, and the QCL information of the CORESET #3 is QCL information # 3. CC #2 has CORESET # 5. Wherein, the QCL information of the CORESET #5 is QCL information # 1. CC #3 has CORESET # 6. Wherein, the QCL information of the CORESET #6 is QCL information # 2.

If QCL information #1 of CC #1 and QCL information #1 of CC #2 indicate the same QCL information, and QCL information #2 of CC #1 and QCL information #2 of CC #3 indicate the same QCL information, CC1#1, CC #2, and CC #3 are grouped.

And in the second mode, the terminal equipment determines any two cells with the same QCL information as a first cell group. Or, any two cells in the N cells are associated with the same QCL information.

As shown in fig. 10, CC #1 has one CORESET #1 and CORESET # 2. The QCL information of the CORESET #1 is QCL information #1, and the QCL information of the CORESET #2 is QCL information # 2. CC #2 has CORESET #5 and CORESET # 6. The QCL information of the CORESET #5 is QCL information #2, and the QCL information of the CORESET #6 is QCL information # 3. CC #3 has CORESET #3 and CORESET # 7. The QCL information of the CORESET #3 is QCL information #1, and the QCL information of the CORESET #7 is QCL information # 3.

If QCL information #2 of CC #1 and QCL information #2 of CC #2 indicate the same QCL information, and QCL information #1 of CC #1 and QCL information #1 of CC #3 indicate the same QCL information, and QCL information #3 of CC #2 and CC #3 indicate the same QCL information, CC1#1, CC #2 and CC #3 are grouped.

And thirdly, the terminal equipment determines all the cells with the same QCL information as the first cell group. Or, each of the N cells is associated with the same QCL information.

As shown in fig. 11, CC #1 has one CORESET #1 and CORESET # 2. The QCL information of the CORESET #1 is QCL information #1, and the QCL information of the CORESET #2 is QCL information # 2. CC #2 has CORESET #5 and CORESET # 6. The QCL information of the CORESET #5 is QCL information #2, and the QCL information of the CORESET #6 is QCL information # 3. CC #3 has CORESET #3 and CORESET # 7. The QCL information of the CORESET #3 is QCL information #1, and the QCL information of the CORESET #7 is QCL information # 3.

If the QCL information #2 of CC #1 and the QCL information #2 of CC #2 indicate the same QCL information, the QCL information #1 of CC #1 and the QCL information #1 of CC #3 indicate the same QCL information. QCL information #3 of CC #2 and QCL information #3 of CC #3 indicate the same QCL information, and although QCLs of any two CCs may be the same, since there is no one piece of spatial correlation parameter information in each cell, CC1#1, CC #2, and CC #3 cannot be grouped into one group. Only two of the CCs may be divided into a cell group and the other CC itself may be a cell group. Optionally, at this time, the QCL information #2 may be grouped in order from small to large according to the CC index, for example, CC #1 and CC #2 may both be associated with QCL information #2 to form group #1, and CC #3 may not be associated with QCL information #2 to form group # 2.

In a second possible implementation, the terminal device may determine one or more cells associated with the same spatial correlation parameter information as the first cell group. It is to be understood that each of the N cells is associated with the same spatially dependent parameter information. A detailed description will be given below of a specific implementation manner in which each cell in the first cell group is associated with the same spatial correlation parameter information.

In a first manner, the terminal device may determine cells having the same QCL information set as the first cell group. Or, the QCL information sets of any two cells in the first cell group are the same. Wherein, any QCL information set is a set of QCL information of all control resource sets of the corresponding cell. Or, the QCL information sets of all cells in the first cell group are the same. Wherein, any QCL information set is a set of QCL information of all control resource sets of the corresponding cell.

It should be understood that all QCL information corresponding to all CORESET of one cell is identical to all QCL information corresponding to all CORESET of another cell. Any two cells in the first cell group do not include different QCL information.

For example, the network device is configured to the terminal devices CC #1 and CC #2, and all the CORESET and its corresponding QCL information included in the two CCs are configured as follows.

As shown in (a) of fig. 12, CC #1 has a CORESET #1, and QCL information of the CORESET #1 is QCL information # 1; CC #2 has CORESET #2, and QCL information of CORESET #2 is QCL information # 2.

If the QCL information #1 and the QCL information #2 indicate the same QCL information, the CC1#1 and the CC #2 are grouped.

For another example, as shown in (b) of fig. 12, CC #1 has one CORESET #1, and QCL information of the CORESET #1 is QCL information #1 and QCL information # 2; CC #2 has CORESET #2, and QCL information of CORESET #2 is QCL information #1 and QCL information # 2.

If QCL information #1 of CC #1 and QCL information #1 of CC #2 indicate the same QCL information, and QCL information #2 of CC #1 and QCL information #2 of CC #2 indicate the same QCL information, CC1#1 and CC #2 are grouped.

For another example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all the CORESET and corresponding QCL information included in the three CCs are configured as follows.

As shown in fig. 13, CC #1 has CORESET #1 and CORESET2, QCL information of CORESET #1 is QCL information #1, and QCL information of CORESET #2 is QCL information # 2. CC #2 has CORESET #3 and CORESET4, QCL information of CORESET #3 is QCL information #1, and QCL information of CORESET #4 is QCL information # 2. CC #3 includes CORESET #5, CORESET6, and CORESET7, QCL information of CORESET #5 is QCL information #1, QCL information of CORESET #6 is QCL information #2, and QCL information of CORESET #7 is QCL information # 3.

If the QCL information #1 of the CC #1, the QCL information #1 of the CC #2 and the QCL information #1 of the CC #3 indicate the same QCL information, the QCL information is different from other QCL information; QCL information #2 of CC #1, QCL information #2 of CC #2, and QCL information #2 of CC #3 indicate the same QCL information, and are different from other QCL information; QCL information #3 of CC #3 is different from other QCL information. Since QCL information of CC1#1 and CC #2 are identical, and QCL information #3 of CC #3 is different from other CCs, CC #1 and CC #2 are divided into one group and CC #3 is another group.

In a second manner, the terminal device may determine cells in which at least one same QCL information exists as the first cell group. Or, all cells in the first cell group have at least one same QCL information. The at least one same QCL information is QCL information of at least one control resource set of a corresponding cell.

