Communication method and communications apparatus
This application provides example communication methods and example communications apparatuses. One example communication method includes sending first information on a first resource, where the first information is used to indicate a link failure. Second information can then be received, where the second information is used to indicate a second resource. Third information can then be sent on the second resource based on the second information, where the third information is used to indicate at least one of a first reference signal or a first cell, and where when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell.
1 . A communication method, comprising: sending, by a terminal device, first information on a first resource, wherein the first information indicates a link failure;
receiving, by the terminal device, second information, wherein the second information indicates a second resource, and wherein the second information comprises at least one of downlink control information (DCI) in a dedicated search space or DCI scrambled by a dedicated radio network temporary identifier (RNTI);
sending, by the terminal device, third information on the second resource based on the second information, wherein the third information indicates at least one of a first reference signal or a first cell, and wherein when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell;
detecting, by the terminal device and based on the third information, fourth information indicating link failure recovery response information; in response to detecting the fourth information, deactivating, by the terminal device, the second resource; and
determining that the first reference signal is available based on determining that the fourth information is received using a QCL (quasi co-location)-TypeD spatial receive parameter corresponding to the first reference signal.
2 . The method according to claim 1 , wherein the fourth information is detected in a first time period, wherein a start moment of the first time period is after a sending moment of the third information.
3 . The method according to claim 2 , wherein the fourth information is one of the following information:
DCI scrambled by using a cell radio network temporary identifier (C-RNTI), DCI scrambled by using a modulation and coding scheme cell specific radio network temporary identifier (MCS-C-RNTI), DCI in a dedicated search space, DCI scrambled by using a dedicated RNTI, DCI scrambled by using a random access radio network temporary identifier (RA-RNTI), DCI comprising a preset state value, DCI comprising transmission configuration indicator (TCI) information, quasi co-location (QCL) indication information of the first cell, or DCI in a preset format, wherein the DCI in the preset format indicates newly transmitted data.
4 . The method according to claim 3 , wherein the DCI in the preset format is DCI having a toggled new data indicator (NDI) field, and wherein the toggled NDI field is a field in the DCI.
5 . The method according to claim 2 , wherein the method further comprises:
after the fourth information is received, receiving a physical downlink control channel (PDCCH) or sending a physical uplink control channel (PUCCH) based on the first reference signal.
6 . A communication method, comprising:
receiving, by a network device, first information on a first resource, wherein the first information indicates a link failure;
sending, by the network device, second information to a terminal device, wherein the second information indicates a second resource, and wherein the second information comprises at least one of downlink control information (DCI) in a dedicated search space or DCI scrambled by a dedicated radio network temporary identifier (RNTI);
receiving, by the network device, third information on the second resource based on the second information, wherein the third information indicates at least one of a first reference signal or a first cell, and wherein when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell;
sending, by the network device to the terminal device, fourth information indicating link failure recovery response information, wherein whether the fourth information is received using a QCL (quasi co-location)-TypeD spatial receive parameter corresponding to the first reference signal indicates whether the first reference signal is available when the fourth information is received by the terminal device; and
deactivating, by the network device, the second resource.
7 . The method according to claim 6 , wherein the fourth information is one of the following information:
DCI scrambled by using a cell radio network temporary identifier (C-RNTI), DCI scrambled by using a modulation and coding scheme cell specific radio network temporary identifier (MCS-C-RNTI), DCI in a dedicated search space, DCI scrambled by using a dedicated RNTI, DCI scrambled by using a random access radio network temporary identifier (RA-RNTI), DCI comprising a preset state value, DCI comprising transmission configuration indicator (TCI) information, quasi co-location (QCL) indication information of the first cell, or DCI in a preset format, wherein the DCI in the preset format indicates newly transmitted data.
8 . The method according to claim 7 , wherein the DCI in the preset format is DCI having a toggled new data indicator (NDI) field, and wherein the toggled NDI field is a field in the DCI.
