CN110798900B

CN110798900B - Method and device for recovering communication failure

Info

Publication number: CN110798900B
Application number: CN201811334417.6A
Authority: CN
Inventors: 张荻; 刘鹍鹏; 管鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-08-03
Filing date: 2018-11-09
Publication date: 2024-03-05
Anticipated expiration: 2038-11-09
Also published as: CN110798900A

Abstract

The application provides a method and a device for recovering communication failure, wherein the method comprises the following steps: when the terminal device determines that communication on the first downlink resource fails, the terminal device transmits indication information for indicating that communication on the first downlink resource fails to the network device on a resource for transmitting channel state information CSI. The communication failure recovery method is beneficial to reducing the resource overhead of the network equipment.

Description

Method and device for recovering communication failure

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for communication failure recovery.

Background

In order to meet the requirements of single user peak rate and system capacity improvement, one of the most straightforward approaches is to increase the system transmission bandwidth, and carrier aggregation (carrier aggregation, CA) is introduced in the enhanced long term evolution (advanced long term evolution, LTE-a) technology, where 2 or more carrier units (component carrier, CC) are aggregated together to support a larger transmission bandwidth, and each CC is composed of 1 or more physical resource blocks (physical resource block, PRB).

In the multi-carrier scenario, each CC corresponds to an independent cell (cell), and a terminal device configured with carrier aggregation is connected to 1 primary cell (Pcell) and multiple secondary cells (Scell). Pcell is an initially accessed cell, scell is configured after access via radio control resources (radio resource control, RRC) to provide more radio resources. If the Scell does not configure uplink resources, the Scell is recovered by physical random access channel (physical random access channel, PRACH) resources of uplink non-contention free (content free) of the Pcell when the Scell fails in link.

If the number of scells is too large, the Pcell needs to allocate PRACH resources of a plurality of scells to recover the link failure of the Scell, and the resource overhead is large.

Disclosure of Invention

The application provides a communication failure recovery method and device, aiming at avoiding excessive resource overhead of network equipment.

In a first aspect, a method for recovering from communication failure is provided, the method comprising: the terminal equipment sends first indication information to the network equipment on a first uplink resource, wherein the first indication information is used for indicating communication failure on the first downlink resource, and the first uplink resource is used for bearing Channel State Information (CSI); wherein the first uplink resource belongs to a first cell, the first downlink resource belongs to a second cell, and the first cell and the second cell are different cells or the same cell; alternatively, the spatial correlation parameter associated with the first downlink resource is different from the spatial correlation parameter associated with the first uplink resource.

In some possible implementations, the spatial related parameter of the downlink resource corresponds to TCI or QCL information (including one or more reference signals), and the spatial related parameter of the uplink resource corresponds to spatial relation information (including one or more reference signals).

In some possible implementations, before the terminal device sends the first indication information to the network device on the first uplink resource, the method further includes: the terminal device determines that communication on the first downlink resource failed.

In some possible implementations, the first cell and the second cell belong to the same cell group, or the first cell and the second cell belong to different cell groups.

Optionally, the CSI includes one or more of a reference signal resource index (e.g., CRI), a Rank Indication (RI), a Layer Indication (LI), a precoding indication (PMI), and a Channel Quality Indication (CQI).

It is to be appreciated that the first indication information may be link failure recovery request (beam failure recovery request, BFRQ) information for requesting recovery of a link failure between the terminal device and another network device.

It should also be understood that, under normal circumstances, the terminal device sends the CSI to the network device on the first uplink resource, and when the terminal device determines that a link failure occurs with the other network device, the terminal device preferentially sends the BFRQ on the first uplink resource, and optionally, the first uplink resource further includes partial CSI information.

In some possible implementations, the network device may be a primary network device of the terminal device, and the other network device may be one of a plurality of secondary network devices of the terminal device.

In some possible implementations, the network device and the other network device are the same network device.

According to the communication failure recovery method, the terminal equipment sends the indication information for indicating the communication failure through the resource carrying the channel state information, and resource expenditure of the network equipment is saved.

With reference to the first aspect, in some possible implementations of the first aspect, the CSI includes a channel quality indication CQI field, and the first indication information is carried in a status bit of the CQI field.

In some possible implementations, the first indication information is carried in a lowest state bit of the CQI field.

With reference to the first aspect, in certain possible implementations of the first aspect, the CQI field includes a wideband CQI field, and the first indication information is carried in a lowest state bit of the wideband CQI field.

In some possible implementations, when the wideband CQI field is the lowest state bit (0000 (binary) or 0 (decimal)), it indicates that the terminal equipment sends the first indication information, or indicates that the content carried on the first uplink resource includes the first indication information.

In some possible implementations, when the wideband CQI field is a non-lowest state bit (non-binary 0000 (e.g., binary 0001-1111) or non-decimal 0), it indicates that the terminal device does not send the first indication information, or indicates that CSI is carried on the first uplink resource.

In some possible implementations, the first indication information is carried in a special status bit of the CQI field.

With reference to the first aspect, in certain possible implementations of the first aspect, the CQI field includes a wideband CQI field and a subband CQI field, and the first indication information is carried in a status bit of the combination of the wideband CQI field and the subband CQI field.

In some possible implementations, the sub-band CQI is a sub-band differential CQI that is used to report differential values of the relative bandwidth CQI for each sub-band.

In some possible implementations, when the status bit of the combination of the wideband CQI field and the subband CQI field is decimal 0 or negative, it indicates that the terminal device sends the first indication information, or indicates that the content carried on the first uplink resource includes the first indication information.

In some possible implementations, the status bit of the wideband CQI field is the lowest status bit (0000 (binary) or 0 (decimal)), and the status bit of the subband CQI field is the lower status bit.

Specifically, the lower state bit of the sub-band CQI word field is 00 (binary) or 0 (decimal), or the lower state bit of the sub-band CQI word field is 01 (binary) or 1 (decimal), or the lower state bit of the sub-band CQI word field is 10 (binary) or 2 (decimal).

In some possible implementations, the state bit of the wideband CQI field is the next lowest state bit and the state bit of the sub-band differential CQI field is the lower state bit.

Specifically, the state bit of the wideband CQI field is 0001 (binary) or 1 (decimal), the lower state bit of the subband CQI field is 01 (binary) or 1 (decimal), or the lower state bit of the subband CQI field is 10 (binary) or 2 (decimal).

According to the communication failure recovery method, the terminal equipment sends the first indication information through multiplexing or punching the state bit of the channel state quality word field used for transmitting the channel state information, and resource expenditure of the network equipment is saved.

With reference to the first aspect, in some possible implementations of the first aspect, the first indication information is carried in padding bits of the CSI.

In some possible implementations, the padding bits are all 1, which indicates that the terminal device sends the first indication information or indicates that the content carried on the first uplink resource includes the first indication information; the padding bits are all 0, which indicates that the terminal device does not send the first indication information or indicates that CSI is carried on the first uplink resource.

In some possible implementations, the padding bits are all 0, which indicates that the terminal device sends the first indication information or indicates that the content carried on the first uplink resource includes the first indication information; the padding bits are all 1, which indicates that the terminal device does not send the first indication information or indicates that CSI is carried on the first uplink resource.

According to the communication failure recovery method, the terminal equipment sends the first indication information by multiplexing the filling bits used for transmitting the channel state information, and resource expenditure of the network equipment is saved.

With reference to the first aspect, in certain possible implementations of the first aspect, the first indication information is carried in a non-zero wideband amplitude coefficient word field of the CSI.

In some possible implementations, when the non-zero wideband amplitude is the lowest state bit (00 (binary)) in the digital domain, it indicates that the terminal device sends the first indication information, or indicates that the content carried on the first uplink resource includes the first indication information; when the non-zero wideband amplitude is a non-lowest state bit (01-11 (binary)) in the digital domain, it indicates that the terminal device does not send the first indication information, or indicates that CSI information is carried on the first uplink resource.

In some possible implementations, when the non-zero wideband amplitude is the highest state bit (11 (binary)) in the digital domain, it indicates that the terminal device sends the first indication information, or indicates that the content carried on the first uplink resource includes the first indication information; when the non-zero wideband amplitude is a non-highest state bit (00-10 (binary)) in the digital domain, it indicates that the terminal device does not send the first indication information, or indicates that CSI information is carried on the first uplink resource.

According to the communication failure recovery method, the terminal equipment sends the first indication information through multiplexing or punching the non-zero broadband amplitude system digital domain used for transmitting the channel state information, and resource expenditure of the network equipment is saved.

With reference to the first aspect, in certain possible implementation manners of the first aspect, the method further includes: the terminal equipment sends second indication information to the network equipment on the first uplink resource, wherein the second indication information comprises one or more of identification information of the second cell, information of a first reference signal with channel quality being greater than or equal to a first preset threshold, or information of a second reference signal with channel quality being less than or equal to a second preset threshold.

In some possible implementations, the first reference signal is a reference signal newly identified on a downlink (a link between the terminal device and the network device), and the information of the first reference signal includes a resource index of the first reference signal and/or quality information of the first reference signal. In some possible implementations, the second reference signal is a reference signal that fails in the downlink (a link between the terminal device and the network device), and the information of the second reference signal includes a resource index of the second reference signal and/or quality information of the second reference signal.

Specifically, the downlink is a link between the terminal device and the network device in the second cell; alternatively, the downlink is a link between the terminal device and another network device in the second cell.

It should be understood that in this application, the downlink may also be understood as a link between the terminal device and the network device (or another network device), the first reference signal or the second reference signal being a reference signal of the second cell.

In some possible implementations, the second indication information is carried in a field corresponding to the lowest priority content of the CSI.

In some possible implementations, the lowest priority content is the content with the highest priority or the lowest transmission priority when the number of bits of the CSI reported by the terminal device exceeds the maximum resource allocation.

In some possible implementations, the lowest priority content is part 2 of the CSI feedback, or the lowest priority content is part 2 of the last subband or the last subband of the CSI feedback.

In some possible implementations, the lowest priority content of the CSI is the content of part 2 or the content of part 2 of the last subband.

In some possible implementations, the method includes: the terminal equipment sorts the word fields corresponding to the priority contents in the CSI according to a predefined rule, and determines the word field corresponding to the first priority content; the terminal equipment loads the second indication information in a word field corresponding to the first priority content.

In some possible implementations, the method includes: the terminal equipment determines the word domain corresponding to the first priority content from the word domain corresponding to the first priority content and the word domain corresponding to the second priority content in the CSI according to a predefined rule; the terminal equipment loads the second indication information in a word field corresponding to the first priority content.

In some possible implementations, at least part of the identification information of the second cell, the information of the first reference signal, and the information of the second reference signal is carried by the first indication information.

In some possible implementations, the second cell includes one or more cells.

It should be understood that at least part of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal is carried on the first indication information, and that the terminal device may simultaneously transmit at least part of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal and the first indication information to the network device.

In some possible implementations, the second indication information and the first indication information are carried in different status bits of the CSI.

It should be understood that the terminal device may also send the first indication information and the second indication information to the network device at different times.

With reference to the first aspect, in some possible implementations of the first aspect, the first downlink resource is a physical downlink control channel PDCCH resource.

With reference to the first aspect, in some possible implementations of the first aspect, the first uplink resource is a physical uplink control channel PUCCH resource or a physical uplink shared channel PUSCH resource.

In a second aspect, a method for recovering from communication failure is provided, the method comprising: the network equipment receives first indication information sent by the terminal equipment on first uplink resources, wherein the first indication information is used for indicating communication failure on first downlink resources, and the first uplink resources are resources used for bearing Channel State Information (CSI); wherein the first uplink resource belongs to a first cell, the first downlink resource belongs to a second cell, and the first cell and the second cell are different cells or the same cell; alternatively, the spatial correlation parameter associated with the first downlink resource is different from the spatial correlation parameter associated with the first uplink resource.

With reference to the second aspect, in some possible implementations of the second aspect, the first indication information is carried in padding bits of the CSI; or, the first indication information is carried in a non-zero wideband amplitude coefficient word field of the CSI; alternatively, the CSI comprises a channel quality indicator, CQI, field, the first indication information being carried in a status bit of the CQI field.

With reference to the second aspect, in certain possible implementations of the second aspect, the method further includes: the network device receives, on the first uplink resource, second indication information sent by the terminal device, where the second indication information includes one or more of identification information of the second cell, resource information of a first reference signal with channel quality greater than or equal to a first preset threshold, or resource information of a second reference signal with channel quality less than or equal to a second preset threshold.

With reference to the second aspect, in some possible implementations of the second aspect, the second indication information is carried in a field corresponding to the lowest priority content of the CSI.

With reference to the second aspect, in some possible implementations of the second aspect, the CQI field includes a wideband CQI field, and the first indication information is carried in a lowest state bit of the wideband CQI field.

With reference to the second aspect, in some possible implementations of the second aspect, the CQI field includes a wideband CQI field and a subband CQI field, and the first indication information is carried in a status bit of the combination of the wideband CQI field and the subband CQI field.

With reference to the second aspect, in some possible implementations of the second aspect, the first downlink resource is a physical downlink control channel PDCCH resource.

With reference to the second aspect, in some possible implementations of the second aspect, the first uplink resource is a physical uplink control channel PUCCH resource or a physical uplink shared channel PUSCH resource.

In a third aspect, a method for recovering from communication failure is provided, the method comprising: the terminal equipment sends first indication information to the network equipment on the second uplink resource, wherein the first indication information is used for indicating the communication failure of the terminal equipment on the first downlink resource; the terminal equipment detects communication failure response information in an nth time unit after the first indication information is sent and/or in a time window when an mth time-frequency resource for sending a downlink control channel starts, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource; wherein n is an integer greater than or equal to 0, m is an integer greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or the spatial related parameter associated with the second uplink resource is different from the spatial related parameter associated with the second downlink resource.

In some possible implementations, the time-frequency resource location may be a time-frequency resource location of the fourth cell used for transmitting the downlink control channel.

It should be understood that the first indication information may also be link failure recovery request (beam failure recovery request, BFRQ) information, where the BFRQ information is used to request recovery of a link failure between the terminal device and the network device.

Specifically, the BFRQ information is used to restore a link between the terminal device and the network device in the fourth cell, or the BFRQ information is used to restore a link between the terminal device and another network device in the fourth cell.

It should also be appreciated that the communication failure response information may be link failure recovery response (beam failure recovery response, BFRR) information, which is a response sent by the network device to the BFRQ information.

Specifically, the BFRR information is a response to the BFRQ information sent by the network device on the resource of the fourth cell, or the BFRR information is a response to the BFRQ information sent by another network device on the resource of the fourth cell.

In some possible implementations, the first downlink resource and the second downlink resource belong to the same cell.

In some possible implementations, the third cell and the fourth cell belong to the same cell group, or the third cell and the fourth cell belong to different cell groups.

In some possible implementations, the first downlink resource is a physical downlink control channel, PDCCH, resource.

In some possible implementations, the second downlink resource is a physical downlink control channel, PDCCH, resource.

In some possible implementations, the second uplink resource is a physical random access channel, PRACH, resource.

In some possible implementations, the second uplink resource is a resource used for transmitting channel state information CSI between the network device and the terminal device.

In some possible implementations, the second uplink resource is a physical uplink control channel PUCCH resource or a physical uplink shared channel PUSCH resource.

It should be appreciated that the first indication information may be multiplexed or punctured in some status bits of CSI, and specific multiplexing or puncturing manners may refer to some implementations of the first aspect described above.

According to the communication failure recovery method, the network equipment indicates the received communication failure response information to the terminal equipment, so that the terminal equipment can be guaranteed to detect the communication failure response information.

With reference to the third aspect, in some possible implementations of the third aspect, the method further includes: the terminal equipment determines the n or the m according to the system parameters of the third cell and/or the fourth cell.

In some possible implementations, the system parameters (numerologies) include subcarrier spacing (subcarrier spacing, SCS) and/or Cyclic Prefix (CP).

In some possible implementations, the determining, by the terminal device, the n or the m according to the system parameters of the third cell and/or the fourth cell includes:

the terminal equipment determines the n or the m according to the system parameters of the uplink carrier of the third cell and/or the system parameters of the downlink carrier of the fourth cell; or alternatively comprises: and the terminal equipment determines the n or the m according to the system parameter of the uplink carrier of the third cell and/or the system parameter of the downlink carrier of the third cell and/or the system parameter of the uplink carrier of the fourth cell and/or the system parameter of the downlink carrier of the fourth cell.

Or comprises: and the terminal equipment is determined according to the system parameters of the second uplink resources and/or the system parameters of the second downlink resources.

Alternatively, in the above implementation, the system parameter may be replaced by a subcarrier spacing.

In some possible implementations: the terminal equipment determines the n or the m according to the system parameters of the uplink carrier of the third cell and the system parameters of the downlink carrier of the fourth cell, and comprises

The terminal equipment determines the n or the m according to the minimum value of the system parameter of the uplink carrier of the third cell and the system parameter of the downlink carrier of the fourth cell; or alternatively

The terminal equipment determines the n or the m according to the maximum value of the system parameters of the uplink carrier of the third cell and the system parameters of the downlink carrier of the fourth cell; or alternatively

The terminal equipment determines the n or the m according to the minimum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell; or alternatively

And the terminal equipment determines the n or the m according to the maximum value of the subcarrier interval of the uplink carrier of the third cell and the subcarrier interval of the downlink carrier of the fourth cell.