It should be understood that the presence of at least one identical QCL information for all cells in the first cell group means that at least one identical QCL information is present between cells in the first cell group. At least one QCL information of the set of control resources of each cell in the first cell group is identical. One cell may configure at least one control resource set, and one control resource set may include at least one QCL information. The QCL information corresponding to one core set of one cell is the same as the QCL information corresponding to one core set of another cell.

For example, the network device is configured to the terminal devices CC #1 and CC #2, and all CORESET and corresponding QCL information included in the two CCs are configured as shown in fig. 14. If the QCL information #1 of CC #1 and the QCL information #1 of CC #2 indicate the same QCL information, and the QCL information #2 of CC #1 and the QCL information #3 of CC #2 indicate different QCL information. Since QCL information #1 of CC #1 and QCL information #1 of CC #2 indicate the same QCL information, CC #1 and CC #2 may be grouped into one group.

For another example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all CORESET and QCL information corresponding to the CORESET included in the three CCs are configured as shown in fig. 15. If the QCL information #1 of the CC #1, the QCL information #1 of the CC #2 and the QCL information #1 of the CC #3 indicate the same QCL information, the QCL information is different from other QCL information; QCL information #2 of CC #1, QCL information #2 of CC #2, and QCL information #2 of CC #3 indicate the same QCL information, and are different from other QCL information; QCL information #3 of CC #3 is different from other QCL information. Since QCL information #1 of CC #1, QCL information #1 of CC #2, and QCL information #1 of CC #3 indicate the same QCL information, and QCL information #2 of CC #1, QCL information #2 of CC #2, and QCL information #2 of CC #3 indicate the same QCL information, CC #1, CC #2, and CC #3 are grouped into one group.

For example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all CORESET and corresponding QCL information included in the three CCs are configured as shown in fig. 16. CC #1 has CORESET #1, and QCL information of CORESET #1 is QCL information # 1. CC #2 has CORESET #2, and QCL information of CORESET #2 is QCL information #1 and QCL information # 3. CC #3 has CORESET #3, and QCL information of CORESET #3 is QCL information #2 and QCL information # 3.

If the QCL information #1 of the CC #1 and the QCL information #1 of the CC #2 indicate the same QCL information, different from other QCL information; QCL information indicated by QCL information #3 of CC #2 is the same, and is different from other QCL information; QCL information #2 and QCL information #3 of CC #3 are both different from other QCL information. Since QCL information #1 of CC1#1 and CC #2 are identical, CC #1 and CC #2 are grouped into one group. Since CC #3 does not include QCL information #1, CC #3 cannot be grouped with CC #1 and CC # 2.

In a third way, the terminal device may determine cells of the control resource set having at least one same TCI status as the first cell group. Or, each cell in the first cell group includes at least one control resource set, where all QCL information in the at least one control resource set included in all cells is the same. In other words, there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and QCL information of all control resource sets included in any control resource set group is the same.

It should be understood that the QCL information of at least one set of control resources of each cell in the first cell group is the same. One cell may configure at least one control resource set, and one control resource set may include at least one QCL information. If the QCL information of the control resource set of one cell is the same as that of the other cell, the two cells are grouped into one cell group.

For example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all CORESET and corresponding QCL information included in the three CCs are configured as shown in fig. 17. CC #1 has CORESET #1, and QCL information of CORESET #1 is QCL information #1 and QCL information # 2. CC #2 has CORESET #2 and CORESET3, QCL information of CORESET #2 is QCL information #1 and QCL information #2, and QCL information of CORESET #3 is QCL information # 3. CC #3 has CORESET #4, CORESET5, and CORESET6, QCL information of CORESET #4 being QCL information #1 and QCL information #2, QCL information of CORESET #5 being QCL information #2, and QCL information of CORESET #6 being QCL information # 3.

If the QCL information #1 of the CC #1, the QCL information #1 of the CC #2 and the QCL information #1 of the CC #3 indicate the same QCL information, the QCL information is different from other QCL information; QCL information #2 of CC #1, QCL information #2 of CC #2, and QCL information #2 of CC #3 indicate the same QCL information, and are different from other QCL information; QCL information #3 of CC #2 is different from other QCL information, and QCL information #3 of CC #3 is different from other QCL information. Since QCL information of core set #1, core set #2 and core set #4 respectively corresponding to CC1#1, CC #2 and CC #3 are identical, CC #1, CC #2 and CC #3 are grouped into one group.

For example, the network device is configured to the terminal devices CC #1, CC #2, and CC #3, and all CORESET and corresponding QCL information included in the three CCs are configured as shown in fig. 18.

CC #1 has CORESET #1, and QCL information of CORESET #1 is QCL information #1 and QCL information # 1. CC #2 has CORESET #2 and CORESET3, QCL information of CORESET #2 is QCL information #1 and QCL information #2, and QCL information of CORESET #3 is QCL information # 3. CC #3 includes CORESET #4, CORESET5, and CORESET6, QCL information of CORESET #4 is QCL information #1, QCL information of CORESET #5 is QCL information #2, and QCL information of CORESET #6 is QCL information # 3.

If the QCL information #1 of the CC #1, the QCL information #1 of the CC #2 and the QCL information #1 of the CC #3 indicate the same QCL information, the QCL information is different from other QCL information; QCL information #2 of CC #1, QCL information #2 of CC #2, and QCL information #2 of CC #3 indicate the same QCL information, and are different from other QCL information; QCL information #3 of CC #2 is different from other QCL information, and QCL information #3 of CC #3 is different from other QCL information. Since QCL information of CORESET #1 and CORESET #2 respectively corresponding to CC1#1 and CC #2 are identical, CC #1 and CC #2 are grouped into one group. Since QCL information corresponding to CORESET #4, CORESET #5, and CORESET #6 of CC #3 is different from QCL information corresponding to CORESET of CC1#1 and CC #2, respectively, CC #3 cannot be grouped with CC #1 and CC # 2.

In another possible implementation manner, the spatial correlation parameter information may be a TCI status, and the terminal device may determine the first cell group according to the TCI status.

If the TCI state of the control resource set of one cell is the same as the TCI state of the control resource set of another cell, the two cells are grouped into one cell group. Or the transmission configuration indication status of the control resource set of each cell within a cell group is the same.

It should be understood that, in this embodiment, the TCI state of the control resource set of one cell means that the terminal device detects a PDCCH (or referred to as DCI) on the control resource set of the one cell according to the TCI state. Or, the one cell is referred to as a target cell, the PDCCH on the control resource set is referred to as a target signal, the TCI state indicates a source reference signal resource, and the terminal device receives or demodulates the target signal on the target cell by using the same or similar spatial parameters as the source reference signal resource.

It should be understood that, in this embodiment, the TCI state being the same may mean that the QCL information indicated by the TCI state is the same. The QCL information may include a reference signal resource index and a QCL type. The QCL information may also include one or more of a cell index and BWP identification. Wherein the cell index indicates a cell where a reference signal resource corresponding to the reference signal resource index is located, and the BWP identifier indicates a location of the BWP of the cell. When the cell index and the BWP identity are not included in the QCL information, the reference signal resources indicated by the default QCL information are on the target cell.

In one possible implementation, at least two of the N cells are associated with the same TCI state.

In another possible design, any two of the N cells are associated with the same TCI state.

In another possible design, each of the N cells is associated with the same TCI state.

In another possible implementation, the TCI state sets of any two cells in the first cell group are the same. Any one set of TCI states is a set of TCI states of all control resource sets of the corresponding cell.

In another possible design, there is at least one identical TCI state for all cells in the first cell group. The at least one same TCI state is a TCI state of the at least one control resource set of the corresponding cell.

In another possible design, each cell in the first cell group includes at least one control resource set, where all TCI states in the at least one control resource set included in all cells are the same. In other words, there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and the TCI status of all control resource sets included in any control resource set group is the same.

It should be understood that the TCI state may be replaced by QCL information, and the detailed explanation may be given in the above description of the QCL information, which is not repeated.

It should be understood that the control resource set in the embodiments of the present application may be replaced with a BFD RS, and the detailed explanation may refer to the above description of the QCL information, which is not repeated herein.

S802, the terminal equipment carries out beam failure detection on the first cell group according to the first parameter of the first cell group.

It should be appreciated that the first parameter of the first cell group is a beam failure detection parameter of the first cell group. In some embodiments, since the network device configures the beam failure detection parameter for each cell, the terminal device may determine the first parameter of the first cell group according to the beam failure detection parameter of the cells in the first cell group.

The beam failure detection parameters include at least one of a beam failure detection reference signal resource, a maximum number of beam failure case, a beam failure detection timer, and a beam failure case indication period. The first parameter may refer to at least one of a beam failure detection reference signal resource, a maximum number of beam failure case, a beam failure detection timer, and a beam failure case indication period.

It should be understood that "detecting a beam failure of the first cell group according to the first parameter" may also be described as "detecting a beam failure of the first cell group according to the first parameter".

Next, a possible implementation of determining the first parameter of the first cell group is explained in detail. Specifically, there may be the following rules:

rule one is as follows: the terminal device may determine the first parameter based on a subcarrier spacing.

In some embodiments, the terminal device may determine the first parameter from a maximum value of a subcarrier spacing. It should be understood that the terminal device determines the beam failure detection parameter of the cell with the largest subcarrier spacing in the first cell group as the first parameter. The first parameter is a beam failure detection parameter of a cell with the largest subcarrier spacing in the first cell group.

In some embodiments, the first parameter comprises at least one of a beam failure detection reference signal resource, a beam failure case maximum number, a beam failure detection timer, and a beam failure case indication period.

Determining the beam failure detection parameter of the cell with the largest subcarrier spacing in the first cell group as the first parameter may be understood to include one or more of the following:

for example, the beam failure detection reference signal resource of the cell having the largest subcarrier spacing is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure instances of the cell with the largest subcarrier spacing is determined as the maximum number of beam failure instances of the first cell group.

For another example, the beam failure detection timer of the cell having the largest subcarrier spacing is determined as the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell having the largest subcarrier spacing is determined as the beam failure case indication period of the first cell group.

Rule two: the terminal device may determine the first parameter according to a cell identity.

In some embodiments, the terminal device may determine the first parameter according to a minimum value of the cell identifier. It should be understood that the terminal device determines the beam failure detection parameter of the cell with the smallest cell identity among all the cells in the first cell group as the first parameter. The first parameter is a beam failure detection parameter of a cell with the smallest cell identification in the first cell group.

The beam failure detection parameter of the cell with the smallest cell identifier in all cells in the first cell group is taken as the first parameter, and may be understood to include one or more of the following:

for example, the beam failure detection reference signal resource of the cell having the smallest cell identification is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure instances of the cell with the smallest cell identifier is determined as the maximum number of beam failure instances of the first cell group.

For another example, the beam failure detection timer of the cell with the smallest cell identification is determined as the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell with the smallest cell identification is determined as the beam failure case indication period of the first cell group.

Rule three: the terminal device may determine the first parameter according to a maximum number of beam failure instances.

In some embodiments, the terminal device may determine the first parameter according to a minimum value of a maximum number of beam failure instances. It should be understood that the terminal device determines, as the first parameter, the beam failure detection parameter of the cell whose beam failure instance is the smallest in the maximum number of times among all cells in the first cell group. The first parameter may be a beam failure detection parameter for a cell with a minimum maximum number of beam failure instances. It should be appreciated that the maximum number of beam failure instances for the first cell group takes on a value that is the minimum of the maximum number of beam failure instances for all cells in the first cell group.

In some embodiments, the first parameter may further include at least one of a beam failure detection reference signal resource, a beam failure detection timer, and a beam failure case indication period.

The beam failure detection parameter of the cell with the smallest maximum number of beam failure cases in all cells in the first cell group is taken as the first parameter, and can be understood to include one or more of the following:

for example, the beam failure detection reference signal resource of the cell having the smallest number of beam failure instances is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the beam failure detection timer of the cell with the smallest number of beam failure instances is determined as the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell whose beam failure case maximum number of times is smallest is determined as the beam failure case indication period of the first cell group.

Rule four: the terminal device may determine the first parameter based on a beam failure detection timer.