In some possible implementations: the terminal device determining the n or the m according to the system parameter of the uplink carrier of the third cell and/or the system parameter of the downlink carrier of the third cell and/or the system parameter of the uplink carrier of the fourth cell and/or the system parameter of the downlink carrier of the fourth cell, including:

The terminal equipment determines the n or the m according to the system parameter of the uplink carrier of the third cell and/or the system parameter of the downlink carrier of the third cell and/or the minimum value of the system parameter of the uplink carrier of the fourth cell and/or the system parameter of the downlink carrier of the fourth cell; or alternatively

The terminal equipment determines the n or the m according to the system parameter of the uplink carrier of the third cell and/or the system parameter of the downlink carrier of the third cell and/or the system parameter of the uplink carrier of the fourth cell and/or the maximum value of the system parameter of the downlink carrier of the fourth cell; or alternatively

The terminal equipment determines the n or the m according to the minimum value of the subcarrier spacing of the uplink carrier of the third cell and/or the subcarrier spacing of the downlink carrier of the third cell and/or the subcarrier spacing of the uplink carrier of the fourth cell and/or the subcarrier spacing of the downlink carrier of the fourth cell; or alternatively

And the terminal equipment determines the n or the m according to the subcarrier spacing of the uplink carrier of the third cell and/or the subcarrier spacing of the downlink carrier of the third cell and/or the subcarrier spacing of the uplink carrier of the fourth cell and/or the maximum value of the subcarrier spacing of the downlink carrier of the fourth cell.

In some possible implementations: the determining, by the terminal device, according to the system parameter of the second uplink resource and the system parameter of the second downlink resource includes:

the terminal equipment determines the n or the m according to the minimum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

And the terminal equipment determines the n or the m according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource.

It should be understood that in the embodiment of the present application, the system parameters including the subcarrier spacing may be replaced by: the system parameter indicates a subcarrier spacing.

In some possible implementations, the terminal device determines the n or the m according to system parameters of the third cell and/or the fourth cell, and/or capabilities of the terminal device.

In some possible implementations, the terminal device determines the n or the m according to a subcarrier spacing of the third cell and/or the fourth cell.

In some possible implementations, the n (or the m) is proportional to the subcarrier spacing of the third cell and/or the fourth cell.

In some possible implementations, the terminal device determines the n or the m according to a subcarrier spacing of the third cell.

In some possible implementations, the terminal device determines the n or the m according to a subcarrier spacing of the fourth cell.

In some possible implementations, the terminal device determines the n or the m according to subcarrier spacing of the third cell and the fourth cell.

In some possible implementations, the subcarrier spacing of the downlink carrier of the third cell is X, the subcarrier spacing of the downlink carrier of the fourth cell is Y, when the communication failure of the third cell is recovered on the third cell, the terminal device detects the communication failure response information on the third cell after sending W time units of the communication failure recovery request information, and then when the communication failure recovery request information of the fourth cell is sent through the third cell, the starting time of detecting the communication failure response information on the fourth cell is determined by the X, Y and W.

In some possible implementations, n= (y×w)/X, or n is a positive integer greater than (y×w)/X.

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

The terminal equipment receives third indication information;

the terminal device determines the n or the m according to the third indication information.

In some possible implementations, the third indication information is carried on a third downlink resource, where the third downlink resource is a physical downlink control channel PDCCH resource or a physical downlink shared channel PDSCH resource.

In some possible implementations, the terminal device receives third indication information sent by the network device on the first time-frequency resource.

In some possible implementations, the first time-frequency resource is determined by a set of control resources and/or a set of search spaces.

With reference to the third aspect, in some possible implementations of the third aspect, the third indication information includes one or more of information indicating a start time of receiving the communication failure response information, identification information of the fourth cell, identification information of a control resource set for receiving the communication failure response information, or identification information of a search space set for receiving the communication failure response information.

In some possible implementations, if the network device in which the third cell is located is the network device, the network device in which the fourth cell is located is another network device, and the starting time of the terminal device for receiving the communication failure response information is determined by the network device according to the time delay between the first network device and the another network device.

In some possible implementations, if the network devices in which the third cell and the fourth cell are located are both the network devices, the starting time of the terminal device for receiving the communication failure response information is determined by the internal delay of the network device.

In some possible implementations, the terminal device receives the communication failure response information on the fourth cell.

In some possible implementations, the terminal device receives the communication failure response information on a second time-frequency resource.

In some possible implementations, the second time-frequency resource is determined by a set of control resources and/or a set of search spaces.

According to the communication failure recovery method, the network equipment sends the information of the starting time of receiving the communication failure response information to the terminal equipment, so that the terminal equipment can be helped to ensure that the terminal equipment detects the communication failure response information.

With reference to the third aspect, in some possible implementations of the third aspect, the third indication information is carried in one or more of downlink control information DCI, a medium access control layer control element MAC CE, or radio resource control RRC signaling.

In some possible implementations, the network device transmits the DCI to the terminal device on a set of control resources dedicated to transmitting communication failure response information and/or a set of search spaces dedicated to transmitting communication failure response information; or the network device transmits the MAC CE, RRC on PDSCH resources scheduled by PDCCH carried on the set of control resources dedicated to transmitting the communication failure response information and/or the set of search spaces dedicated to transmitting the communication failure response information. Optionally, the set of control resources and/or the set of search spaces and/or the PDSCH are resources of a fourth cell configured for the network device.

With reference to the third aspect, in some possible implementations of the third aspect, the third indication information is carried in DCI, where the DCI is signaling dedicated to instruct the terminal device to receive the communication failure response information.

In some possible implementations, the DCI is a signaling that includes only information for instructing the terminal device to receive the communication failure response information.

With reference to the third aspect, in some possible implementations of the third aspect, the third indication information is carried in a field of DCI, where the DCI is used for transmission of uplink data or downlink data.

In some possible implementations, the DCI format is a DCI format in NR.

With reference to the third aspect, in some possible implementations of the third aspect, the field is carried in a time-frequency resource indicator field in the DCI.

In some possible implementations, the terminal device is instructed to receive the communication failure response information when the time domain resource indicator and/or the frequency domain resource indicator field are all 0.

In a fourth aspect, a method of communication failure is provided, the method comprising: the network equipment receives first indication information sent by the terminal equipment on the second uplink resource, wherein the first indication information is used for indicating the communication failure of the terminal equipment on the first downlink resource; the network equipment sends communication failure response information to the terminal equipment in an x time unit after receiving the first indication information and/or in a time window when a time frequency resource for sending a downlink control channel starts, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource; wherein x is an integer greater than or equal to 0, y is an integer greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells; or, the spatial correlation parameter associated with the second uplink resource is different from the spatial correlation parameter associated with the second downlink resource.

It should be understood that the communication failure response information may also be understood as a response to the first indication information carried on the third downlink resource.

In some possible implementations, the method further includes: the network device sends information of a first reference signal, wherein the first reference signal is a reference signal with channel quality being greater than or equal to a first preset threshold.

In some possible implementations, the network device in which the third cell is located is the network device, and the network device in which the fourth cell is located is another network device, and the method further includes: the network device transmits information of the first reference signal to the other network device.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the method further includes: the network device determines the x or the y according to the system parameters of the third cell and/or the fourth cell.

In some possible implementations, the system parameter includes a subcarrier spacing, and the network device determines the x or the y according to a system parameter of the third cell and/or the fourth cell, including:

the network equipment determines the x or the y according to the minimum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

And the network equipment determines the x or the y according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the method further includes: the network device sends third indication information to the terminal device, where the third indication information is used to instruct the terminal device to receive the communication failure response information.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the third indication information includes one or more of information indicating a start time of receiving the communication failure response information, identification information of the fourth cell, identification information of a control resource set for receiving the communication failure response information, or identification information of a search space set for receiving the communication failure response information.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the third indication information is carried in one or more of downlink control information DCI, a medium access control layer control element MAC CE, or radio resource control RRC signaling.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the third indication information is carried in DCI, which is signaling dedicated to instructing the terminal device to receive the response information.

With reference to the fourth aspect, in some possible implementations of the fourth aspect, the third indication information is carried in a field of DCI, where the DCI is used for transmission of uplink data or downlink data.

With reference to the fourth aspect, in some possible implementations of the fifth aspect, the field is carried in a time-frequency resource indicator field in the DCI.

In a fifth aspect, a communication failure method is provided, including: the terminal equipment sends first indication information to the network equipment in a p-th time unit on a second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource;

the terminal equipment detects communication failure response information in a time window from a q-th time unit or a q-th time unit, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource;

wherein p is a number greater than or equal to 0, q is a number greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or the spatial related parameter associated with the second uplink resource is different from the spatial related parameter associated with the second downlink resource;

The p-th time unit is a time unit determined according to the system parameter of the third cell and/or the system parameter of the fourth cell;

the q-th time unit is a time unit determined according to the p, and/or the system parameter of the third cell, and/or the system parameter of the fourth cell.

Optionally, the p-th time unit is a p-th time unit of an uplink of the third cell.

Optionally, the q time unit is a q time unit of a downlink of the fourth cell.

In some possible implementations, the p time units are time units determined according to a system parameter of an uplink carrier of the third cell; or alternatively

The p time units are time units determined according to the system parameters of the second uplink resource; or alternatively

The p time unit is a time unit determined according to the system parameter of the third uplink resource of the third cell;

and the p time unit is a time unit determined according to the system parameter of the uplink resource with the minimum system parameter in all the uplink resources of the third cell.

In some possible implementations, the q-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

The q-th time unit is a time unit determined according to the system parameters of the second uplink resource and the system parameters of the second downlink resource; or alternatively

The q-th time unit is determined according to the system parameters of the third uplink resource of the third cell and the system parameters of the third downlink resource of the fourth cell; or alternatively

The q-th time unit is a time unit determined according to the system parameter of the uplink carrier of the third cell, the system parameter of the downlink carrier of the fourth cell and the p; or alternatively

The q-th time unit is a time unit determined according to the system parameter of the second uplink resource, the system parameter of the second downlink resource and the p; or alternatively

The q-th time unit is a time unit determined according to the system parameter of the third uplink resource of the third cell, the system parameter of the third downlink resource of the fourth cell and the p.

In some possible implementations, q is determined by any one of the following formulas;

alternatively, q is determined by any one of the following formulas:

wherein,for the lower rounding operation, ++>Performing rounding operation; an integer of K greater than or equal to 0; the mu 1 is the system parameter of the uplink carrier of the third cell, or the mu 1 is the second The system parameter of the uplink resource, or μ1 is the system parameter of the third uplink resource of the third cell; μ2 is a system parameter of a downlink carrier of the fourth cell, or μ2 is a system parameter of a second downlink resource of the fourth cell; alternatively, μ2 is a system parameter of the third downlink resource of the fourth cell.

Where q is the number of time units determined by which system parameter, and K1 are the number of time units determined by which system parameter. For example, q is the number of time units of the downlink subcarrier of the fourth cell, and K, K1 is the number of time units of the downlink subcarrier of the fourth cell. Wherein Z may be sent by the network device or predefined or reported by the terminal capability, and Z may represent a duration, such as a duration of several milliseconds. And K or Z is a positive integer.

Wherein K is predefined or reported by the terminal device capability or indicated by the network device (e.g. indicated by the third indication information), e.g. K is 4 slots.

Wherein Z is predefined or reported by the terminal device capability or indicated by the network device (e.g. indicated by the third indication information), and optionally, z=4.

Wherein k1 is a predefined integer greater than or equal to 0. Alternatively k1=1 or 0.

Optionally, the K is based on the number of time units determined by the system parameter of the downlink carrier of the fourth cell or the system parameter of the second downlink resource of the fourth cell or the system parameter of the third downlink resource of the fourth cell.

In some implementations, the p-th time unit is a p-th time unit of an uplink of the third cell.

Optionally, the q-th time unit is a q-th time unit of an uplink of the third cell.

The terminal equipment determines q according to the system parameters of the third cell, and the method comprises the following steps:

the terminal equipment determines the q according to the system parameters of the uplink carrier wave of the third cell; or alternatively

The terminal equipment determines the q according to the system parameters of the second uplink resource; or alternatively

The terminal equipment determines the q according to the system parameters of the third uplink resource of the third cell;

and the terminal equipment determines the q according to the system parameters of the uplink resource with the minimum system parameters of all the uplink resources of the third cell.

In some possible implementations, q may be determined by the following formula:

q＝p+K

where K1 is a predefined number being an integer, alternatively k1=1 or 0, referring to K1 time units of the uplink of the third cell. Alternatively, q is the number of time units determined by which system parameter, and K is the number of time units determined by which system parameter, where K is predefined or reported by the terminal device capability or indicated by the network device (e.g., indicated by the third indication information), e.g., K is 4 slots.

In a sixth aspect, a communication failure method is provided, including: the network equipment sends first indication information to the receiving terminal equipment in a t-th time unit on a second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource;

the network equipment sends communication failure response information to the terminal equipment in an s time unit or a time window from the s time unit, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource;

wherein t is a number greater than or equal to 0, s is a number greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or the spatial related parameter associated with the second uplink resource is different from the spatial related parameter associated with the second downlink resource;

the t time unit is a time unit determined according to the system parameter of the third cell and/or the system parameter of the fourth cell;

the s-th time unit is a time unit determined according to the t and/or the system parameter of the third cell and/or the system parameter of the fourth cell.

In some possible implementations, the t time units are time units determined according to a system parameter of an uplink carrier of the third cell; or alternatively

The t time units are time units determined according to the system parameters of the second uplink resource; or alternatively

The t time unit is a time unit determined according to the system parameters of the third uplink resource of the third cell;

and the t time unit is a time unit determined according to the system parameter of the uplink resource with the minimum system parameter in all the uplink resources of the third cell.

In some possible implementations, the s-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

The s-th time unit is a time unit determined according to the system parameters of the second uplink resource and the system parameters of the second downlink resource; or alternatively

The s-th time unit is determined according to the system parameters of the third uplink resource of the third cell and the system parameters of the third downlink resource of the fourth cell; or alternatively

The s-th time unit is a time unit determined according to the system parameter of the uplink carrier of the third cell, the system parameter of the downlink carrier of the fourth cell and the t; or alternatively

The s-th time unit is a time unit determined according to the system parameter of the second uplink resource, the system parameter of the second downlink resource and the t; or alternatively

The s-th time unit is a time unit determined according to the system parameter of the third uplink resource of the third cell, the system parameter of the third downlink resource of the fourth cell and the t.

In some possible implementations, s is determined by any one of equation (6), equation (7), equation (8), equation (9), or equation (10);

wherein,for the lower rounding operation, ++>Performing rounding operation; l is an integer greater than or equal to 0; the μ1 is a system parameter of an uplink carrier of the third cell, or the μ1 is a system parameter of a second uplink resource, or the μ1 is a system parameter of a third uplink resource of the third cell; μ2 is a system parameter of a downlink carrier of the fourth cell, or μ2 is a system parameter of a second downlink resource of the fourth cell; alternatively, μ 2 is the third of the fourth cellSystem parameters of downlink resources.

In some possible implementations, in the fifth and sixth aspects,can be replaced by->The f1 is a subcarrier spacing of an uplink carrier of the third cell, or the f1 is a subcarrier spacing of a second uplink resource, or the f1 is a subcarrier spacing of a third uplink resource of the third cell; f2 is the subcarrier spacing of the downlink carrier of the fourth cell, or f2 is the subcarrier spacing of the second downlink resource of the fourth cell; or, f2 is a subcarrier spacing of a third downlink resource of the fourth cell. Where f1 and f2 are equivalent to Δf in table 7.

In a seventh aspect, there is provided an apparatus for communication failure recovery, the apparatus comprising means for performing the steps in the method of the first aspect or any of the possible implementations of the first aspect, or means for performing the steps in the method of the third aspect or any of the possible implementations of the third aspect, or means for performing the steps in the method of the fifth aspect or any of the possible implementations of the fifth aspect.

An eighth aspect provides an apparatus for communication failure recovery, the apparatus comprising means for performing each step in the method of the second aspect or any possible implementation of the second aspect, or means for performing each step in the method of the fourth aspect or any possible implementation of the fourth aspect, or means for performing each step in the method of the sixth aspect or any possible implementation of the sixth aspect.

In a ninth aspect, there is provided an apparatus for communication failure recovery, the apparatus comprising: a transceiver, a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any one of the possible implementations of the first aspect, or the method of the third aspect or any one of the possible implementations of the third aspect, or the method of the fifth aspect or any one of the possible implementations of the fifth aspect.

In a tenth aspect, there is provided an apparatus for communication failure recovery, the apparatus comprising: a transceiver, a memory, and a processor. Wherein the transceiver, the memory and the processor are in communication with each other via an internal connection path, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and when the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the second aspect or any one of the possible implementations of the second aspect, or the method of the fourth aspect or any one of the possible implementations of the sixth aspect.

In an eleventh aspect, there is provided a system for recovering from communication failure, the system comprising the apparatus provided in the seventh aspect and the apparatus provided in the eighth aspect; or alternatively

The system comprises the device provided in the ninth aspect and the device provided in the tenth aspect.

A twelfth aspect provides a computer program product comprising a computer program for performing the method of the first aspect or any possible implementation of the first aspect, or the method of the third aspect or any possible implementation of the third aspect, or the method of the fifth aspect or any possible implementation of the fifth aspect, when executed by a processor.

In a fourteenth aspect, a computer program product is provided, comprising a computer program for performing the method of the second aspect or any of the possible implementations of the second aspect, or the method of the fourth aspect or any of the possible implementations of the sixth aspect, or the method of the sixth aspect or any of the possible implementations of the sixth aspect, when being executed by a processor.

A fifteenth aspect provides a computer readable storage medium having stored therein a computer program for performing the method of the first aspect or any possible implementation of the first aspect, or the method of the third aspect or any possible implementation of the third aspect, or the method of the fifth aspect or any possible implementation of the fifth aspect, when the computer program is executed.