In some embodiments, the terminal device may determine the first parameter based on a minimum value of a beam failure detection timer. It should be understood that the terminal device determines, as the first parameter, the beam failure detection parameter of the cell whose beam failure detection timer is the smallest among all the cells in the first cell group. The first parameter is a beam failure detection parameter of the cell with the minimum value of the beam failure detection timer. It should be understood that the value of the beam failure detection timer of the first cell group is the minimum value of the beam failure detection timers in all cells of the first cell group.

In some embodiments, the first parameters may further include at least one of a beam failure detection reference signal resource, a beam failure case maximum number, and a beam failure case indication period.

The terminal device may use the beam failure detection parameter of the cell with the smallest beam failure detection timer in all cells in the first cell group as the first parameter, and may be understood as including one or more of the following:

for example, the beam failure detection reference signal resource of the cell for which the beam failure detection timer is the smallest is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure cases of the cell with the smallest beam failure detection timer is determined as the maximum number of beam failure cases of the first cell group.

For another example, the beam failure case indication period of the cell for which the beam failure detection timer is the smallest is determined as the beam failure case indication period of the first cell group.

Rule five: the terminal device may determine the first parameter according to an indication manner of the beam failure detection reference signal resource.

In some embodiments, the terminal device may determine the first parameter from an implicitly indicated beam failure detection reference signal resource. It is to be understood that the terminal device determines as the first parameter the beam failure detection parameter of the cell of the implicitly indicated beam failure detection reference signal resource in all cells of the first cell group. The first parameter is a beam failure detection parameter of a cell of the implicitly indicated beam failure detection reference signal resource. It should be understood that the beam failure detection reference signal resources of the first cell group are beam failure detection reference signal resources implicitly indicated in all cells of the first cell group.

The implicit indication may be a reference signal resource indicating that a reference signal resource associated in a TCI (e.g., type-D QCL) of the PDCCH is a reference signal resource that satisfies a QCL relationship with a DMRS of the PDCCH and is a periodic reference signal resource, and may be used for beam failure detection.

In some embodiments, the first parameter comprises at least one of a maximum number of beam failure instances, a beam failure detection timer, and a beam failure instance indication period.

The beam failure detection parameters of the cells of the implicitly indicated beam failure detection reference signal resource in all cells of the first cell group are taken as the first parameters, and may be understood to include one or more of the following:

for example, the maximum number of beam failure cases of the cell in which the implicitly indicated beam failure detection reference signal resource is located is determined as the maximum number of beam failure cases of the first cell group.

For another example, the beam failure detection timer of the cell in which the implicitly indicated beam failure detection reference signal resource is located is determined as the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell in which the implicitly indicated beam failure detection reference signal resource is located is determined as the beam failure case indication period of the first cell group.

Rule six: the terminal device may determine the first parameter according to a period of the beam failure detection reference signal resource.

In some embodiments, the terminal device may determine the first parameter according to a minimum value of a period of the beam failure detection reference signal resource. It is to be understood that the terminal device may determine, as the first parameter, a beam failure detection parameter of a cell in the first cell group in which the period of the beam failure detection reference signal resource is smallest. The first parameter is a beam failure detection parameter of a cell with the minimum period of a beam failure detection reference signal resource in the first cell group.

For example, all cells in the first cell group comprise at least one identical transmission configuration indication state. Selecting the beam failure detection reference signal resource with the minimum period from the at least one beam failure detection reference signal resource with the same transmission configuration indication state, and determining the beam failure detection parameter of the cell configuring the beam failure detection reference signal resource with the minimum period as the first parameter.

As another example, all cells in the first cell group include at least one same quasi co-location information of type D. Selecting the beam failure detection reference signal resource with the minimum period from the beam failure detection reference signal resources of the at least one piece of quasi-co-location information with the same type D, and determining the beam failure detection parameter of the cell configuring the beam failure detection reference signal resource with the minimum period as the first parameter.

It should be understood that each cell may have one or more CORESET, one TCI state for each CORESET, each TCI state indicating one tyep D QCL information to the COREST. The BFD RS can satisfy a one-to-one correspondence with the CORESET, and at the moment, the BFD RS satisfies a one-to-one correspondence with the TCI state or the type D QCL. Or the BFD RS and the TCI state meet the one-to-one correspondence. Or the BFD RS and the typeD QCL satisfy a one-to-one correspondence. The BFD RS is received using a TCI state or typeD QCL having a correspondence with the BFD RS.

Optionally, the beam failure case indicates a period maximum { minimum BFD RS period of the same TCI, 2ms }. Optionally, the beam failure case may be reported when the BFD RS of the same TCI in the beam failure case indication period is smaller than the beam failure threshold.

Optionally, the beam failure case indicates a period of maximum { minimum BFD RS period of same QCL information, 2ms }. Optionally, the beam failure case may be reported when the BFD RS indicating the same QCL information in the period is smaller than the beam failure threshold.

It is to be understood that the beam failure detection reference signal resources of the first cell group may configure beam failure detection reference signal resources indicating status or corresponding to the same QCL information for the same transmission in all cells of the first cell group.

It should be appreciated that the beam failure instance indication period of the first cell group may be a minimum of periods of beam failure detection reference signal resources corresponding to the same transmission configuration indication state or corresponding to the same QCL information in all cells of the first cell group. Alternatively, the beam failure case indication period of the first cell group may be a minimum value of a period of beam failure detection reference signal resources corresponding to the same transmission configuration indication state or corresponding to the same QCL information among all cells of the first cell group and a maximum value of 2 ms.

In some embodiments, the first parameters may further include at least one of a maximum number of beam failure instances, a beam failure detection timer, and a beam failure instance indication period.

Determining the beam failure detection parameter of the cell with the smallest period of the beam failure detection reference signal resource in the first cell group as the first parameter may be understood to include one or more of the following:

for example, the maximum number of beam failure instances of the cell having the smallest period of the beam failure detection reference signal resource is determined as the maximum number of beam failure instances of the first cell group.

For another example, the beam failure detection timer of the cell having the smallest period of the beam failure detection reference signal resource is determined as the beam failure detection timer of the first cell group.

For example, type D QCL of CORESET of CC #1 indicates reference signal RS #1, and BFD RS is RS #2 (period is 5 ms). Type D QCL of CORESET of CC #2 indicates reference signal RS #1, BFD RS is RS #3 (with a period of 10 ms). The BFD RSs corresponding to the same QCL information are RS #2 and RS # 3. The minimum period of RS #2 and RS #3 is 5ms, so the beam failure case indication period is maximum {5ms,2ms }, 5 ms.

Rule seven: the terminal device may determine the first reference according to a beam failure case indication period.

In some embodiments, the terminal device may determine the first parameter according to a minimum value of a beam failure case indication period. It should be understood that the terminal device determines the beam failure detection parameter of the cell with the minimum beam failure case indication period in the first cell group as the first parameter. The first parameter is a beam failure detection parameter of a cell with a minimum beam failure case indication period. The beam failure case indication period of the first cell group is the smallest beam failure case indication period among all cells in the first cell group.

It should be noted that, the beam failure case indication period of the first cell group may be determined according to the beam failure detection reference signal resource with the same transmission configuration indication state in all cells in the first cell group. Alternatively, the beam failure case indication period of the first cell group may be determined according to beam failure detection reference signal resources in which quasi co-location information is the same in all cells in the first cell group. Wherein the beam failure case indication period may be determined according to a minimum value of a period of the beam failure detection reference signal resource. For example, the beam failure case indication period may be a maximum of { periodic minimum of beam failure detection reference signal resources, 2ms }.

It should be appreciated that the value of the beam failure case indication period of the first cell group may be the minimum value of the beam failure case indication periods in all cells of the first cell group. Or the value of the beam failure case indication period of the first cell group may be { the minimum value of the beam failure case indication periods in all cells of the first cell group, 2ms }.

In some embodiments, the first parameters may further include at least one of a beam failure detection reference signal resource, a beam failure instance maximum number, and a beam failure detection timer.

Determining the beam failure detection parameter of the cell with the smallest beam failure case indication period in the first cell group as the first parameter may be understood to include one or more of the following:

for example, the beam failure detection reference signal resource of the cell whose beam failure instance indication period is the smallest is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure instances of the cell with the minimum beam failure instance indication period is determined as the maximum number of beam failure instances of the first cell group.

For another example, the beam failure detection timer of the cell with the smallest beam failure case indication period is determined as the beam failure detection timer of the first cell group.

Rule eight: the terminal device may determine the first parameter according to a transmission configuration indication status of the set of control resources.

In some embodiments, the terminal device may determine the first parameter according to a minimum set of transmission configuration indication states of a set of control resources. It is to be understood that the terminal device determines as said first parameter the beam failure detection parameter of the cell of the smallest set of transmission configuration indication states of the set of control resources in the first cell group. The first parameter is a beam failure detection parameter of a cell in a control resource set transmission configuration indication state in the first cell group. Or, one TCI state set of one cell is a set of TCI states of all control resource sets of the corresponding cell, and the beam failure detection parameter of the cell having the smallest TCI state set in the first cell group is determined as the first parameter.

Determining as the first parameter a beam failure detection parameter for a cell of the first group of cells having a smallest set of TCI states may be understood to include one or more of:

for example, the beam failure detection reference signal resource of the cell having the smallest set of TCI states in the first cell group is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure instances for the cell in the first cell group having the smallest set of TCI states is determined to be the maximum number of beam failure instances for the first cell group.

For another example, the beam failure detection timer of the cell having the smallest set of TCI states in the first cell group is determined to be the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell having the smallest set of TCI states in the first cell group is determined as the beam failure case indication period of the first cell group.

And a ninth rule: the terminal device may determine the first parameter according to quasi co-location information of the control resource set.

In some embodiments, the terminal device may determine the first parameter from a minimum set of quasi co-location information of a set of control resources. It is to be understood that the terminal device determines as said first parameter the beam failure detection parameter of the cell of the smallest set of quasi co-located information of the set of control resources in the first cell group. The first parameter is a beam failure detection parameter for a cell of a minimum set of quasi co-located information of a set of control resources in the first cell group.

In some embodiments, the first parameter comprises at least one of a beam failure detection reference signal resource, a beam failure case maximum number, a beam failure detection timer, and a beam failure case indication period. Or, one quasi co-location information set of one cell is a set of quasi co-location information of all control resource sets of the corresponding cell, and the beam failure detection parameter of the cell with the smallest quasi co-location information set in the first cell group is determined as the first parameter.

Determining, as the first parameter, a beam failure detection parameter of a cell of the first cell group that controls a minimum value of quasi co-location information of a set of resources may be understood to include one or more of:

for example, the beam failure detection reference signal resource of the cell having the smallest set of quasi-co-located information in the first cell group is determined as the beam failure detection reference signal resource of the first cell group.

For another example, the maximum number of beam failure instances of the cell having the smallest set of quasi co-located information in the first cell group is determined as the maximum number of beam failure instances of the first cell group.

For another example, the beam failure detection timer of the cell having the smallest set of quasi-co-located information in the first cell group is determined as the beam failure detection timer of the first cell group.

For another example, the beam failure case indication period of the cell having the smallest set of quasi-co-located information in the first cell group is determined as the beam failure case indication period of the first cell group.

Illustratively, the quasi co-location information of type D of the control resource set of CC #1 indicates reference signals RS #1 and RS #2, the BFD RS corresponding to RS #1 is BFD RS #3, and the BFD RS corresponding to RS #2 is BFD RS # 4. The quasi co-location information of type D of the control resource set of CC #2 indicates reference signal RS #1, and BFD RS corresponding to RS #1 is RS # 5. Since the QCL information set of CC #2 includes only one smaller QCL information set than CC #1, the first parameter is the beam failure detection parameter of CC 2.

It should be noted that the terminal device may determine all the beam failure detection parameters of the first cell group according to the above rule, or determine some beam failure detection parameters of the first cell group. Such as: a beam failure detection reference signal resource, a maximum number of beam failure instances, a beam failure detection timer, and at least one of a beam failure instance indication period. The above rules for determining the first parameter may be used in combination or individually, and the application is not limited thereto.