A sixteenth aspect provides a computer readable storage medium having stored therein a computer program for performing the method of the second aspect or any of the possible implementations of the second aspect, or for performing the method of the fourth aspect or any of the possible implementations of the sixth aspect, or for performing the method of the sixth aspect or any of the possible implementations of the sixth aspect, when the computer program is executed.

Drawings

Fig. 1 is a schematic diagram of a communication system to which embodiments of the present application are applicable.

Fig. 2 is another schematic diagram of a communication system to which embodiments of the present application are applicable.

Fig. 3 is a schematic flow chart of a communication failure recovery procedure provided in an embodiment of the present application.

Fig. 4 is a schematic flow chart of a method for communication failure recovery provided by an embodiment of the present application.

Fig. 5 is another schematic flow chart diagram of a method for communication failure recovery provided by an embodiment of the present application.

Fig. 6 is a schematic block diagram of an apparatus for communication failure recovery provided by an embodiment of the present application.

Fig. 7 is another schematic block diagram of an apparatus for communication failure recovery provided by an embodiment of the present application.

Fig. 8 is a further schematic block diagram of an apparatus for communication failure recovery provided by an embodiment of the present application.

Fig. 9 is a further schematic block diagram of an apparatus for communication failure recovery provided by an embodiment of the present application.

Fig. 10 is a further schematic block diagram of an apparatus for communication failure recovery provided by an embodiment of the present application.

Detailed Description

Terms in the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (univeRMal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, future fifth generation (5th generation,5G) mobile communication system or New Radio (NR), etc., the 5G mobile communication system described herein includes a non-stand alone Networking (NSA) 5G mobile communication system and/or a stand alone networking (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 terminal device in the embodiments of the present application may refer to a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc., as the embodiments of the application are not limited in this respect.

The network device in the embodiments of the present application is a device in a wireless network, such as a radio access network (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 and reception point (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, etc. In one network architecture, the network devices may include Centralized Unit (CU) nodes, or Distributed Unit (DU) nodes, or RAN devices including CU nodes and DU nodes.

In the embodiment of the application, the terminal device or the network device includes a hardware layer, an operating system layer running above the hardware layer, and an application layer running above the operating system layer. The hardware layer includes hardware such as a central processing unit (central processing unit, CPU), a memory management unit (memory management unit, MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processes through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address book, word processing software, instant messaging software and the like. Further, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided in the embodiment of the present application, as long as the communication can be performed by the method provided in the embodiment of the present application by running the program recorded with the code of the method provided in the embodiment of the present application, and for example, the execution body of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

Furthermore, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, or magnetic strips, etc.), optical disks (e.g., compact disk, CD, digital versatile disk, digital versatile disc, DVD, etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory, EPROM), cards, sticks, or key drives, etc. Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 is a communication system 100 suitable for use with the present application. The communication system 100 is in a single carrier scenario or carrier aggregation scenario (carrier aggregation, CA), the communication system 100 includes a network device 110 and a terminal device 120, the network device 110 and the terminal device 120 communicate through a wireless network, when the terminal device 120 detects that a link between the network device 110 and the terminal device 120 fails, the terminal device 120 sends a link failure recovery request (beam failure recovery request, BFRQ) to the network device 110, and after the network device 110 receives the BFRQ, sends a link failure recovery response (beam failure recovery response, BFRR) to the terminal device 120.

It should be understood that, in fig. 1, the network device 110 may include multiple cells, for example, a first cell and a second cell, where the first cell may assist the second cell in performing link recovery if the terminal device and the network device fail in a link of the second cell, 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 100 is uplink, the terminal device 120 is a transmitting end, the network device 110 is a receiving end, and when the transmission direction of the communication system 100 is downlink, the network device 110 is a transmitting end, and the terminal device 120 is a receiving end.

Fig. 2 is a communication system 200 suitable for use with the present application. The communication system 200 is in a dual link (dual connectivity, DC) or coordinated multi-point transmission (coordinated multipoint transmission/reception, coMP) scenario, the communication system 200 comprises a network device 210, a network device 220 and a terminal device 230, the network device 210 is a network device when the terminal device 230 is initially accessed, responsible for RRC communication with the terminal device 230, and the network device 220 is added at the time of RRC reconfiguration to provide additional radio resources. The terminal device 230 configured with Carrier Aggregation (CA) is connected to the network device 210 and the network device 220, and a link between the network device 210 and the terminal device 230 may be referred to as a first link and a link between the network device 220 and the terminal device 230 may be referred to as a second link.

When both network device 210 and network device 220 may configure uplink resources for transmitting BFRQ to terminal device 230, when the first link or the second link fails, terminal device 230 may send BFRQ to network device 210 or network device 220 on the uplink resources for transmitting BFRQ, and after receiving the BFRQ, network device 210 or network device 220 sends BFRR to terminal device 230.

In particular, if the network device 220 does not configure uplink resources for transmitting BFRQ, the terminal device 230 may restore the second link through the network device 210 when the second link fails.

The above-mentioned communication system to which the present application is applied is merely an example, and the communication system to which the present application is applied is not limited thereto, and for example, the number of network devices and terminal devices included in the communication system may 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.

In order to facilitate understanding of the present application, before introducing the method for recovering from communication failure provided in the present application, a brief description will be first made of concepts related to the present application.

1. Control resource set (control resource set, CORESET)

In order to improve the efficiency of blind detection control channel of terminal equipment, the concept of controlling resource set is provided in the NR standard making process. The network device may configure the terminal device with one or more resource sets for transmitting physical downlink control channels (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. In addition, the network device needs to inform the terminal device about the associated other configurations of the set of control resources, such as a set of search spaces, etc. There are differences in configuration information, such as frequency domain width differences, time domain length differences, etc., for each control resource set. The control resource set in the present application may be a CORESET or control region (control region) defined by the 5G mobile communication system or an enhanced-physical downlink control channel (ePDCCH) set (set) in an expandable manner.

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

In NR, the downlink control region can be flexibly configured by RRC signaling through a control resource set (control resource set, core) and a search space set (search space set):

the control resource set can configure information such as frequency domain position of PDCCH or control channel element (control channel element, CCE), continuous symbol number (maximum value is 3) of time domain, and the like;

the search space set may configure information such as a detection period of the PDCCH and an offset, a start symbol in one slot, and the like.

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

2. QCL information

Quasi-co-station/quasi-co-located QCL hypothesis information may also be referred to as position-location (QCL) information, where the QCL information is used to assist in describing the terminal device's reception beamforming information and reception procedure.

QCL information is used to indicate the QCL relationship between two reference signals, where the target reference signal may typically be a demodulation reference signal (demodulation reference signal, DMRS), a channel state information reference signal (channel state information reference signal, CSI-RS), etc., and the reference signal or source reference signal being referenced may typically be a CSI-RS, a tracking reference signal (tracking reference signal, TRS), a synchronization signal broadcast channel block (synchronous signal/PBCH block, SSB), etc.

spatial relationship: the spatial related information is used for assisting in describing beamforming information and a transmitting flow 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, wherein the target reference signal may be generally a DMRS, SRS, etc., and the reference signal or source reference signal to be cited may be generally CSI-RS, SRS, SSB, etc.

It should be appreciated that the spatial characteristic parameters of two reference signals or channels satisfying the QCL relationship are identical, so that the spatial characteristic parameters of the target reference signal can be inferred based on the source reference signal resource index.

It should also be appreciated that the spatial characteristic parameters of two reference signals or channels that satisfy the spatial correlation information are the same, so that the spatial characteristic parameters of the target reference signal can be inferred based on the source reference signal resource index.

Wherein the spatial characteristic parameter comprises one or more of the following parameters:

angle of arrival (AoA), main (domino) angle of incidence AoA, average angle of incidence, power angle spectrum of incidence (power angular spectrum, PAS), exit angle (angle of departure, aoD), main exit angle, average exit angle, power angle spectrum of exit angle, 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 shift), spatial receive parameters (spatial Rx parameters), and the like.

These spatial characteristics parameters describe the spatial channel characteristics between the antenna ports of the source reference signal and the target reference signal, which helps 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 received beam information of the source reference signal indicated by the QCL information; these spatial characteristics also assist the terminal device in performing transmit side beamforming or transmit processing based on the spatial correlation information, it being understood that the terminal device may transmit the target reference signal based on transmit beam information of the source reference signal indicated by the spatial correlation information.

In order to save QCL information indication overhead of the network device to the terminal device, as an alternative implementation manner, the network device may indicate that one or more of demodulation reference signals of a PDCCH or a physical downlink shared channel (physical downlink shared channel, PDSCH) and a plurality of reference signal resources previously reported by the terminal device satisfy a QCL relationship, for example, the reference signals may be CSI-RS. Here, each reported CSI-RS resource index corresponds to a transceiver beam pair previously established based on the CSI-RS resource measurement. It should be understood that the received beam information of two reference signals or channels satisfying the QCL relationship is the same, and the terminal device may infer the received beam information of the received PDCCH or PDSCH according to 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 for the terminal device at the same time, such as QCL types 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

in the examples of the present application, the correspondence of certain parameters may also be applied to the scenario under QCL description.

It should be understood that, in the present application, the scenario suitable for QCL assumption may also be two reference signals, or further, an association relationship between transmission objects.

3. Transmitting configuration indication (transmission configuration indicator, TCI) status

A TCI state (TCI state) may contain one or two referenced reference signals, and an associated QCL type (QCL type). QCL types can be further divided into four categories a/B/C/D, respectively { Doppler shift, doppler spread, average delay, delay spread, spatial Rx parameter }. The TCI state includes QCL information or is used to indicate QCL information.

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

The SS/PBCH block may also be referred to as SSB. Wherein PBCH is an abbreviation for physical broadcast channel (physical broadcast channel). The SSB includes at least one of a primary synchronization signal (primary synchronization signal, PSS), a secondary synchronization signal (secondary synchronization signal, SSS), and a PBCH. The method is mainly used for cell search, cell synchronization and signals carrying broadcast information.

5. 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 technique may be embodied as a digital beamforming technique, an analog beamforming technique, a hybrid digital/analog beamforming technique. 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, probe signals, etc., for example, a transmit beam may refer to a distribution of signal strengths formed in spatially different directions after signals are transmitted through an antenna, and a receive beam may refer to a signal strength distribution of wireless signals received from the antenna in spatially different directions. It is understood that one or more antenna ports forming a beam may also be considered as a 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 transmitting beam of the network device is used for describing the beamforming information of the transmitting side of the network device, the receiving beam of the network device is used for describing the beamforming information of the receiving side of the network device, the transmitting beam of the terminal device is used for describing the beamforming information of the transmitting side of the terminal device, and the receiving beam of the terminal device is used for describing the beamforming information of the receiving side of the terminal device. I.e. the beam is used to describe the beamforming information.

The beam may have a mapping relationship with the virtual antenna port, or may correspond to one or more of a time resource, a space resource, or a frequency domain resource.

Optionally, the beam may also correspond to a reference signal resource (e.g., a beamformed reference signal resource), or beamforming information.

Optionally, the beam may also correspond to information associated with a reference signal resource of the network device, where the reference signal may be CSI-RS, SSB, DMRS, a phase tracking signal (phase tracking reference signal, PTRS), a tracking signal (tracking reference signal, TRS), etc., and the information associated with the reference signal resource may be a reference signal resource identifier, or QCL information (especially QCL of type D), etc. Wherein the reference signal resource identifier corresponds to a transceiver beam pair previously established based on the reference signal resource measurement, and the terminal device can infer beam information through the reference signal resource index.

Optionally, the beam may also correspond to a spatial filter (spatial domain filter), spatial transmission filter (spatial domain transmission filter).

6. Bandwidth region (bandwidth part, BWP)

The network device may configure the terminal device with one or more downlink/uplink bandwidth regions, the BWP being made up of PRBs that are contiguous in the frequency domain, the BWP being a subset within the bandwidth of the terminal device. The minimum granularity of the 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 can only have one active BWP at the same time, and the terminal device can only receive or transmit data/reference signals on active BWP (active BWP).

In this application, in the case of a BWP scenario, a specific BWP may be a set of bandwidths on a specific frequency, or a set of RBs.

7. Reference signal configured for detecting link failure and recovering link failure

In order to detect and recover from link failure, the network device needs to configure the terminal device with a set of reference signal resources (e.g., beam failure detection RS resourceconfig or beam failure detection RS or failure detection resources) for beam failure detection and a set of reference signal resources (candidate beam RS list or candidate beam RS identification resource or beam failure candidate beam resource or candidate beam identification RS) (also referred to as a candidate set of reference signal resources) for recovering the terminal device from link with the network device. In addition, the reference signal for detecting the link failure may be indicated implicitly, and the reference signal associated in the TCI of the PDCCH is used as the reference signal for detecting the link failure, where the reference signal is a reference signal that satisfies the QCL relationship with the DMRS of the PDCCH and is a reference signal that is sent periodically. Wherein, the demodulation reference signal of the RS and the downlink physical control channel PDCCH in beam failure detection RS set satisfy the QCL relationship or use the same TCI state as the PDCCH, and when the channel quality information (such as reference signal received power (reference signal receiving power, RSRP), channel quality indication (channel quality indicator, CQI), block error rate (block error ratio, BLER), signal-to-interference plus noise ratio (signal to Interference plus noise ratio, SINR), signal-to-noise ratio (signal noise ratio, SNR), etc.) of some or all reference signals in the set is lower than a predetermined threshold, it is determined that the communication link is faulty. Wherein being below the predetermined threshold may be W times below the predetermined threshold consecutively or W times below the predetermined threshold for a period of time. Alternatively, the predetermined threshold may be the same as a radio link failure out-of-sync threshold (radio link failure OOS (out of sync)).

In the embodiments of the present application, the communication failure may also be referred to as a communication link failure, a communication failure, a beam failure, or the like. The communication failure means that the signal quality of the reference signal for beam failure detection of the PDCCH is less than or equal to a preset threshold. In the embodiments of the present application, these concepts are the same meaning. After the communication link fails, the terminal device needs to select the reference signal resource with the channel quality information (such as RSRP, RSRQ, CQI, etc.) higher than the predetermined threshold from the candidate reference signal resource set, so as to restore the communication link.

Alternatively, the predetermined threshold may be configured by the network device. Here, beam failure detection RS is a channel quality for a terminal device to detect a certain transmission beam of a network device, which is a beam used when the network device communicates with the terminal device.

Candidate beam identification RS is used by the terminal device to initiate a reference signal set for link reconfiguration after determining that the transmission beam of the network device has a communication link failure.

In the embodiments of the present application, the communication failure may also be referred to as a communication failure, a link failure, a beam failure, a communication link failure, or the like.

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

In a specific implementation, the names of the reference signal resource set for beam failure detection and the reference signal resource set for recovering the link between the terminal device and the network device may also be other names, which are not limited in this application.

In this embodiment of the present application, the communication failure recovery request information may also be referred to as communication failure recovery request information, link failure recovery request information, beam failure recovery request information, communication link failure recovery request information, link reconfiguration request information, and the like.

In this embodiment of the present application, the communication failure recovery response information may also be referred to as communication failure response information, beam failure recovery response information, beam failure response information, communication link failure recovery response information, communication link failure response information, beam failure recovery response information, beam failure response information, link reconfiguration response information, link failure recovery response information, link failure response information, communication failure recovery response information, communication failure response information, reconfiguration response information, and the like.

In this embodiment, optionally, the communication failure recovery request may refer to sending a signal on a resource used to carry the communication failure recovery request, and the communication failure recovery response information may refer to receiving downlink control information (downlink control information, DCI) scrambled by a cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI) by a cyclic redundancy check (cyclic redundancy check, CRC) on a control resource set and/or a search space set used to send the communication failure recovery response, where the communication failure recovery response information may also be scrambled by other information, and this embodiment of the present application is not limited thereto.

It should be understood that, in the embodiments of the present application, names of the communication failure, the communication failure recovery request information, and the communication failure recovery response information may also be other terms, which are not specifically limited in this application.

Fig. 3 shows a schematic flow chart of a communication failure recovery procedure in an embodiment of the present application, and as shown in fig. 3, the communication failure recovery procedure includes:

s310, the terminal device measures the reference signal resource set (beam failure detection RS set) of the beam failure detection, and determines a link failure between the terminal device and the network device.

For example, when the terminal device determines that the channel quality information of all or part of the reference signals in the consecutive N times beam failure detection RS or beam failure detection RS set is less than or equal to the second preset threshold, the terminal device may determine that the link between the terminal device and the network device is failed.

It should be understood that, in the embodiment of the present application, the manner in which the terminal device determines that the link between the terminal device and the network device is failed is not limited to the above example, but may be determined by other determination manners, which is not limited in this application.

S320, the terminal equipment determines a reference signal (new identified beam) with channel quality greater than or equal to a first preset threshold according to the channel quality information of the candidate reference signal set (candidate beam identification RS); the determination herein may be determined by measuring channel quality information of the candidate reference signal set.

S330, the terminal device sends a link failure recovery request (BFRQ) to the network device, where the link failure recovery request information is associated with a reference signal (new identified beam) with a channel quality greater than or equal to the preset threshold, which is identified in S320, and the terminal device may notify new identified beam or reference signal resources to the network device in a display or implicit manner.

It should be understood that in the embodiment of the present application, the terminal device may send the BFRQ to the network device, and restore the link failure between the terminal device and the network device through the network device, or the terminal device may send the BFRQ to another network device, and restore the link failure between the terminal device and the network device through the other network device.

Optionally, the medium access control (media access control, MAC) layer of the terminal device maintains a link failure recovery timer (beam failure recovery timer) and link failure recovery counter (beam failure recovery counter). The link failure recovery timer is used for controlling the time of the whole link failure recovery, the link failure recovery counter is used for limiting the times of the terminal equipment sending the link failure recovery request, and when the link failure recovery counter reaches the maximum value, the terminal equipment considers that the link failure recovery is unsuccessful, and the link failure recovery process is stopped. 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 a preset value.

S340, the network device sends a link failure recovery response (BFRR) to the terminal device, and the terminal device detects a control resource set (core) and a search space set (search space set), and receives the BFRR.

It should be understood that, optionally, the core set and/or the search space set are dedicated core sets and search space sets configured by the network device for the terminal device, and are used for sending, by the network device, downlink control resources for response information of link failure after the terminal device sends a link failure request.

It should be further understood that, in the embodiment of the present application, the time sequence of S310 and S320 in the link failure recovery procedure is not limited, and S310 may precede S320, S320 may precede S310, or S310 and S320 may be performed simultaneously.

It should also be understood that the link failure recovery procedure shown in fig. 3 may also be applied to the link recovery procedure in the single carrier scenario shown in fig. 1, or may also be applied to the link recovery procedure in the carrier aggregation scenario shown in fig. 2, where when the procedure is applied to the link recovery procedure in the carrier aggregation scenario, the network device 210 and the network device 220 are required to configure the terminal device 230 with periodic uplink resources for transmitting the link failure recovery request, where the uplink resources may be physical uplink control channel (physical uplink control channel, PUCCH) resources or physical random access channel (physical random access channel, PRACH) resources.

The network device allocates a special periodic uplink resource overhead for the emergency event due to the link failure. In the scheme of the embodiment of the application, the link failure recovery request is sent through multiplexing or punching the PUCCH or the physical uplink shared channel (physical uplink shared channel, PUSCH) for reporting the channel state information (channel state information, CSI), so that the resource overhead can be effectively saved.

Fig. 4 shows a schematic flow chart of a method 400 of communication failure recovery according to an embodiment of the present application, as shown in fig. 4, the method 400 includes:

s410, the terminal equipment sends first indication information to the network equipment on a first uplink resource, the network equipment receives the first indication information sent by the terminal equipment on the first uplink resource, the first indication information is used for indicating communication failure on the first downlink resource, and the first uplink resource is used for bearing Channel State Information (CSI);

wherein the first uplink resource belongs to a first cell, the first downlink resource belongs to a second cell, and the first cell and the second cell are different cells or the same cell; alternatively, the spatial correlation parameter associated with the first downlink resource is different from the spatial correlation parameter associated with the first uplink resource.

Optionally, the terminal device sends the first indication information to the first network device on the first uplink resource, and the communication failure is that the terminal device and the second network device fail to communicate in the second cell.

Alternatively, the first uplink resource may include one or more of a time domain resource, a frequency domain resource, a spatial resource, and a beam resource.

It should be understood that the first uplink resource belongs to the first cell, which may be a cell under the first network device.

Optionally, before the terminal device sends the first indication information to the first network device, the method further includes:

s401, the terminal device determines that communication on the first downlink resource fails.

Optionally, the terminal device determines that the communication between the terminal device and the second network device fails in a second cell, and the first downlink resource belongs to the second cell.

Optionally, the CSI information includes one or more of a reference signal resource index (e.g., channel state information reference signal resource indication (channel state information reference resource indication, CRI)), a Rank Indication (RI), a Layer Indication (LI), a precoding indication (precoding matrix indicator, PMI), and a Channel Quality Indication (CQI).

It should be appreciated that the first indication information may correspond to the BFRQ information in fig. 3, which is used to request recovery of a link failure between the terminal device and the second network device.

In particular, the BFRQ information may be used to restore a link between the terminal device and the second network device at the second cell. It should be understood that the BFRQ may also be a piece of other information for restoring the link between the terminal device and the second network device in the second cell. The BFRQ may also be an indication information for link failure recovery.

Optionally, the first network device and the second network device are the same network device.

It should be understood that the communication failure on the first downlink resource may be understood that the channel quality of the reference signal for beam failure detection of the second network device is less than or equal to a preset threshold, or meets other conditions.

Specifically, the communication failure on the first downlink resource is that the channel quality of the reference signal used for beam failure detection of the second network device in the second cell is less than or equal to a preset threshold, or other conditions are satisfied.

It should also be understood that the first downlink resource may be a downlink resource configured by the second network device for the terminal device, and may also be a downlink resource configured by the first network device for the terminal device.

Specifically, the first downlink resource may be a downlink resource configured by the second network device in the second cell for the terminal device, or may be a downlink resource configured by the first network device in the second cell for the terminal device.

Alternatively, the first network device may be a primary network device of the terminal device, and the second network device may be one of a plurality of secondary network devices of the terminal device.

In one embodiment, the first network device may be a primary base station and the second network device may be a secondary base station; or the first network device may be a secondary base station and the second network device may be a primary base station.

In this embodiment of the present application, the first network device may be a base station where a primary cell/primary serving cell (primary cell/primary serving cell, pcell) is located, a base station where a secondary primary cell (primary secondary cell, PScell) is located, a base station where a special cell (specific cell, SPcell) is located, or may be a base station where a transmission receiving node (transmission and reception point, TRP) is located, and a secondary cell/secondary serving cell (secondary cell/secondary serving cell, scell) is located, and the second network device may be a base station where Scell is located, or may be TRP. Alternatively, the first network device may be a base station where TRP and Scell are located, and the second network device may be a base station where Pcell, PScell, SPcell, TRP and Scell are located.

In this embodiment of the present application, the first cell may be a Pcell, a PScell, an SPcell, or a Scell, and the second cell may be a Scell; alternatively, the first cell may be a Scell, and the second cell may be a Pcell, a PScell, an SPcell, or a Scell.

Among them, the explanation about Pcell, PScell, scell and SPcell is as follows:

pcell: the cell in which the terminal device resides in the CA scenario. Typically only Pcell has uplink resources, such as PUCCH channels.

PScell: the primary network device configures a special secondary cell on the secondary network device to the terminal device via RRC connection signaling.

Scell: the cell configured to the terminal device through the RRC connection signaling works on a secondary carrier (SCC) to provide more wireless resources for the terminal device. The SCell may have only downlink, or may have both uplink and downlink.

SPcell: for DC scenarios, SPCell refers to either the Pcell of a primary cell group (master cell group, MSG) or the PScell of a secondary cell group (secondary cell group, SCG); otherwise, as in the CA scenario, SPcell refers to Pcell.

It should be understood that the technical solution in the embodiments 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 and the Scell is high frequency, since the Scell is not configured with uplink resources, and the Pcell is low frequency and is not configured with PRACH resources or PUCCH resources for link failure detection, so that the PUCCH/PUSCH for CSI reporting resources of the Pcell may be used to assist the Scell in link recovery. Typically the low and high frequencies are relatively speaking, but may also be demarcated by a specific frequency, for example 6GHz.

In one embodiment, the terminal device sends first indication information on a first uplink resource on the Pcell, where the first indication information is used to indicate communication failure on a first downlink resource, and the first uplink resource is a CSI resource used to carry information transmission using the Pcell, and the first downlink resource is a CSI resource used to carry information transmission using the Scell. It should be understood that the Pcell and the Scell may also be different carriers of the same base station, e.g. CC1 and CC2.

In one embodiment, the technical solution of the embodiment of the present application may be applied to one cell in a carrier aggregation (carrier aggregation, CA) scenario to assist another cell or multiple cells in recovering links. Or in a DC scenario, one cell within a cell group assists another cell or cells in recovering the link.

In this embodiment of the present application, one cell may belong to the same cell group as another cell, or belong to a different cell group, where the different cell group mainly describes that in the DC scenario, one cell of the cell group 1 may assist another cell of the cell group 2 in recovering the link.

Optionally, the cell in the MCG assists the cell in the SCG to restore the link.

Optionally, the cell in the SCG assists the cell in the MCG in restoring the link.

It should also be understood that in this application, a "cell" may be understood as a "serving cell" or "carrier".

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

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

It should also be understood that, in this application, uplink resources are on the uplink carrier, and the uplink resources include the first uplink resource and the second uplink resource (referred to in method 500); downlink resources on a downlink carrier, the downlink resources including the first downlink resource, the second downlink resource (referred to in method 500), and the third downlink resource (referred to in method 500).

It should also be understood that in this application, the uplink carrier may be a normal uplink carrier, or may be a supplementary uplink (supplementary uplink, SUL) carrier.

In an optional manner, in the embodiment of the present application, if the first cell includes multiple uplink carriers, for example, a first uplink carrier of the first cell, a second uplink carrier of the first cell, and the terminal device may send the first indication information and/or the second indication information on an uplink carrier with a minimum subcarrier spacing in multiple uplink subcarriers of the first cell. If the subcarrier spacing of the first uplink carrier of the first cell is smaller than the subcarrier spacing of the second uplink carrier of the first cell, the terminal device sends the first indication information and/or the second indication information on the first uplink carrier of the first cell. If the third cell includes multiple uplink carriers, such as a first uplink carrier of the third cell and a second uplink carrier of the third cell, the terminal device may send the first indication information on an uplink carrier with a minimum subcarrier spacing among multiple uplink subcarriers of the third cell. If the subcarrier spacing of the first uplink carrier of the third cell is greater than the subcarrier spacing of the second uplink carrier of the third cell, the terminal device sends the first indication information on the second uplink carrier of the third cell. The first uplink resource may be a resource on a first uplink carrier of the first cell, the second uplink resource (involved in the method 500) may be a resource on a second uplink carrier of the third cell, and the first uplink carrier of the first cell or the second uplink carrier of the second cell may be a carrier with a minimum subcarrier spacing, so that the terminal device may send the first indication information and/or the second indication information on the carrier with the minimum subcarrier spacing, thereby improving the probability of successful sending the first indication information, and thus improving the probability of successful link failure recovery. Further, the terminal device may determine, from a carrier set, a carrier with a smallest subcarrier spacing as an uplink carrier for transmitting the first indication information and/or the second indication information, where the carrier set includes a plurality of carriers. In one possible implementation, the carrier set may be a set of uplink carriers configured by the network device to the terminal device; in another possible implementation, the carrier set may be a set of uplink carriers of a primary cell and/or a secondary primary cell configured by the network device to the terminal device.

It should be noted that, the uplink carrier may be replaced by an uplink channel and/or an uplink signal. Wherein, optionally, the uplink channel comprises one or more of the following channels: PUSCH, PUCCH, PRACH; optionally, the uplink signal includes one or more of the following signals: SRS, CSI-RS, DMRS.

In one embodiment, the spatially related parameter differences mainly describe that one TRP assists another TRP in recovering a link in a coordinated multipoint transmission (coordinated multipoint transmission/reception, coMP) scenario. Or in the non-reciprocity scene of a single station, the uplink resource is available, the downlink resource is not available, and the downlink is recovered through the uplink assistance. In this embodiment of the present application, a single-station or multi-station scenario may be represented by a spatial correlation parameter, where the spatial correlation parameter of the downlink resource may correspond to TCI or QCL information (including one or more reference signals), and the spatial correlation parameter of the uplink resource may correspond to spatial correlation (including one or more reference signals). The spatially dependent parameters are equivalent to spatial filters (spatial dimain transmission/receiver filters). Optionally, the spatial filter generally comprises 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, and the like. CoMP includes incoherent joint transmission (non coherent joint transmission, NCJT), coherent joint transmission (coherent joint transmission, cqt), joint transmission (joint transmission, JT), and the like.

In this embodiment of the present application, different spatial correlation parameters refer to that a spatial transmission filter used by a terminal device to transmit information on an uplink resource is different from a spatial reception filter used to receive information on a downlink resource.

The technical scheme of the embodiment of the application can be applied to the situation that the first cell and the second cell belong to the same network equipment, and can also be applied to the situation that the first cell and the second cell belong to different network equipment.

Optionally, the first network device and the second network device are different network devices.

Specifically, the method 400 of the embodiment of the present application may be applied to a dual-link or coordinated multi-point transmission scenario, where a terminal device may be connected to one primary network device and a plurality of secondary network devices, and when a communication failure occurs between one of the plurality of secondary network devices and the terminal device, the terminal device may send the first indication information to the primary network device.

For example, after a communication failure occurs between the terminal device and a certain secondary network device in the second cell, the terminal device may send the first indication information using an uplink resource belonging to the primary network device in the first cell.

Specifically, the method 400 of the embodiment of the present application may also be applied to a carrier aggregation scenario, where the first cell and the second cell may be different cells, for example, after a communication failure occurs in the second cell between the terminal device and the first network device, the terminal device may send the first indication information using an uplink resource belonging to the first network device in the first cell.

Specifically, the method 400 of the embodiment of the present application may also be applied to a single carrier scenario, where the first cell and the second cell may be the same cell, and when a communication failure occurs between the terminal device and the network device in the first cell, the terminal device may use an uplink resource belonging to the network device in the first cell to send the first indication information.

Optionally, the first downlink resource is a physical downlink control channel PDCCH resource.

Optionally, the PDCCH is scrambled by a cell radio network temporary identity (cell radio network temporary identifier, C-RNTI).

Optionally, the first uplink resource is a physical uplink control channel PUCCH resource or a physical uplink shared channel PUSCH resource.

It should be understood that a communication failure on the first downlink resource may also be understood as a link failure or link failure between the terminal device and the second network device.

It should also be understood that the communication failure on the first downlink resource may also be understood as a link failure or a link failure of the terminal device and the second network device in the second cell.

Specifically, after detecting the link failure between the terminal device and the second network device, the terminal device may send the link failure recovery request information on the PUCCH/PUSCH resource preferentially, or if the terminal device does not detect the link failure, send normal CSI-related information on the PUCCH/PUSCH resource.

Alternatively, the terminal device may multiplex (reuse) or puncture (puncture) a special state bit or a lowest state bit in the CSI to transmit the first indication information.

It should be understood that, in the embodiments of the present application, the "status bit" may also have other names, for example, "status value", "index value", "indication bit", "value", and the like, which are not specifically limited in this application.

Optionally, the first indication information is carried in a status bit of a channel quality indication CQI field.

Optionally, the CQI field is a CQI field of a first codeword or a CQI field of a second codeword of CSI feedback.

Alternatively, the CQI of the first codeword and the CQI of the second codeword may be jointly encoded.

Alternatively, the CQI of the first codeword is in part 1 of CSI feedback, the CQI of the second codeword is in part 2 of CSI feedback, and part 1 and part 2 may be separately encoded.

Specifically, the first indication information is distinguished from the CSI by a special state bit or a lowest state bit in the CQI field, more specifically, there are two ways:

mode one

And distinguishing the first indication information from normal CSI information reporting through the lowest state in the broadband CQI word domain or the absolute CQI word domain.

It should be appreciated that in embodiments of the present application, the wideband CQI field may be equivalent to an absolute CQI field.

For example, when the wideband CQI field is the lowest state bit (binary value 0000, or decimal value 0), it indicates that the terminal device has sent the first indication information, or indicates that the content carried on the first uplink resource includes the first indication information.

For another example, when the wideband CQI field is a non-lowest state bit (i.e., a non-0000 state in binary representation and a non-0 state in decimal representation), it indicates that the terminal device does not send the first indication information, or indicates that CSI is carried on the first uplink resource.

It should be appreciated that when the wideband CQI field is transmitted with 4 bits, the lowest state bit of the wideband CQI field may be denoted as 0000, when the wideband CQI field is transmitted with 3 bits, the lowest state bit of the wideband CQI field may be denoted as 000, for example, when the wideband CQI field is denoted as 000, indicating that the terminal device has transmitted the first indication information, or indicating that the first indication information is included in the content carried on the first uplink resource. The first indication information and the normal CSI information may also be reported by different lengths of the status bits, or by other implicit or explicit methods.

It should also be understood that the status bits of the wideband CQI field in the embodiments of the present application may also be transmitted by other numbers of bits, which are not limited in any way by the present application.

Table 1 shows a mapping table of CQI.

Table 1 mapping table of CQI

Table 2 shows another mapping table of CQI.

Table 2 mapping table of CQI

As shown in table 1 and table 2, when the terminal device determines that the communication on the first downlink resource fails, the reported CQI field is 0000, otherwise, the terminal device reports the measurement result (0001-1111) of the CQI to the first network device, and when various tables in the present application are actually applied, only some rows in the tables may be adopted, or in combination with some rows in the tables and other mapping relations, for example, the value of other status bits may also be adopted to indicate that the terminal device sends the first indication information.

Mode two

And distinguishing the first indication information from normal CSI reporting by a state bit of the combination of the state in the broadband CQI word domain and the state bit of the sub-band CQI word domain.

Optionally, the sub-band CQI field is a sub-band differential CQI field, and the sub-band differential CQI field is used to report a differential value of a relative bandwidth CQI of each sub-band CQI.

Alternatively, when the CQI decimal index obtained by combining the wideband CQI with the subband CQI is 0 or negative, it may indicate that the first indication information is sent, or may also indicate that the content carried on the first uplink resource includes the first indication information.

Optionally, the wideband CQI is the lowest state bit and the sub-band CQI is the lower state bit.

Specifically, the lowest state bit of the wideband CQI word field is 0000 (binary) or 0 (decimal), the lower state bit of the subband CQI word field is 00 (binary) or 0 (decimal), or the lower state bit of the subband CQI word field is 01 (binary) or 1 (decimal), or the lower state bit of the subband CQI word field is 10 (binary) or 2 (decimal).

Optionally, the wideband CQI is a next lower state bit and the sub-band CQI is a lower state bit.