In some embodiments, rule one and rule two may be used in combination. For example, if the terminal device selects a cell with the largest interval between two or more subcarriers, at this time, the terminal device may select a cell with the smallest cell identifier from the cells with the largest interval between two or more subcarriers, and use a beam failure detection parameter of the cell with the smallest cell identifier as a first parameter of the first cell, where the beam failure detection parameter may include all or part of a beam failure detection reference signal resource, the maximum number of beam failure cases, a beam failure detection timer, and a beam failure case indication period. And determining the beam failure detection reference signal resource of the cell with the minimum cell identification as the beam failure detection reference signal resource of the first cell group. And determining the maximum times of the beam failure cases of the cell with the minimum cell identification as the maximum times of the beam failure cases of the first cell group. The beam failure detection timer of the cell having the smallest cell identification is determined as the beam failure detection timer of the first cell group. And determining the beam failure case indication period of the cell with the minimum cell identification as the beam failure case indication period of the first cell group.

Optionally, if the terminal device selects a cell with a largest subcarrier spacing, the beam failure detection parameter of the cell with the largest subcarrier spacing is used as the first parameter of the first cell. The beam failure detection parameters of other cells are invalid.

In other possible embodiments, rule one and rule three may be used in combination. For example, if the terminal device selects a cell with the largest interval between two or more subcarriers, in this case, the terminal device may select, as the first parameter, the beam failure detection parameter of the cell with the largest number of times of beam failure cases from the cell with the largest interval between two or more subcarriers.

In other possible embodiments, rule one and rule four may be used in combination. For example, if the terminal device selects a cell with the largest interval between two or more subcarriers, in this case, the terminal device may select the beam failure detection parameter of the cell with the smallest beam failure detection timer as the first parameter from the cell with the largest interval between two or more subcarriers.

In other embodiments, any two or any three of rules one through nine may be used in combination or any number may be used in combination. When a plurality of rules are used in combination, it is necessary to define which rule is preferentially used (i.e., which rule is preferentially used for selecting resources).

Optionally, the priority of rule one is greater than the priority of at least one of the following rules: rule two through rule nine. Such as: rule one through rule nine are present, then rule one has the highest priority.

Optionally, the priority of rule two is greater than the priorities of rule three to rule nine; or the priority of rule two is greater than the priority of any of rules three through nine.

Alternatively, the priority of rules four to nine may set the priority level of the rules with reference to the above-described method.

The terminal device may select the resource according to the rule with the higher priority, and when there are multiple resources in the resource, the terminal device may select the resource from the multiple resources according to the rule with the second highest priority, and so on.

In other possible embodiments, at least two of rules one through nine may be used in combination. For example, the terminal device determines the maximum number of beam failure cases of the first cell group according to rule three, that is, the maximum number of beam failure cases of the first cell group takes the minimum value of the maximum number of beam failure cases of all cells in the first cell group, and determines the beam failure detection timer of the first cell group according to rule four, the value of the beam failure detection timer of the first cell group takes the minimum value of the beam failure detection timers in all cells of the first cell group, and determines the beam failure detection reference signal resource of the first cell group according to rule five, the beam failure detection reference signal resource of the first cell group takes the beam failure detection reference signal resource implicitly indicated in all cells of the first cell group, and determines the beam failure case indication period of the first cell group according to rule seven, the beam failure case indication period of the first cell group takes the beam failure detection reference signal resource implicitly indicated in all cells in the first cell group The bundle failure case indicates a period and a maximum of 2 ms.

In some embodiments, the terminal device and the network device may predefine or pre-configure rules one through nine, and the terminal device or the network device selects at least one rule from the rules one through nine to determine the first parameter.

In other embodiments, the terminal device and the network device may predefine or pre-configure at least one of rules one through nine, and the terminal device or the network device determines the first parameter according to the stored rules.

The specific manner of determining the first reference is not specified in the present application, but of course, other manners of determining the first parameter are possible.

S803 may be executed after the terminal device determines the first parameter of the first cell group and performs beam failure detection on the first cell group according to the first parameter of the first cell group.

For a specific beam failure detection process, reference is made to the description of S101, which is not repeated herein.

S803, the terminal equipment determines that the first cell group beam fails.

When the terminal device performs the beam failure detection on the first cell group according to the first parameter of the first cell group, N cells in the first cell group may share one beam failure detection timer and one beam failure detection counter. For a specific beam failure detection method, reference may be made to the description of S101, which is not described in detail.

S804, the terminal equipment sends the beam failure recovery request information to the network equipment.

It should be understood that, in the embodiments of the present application, the beam failure recovery request information may be used to indicate cell information of the beam failure cell. The terminal device may send the beam failure recovery request information to the network device carried on the MAC-CE.

In some embodiments, the beam failure recovery request information comprises at least one of: identification information of one cell within the first cell group and at least one reference signal resource information used for recovering a link of at least one cell in the first cell group.

The reference signal resource information may be a reference signal resource index for a recovery beam failed cell or information that does not identify a reference signal resource for a recovery beam failed cell. The at least one reference signal resource information may also be referred to as reference signal resource information of a cell failing to recover the beam.

It should be understood that, in the embodiments of the present application, the reference signal resource information of the cell with the failed beam recovery may be a reference signal resource index of the cell with the failed beam recovery, may also be a reference signal resource index of the cell with the failed beam recovery and channel quality information of the reference signal resource, and may also be indication information that the reference signal resource of the cell with the failed beam recovery is not identified. The reference signal resource of the cell with failed beam recovery may be a CSI-RS resource or an SSB resource. The channel quality information of the reference signal resources may be one or more of RSRP, SINR, RSRQ, CQI.

Optionally, for any one of the N cells, the terminal device identifies the reference signal resource of the cell for recovering the beam failure, that is, may report the beam failure reference signal resource index corresponding to the cell. E.g., N cells correspond to N reference signal resource information. And the terminal equipment reports the identification information of one cell and the reference signal resource information of N cells.

In some embodiments, the identification information of the cell is an identification of the cell or an index of the cell. The cell is the cell in which the beam failure occurs.

In some embodiments, the identification information of the cell may be indication information of a beam failure cell identification. Such as indicating whether a cell has a beam failure via a bitmap. For example, there are K cells requiring beam failure detection or beam failure recovery, then K bits may be used to represent the K cells, and different values of each bit indicate two states of beam failure and no beam failure of the corresponding cell. For example: the ith bit corresponds to the ith cell, and when the ith bit is 1, the ith cell is indicated to have beam failure; when the ith bit is 0, it indicates that no beam failure occurs in the ith cell.