It should be understood that the status bits of the sub-band CQI field in the embodiments of the present application may also be transmitted by other numbers of bits, which is not limited in any way in this application. Table 3 shows a sub-band CQI offset level table.

TABLE 3 subband differential CQI and offset level mapping table

For example: the CQI mapping table of table 1 and the sub-band differential CQI table of table 3 are combined.

For each subband index, a 2-bit subband differential CQI is defined as follows:

Sub-band Offset level(s)＝wideband CQI index–sub-band CQI index(s)

the CQI index obtained for the last subband is:

sub-band CQI index(s)＝wideband CQI index–Sub-band Offset level(s)。

when the terminal equipment determines that the communication on the first downlink resource fails, the reported broadband CQI word field is binary 0000 (decimal 0), and the subband CQI word field is binary 00 (decimal 0); or (b)

The reported broadband CQI word field is 0000 (decimal 0), and the subband differential CQI word field is 01 (decimal 1); or (b)

The reported broadband CQI word field is 0000 (decimal 0), and the subband differential CQI word field is 10 (decimal 2); or (b)

The reported wideband CQI word field is 0001 (decimal 1), and the subband differential CQI word field is 01 (decimal 1); or (b)

The reported wideband CQI word field is 0001 (decimal 1), and the subband differential CQI word field is 10 (decimal 2).

Otherwise, the terminal device reports the measurement result of the CQI to the first network device.

Optionally, the first indication information is carried in padding bits in the channel state information.

Specifically, the first indication request information is distinguished from CSI by padding bits (padding bits).

Optionally, the padding bits are all 1, which indicates that the terminal device sends the first indication information or indicates that the content carried on the first uplink resource includes the first indication information; the padding bits are all 0 or the padding bits are not all 1, which indicates that the terminal device does not send the first indication information or indicates that CSI is carried on the first uplink resource.

Optionally, the padding bits are all 0, which indicates that the terminal device sends the first indication information or indicates that the content carried on the first uplink resource includes the first indication information; the padding bits are all 1 or the padding bits are not all 0, which indicates that the terminal device does not send the first indication information or indicates that CSI is carried on the first uplink resource.

It should be understood that the CSI reporting includes RI, CQI, PMI, etc. The number of bits of CQI and PMI varies with the RI value. In order to reduce the complexity of blind detection, the prior art takes a fixed bit number when reporting the CSI, and if the bit number is insufficient, 0 is complemented on the redundant state bit to achieve the fixed bit number.

In this embodiment of the present application, after determining that the communication on the first downlink resource fails, the terminal device may supplement 1 to the reported redundancy status bits, supplement 0 to the reported redundancy status bits, or supplement according to other preset rules.

According to the communication failure recovery method, the terminal equipment sends the first indication information through multiplexing or punching the filling bits used for transmitting the channel state information, and resource expenditure of the network equipment is saved.

Optionally, the first indication information is carried in a non-zero wideband amplitude coefficient field in the channel state information.

Specifically, the first indication information is distinguished from the CSI by a non-zero wideband amplitude coefficient (non-zero wideband amplitude coefficients) field indicating the most significant bit or the least significant bit.

It should be understood that the non-zero wideband magnitude is the content of the type II CSI feedback to indicate the non-zero number of linear combined magnitude coefficients of the PMI codebook.

For type II CSI feedback (high precision codebook), non-zero wideband amplitude coefficients will be reported. When the number of beams for linear combining is 2, there are 4 non-zero wideband amplitudes per layer, where the first amplitude is normalized and a value of 1 does not need to be reported, so the number of optional non-zero amplitudes (decimal) is {0,1,2}, the number of bits is 2 bits, and then there is a state (binary 00 or 11) indicating a link failure recovery request.

For example, when the terminal device determines that communication on the first downlink resource fails, the reported non-zero wideband amplitude is a digital domain of 00. Otherwise, the reported non-zero broadband amplitude is in the digital domain of 01-11.

For another example, when the terminal device determines that communication on the first downlink resource fails, the reported non-zero wideband amplitude is a digital domain of 11. Otherwise, the reported non-zero broadband amplitude is in the digital domain of 00-10.

It should be understood that the non-zero wideband amplitude system in the embodiments of the present application may also be transmitted by other numbers of bits, and this is not a limitation of the present application.

Optionally, the method further comprises:

the terminal equipment sends second indication information to the first network equipment on the first uplink resource, and the first network equipment receives the second indication information sent by the terminal equipment on the first uplink resource, wherein the second indication information comprises one or more of identification information of the second cell, information of a first reference signal with channel quality being greater than or equal to a first preset threshold, or information of a second reference signal with channel quality being less than or equal to a second preset threshold.

Optionally, the first reference signal and the second reference signal are reference signals on the second cell.

Optionally, the first reference signal is a reference signal newly identified on a downlink (a link between the terminal device and the second network device), and the information of the first reference signal includes a resource index of the first reference signal and/or quality information of the first reference signal.

It is to be appreciated that the first reference signal may correspond to new identified beam in method 300.

It should also be appreciated that the first reference signal may be used by the second network device to recover the downlink (the link between the second network device and the terminal device).

It is also understood that the downlink may also be understood as the link of the terminal device with the second network device in the second cell.

Optionally, the second reference signal is a reference signal for detecting failure of a downlink (link between the terminal device and the second network device), or the second reference signal is a reference signal corresponding to or included in a spatial correlation parameter associated with the first downlink resource, and the information of the second reference signal includes a resource index of the second reference signal and/or quality information of the second reference signal.

It is to be appreciated that the second reference signal may correspond to one or more reference signals in beam failure detection RS set of the method 300.

It should also be appreciated that, optionally, the first reference signal and the second reference signal are reference signals of the second cell.

It should also be appreciated that the first reference signal and the second reference signal may be downlink reference signals.

For example, the first reference signal and the second reference signal are CSI RS, SSB, DMRS or TRS, etc.

In this embodiment, "a belongs to the xth cell" may be understood as "a is a reference signal or resource of the xth cell".

Optionally, the second indication information is carried in a status bit of the CSI.

Further optionally, the second indication information is carried in a field corresponding to the lowest priority content of the CSI.

Optionally, the content with the lowest priority is the content with the highest priority or the lowest transmission priority when the bit number of the CSI reported by the terminal equipment exceeds the maximum resource allocation.

Optionally, the content with the lowest priority is part 2 of CSI feedback, or the content with the lowest priority is the content of the last subband of CSI feedback or part 2 of the last subband.

Optionally, the lowest priority content corresponds to the content with the smallest or largest CSI report ID.

For example, table 4 shows the content of part 2 of a CSI feedback, ordered by priority.

Table 4 prioritized content in part 2 of CSI feedback

It should be understood that N _Rep The number of CSI reports in a time unit corresponds to the number of associated reportconfigids.

It should also be appreciated that for Type I CSI feedback, where part 1 includes the CQI for the RI (if reported), CRI (if reported) first codeword, part 2 includes the PMI and the CQI for the second codeword (when RI > 4).

For Type II CSI feedback, where part 1 has a fixed payload (playload size) and includes RI, CQI, and indication information of the number of non-zero wideband amplitude coefficients for each layer of Type II CSI (an indication of the number of non-zero wideband amplitude coefficients per layer for the Type II CSI), part 2 includes PMI information of Type II CSI, and part 1 and part 2 are independently encoded, respectively.

It should also be appreciated that the priorities in Table 4 range from 0 to 2N _Rep It may be understood that the drop priority is from low to high or that the transmission priority is from high to low.

It should also be appreciated that the second indication information may be carried in a field corresponding to the lowest priority content of the CSI, and may also be carried in a field corresponding to the lower priority content of the CSI.

Optionally, the method further comprises: the terminal equipment sorts the word fields corresponding to the priority contents in the CSI according to a predefined rule, and determines the word field corresponding to the first priority content; the terminal device loads one or more of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal in a word field corresponding to the first priority content.

Optionally, the method further comprises: the terminal equipment determines the word domain corresponding to the first priority content from the word domain corresponding to the first priority content and the word domain corresponding to the second priority content in the CSI according to a predefined rule; the terminal device loads one or more of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal in a word field corresponding to the first priority content.

Optionally, at least part of the second indication information is carried in the first indication information.

It should be understood that at least part of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal is carried on the first indication information, and that the terminal device may simultaneously transmit at least part of the identification information of the second cell, the information of the first reference signal and the information of the second reference signal and the first indication information to the first network device.

Optionally, the second indication information and the first indication information are carried in different status bits in the CSI.

It should be understood that the terminal device may also send the first indication information and the second indication information to the first network device at different times.

It should be understood that the second indication information is carried in the field corresponding to the low priority content of the CSI and may be further understood as multiplexing or puncturing the lower state bits of the CSI, which may reduce the impact on CSI reporting.

It should be appreciated that the method 400 may use the non-competing PRACH resources and/or competing PRACH resources on the active BWP when not configured to recover the link.

In addition, when the auxiliary cell is not configured with uplink resources, the auxiliary cell can be timely and effectively assisted by the main cell, so that the link failure recovery of the auxiliary cell is realized.

The process of transmitting the first indication information by multiplexing or puncturing the status bits of the CSI is described in detail above with reference to fig. 4, and the method 500 for recovering from communication failure according to the embodiment of the present application is described below with reference to fig. 5.

The method 500 for recovering communication failure in the embodiment of the present application may be applied in a multi-carrier aggregation scenario, where a primary cell may assist a secondary cell in recovering communication failure, where the primary cell and the secondary cell need to perform information interaction, and in an ideal backhaul scenario, although the interaction time delay is shorter, the interaction time delay may not be fixed; in the non-ideal backhaul scenario, the interaction time delay is longer, the response information time for receiving the communication failure request sent by the primary cell in the secondary cell is difficult to predict, the terminal device does not know when to receive the communication failure response information sent by the second network device, if the starting time for receiving the communication failure response information by the terminal device is too early, the power consumption of the terminal device may be too high, or the communication failure response information cannot be received within a limited time (time window) to initiate the communication failure recovery request again, the link cannot be recovered quickly, and even the link cannot be recovered.

Fig. 5 shows a schematic flow chart of a method 500 of communication failure recovery according to an embodiment of the present application, as shown in fig. 5, the method 500 includes:

s510, the terminal equipment sends first indication information to the first network equipment on the second uplink resource, and the first network equipment receives the first indication information sent by the terminal equipment on the second uplink resource, wherein the first indication information is used for indicating that the communication of the terminal equipment on the first downlink resource fails;

s520, the terminal equipment detects communication failure response information in an nth time unit after the first indication information is sent and/or in a time window when the mth time unit is used for sending the time-frequency resource position of the downlink control channel;

wherein n is an integer greater than or equal to 0, m is an integer greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or,

the spatial correlation parameter associated with the second uplink resource is different from the spatial correlation parameter associated with the second downlink resource.

It should be understood that, in the embodiment of the present application, the terminal device detecting the communication failure response information may also be understood that the terminal device receives the communication failure response information.

It should also be understood that in the embodiment of the present application, the third cell may be a Pcell, a PScell, an SPcell, or a Scell, and the fourth cell may be a Scell; alternatively, the third cell may be a Scell, and the fourth cell may be a Pcell, a PScell, an SPcell, or a Scell.

Alternatively, the time-frequency resource location may be a time-frequency resource location of the fourth cell for transmitting a downlink control channel.

Optionally, the terminal device receives the communication failure response information sent by the second network device.

Optionally, when the third cell belongs to the first network device and the fourth cell belongs to the second network device, the terminal device receives the communication failure response information sent by the second network device in the fourth cell.

Optionally, the first network device and the second network device are the same network device, or the first network device and the second network device are different network devices.

Optionally, the first downlink resource and the second downlink resource both belong to the fourth cell.

It should be appreciated that the first indication information may also be link failure recovery request (beam failure recovery request, BFRQ) information for requesting recovery of a link failure between the terminal device and the second network device.

It should also be appreciated that the communication failure response information may be link failure recovery response (beam failure recovery response, BFRR) information, which is a response to the BFRQ information sent by the second network device.

It should also be understood that the time unit in the embodiments of the present application may be one or more radio frames defined in the LTE or 5G NR system, one or more subframes, one or more slots, one or more minislots (mini slots), one or more orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols, or a time window formed by a plurality of frames or subframes, for example, a system information (system information, SI) window.

Optionally, the terminal device receives the communication failure response information on the fourth cell.

Optionally, the terminal device receives the communication failure response information on a first time-frequency resource.

For example, when n=0, the terminal device may receive the communication failure response information within a time window in which a current slot (or a current subframe, etc.) in which the first indication information is transmitted starts.

For another example, when n=4, the terminal device may receive the communication failure response information within a time window starting 4 slots (or subframes, etc.) after transmitting the first indication information.

For another example, m=1, the terminal device may receive the communication failure response information within a time window from a time-frequency resource location of the first downlink control channel after the first indication information is sent.

Optionally, the terminal device receives communication failure response information, including: and the terminal equipment receives the communication failure response information sent by the second network equipment on the appointed downlink resource.

Optionally, the terminal device receives communication failure response information, including: and the terminal equipment receives the communication failure response information of the second network equipment on the fourth cell on the appointed downlink resource.

It should be understood that the first network device may be the same network device as the second network device, and the network devices in which the third cell and the fourth cell are located are both the first network device; or the first network device and the second network device are different network devices, the network device where the third cell is located is the first network device, and the network device where the fourth cell is located is the second network device.

Optionally, the terminal device sends the first indication information to the first network device on a second uplink resource.

It should be understood that the second uplink resource may be different from the first uplink resource in the method 400, or may be the same as the first uplink resource, which is not limited in any way in the embodiment of the present application.

Optionally, the second downlink resource is a physical downlink control channel PDCCH resource.

Optionally, the second uplink resource is a physical random access channel PRACH resource.

Optionally, the second uplink resource is a resource for transmitting channel state information CSI between the first network device and the terminal device.

Optionally, the second uplink resource is a physical uplink control channel PUCCH resource or a physical uplink shared channel PUSCH resource.

It should be appreciated that, in some status bits of the CSI may be multiplexed or punctured with the first indication information, the specific multiplexing or puncturing method may refer to the method 400 described above, which is not repeated herein for brevity.

Optionally, the method 500 further includes:

the terminal equipment determines the n or the m according to the system parameters of the third cell and/or the fourth cell.

Optionally, the system parameters (numerology) include subcarrier spacing (subcarrier spacing, SCS) and/or Cyclic Prefix (CP).

It should be appreciated that in the embodiment of the present application, optionally, the length of one time unit is determined by the subcarrier spacing and the cyclic prefix together.

Optionally, the terminal device determines the n or the m according to the subcarrier spacing of the third cell and/or the fourth cell.

Alternatively, the subcarrier spacing of the third cell and/or the fourth cell may be 15khz,30khz,60khz,120khz,240khz.

Optionally, the subcarrier spacing of the third cell is a subcarrier spacing of an uplink carrier or a subcarrier spacing of a downlink carrier.

Optionally, the subcarrier spacing of the fourth cell is a subcarrier spacing of a downlink carrier.

Optionally, the terminal device determines the n or the m according to a subcarrier spacing of the third cell.

For example, the subcarrier spacing of the third cell is 60KHz, and then the length of n time units therein may be 4 slots (slots) of the third cell downstream.

For another example, the subcarrier spacing of the third cell is 120KHz, and then the length of n time units may also be 8 slots (slots) of the third cell.

Optionally, the terminal device determines the n or the m according to a subcarrier spacing of the fourth cell.

For example, the subcarrier spacing of the fourth cell is 60KHz, and then the length of n time units therein may be 4 slots (slots) of the fourth cell.

For another example, the subcarrier spacing of the fourth cell is 120KHz, and then the length of n time units may also be 8 slots (slots) of the fourth cell.

Optionally, the terminal device determines the n or the m according to subcarrier spacing of the third cell and the fourth cell.

Optionally, the terminal device determines the n or m according to a minimum value of subcarrier spacing of the third cell and the fourth cell. For example, the subcarrier spacing of the third cell is 60KHz, the subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is a time unit when the subcarrier spacing is 60 KHz. Optionally, the terminal device determines the n or m according to a maximum value of subcarrier spacing of the third cell and the fourth cell. For example, the subcarrier spacing of the third cell is 60KHz, the subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is a time unit when the subcarrier spacing is 120 KHz.

Optionally, the terminal device may determine n or m according to a minimum value of a subcarrier spacing of an uplink carrier of the third cell and a downlink subcarrier spacing of the fourth cell; for example, the uplink subcarrier spacing of the third cell is 60KHz, the downlink subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 60 KHz. Optionally, the terminal device may determine n or m according to a maximum value of a subcarrier spacing of an uplink carrier of the third cell and a downlink subcarrier spacing of the fourth cell; for example, the uplink subcarrier spacing of the third cell is 60KHz, the downlink subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 120 KHz.

Optionally, the terminal device may determine n or m according to a minimum value of a subcarrier spacing of a downlink carrier of the third cell and a downlink subcarrier spacing of the fourth cell; for example, the downlink subcarrier spacing of the third cell is 60KHz, the downlink subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 60 KHz. Optionally, the terminal device may determine n or m according to a maximum value of a subcarrier spacing of a downlink carrier of the third cell and a downlink subcarrier spacing of the fourth cell; for example, the downlink subcarrier spacing of the third cell is 60KHz, the downlink subcarrier spacing of the fourth cell is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 120 KHz.