Alternatively, the identification information of one cell may be a cell to which the first parameter belongs. Alternatively, the identification information of one cell may be identification information identifying a smallest cell in the first cell group.

In some embodiments, "identification information of a cell" may be replaced with "identification information of a cell group".

In some embodiments, the terminal device may select the first resource from the second resources to transmit the link failure recovery request information according to the method described above.

It should be understood that the resources carrying the BFRQ may be made in several possible ways:

mode 1: the terminal device may select S104 to configure or instruct a PUSCH resource in the PUSCH to transmit N repeated BFRQs (which may also be referred to as N identical BFRQ MAC-CEs). Optionally, the N repeated BFRQ information is independently encoded.

Mode 2: the terminal device may select S104 that the network device configures or instructs multiple PUSCH resources in the PUSCH to transmit N repeated BFRQs (which may also be referred to as N identical BFRQ MAC-CEs). For example, the terminal device selects 2 PUSCH resources to carry 2 MAC-CEs, respectively.

As for the mode 1 and the mode 2, it is an optional step that the terminal device selects the PUSCH resource to transmit the beam failure recovery request information according to the preset rule. That is, the terminal device may not perform the selection of the PUSCH resource by the terminal device according to the preset rule to transmit the beam failure recovery request information. The PUSCH resources selected by the terminal device at this time may depend on the implementation of the terminal device.

For convenience of description, the terminal device selects the PUSCH resource to send the beam failure recovery request information, which is referred to as the first resource for short, according to the preset rule.

S805, the network equipment determines a first cell group.

In some embodiments, the network device may determine the first cell group from the spatial correlation parameter information. In other embodiments, the network device first groups a plurality of cells, and then associates one cell group with the same spatial correlation parameter information.

In some embodiments, the terminal device may determine at least two cells identical to the QCL information of the at least one control resource set as the first cell group.

For example, the terminal device determines at least two cells having the same QCL information as the first cell group. It should be understood that at least two of the N cells are associated with the same QCL information.

For another example, the terminal device determines any two cells associated with the same QCL information as the first cell group. It should be understood that any two of the N cells are associated with the same QCL information.

In other embodiments, the terminal device may determine each cell associated with the same spatial correlation parameter information as the first cell group. It is to be understood that each of the N cells is associated with the same spatially dependent parameter information.

For example, the terminal device may determine cells having the same set of QCL information as the first cell group. It should be understood that the QCL information sets for any two cells in the first cell group are the same. Any one of the QCL information sets is a set of QCL information of all control resource sets of the corresponding cell.

For another example, the terminal device may determine cells in which at least one same QCL information exists as the first cell group. There is at least one same QCL information for all cells in the first cell group. The at least one same QCL information is QCL information of at least one control resource set of a corresponding cell.

For another example, the terminal device may determine cells having at least one same set of control resources as the first cell group. Each cell in the first cell group includes at least one control resource set, wherein all QCL information in the at least one control resource set included in all cells is the same.

The spatial-related parameter information may refer to QCL information or TCI. For a specific grouping method, reference may be made to the description of S801 above, which is not repeated.

And S806, the network equipment receives the beam failure recovery request information.

It should be noted that, the order of the steps of the method provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances, for example, the order between S805 and S806 may be interchanged, that is, S806 may be executed first and S805 is executed second, and any method that is easily considered to be changed by those skilled in the art within the technical scope of the present application shall be covered by the protection scope of the present application, and therefore, the description thereof is omitted.

It should be noted that this embodiment may further include other steps, such as identifying a new link and feeding back a beam failure recovery response to the terminal device by the network device, which may specifically refer to the descriptions of S102, S107, and S108, and is not described again.

It should be noted that, alternatively, the TCI status or the QCL information in the embodiments of the present application may refer to activated TCI status or QCL information indicated by activated TCI status.

According to the beam failure detection method provided by the embodiment of the application, because the cells with the same beam direction are divided into one group, the beam failure detection can be performed on all the cells in the cell group through one beam failure recovery process, so that the realization complexity of performing the beam failure detection on a plurality of cells by the terminal equipment is effectively reduced; in addition, the beam failure recovery request information of a plurality of cells is transmitted through one MAC-CE, so that the resource overhead of transmitting the beam failure recovery request information is effectively saved.

It is to be understood that, in order to implement the functions in the above embodiments, the network device and the terminal device include hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software driven hardware depends on the particular application scenario and design constraints imposed on the solution.

Fig. 19 and 20 are schematic structural diagrams of a possible communication device provided in an embodiment of the present application. These communication devices can be used to implement the functions of the terminal device or the network device in the above method embodiments, so that the beneficial effects of the above method embodiments can also be achieved. In the embodiment of the present application, the communication apparatus may be the terminal device 520 shown in fig. 5, the network device 510 shown in fig. 5, or a module (e.g., a chip) applied to the terminal device or the network device.

As shown in fig. 19, the communication apparatus 1900 includes a processing unit 1910 and a transceiving unit 1920. The communication device 1900 is used to implement the functions of the terminal device or the network device in the method embodiment shown in fig. 8.

When the communication apparatus 1900 is used to implement the functions of the terminal device in the method embodiment shown in fig. 8: the transceiving unit 1920 is configured to execute S804; the processing unit 1910 is configured to execute S801 to S803.

When the communication apparatus 1900 is used to implement the functions of the network device in the method embodiment shown in fig. 8: the transceiving unit 1920 is configured to execute S806; the processing unit 1910 is configured to execute S805.

The more detailed description about the processing unit 1910 and the transceiving unit 1920 can be directly obtained by referring to the related description in the embodiment of the method shown in fig. 8, which is not repeated here.

As shown in fig. 20, the communication device 2000 includes a processor 2010 and an interface circuit 2020. The processor 2010 and the interface circuit 2020 are coupled to one another. It is to be appreciated that the interface circuit 2020 can be a transceiver or an input-output interface. Optionally, the communication device 2000 may further include a memory 2030 for storing instructions executed by the processor 2010 or storing input data required by the processor 2010 for executing the instructions or storing data generated by the processor 2010 after executing the instructions.