Optionally, the terminal device may determine n or m according to a minimum value of a subcarrier interval of the first uplink resource and a subcarrier interval of the second downlink resource; for example, the subcarrier spacing of the first uplink resource is 60KHz, the subcarrier spacing of the second downlink resource is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 60 KHz. Optionally, the terminal device may determine n or m according to a maximum value of a subcarrier interval of the first uplink resource and a subcarrier interval of the second downlink resource; for example, the subcarrier spacing of the first uplink resource is 60KHz, the subcarrier spacing of the second downlink resource is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 120 KHz. Here, the first uplink resource may be a resource on an uplink carrier of the third cell, and the second downlink resource may be a resource on a downlink carrier of the fourth cell.

Optionally, the terminal device may determine n or m according to a minimum value of the subcarrier spacing of the second uplink resource and the subcarrier spacing of the second downlink resource; for example, the subcarrier spacing of the second uplink resource is 60KHz, and the subcarrier spacing of the second downlink resource is 120KHz, n determined by the terminal device is n time units when the subcarrier spacing is 60 KHz. Optionally, the terminal device may determine n or m according to a maximum value of the subcarrier spacing of the second uplink resource and the subcarrier spacing of the second downlink resource; for example, the subcarrier spacing of the first uplink resource is 60KHz, the subcarrier spacing of the second downlink resource is 120KHz, and n determined by the terminal device is n time units when the subcarrier spacing is 120 KHz. Here, the second uplink resource may be a resource on an uplink carrier of the third cell, and the second downlink resource may be a resource on a downlink carrier of the fourth cell. It should be understood that n is a positive integer, and optionally n is predefined, or configured by the base station, or reported by the terminal capability.

It should be noted that, in the embodiment of the present application, the determined n and/or m may be a value corresponding to the subcarrier spacing.

In one embodiment, the terminal device determines the n or the m according to a detection time of a communication failure recovery response of the third cell, subcarrier spacing offsets of the third cell and the fourth cell. Or the terminal equipment determines the n or the m according to the detection time of the communication failure recovery response of the third cell, the subcarrier spacing of the third cell and the subcarrier spacing of the fourth cell.

For example, the subcarrier spacing of the downlink carrier of the third cell is XKHz, the subcarrier spacing of the downlink carrier of the fourth cell is YKHz, when the communication failure of the third cell is recovered on the third cell, the terminal device detects the communication failure recovery response information on the third cell after W time units of sending the communication failure recovery request information, and when the communication failure recovery is performed by the fourth cell assisted by the third cell, the start time of the terminal device detecting the communication failure recovery response information of the fourth cell is determined by X, Y and W.

Alternatively, n= (y×w)/X, or n is greater than (y×w)/X, orOr->Or->Or->Or->

For example, X is 60KHz, Y is 120KHz, W is 2, and n is 4.

For another example, X is 120KHz, Y is 60KHz, W is 2, and n is 1.

It should be understood that in the embodiment of the present application, the terminal device may also determine n or m by using a predefined formula in the protocol.

Optionally, the first network device sends the communication failure response information to the terminal device in an xth time unit after receiving the first indication information and/or a time window in which a time-frequency resource for sending downlink control information starts.

For example, the third cell and the fourth cell both belong to the first network device, and after the first network device receives the first indication information, x=n-k may be determined by determining the n by a time delay k between the first network device and the terminal device, where the subcarrier spacing of the third cell and/or the fourth cell determines the n. Optionally, the time delay between the first network device and the terminal device includes a time delay from the first network device to the terminal device and/or a time delay from the terminal device to the first network device to the terminal device, and in an embodiment, the time window may also be a preset time window.

Optionally, the method further comprises:

the terminal equipment sends second indication information to the first network equipment on the second uplink resource, and the first network equipment receives the second indication information sent by the first network equipment on the second uplink resource, wherein the second indication information comprises one or more of identification information of the fourth cell, information of a first reference signal with channel quality being greater than or equal to a first preset threshold, or information of a second reference signal with channel quality being less than or equal to a second preset threshold.

It is also understood that the downlink may also be understood as a link between the terminal device and the second network device at the fourth cell.

Optionally, the method 500 further includes:

the first network device transmits information of a first reference signal.

It should be understood that, when the network devices in which the third cell and the fourth cell are located are the same network device (the first network device), the first network device does not need to send the information of the first reference signal, and the first network device may perform the interaction of the information of the first reference signal internally.

Optionally, the network devices of the third cell and the fourth cell are different network devices, for example, the network device of the third cell is the first network device, the network device of the fourth cell is the second network device, and the first network device sends the information of the first reference signal, including: the first network device transmits information of the first reference signal to the second network device.

Optionally, the network devices in which the third cell and the fourth cell are located are different network devices, for example, the network device in which the third cell is located is the first network device, and the network device in which the fourth cell is located is the second network device, where after receiving the information of the first reference signal sent by the first network device, the second network device determines the x according to the time delay between the second network device and the terminal device.

For example, the second network device determines a delay between the second network device and the terminal device, and/or a delay between the first network device and the second network device, and/or a delay between the first network device and the terminal device is k, and the second network device determines the n by a subcarrier spacing of the fourth cell, where x=n-k.

Optionally, the terminal device receives communication failure response information, including: and the terminal equipment receives the communication failure response information sent by the first network equipment on the appointed downlink resource.

Specifically, after receiving the information of the first reference signal, the second network device may also send the communication failure response information to the first network device, and forward the communication failure response information to the terminal device through the first network device.

Optionally, the second network device may directly send the communication failure response information to the terminal device after receiving the information of the first reference signal.

Optionally, the method 500 further includes:

the first network device sends third indication information to the terminal device, the terminal device receives the third indication information sent by the first network device, the third indication information is used for indicating the terminal device to receive the communication failure response information, and the third indication information is borne on a third downlink resource;

The terminal equipment determines the n or the m according to the third indication information;

wherein the third downlink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells; or,

the spatial correlation parameter associated with the third downlink resource is different from the spatial correlation parameter associated with the second downlink resource.

Optionally, the first downlink resource and the second downlink resource belong to the same cell.

Optionally, the third downlink resource and the second uplink resource belong to the same cell.

Optionally, the first network device sends the third indication information to the terminal device according to one or more of a delay between the first network device and the second network device, a delay between the first network device and the terminal device, a delay between the second network device and the terminal device, a subcarrier spacing of the third cell, or a subcarrier spacing of the fourth cell.

For example, when the first network device and the second network device are different network devices, the first network device may determine a first delay (for example, 5 ms) between the first network device and the second network device, and then the first network device may send the third indication information to the terminal device after sending the information of the first reference signal through the first delay, so that the terminal device may determine the n or the m after receiving the third indication information, and the second network device may learn a second delay between the second network device and the terminal device, and may ensure that the terminal device receives the communication failure response information sent by the second network device in an nth time unit after sending the first indication information, and/or in an mth time window for starting to send a time-frequency resource of a downlink control channel. It should be understood that in this application, a time delay is understood as a time interval from the transmission of one device to the reception of another device.

Optionally, the terminal device receives the third indication information sent by the first network device on the second time-frequency resource.

Optionally, the first time-frequency domain resource and the second time-frequency domain resource are different time-frequency domain resources, or the first time-frequency domain resource and the second time-frequency domain resource are determined by different sets of control resources and/or search space.

Optionally, the second time-frequency resource is determined by a set of control resources and/or a set of search spaces.

Optionally, the third indication information includes one or more of information indicating a start time of receiving the communication failure response information, identification information of the fourth cell, identification information of a control resource set for receiving the communication failure response information, or identification information of a search space set for receiving the communication failure response information.

Optionally, the time window for the terminal device to receive the communication failure response information is configured to the terminal device by the network device through higher layer signaling (e.g., RRC signaling).

In some possible implementations, the starting time of the terminal device to receive the communication failure response information is determined by the first network device. Optionally, the method further comprises:

The terminal equipment receives the communication failure response information in a time window from an a-th time unit after receiving the third indication information, wherein a is an integer greater than or equal to 0; or,

and the terminal equipment receives the communication failure response information in a time window from the time frequency resource position of the b-th time frequency resource for sending the downlink control channel after receiving the third indication information, wherein b is an integer greater than or equal to 0.

For example, the terminal device may receive the communication failure response information within a time window starting from a time unit after receiving the third indication information, when the terminal device has elapsed c time units from the transmission of the first indication information to the reception of the third indication information, where c=n-a.

For another example, the a or b may be predefined by a protocol, and after the terminal device receives the third indication information, the communication failure response information is received according to the predefined content of the protocol.

Optionally, the terminal device receives the communication failure response information on a second time-frequency resource.

For example, when the a=0, the terminal device may receive the communication failure response information within a time window in which a current slot (or a current subframe, etc.) in which the third indication information is received starts.

For another example, when a=4, the terminal device may receive the communication failure response information within a time window starting 4 slots (or subframes, etc.) after receiving the third indication information.

For another example, b=1, the terminal device may receive the communication failure response information within a time window from a time-frequency resource location of the first downlink control channel after receiving the third indication information.

Optionally, in this embodiment of the present application, if the terminal device does not receive the communication failure response information within the time window, the first indication information may be sent again to the first network device, that is, the communication failure recovery request may be reinitiated, where a different beam may be used with the last time the communication failure recovery request was sent, or where the same beam may be used with the last time the communication failure recovery request is sent, and the terminal device may correspondingly increase the transmit power.

Optionally, if the terminal device receives the first indication information within the time window, the terminal device further continues to detect (or receive) the first time-frequency resource or the PDCCH carried on the first time-frequency resource. Wherein, optionally, the terminal device uses the beam detection or reception PDCCH of the reference signal with the channel quality greater than or equal to the first threshold value or the beam detection or reception PDCCH of the downlink reference signal associated with the first indication information. Namely, the terminal equipment detects or receives the PDCCH by adopting the space-related parameters of the reference signal with the channel quality being larger than or equal to a first threshold value or the downlink reference signal associated with the first indication information.

It should be understood that, in the embodiment of the present application, the order of sending the third indication information and the information of sending the first reference signal by the first network device is not limited in any way.

It should also be understood that, in this embodiment of the present application, after receiving the first indication information sent by the terminal device, the first network device may send other information to the second network device in addition to the information of the first reference signal to the second network device, for example, the first network device may forward the first indication information to the second network device.

Optionally, the third indication information is carried in one or more of downlink control information DCI, a medium access control layer control element MACCE, or radio resource control RRC signaling.

Optionally, the first network device sends the DCI to the terminal device on a set of control resources dedicated to sending communication failure response information and/or a set of search spaces dedicated to sending communication failure response information; or the first network device transmits the MAC CE, RRC on PDSCH resources scheduled by PDCCH carried on the control resource set dedicated to transmitting the communication failure response information and/or the search space set dedicated to transmitting the communication failure response information. Optionally, the set of control resources and/or the set of search spaces and/or the PDSCH are resources of a fourth cell configured for the first network device.

Optionally, the DCI includes a first field, where the first field is used to instruct the terminal device to receive the link failure recovery response information.

Specifically, there may be the following ways:

mode one

The DCI format is a first format, and the DCI is a signaling dedicated to instructing the terminal device to receive link failure recovery response information.

Mode two

The DCI format is a second format, where the DCI of the second format is used for uplink data transmission or downlink data transmission. The information in the first field is used only for signaling to instruct the UE to detect link failure recovery response information.

It is understood that the second format may be a format of DCI in NR, for example, 1-0,1-1, etc.

Mode three

The DCI format is a second format, where the DCI of the second format is used for uplink data transmission or downlink data transmission, and the first field is carried in a time-frequency resource indicator field in the DCI.

Optionally, the time domain resource indicator and/or the frequency domain resource indicator field are all 0 to indicate the terminal device to receive the communication failure response information from the second network device.

In this embodiment of the present application, since the subcarrier spacing of the primary cell and/or the secondary cell, or the interaction or processing delay between the inside/between network devices, and or the terminal capability information (such as cell switching delay) reported by the terminal are known, the first network device may send indication information to the terminal, so as to inform the terminal device of the starting time of receiving the communication failure response information.

The link failure recovery method in the embodiment of the invention is beneficial to ensuring that the terminal equipment receives the link failure recovery response information more accurately and efficiently by sending the indication information to the terminal equipment, recovering the link rapidly, ensuring the stability of the system and saving the power consumption of the terminal equipment.

The terminal device sends the link failure request information in the p-th time unit, and detects the link failure recovery response information in the q-th time unit. However, since the subcarrier spacing (or system parameter) of the uplink carrier and the downlink carrier of the cell are different, the terminal device is not aware of which subcarrier spacing (or system parameter) the p-th time unit is the time unit in, and is not aware of which subcarrier spacing (or system parameter) the q-th time unit is the time unit in. In the existing system, the absolute time of time units is different under different subcarrier intervals. In view of this, a method of communication failure recovery is described below.

The terminal equipment sends first indication information to the network equipment in a p-th time unit on a second uplink resource, wherein the first indication information is used for indicating communication failure of the terminal equipment on a first downlink resource;

wherein p is an integer greater than or equal to 0, q is an integer greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or,

The spatial correlation parameter associated with the second uplink resource and the spatial correlation parameter associated with the second downlink resource;

and the terminal equipment determines the p and/or q according to the system parameters of the third cell and/or the fourth cell.

Optionally, the q time unit is a q time unit of a downlink of the fourth cell.

In some possible implementations, the determining, by the terminal device, the p according to the system parameters of the third cell and/or the fourth cell includes:

the terminal equipment determines the p according to the system parameters of the uplink carrier wave of the third cell; or alternatively

The terminal equipment determines the p according to the system parameters of the second uplink resource; or alternatively

The terminal equipment determines the p according to the system parameters of the third uplink resource of the third cell;

and the terminal equipment determines the p according to the system parameters of the uplink resource with the minimum system parameters of all the uplink resources of the third cell.

For example, the third uplink resource is SRS and/or PUCCH and/or PUSCH and/or PRACH and/or CSI-RS, etc.

For example, all uplink resources of the third cell are SRS and/or PUCCH and/or PUSCH and/or PRACH and/or CSI-RS, etc.

In some possible implementations, the determining, by the terminal device, the q according to the system parameters of the third cell and/or the fourth cell includes:

the terminal equipment determines q according to the system parameters of the uplink carrier wave of the third cell and the system parameters of the downlink carrier wave of the fourth cell; or alternatively

The terminal equipment determines q according to the system parameters of the second uplink resource and the system parameters of the second downlink resource; or alternatively

The terminal equipment determines q according to the system parameters of the third uplink resource of the third cell and the system parameters of the third downlink resource of the fourth cell; or alternatively

The terminal equipment determines the q according to the system parameters of the uplink carrier of the third cell, the system parameters of the downlink carrier of the fourth cell and the p; or alternatively

The terminal equipment determines the q according to the system parameters of the second uplink resource, the system parameters of the second downlink resource and the p; or alternatively

And the terminal equipment determines the q according to the system parameters of the third uplink resource of the third cell, the system parameters of the third downlink resource of the fourth cell and the p.

For example, the third uplink resource may be SRS and/or PUCCH, etc.

In some possible implementations, q may be determined by any one of the following formulas:

alternatively, q is determined by any one of the following formulas:

/>

wherein,for the lower rounding operation, ++>Is an upper rounding operation. Optionally, q is the number of time units determined by which system parameter, and K1 are the number of time units determined by which system parameter. For example, q is the number of time units of the downlink subcarrier of the fourth cell, and K, K1 is the number of time units of the downlink subcarrier of the fourth cell. Wherein Z may be sent by the network device or predefined or reported by the terminal capability, and Z may represent a duration, such as a duration of several milliseconds. And K or Z is a positive integer.

Optionally, μ1 is a system parameter of an uplink carrier of the third cell, and μ2 is a system parameter of a downlink carrier of the fourth cell; or, μ1 is a system parameter of the second uplink resource, and μ2 is a system parameter of the second downlink resource of the fourth cell; alternatively, μ1 is a system parameter of a third uplink resource of the third cell, and μ2 is a system parameter of a third downlink resource of the fourth cell; and K or Z is a positive integer.

Optionally, the K is predefined or reported by the terminal device capability or indicated by the network device (as indicated by the third indication information).

Optionally, the Z is predefined or reported by the terminal device capability or indicated by the network device (as indicated by the third indication information), and optionally, the z=1.

And the K is determined based on the system parameter of the downlink carrier of the fourth cell or the system parameter of the second downlink resource of the fourth cell or the system parameter of the third downlink resource of the fourth cell.

Optionally, N is the number of slots in one subframe, and N is a positive integer.

In some implementations, the terminal device receives third indication information; and the terminal equipment determines the K according to the third indication information.

Table 5: number of OFDM symbols contained in each slot of normal cyclic prefixNumber of slots per frameThe number of slots per subframe +.>

TABLE 5

Table 6: the number of OFDM symbols contained in each slot of the forward extended cyclic prefixThe number of slots per frame +.>The number of slots per subframe +.>

TABLE 6

Where μ is an identification of a system parameter, and the value of μ is related to the subcarrier spacing, as shown in table 7 below.

TABLE 7

The unit lengths of the uplink and downlink slots may be different. Taking PDCCH as an example, since the subcarrier spacing (Subcarrier spacing, SCS) of the uplink and downlink transmissions may be different, for example, an SCS of 15kHz is used for uplink transmission, a length of one uplink time slot is 1 ms, an SCS of 120kHz is used for downlink transmission, and a length of one downlink time slot is 0.125 ms. As can be seen from table 3, the SCS with 15kHz for uplink transmission, i.e. Δf is 15kHz, the corresponding system parameter μ is 0, the SCS with 120kHz for downlink transmission, i.e. Δf is 120kHz, the corresponding system parameter μ is 3, so that the corresponding system parameters for uplink and downlink transmissions are different, the unit lengths of the uplink time slot and the downlink time slot are also different, and there are different understandings about the time when the network device and the terminal send the link failure recovery request information (the p-th time unit) and the time when the link failure recovery response information (the q-th time unit) is detected.

Optionally, for convenience of description, the time when the terminal device sends the first indication information is a first time, the time when the terminal device detects or starts to detect the link failure recovery response information or the starting time of a time window for detecting the link failure recovery response information is a second time, and the second time is after the first preset time passes at the first time. The explanation of μ1 and μ2 is the same as above, and will not be repeated in this embodiment. Optionally, in this embodiment, the time unit is a slot (slot), and other unit types may be used as described above, which is not limited in this embodiment. Specifically, the following modes are adopted:

the first way is:

the terminal determines the second time according to the uplink carrier component (component carrier, CC) or the uplink partial Bandwidth (BWP) or the uplink frame of the third cell, or the second uplink resource of the third cell, or the system parameter of the third uplink resource of the third cell.

Specifically, the first time is an uplink time slot (p) in which the terminal sends first indication information to the network device, the terminal starts a timer in the uplink time slot (p), and the first preset duration is the length of the timer, which is Z ms, specifically may be 4 ms; or K uplink time slots, wherein K is a positive integer; for example, according to table 7, when the subcarrier spacing of one uplink timeslot is 15kHz and the length thereof is 1 ms, the length of the timer, i.e., the first preset duration, may be 4 uplink timeslots.

Or, let the moment of using the detected link failure recovery response information be:wherein slot (p) represents an uplink time slot (p), which is the first time instant; />And N is the number of time slots in one subframe for the first preset duration. For example, a first preset time period +.>Equal to 4 milliseconds; or according to tables 5 and 7, when the number of slots in one subframe is 1 when the subcarrier spacing of one uplink slot is 15kHz, the first preset duration +.>And the second time (such as detecting link failure recovery response information) is obtained after the first preset time length is up to 4 uplink time slots, namely, after 4 milliseconds or 4 uplink time slots.

Accordingly, the network device determines the first time and the second time in the same manner.

The second way is: the first moment, that is, the p-th time slot is an uplink time slot (p) or a downlink time slot (w) corresponding to the uplink time slot (p), and the terminal determines the second moment according to the system parameter configuration of the downlink CC or the downlink BWP or the downlink frame of the fourth cell or the second downlink resource of the fourth cell or the third downlink resource of the fourth cell.

Specifically, the first time is a downlink time slot (w) corresponding to an uplink time slot (p) in which the terminal sends first indication information to the network device, the terminal starts a timer in the downlink time slot (w), and the first preset duration is the length of the timer, which is Z ms, specifically may be 4 ms; or K downlink time slots, wherein K is a positive integer; for example, according to table 7, when the subcarrier spacing of one uplink timeslot is 120kHz and the length of one downlink timeslot is 0.125 ms, the length of the timer, that is, the first preset duration may be 32 downlink timeslots.

The method for converting the uplink time slot into the downlink time slot can be as followsWherein->The whole symbol is rounded down.

Or, let the second moment of the terminal be:wherein->And representing a downlink time slot (w) as the first time, wherein the slot (p) is an uplink time slot (p) in which the terminal sends first indication information to the network equipment.

And N is the number of time slots in one subframe for the first preset duration. For example, a first preset time period +.>Equal to 4 ms, or according to tables 5 and 7, when the subcarrier spacing of one uplink time slot is 120kHz and the number of time slots in one subframe is 8, a first preset duration +.>32 downlink timeslots, and thus, after the first preset duration is reached, i.e., after 4 ms or 32 downlink timeslots, is the second time (e.g., the link failure recovery response information starts to be detected).

Third mode: the terminal compares the uplink and downlink system parameters and determines one of the parameters as the basis of the unified time. For example, the terminal compares the system parameters μ of the carrier component or the bandwidth portion or the uplink and downlink frames, and uses the system parameters corresponding to the smaller subcarrier interval of the uplink subcarrier interval and the downlink subcarrier interval as the range of the time measurement, as the basis for determining the first time and the first preset duration, that is, determining the second time.

Specifically, the terminal starts a timer in a time slot p for sending the first indication information to the network device, where the time slot p is a time slot (p) corresponding to a carrier component or a bandwidth part corresponding to a smaller subcarrier interval in the uplink subcarrier interval and the downlink subcarrier interval or a system parameter μ of the uplink and downlink frames, and may be, for example, an uplink time slot (p) or a downlink time slot (p).

Alternatively, let the second time be:where μ is the smaller of μ1 and μ2. As shown in table 7, if the subcarrier spacing corresponding to the uplink carrier component or the uplink bandwidth portion or the uplink frame is 15kHz, the corresponding μ1 is 0, if the subcarrier spacing corresponding to the downlink carrier component or the downlink bandwidth portion or the downlink frame is 120kHz, the corresponding μ2 is 3, and the following is used>When determining the moment of detecting the link failure recovery response information by the terminal, mu is smaller value mu 1 in mu 1 and mu 2, and slot (p) is also the uplink time slot (p) corresponding to mu 1.

It should be understood that the above-described determination of the time for detecting the communication failure response information for the terminal device may specifically determine p and q according to the above manner. The time when the network device determines to transmit the communication failure response information is similar to that of the terminal device, and the time when the first indication information is received and the time when the communication failure response information is determined may also be determined according to the above manner, which is not illustrated in detail herein.

The method for recovering communication failure provided in the embodiment of the present application is described in detail above with reference to fig. 1 to 5, and the apparatus, the terminal device, and the network device for recovering communication failure provided in the embodiment of the present application are described in detail below with reference to fig. 6 to 10.

Fig. 6 shows a schematic block diagram of an apparatus 600 for communication failure recovery provided in this embodiment of the present application, where the apparatus 600 may correspond to a terminal device described in the foregoing method 400, or may correspond to a chip or a component of the terminal device, and each module or unit in the apparatus 600 may be used to perform each action or process performed by the terminal device in the foregoing method 400, respectively, and as shown in fig. 6, the apparatus 600 for communication failure recovery may include a processing unit 610 and a transceiver unit 620.

Specifically, the processing unit 610 is configured to determine that communication on the first downlink resource fails;

a transceiver unit 620, configured to send, on the first uplink resource, first indication information to a network device, where the first indication information is used to indicate a communication failure on the first downlink resource, and the first uplink resource is a resource for carrying channel state information CSI;

Optionally, the first indication information is carried in padding bits of the CSI; or,

the first indication information is carried in a non-zero wideband amplitude coefficient word field of the CSI; or,

the CSI includes a channel quality indication, CQI, field, with the first indication information carried in a status bit of the CQI field.

Optionally, the processing unit 610 is further configured to determine second indication information, where the second indication information includes one or more of identification information of the second cell, information of a first reference signal with a channel quality greater than or equal to a first preset threshold, or information of a second reference signal with a channel quality less than or equal to a second preset threshold;

the transceiver unit 620 is further configured to send the second indication information to the network device on the first uplink resource.

Optionally, the second indication information is carried in a field corresponding to the lowest priority content of the CSI.

Optionally, the CQI field comprises a wideband CQI field, and the first indication information is carried in a lowest state bit of the wideband CQI field.

Optionally, the CQI field includes a wideband CQI field and a subband CQI field, and the first indication information is carried in a status bit of the combination of the wideband CQI field and the subband CQI field.

It should be understood that, for brevity, the specific process of each unit in the apparatus 600 to perform the above corresponding steps is referred to in the foregoing description of the method embodiment in connection with fig. 4, and is not repeated herein.

Fig. 7 is a schematic block diagram of an apparatus 700 for recovering from communication failure provided in an embodiment of the present application, where the apparatus 700 may correspond to a network device described in the foregoing method 400, or may correspond to a chip or a component of the network device, and each module or unit in the apparatus 700 may be used to perform each action or process performed by the network device in the foregoing method 400, respectively, and as shown in fig. 7, the apparatus 700 for recovering from communication failure may include a transceiver unit 710 and a processing unit 720.

Specifically, the transceiver unit 710 is configured to receive, on a first uplink resource, first indication information sent by a terminal device, where the first indication information is used to indicate that communication of the terminal device on a first downlink resource fails, and the first uplink resource is a resource for carrying channel state information CSI;

A processing unit 720, configured to determine that the communication of the terminal device on the first downlink resource fails;

Optionally, the transceiver unit 710 is further configured to receive, on the first uplink resource, second indication information sent by the terminal device, where the second indication information includes one or more of identification information of the second cell, information of a first reference signal with a channel quality greater than or equal to a first preset threshold, or information of a second reference signal with a channel quality less than or equal to a second preset threshold;

the processing unit 720 is further configured to determine the second indication information.

It should be appreciated that, for brevity, the specific process of each unit in the apparatus 700 to perform the corresponding steps described above is referred to in the foregoing description of the method embodiment in connection with fig. 4, and is not repeated herein.

Fig. 8 is a schematic block diagram of an apparatus 800 for recovering from communication failure provided in an embodiment of the present application, where the apparatus 800 may correspond to a terminal device described in the foregoing method 500, or may correspond to a chip or a component of the terminal device, and each module or unit in the apparatus 800 may be used to perform each action or process performed by the terminal device in the foregoing method 500, respectively, and as shown in fig. 8, the apparatus 800 for recovering from communication failure may include a processing unit 810 and a transceiver unit 820.

Specifically, the processing unit 810 is configured to determine that the communication of the apparatus on the first downlink resource fails;

a transceiver unit 820, configured to send, on the second uplink resource, first indication information to the network device, where the first indication information is used to indicate that the device fails to communicate on the first downlink resource;

the transceiver 820 is further configured to receive communication failure response information in a time window from an nth time unit after the first indication information is sent and/or an mth time window from a time-frequency resource location for sending a downlink control channel, where the communication failure response information is a response to a communication failure on the first downlink resource carried on the second downlink resource;

Optionally, the processing unit 810 is further configured to determine the n or the m according to a system parameter of the third cell and/or the fourth cell.

Optionally, the transceiver unit 820 is further configured to receive third indication information;

optionally, the processing unit 820 is specifically configured to: determining the n or the m according to the minimum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

And determining the n or the m according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource.

The processing unit 810 is further configured to determine the n or the m according to the third indication information.

Optionally, the third indication information is carried in DCI, which is a signaling dedicated to instructing the apparatus to receive the communication failure response information.

Optionally, the third indication information is carried in a field of DCI, where the DCI is used for transmission of uplink data or downlink data.

Optionally, the field is carried in a time-frequency resource indicator field in the DCI.

It should be appreciated that, for brevity, the specific process of each unit in the apparatus 800 to perform the corresponding steps described above is referred to in the foregoing description of the method embodiment in connection with fig. 5, and is not repeated herein.

Fig. 9 is a schematic block diagram of an apparatus 900 for recovering from communication failure provided in this embodiment of the present application, where the apparatus 900 may correspond to a network device described in the foregoing method 500, or may also correspond to a chip or a component of the network device, and each module or unit in the apparatus 900 may be used to perform each action or process performed by the network device in the foregoing method 500, respectively, and as shown in fig. 9, the apparatus 900 for recovering from communication failure may include a transceiver unit 910 and a processing unit 920.

Specifically, the transceiver 910 is configured to receive, on the second uplink resource, first indication information sent by the terminal device, where the first indication information is used to indicate that communication of the terminal device on the first downlink resource fails;

a processing unit 920, configured to determine a communication failure of the terminal device on the first downlink resource;

The transceiver 910 is further configured to send, to the terminal device, communication failure response information in an x-th time unit after receiving the first indication information and/or in a time window in which a time-frequency resource for sending a downlink control channel starts, where the communication failure response information is a response to a communication failure on the first downlink resource carried on a second downlink resource;

wherein x is an integer greater than or equal to 0, y is an integer greater than or equal to 0, the second uplink resource belongs to a third cell, the second downlink resource belongs to a fourth cell, and the third cell and the fourth cell are different cells or the same cell; or,

Optionally, the processing unit 920 is further configured to determine the x or the y according to a system parameter of the third cell and/or the fourth cell.

Optionally, the processing unit 920 is specifically configured to: determining the x or the y according to the minimum value of the subcarrier spacing of the second uplink resource and the subcarrier spacing of the second downlink resource; or determining the x or the y according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource.

Optionally, the transceiver unit 910 is further configured to send third indication information to the terminal device, where the third indication information is used to instruct the terminal device to receive the communication failure response information.

Optionally, the transceiver unit 910 is further configured to send information of a first reference signal, where the first reference signal is a reference signal with a channel quality greater than or equal to a preset threshold.

Optionally, the third indication information is carried in DCI, which is a signaling dedicated to instructing the terminal device to receive the response information.

It should be understood that, for brevity, the specific process of each unit in the apparatus 900 to perform the corresponding steps described above is referred to in the foregoing description of the method embodiment in connection with fig. 5, and is not repeated herein.

In a hardware implementation, the processing unit may be a processor or a processing circuit; the transceiver unit may be a transceiver (or a transceiver circuit), etc., and the transceiver unit may constitute a communication interface.

In particular implementations, a processor may be used to perform, for example and without limitation, baseband related processing and a transceiver may be used to perform, for example and without limitation, radio frequency transceiving. The above devices may be provided on separate chips, or may be provided at least partially or entirely on the same chip. For example, the processor may be further divided into an analog baseband processor, which may be integrated on the same chip as the transceiver, and a digital baseband processor, which may be provided on a separate chip. With the continued development of integrated circuit technology, more and more devices may be integrated on the same chip, for example, a digital baseband processor may be integrated on the same chip with a variety of application processors (e.g., without limitation, graphics processors, multimedia processors, etc.). Such a chip may be referred to as a System On Chip (SOC). Whether the individual devices are independently disposed on different chips or integrally disposed on one or more chips is often dependent on the specific needs of the product design. The embodiment of the application does not limit the specific implementation form of the device.

It will be appreciated that, for a terminal device or a network device as referred to in the foregoing embodiments, the functions as referred to in any of the foregoing embodiments of the application may be implemented by executing program instructions by a hardware platform having a processor and a communication interface, respectively, and based on this, as shown in fig. 10, an embodiment of the application provides a schematic block diagram of an apparatus 1000 for recovering from communication failure, where the apparatus 1000 includes:

at least one processor 1001 optionally comprising a communication interface 1002 and a memory 1003, the communication interface 1002 for supporting communication interactions of the apparatus 1000 with other devices, the memory 1003 having program instructions; at least one processor 1001 runs the program instructions to enable functionality to be implemented in any one of the devices operating on any one of the embodiments described herein: a terminal device or a network device. In an alternative design, memory 1003 may be used to store program instructions necessary to implement the functions of the device described above or process data generated during execution of the program. Optionally, the apparatus 1000 may further comprise internal interconnection lines to enable communication interaction between the at least one processor 1001, the communication interface 1002, and the memory 1003. The at least one processor 1001 may be considered to be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

It should be understood that the methods, flows, operations, or steps related to various designs described in the embodiments of the present application can be implemented in a one-to-one correspondence by computer software, electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution, for example, the implementation of the program instruction may be implemented in a manner of implementing software and hardware decoupling in consideration of good versatility and low cost, and for example, the implementation may be implemented using a dedicated circuit in consideration of system performance and reliability. One of ordinary skill in the art may implement the described functionality using different methods for each particular application, and is not limited in this regard.

According to the method provided by the embodiment of the application, the application further provides a computer program product, which comprises: computer program code which, when run on a computer, causes the computer to perform the method in the above-described embodiments. The various embodiments in this application may also be combined with each other.

According to the method provided by the embodiment of the application, the application further provides a computer readable medium storing a program code, which when run on a computer, causes the computer to perform the method in the embodiment.

According to the method provided by the embodiment of the application, the application also provides a system which comprises the terminal equipment and the network equipment.

In the embodiments of the present application, it should be noted that the method embodiments described in the embodiments of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (Field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. There are many different types of RAM, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In addition, the terms "system" and "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The terms "first," "second," and the like in this application are used merely to distinguish between different objects, and the terms "first," "second," and the like do not per se limit the actual order or function of the modified objects. Any embodiment or design described herein as "exemplary," "example," "for example," "alternative design," or "one design" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of these words is intended to present the relevant concepts in a concrete fashion.

The terms "upstream" and "downstream" as used herein are used to describe the direction of data/information transmission in a specific scenario, for example, the "upstream" direction generally refers to the direction in which data/information is transmitted from a terminal to a network side, or the direction in which a distributed unit is transmitted to a centralized unit, and the "downstream" direction generally refers to the direction in which data/information is transmitted from a network side to a terminal, or the direction in which a centralized unit is transmitted to a distributed unit.

Various objects such as various messages/information/devices/network elements/systems/devices/actions/operations/processes/concepts may be named in the present application, and it should be understood that these specific names do not constitute limitations on related objects, and that the named names may be changed according to the scenario, context, or usage habit, etc., and understanding of technical meaning of technical terms in the present application should be mainly determined from functions and technical effects that are embodied/performed in the technical solution.

In the above embodiments, the implementation may be implemented in whole or in part 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 may include one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital Subscriber (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic disk), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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

1. A method for communication failure recovery, comprising:

the method comprises the steps that terminal equipment sends first indication information to network equipment on first uplink resources, wherein the first indication information is used for indicating communication failure on first downlink resources, and the first uplink resources are used for bearing Channel State Information (CSI);

The first uplink resource belongs to a first cell, the first downlink resource belongs to a second cell, and the first cell and the second cell are different cells or the same cell; or the spatial related parameter associated with the first downlink resource is different from the spatial related parameter associated with the first uplink resource.