When the communications apparatus 2000 is used to implement the method shown in fig. 8, the processor 2010 is configured to perform the functions of the processing unit 1910, and the interface circuit 2020 is configured to perform the functions of the transceiver unit 1920.

When the communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiment. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, wherein the information is sent to the terminal device by the network device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device, where the information is sent by the terminal device to the network device.

When the communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, wherein the information is sent to the network device by the terminal device; alternatively, the network device chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal device.

It is understood that the Processor in the embodiments of the present Application may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read-Only Memory (ROM), Programmable ROM (PROM), Erasable PROM (EPROM), Electrically EPROM (EEPROM), registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a network device or a terminal device. Of course, the processor and the storage medium may reside as discrete components in a network device or a terminal device.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer program or 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 program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In the description of the text of the present application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship; in the formula of the present application, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for beam failure detection, comprising:

determining a first cell group, wherein the first cell group comprises N cells, at least two of the N cells are associated with the same spatial correlation parameter information, and N is an integer greater than or equal to 2;

performing beam failure detection on the first cell group according to a first parameter of the first cell group.
The method of claim 1, wherein the spatial correlation parameter information indicates a TCI status for transmission configuration, and wherein at least two of the N cells are associated with a same spatial correlation parameter, comprising:

the TCI state sets of any two cells in the first cell group are the same, and any one TCI state set is a set of TCI states of all control resource sets of the corresponding cell, or,

at least one same TCI state exists for all cells in the first cell group, the at least one same TCI state being a TCI state of at least one control resource set of a corresponding cell, or,

there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and the TCI status of all control resource sets included in any control resource set group is the same.
The method of claim 1, wherein the spatial correlation parameter information is quasi co-located QCL information, and wherein at least two of the N cells are associated with the same spatial correlation parameter, comprising:

the QCL information sets of any two cells in the first cell group are the same, and any one QCL information set is a set of QCL information of all control resource sets of the corresponding cell, or,

at least one same QCL information for at least one control resource set of a corresponding cell exists for all cells in the first cell group, or,

there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and QCL information of all control resource sets included in any control resource set group is the same.
The method according to any of claims 1-3, wherein the first parameter is a beam failure detection parameter for a cell with a largest subcarrier spacing in the first cell group.
The method of any of claims 1-4, wherein the first parameter is a beam failure detection parameter for a cell with a smallest cell identification in the first cell group.
The method according to any of claims 1-5, wherein the first parameter is a beam failure detection parameter for a cell with a minimum maximum number of beam failure instances.
The method according to any of claims 1-6, wherein the first parameter is a beam failure detection parameter of a cell with a minimum beam failure detection timer.
The method according to any of claims 1-7, wherein the first parameter is a beam failure detection parameter of a cell in which an implicitly indicated beam failure detection reference signal resource is located.
The method according to any of claims 1-8, wherein the first parameter is a beam failure detection parameter of a cell in which a minimum period beam failure detection reference signal resource is located, the transmission configuration indication status corresponding to the minimum period beam failure detection reference signal resource is the same transmission configuration indication status of the N cells, or the quasi co-location information corresponding to the minimum period beam failure detection reference signal resource is the same quasi co-location information of the N cells.
The method according to any of claims 1-9, wherein the first parameter is a beam failure detection parameter indicating a cell with a minimum period of beam failure instances.
The method according to any of claims 1-10, wherein the first parameter is a beam failure detection parameter of a cell with a minimum number of states indicated by a transmission configuration of a set of control resources in the N cells; or, the first parameter is a beam failure detection parameter of a cell with the smallest number of quasi co-location information of the control resource set in the N cells.
The method according to any of claims 1-11, wherein the beam failure detection parameters comprise at least one of beam failure detection reference signal resources, beam failure case maximum number, beam failure detection timer, and beam failure case indication period.
The method of any of claims 1-12, wherein the N cells in the first cell group share one beam failure detection timer and one beam failure detection counter.
The method according to any one of claims 1-13, further comprising:

determining that the first cell group beam failed;

transmitting beam failure recovery request information, the beam failure recovery request information including at least one of:

identification information of a cell within the first cell group and at least one reference signal resource information used to recover a link of at least one cell in the first cell group.
A method for beam failure detection, comprising:

determining a first cell group, wherein at least two cells in the N cells are associated with the same space related parameter information, and N is an integer greater than or equal to 2;

receiving beam failure recovery request information, the beam failure recovery request information including at least one of:

identification information of a cell within the first cell group and at least one reference signal resource information used to recover a link of at least one cell in the first cell group.
The method of claim 15, wherein the spatial correlation parameter information indicates a TCI status for transmission configuration, and wherein at least two of the N cells are associated with the same spatial correlation parameter information, comprising:

the TCI state sets of any two cells in the first cell group are the same, and any one TCI state set is a set of TCI states of all control resource sets of the corresponding cell, or,

at least one same TCI state exists for all cells in the first cell group, the at least one same TCI state being a TCI state of at least one control resource set of a corresponding cell, or,

there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and the TCI status of all control resource sets included in any control resource set group is the same.
The method of claim 15, wherein the spatial correlation parameter information is quasi co-located QCL information, and wherein at least two of the N cells are associated with the same spatial correlation parameter, comprising:

the QCL information sets of any two cells in the first cell group are the same, and any one QCL information set is a set of QCL information of all control resource sets of the corresponding cell, or,

at least one same QCL information for at least one control resource set of a corresponding cell exists for all cells in the first cell group, or,

there is at least one control resource set group in the first cell group, wherein any control resource set group in the at least one control resource set group includes at least one control resource set of each cell in the first cell group, and QCL information of all control resource sets included in any control resource set group is the same.
A communications apparatus, comprising: at least one processor, a memory, wherein the memory is configured to store a computer program such that the computer program, when executed by the at least one processor, implements the beam failure detection method of any of claims 1-14 or implements the beam failure detection method of any of claims 15-17.
A computer-readable storage medium, comprising: computer software instructions;

the computer software instructions, when run in a communication device or a chip built in a communication device, cause the communication device to perform the beam failure detection method of any of claims 1-14 or to implement the beam failure detection method of any of claims 15-17.