2. The method of claim 1, wherein the first indication information is carried in padding bits of the CSI; or,

the CSI includes a channel quality indication, CQI, field, the first indication information being carried in a status bit of the CQI field.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

and the terminal equipment sends second indication information to the network equipment on the first uplink resource, wherein the second indication information comprises one or more of identification information of the second cell, information of a first reference signal with channel quality being greater than or equal to a first preset threshold, or information of a second reference signal with channel quality being less than or equal to a second preset threshold.

4. A method according to claim 3, wherein the second indication information is carried in a field corresponding to the lowest priority content of the CSI.

5. The method of claim 2, wherein the CQI field comprises a wideband CQI field, and wherein the first indication information is carried in a lowest state bit of the wideband CQI field.

6. The method of claim 2, wherein the CQI field comprises a wideband CQI field and a subband CQI field, and wherein the first indication information is carried in a status bit of a combination of the wideband CQI field and the subband CQI field.

7. The method according to claim 1 or 2, characterized in that the first downlink resource is a physical downlink control channel, PDCCH, resource.

8. The method according to claim 1 or 2, wherein the first uplink resource is a physical uplink control channel, PUCCH, resource or a physical uplink shared channel, PUSCH, resource.

9. A method for communication failure recovery, comprising:

the network equipment receives first indication information sent by the terminal equipment on first uplink resources, wherein the first indication information is used for indicating communication failure of the terminal equipment on first downlink resources, and the first uplink resources are resources used for bearing Channel State Information (CSI);

10. The method of claim 9, wherein the first indication information is carried in padding bits of the CSI; or,

11. The method according to claim 9 or 10, characterized in that the method further comprises:

and the network equipment receives second indication information sent by the terminal equipment on the first uplink resource, wherein the second indication information comprises one or more of identification information of the second cell, information of a first reference signal with channel quality being greater than or equal to a first preset threshold, or information of a second reference signal with channel quality being less than or equal to a second preset threshold.

12. The method of claim 11, wherein the second indication information is carried in a field corresponding to a lowest priority content of the CSI.

13. The method of claim 10, wherein the CQI field comprises a wideband CQI field, and wherein the first indication information is carried in a lowest state bit of the wideband CQI field.

14. The method of claim 10, wherein the CQI field comprises a wideband CQI field and a subband CQI field, and wherein the first indication information is carried in a status bit of a combination of the wideband CQI field and the subband CQI field.

15. The method according to claim 9 or 10, characterized in that the first downlink resource is a physical downlink control channel, PDCCH, resource.

16. The method according to claim 9 or 10, wherein the first uplink resource is a physical uplink control channel, PUCCH, resource or a physical uplink shared channel, PUSCH, resource.

17. A method for communication failure recovery, comprising:

the terminal equipment sends first indication information to the network equipment on second uplink resources, wherein the first indication information is used for indicating communication failure on first downlink resources, and the first downlink resources belong to a second cell;

The terminal equipment detects communication failure response information in an nth time unit after the first indication information is sent and/or in a time window when the mth time unit is used for sending the time-frequency resource position of a downlink control channel, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource;

18. The method of claim 17, wherein the method further comprises:

and the terminal equipment determines the n or the m according to the system parameters of the third cell and/or the fourth cell.

19. The method according to claim 18, wherein the system parameter comprises a subcarrier spacing, wherein the terminal equipment determines the n or the m according to the system parameter of the third cell and/or the fourth cell, comprising:

The terminal equipment determines the n or the m according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

20. The method of claim 17, wherein the method further comprises:

the terminal equipment receives third indication information;

and the terminal equipment determines the n or the m according to the third indication information.

21. The method of claim 20, wherein the third indication information comprises one or more of information indicating a start time of receiving the communication failure response information, identification information of the fourth cell, identification information of a set of control resources for receiving the communication failure response information, or identification information of a set of search spaces for receiving the communication failure response information.

22. The method according to claim 20 or 21, wherein the third indication information is carried in one or more of downlink control information, DCI, medium access control layer control element, MAC CE, or radio resource control, RRC, signaling.

23. The method of claim 22, wherein the third indication information is carried in DCI, the DCI being signaling dedicated to instruct the terminal device to receive the communication failure response information.

24. The method of claim 22, wherein the third indication information is carried in a field of DCI, the DCI being used for transmission of uplink data or downlink data.

25. The method of claim 24, wherein the field is carried in a time-frequency resource indicator field in the DCI.

26. A method of communication failure, comprising:

the network equipment receives first indication information sent by the terminal equipment on second uplink resources, wherein the first indication information is used for indicating communication failure on first downlink resources, and the first downlink resources belong to a second cell;

the network equipment sends communication failure response information to the terminal equipment in an x time unit after receiving the first indication information and/or in a time window when a time-frequency resource for sending a downlink control channel starts, wherein the communication failure response information is a response to communication failure on the first downlink resource, which is carried on a second downlink resource;

27. The method of claim 26, wherein the method further comprises:

the network device determines the x or the y according to the system parameters of the third cell and/or the fourth cell.

28. The method according to claim 27, wherein the system parameters comprise subcarrier spacing and wherein the network device determines the x or the y based on the system parameters of the third cell and/or the fourth cell, comprising:

The network equipment determines the x or the y according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

The network equipment determines the x or the y according to the minimum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell; or alternatively

And the network equipment determines the x or the y according to the maximum value of the subcarrier interval of the uplink carrier of the third cell and the subcarrier interval of the downlink carrier of the fourth cell.

29. The method of claim 26, wherein the method further comprises:

the network device sends third indication information to the terminal device, wherein the third indication information is used for indicating the terminal device to receive the communication failure response information.

30. The method of claim 29, wherein the third indication information comprises one or more of information indicating a start time of receiving the communication failure response information, identification information of the fourth cell, identification information of a set of control resources for receiving the communication failure response information, or identification information of a set of search spaces for receiving the communication failure response information.

31. The method according to any one of claims 26 to 30, further comprising:

The network device sends information of a first reference signal, wherein the first reference signal is a reference signal with channel quality being greater than or equal to a preset threshold.

32. The method according to claim 29 or 30, characterized in that the third indication information is carried in one or more of downlink control information, DCI, medium access control layer control element, MAC CE, or radio resource control, RRC, signaling.

33. The method of claim 32, wherein the third indication information is carried in DCI, the DCI being signaling dedicated to instruct the terminal device to receive the response information.

34. The method of claim 32, wherein the third indication information is carried in a field of DCI, the DCI being used for transmission of uplink data or downlink data.

35. The method of claim 34, wherein the field is carried in a time-frequency resource indicator field in the DCI.

36. An apparatus for communication failure recovery, comprising:

a processing unit configured to determine that communication on the first downlink resource fails;

a transceiver unit, configured to send first indication information to a network device on a first uplink resource, where the first indication information is used to indicate a communication failure on the first downlink resource, and the first uplink resource is a resource for carrying channel state information CSI;

37. The apparatus of claim 36, wherein the first indication information is carried in padding bits of the CSI; or,

38. The apparatus of claim 36 or 37, wherein the transceiver unit is further configured to send second indication information to the network device on the first uplink resource, where the second indication information includes one or more of identification information of the second cell, information of a first reference signal with a channel quality greater than or equal to a first preset threshold, or information of a second reference signal with a channel quality less than or equal to a second preset threshold.

39. The apparatus of claim 38, wherein the second indication information is carried in a field corresponding to a lowest priority content of the CSI.

40. The apparatus of claim 37, wherein the CQI field comprises a wideband CQI field, and wherein the first indication information is carried in a lowest state bit of the wideband CQI field.

41. The apparatus of claim 37, wherein the CQI field comprises a wideband CQI field and a subband CQI field, and wherein the first indication information is carried in a status bit of a combination of the wideband CQI field and the subband CQI field.

42. The apparatus of claim 36 or 37, wherein the first downlink resource is a physical downlink control channel, PDCCH, resource.

43. The apparatus of claim 36 or 37, wherein the first uplink resource is a physical uplink control channel, PUCCH, resource or a physical uplink shared channel, PUSCH, resource.

44. An apparatus for communication failure recovery, comprising:

the receiving and transmitting unit is used for receiving first indication information sent by the terminal equipment on first uplink resources, wherein the first indication information is used for indicating communication failure on first downlink resources, and the first uplink resources are resources used for bearing Channel State Information (CSI);

A processing unit, configured to determine that communication on the first downlink resource fails;

45. The apparatus of claim 44, wherein the first indication information is carried in padding bits of the CSI; or,

46. The apparatus of claim 44 or 45, wherein the transceiver unit is further configured to receive, on the first uplink resource, second indication information sent by the terminal device, where the second indication information includes one or more of identification information of the second cell, information of a first reference signal with channel quality greater than or equal to a first preset threshold, or information of a second reference signal with channel quality less than or equal to a second preset threshold.

47. The apparatus of claim 46, wherein the second indication information is carried in a field corresponding to lowest priority content of the CSI.

48. The apparatus of claim 45, wherein the CQI field comprises a wideband CQI field, and wherein the first indication information is carried in a lowest state bit of the wideband CQI field.

49. The apparatus of claim 45, wherein the CQI field comprises a wideband CQI field and a sub-band CQI field, and wherein the first indication information is carried in a status bit of a combination of the wideband CQI field and the sub-band CQI field.

50. The apparatus of claim 44 or 45, wherein the first downlink resource is a physical downlink control channel, PDCCH, resource.

51. The apparatus of claim 44 or 45, wherein the first uplink resource is a physical uplink control channel, PUCCH, resource or a physical uplink shared channel, PUSCH, resource.

52. An apparatus for communication failure recovery, comprising:

a transceiver unit, configured to send, on a second uplink resource, first indication information to a network device, where the first indication information is used to indicate that communication of the device on the first downlink resource fails, and the first downlink resource belongs to a second cell;

The transceiver unit is further configured to detect, in an nth time unit after the first indication information is sent, and/or in a time window in which a time-frequency resource location of the mth time unit for sending the downlink control channel begins, communication failure response information, where the communication failure response information is a response to communication failure on the first downlink resource carried on a second downlink resource;

53. The apparatus of claim 52, wherein the processing unit is further configured to determine the n or the m based on system parameters of the third cell and/or the fourth cell, the system parameters comprising subcarrier spacing.

54. The apparatus of claim 53, wherein the processing unit is specifically configured to:

Determining the n or the m according to the minimum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

Determining the n or the m according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

Determining the n or the m according to the minimum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell; or alternatively

And determining the n or the m according to the maximum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell.

55. The apparatus of claim 53, wherein the transceiver unit is further configured to receive third indication information;

the processing unit is further configured to determine the n or the m according to the third indication information.

56. The apparatus of claim 55, wherein the third indication information comprises one or more of information indicating a starting time of receiving the communication failure response information, identification information of the fourth cell, identification information of a set of control resources for receiving the communication failure response information, or identification information of a set of search spaces for receiving the communication failure response information.

57. The apparatus of claim 55 or 56, wherein the third indication information is carried in one or more of downlink control information DCI, a medium access control layer control element MAC CE, or radio resource control RRC signaling.

58. The apparatus of claim 57, wherein the third indication information is carried in DCI, the DCI being signaling dedicated to instruct the apparatus to receive the communication failure response information.

59. The apparatus of claim 57, wherein the third indication information is carried in a field of DCI for transmission of uplink data or downlink data.

60. The apparatus of claim 59, wherein the field is carried in a time-frequency resource indicator field in the DCI.

61. An apparatus for communication failure recovery, comprising:

the receiving and transmitting unit is used for receiving first indication information sent by the terminal equipment on the second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource, and the first downlink resource belongs to a second cell;

The transceiver unit is further configured to send, to the terminal device, communication failure response information in an x-th time unit after receiving the first indication information and/or in a time window in which a time-frequency resource for sending a downlink control channel starts, where the communication failure response information is a response to a communication failure on the first downlink resource, where the response is carried on a second downlink resource;

62. The apparatus of claim 61, wherein the processing unit is further configured to determine the x or the y based on system parameters of the third cell and/or fourth cell.

63. The apparatus of claim 62, wherein the system parameters comprise subcarrier spacing, and wherein the processing unit is configured to:

Determining the x or the y according to the minimum value of the subcarrier spacing of the second uplink resource and the subcarrier spacing of the second downlink resource; or alternatively

Determining the x or the y according to the maximum value of the subcarrier interval of the second uplink resource and the subcarrier interval of the second downlink resource; or alternatively

Determining the x or the y according to the minimum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell; or alternatively

And determining the x or the y according to the maximum value of the subcarrier spacing of the uplink carrier of the third cell and the subcarrier spacing of the downlink carrier of the fourth cell.

64. The apparatus of claim 62, wherein the transceiver unit is further configured to send third indication information to the terminal device, the third indication information being configured to instruct the terminal device to receive the communication failure response information.

65. The apparatus of claim 64, wherein the third indication information comprises one or more of information indicating a starting time of receiving the communication failure response information, identification information of the fourth cell, identification information of a set of control resources for receiving the communication failure response information, or identification information of a set of search spaces for receiving the communication failure response information.

66. The apparatus of any one of claims 62-65, wherein the transceiver unit is further configured to send information of a first reference signal, the first reference signal being a reference signal with a channel quality greater than or equal to a preset threshold.

67. The apparatus of claim 64 or 65, wherein the third indication information is carried in one or more of downlink control information, DCI, a medium access control layer control element, MAC CE, or radio resource control, RRC, signaling.

68. The apparatus of claim 67, wherein the third indication information is carried in DCI, the DCI being signaling dedicated to instructing the terminal device to receive the response information.

69. The apparatus of claim 67, wherein the third indication information is carried in a field of DCI for transmission of uplink data or downlink data.

70. The apparatus of claim 69, wherein the field is carried in a time-frequency resource indicator field in the DCI.

71. A method for communication failure recovery, comprising:

the terminal equipment sends first indication information to the network equipment in a p-th time unit on a second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource, and the first downlink resource belongs to a second cell;

72. The method of claim 71, wherein the p time units are time units determined based on system parameters of an uplink carrier of the third cell; or alternatively

73. The method according to claim 71 or 72, wherein the q-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

74. The method of claim 73, wherein q is determined by any one of equation (1), equation (2), equation (3), equation (4), or equation (5);

wherein,for the lower rounding operation, ++>Performing rounding operation; the K is an integer greater than or equal to 0; the μ1 is a system parameter of an uplink carrier of the third cell, or the μ1 is a system parameter of a second uplink resource, or the μ1 is a system parameter of a third uplink resource of the third cell; μ2 is a system parameter of a downlink carrier of the fourth cell, or μ2 is a system parameter of a second downlink resource of the fourth cell; alternatively, μ2 is a system parameter of the third downlink resource of the fourth cell.

75. A method for communication failure recovery, comprising:

the network equipment sends first indication information to the receiving terminal equipment in a t-th time unit on a second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource, and the first downlink resource belongs to a second cell;

76. The method of claim 75, wherein the t time units are time units determined based on system parameters of an uplink carrier of the third cell; or alternatively

77. The method according to claim 75 or 76, wherein the s-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

78. The method of claim 77, wherein s is determined by any one of equation (6), equation (7), equation (8), equation (9), or equation (10);

wherein,for the lower rounding operation, ++>Performing rounding operation; l is an integer greater than or equal to 0; mu 1 is the firstThe system parameter of the uplink carrier of the third cell, or, μ1 is the system parameter of the second uplink resource, or, μ1 is the system parameter of the third uplink resource of the third cell; μ2 is a system parameter of a downlink carrier of the fourth cell, or μ2 is a system parameter of a second downlink resource of the fourth cell; alternatively, μ2 is a system parameter of the third downlink resource of the fourth cell.

79. An apparatus for communication failure recovery, comprising:

the receiving and transmitting unit is used for transmitting first indication information to the network equipment in a p-th time unit on the second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource, and the first downlink resource belongs to a second cell;

The receiving and transmitting unit is further configured to detect communication failure response information in a time window started by a qth time unit or a qth time unit, where the communication failure response information is a response to a communication failure on the first downlink resource, where the response is carried on a second downlink resource;

80. The apparatus of claim 79, wherein the p time units are time units determined according to system parameters of an uplink carrier of the third cell; or alternatively

81. The apparatus according to claim 79 or 80, wherein the q-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

82. The apparatus of claim 81, wherein q is determined by any one of equation (1), equation (2), equation (3), equation (4), or equation (5);

83. An apparatus for communication failure recovery, comprising:

the receiving and transmitting unit is used for transmitting first indication information to the receiving terminal equipment in a t-th time unit on the second uplink resource, wherein the first indication information is used for indicating communication failure on a first downlink resource, and the first downlink resource belongs to a second cell;

The receiving and transmitting unit is further configured to send communication failure response information to the terminal device in an s-th time unit or a time window started by the s-th time unit, where the communication failure response information is a response to a communication failure on the first downlink resource, where the response is carried on a second downlink resource;

84. The apparatus of claim 83, wherein the t time units are time units determined based on system parameters of an uplink carrier of the third cell; or alternatively

85. The apparatus according to claim 83 or 84, wherein the s-th time unit is a time unit determined according to a system parameter of an uplink carrier of the third cell and a system parameter of a downlink carrier of a fourth cell; or alternatively

86. The apparatus of claim 85, wherein s is determined by any one of equation (6), equation (7), equation (8), equation (9), or equation (10);

wherein,for the lower rounding operation, ++>Performing rounding operation; l is an integer greater than or equal to 0; the μ1 is a system parameter of an uplink carrier of the third cell, or the μ1 is a system parameter of a second uplink resource, or the μ1 is a system parameter of a third uplink resource of the third cell; μ2 is a system parameter of a downlink carrier of the fourth cell, or μ2 is a system parameter of a second downlink resource of the fourth cell; alternatively, μ2 is a system parameter of the third downlink resource of the fourth cell. />