9 . The method according to claim 6 , wherein the method further comprises:
after the fourth information is sent, sending a physical downlink control channel (PDCCH) or receiving a physical uplink control channel (PUCCH) based on the first reference signal.
10 . A communications apparatus, comprising: a transmitter;
a receiver;
at least one processor; and
one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
send, by the transmitter, first information on a first resource, wherein the first information indicates a link failure;
receive, by the receiver, second information, wherein the second information indicates a second resource, and wherein the second information comprises at least one of downlink control information (DCI) in a dedicated search space or DCI scrambled by a dedicated radio network temporary identifier (RNTI); send, by the transmitter, third information on the second resource based on the second information, wherein the third information indicates at least one of a first reference signal or a first cell, and wherein when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell;
detect, based on the third information, fourth information indicating link failure recovery response information;
in response to detecting the fourth information, deactivate the second resource; and
determine that the first reference signal is available based on determining that the fourth information is received using a QCL (quasi co-location)-TypeD spatial receive parameter corresponding to the first reference signal.
11 . The apparatus according to claim 10 , wherein the fourth information is detected in a first time period, wherein a start moment of the first time period is after a sending moment of the third information.
12 . The apparatus according to claim 11 , wherein the fourth information is one of the following information:
DCI scrambled by using a cell radio network temporary identifier (C-RNTI), DCI scrambled by using a modulation and coding scheme cell specific radio network temporary identifier (MCS-C-RNTI), DCI in a dedicated search space, DCI scrambled by using a dedicated RNTI, DCI scrambled by using a random access radio network temporary identifier (RA-RNTI), DCI comprising a preset state value, DCI comprising transmission configuration indicator (TCI) information, quasi co-location (QCL) indication information of the first cell, or DCI in a preset format, wherein the DCI in the preset format indicates newly transmitted data.
13 . The apparatus according to claim 12 , wherein the DCI in the preset format is DCI having a toggled new data indicator (NDI) field, and wherein the toggled NDI field is a field in the DCI.
14 . The apparatus according to claim 11 , wherein the programming instructions are for execution by the at least one processor to:
after the fourth information is received, receive, by the receiver, a physical downlink control channel (PDCCH) based on the first reference signal; or
after the fourth information is received, send, by the transmitter, a physical uplink control channel (PUCCH) based on the first reference signal.
15 . A communications apparatus, comprising:
a receiver;
a transmitter;
at least one processor; and one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to:
receive, by the receiver, first information on a first resource, wherein the first information indicates a link failure;
send, by the transmitter, second information, wherein the second information indicates a second resource, and wherein the second information comprises at least one of downlink control information (DCI) in a dedicated search space or DCI scrambled by a dedicated radio network temporary identifier (RNTI);
receive, by the receiver, third information on the second resource based on the second information, wherein the third information indicates at least one of a first reference signal or a first cell, and wherein when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell;
send, to a terminal device, fourth information indicating link failure recovery response information, wherein whether the fourth information is received using a QCL (quasi co-location)-TypeD spatial receive parameter corresponding to the first reference signal indicates whether the first reference signal is available when the fourth information is received by the terminal device; and
deactivate the second resource.
16 . The apparatus according to claim 15 , wherein the fourth information is one of the following information:
DCI scrambled by using a cell radio network temporary identifier (C-RNTI), DCI scrambled by using a modulation and coding scheme cell specific radio network temporary identifier (MCS-C-RNTI), DCI in a dedicated search space, DCI scrambled by using a dedicated RNTI, DCI scrambled by using a random access radio network temporary identifier (RA-RNTI), DCI comprising a preset state value, DCI comprising transmission configuration indicator (TCI) information, quasi co-location (QCL) indication information of the first cell, or DCI in a preset format, wherein the DCI in the preset format indicates newly transmitted data.
17 . The apparatus according to claim 16 , wherein the DCI in the preset format is DCI having a toggled new data indicator (NDI) field, and wherein the toggled NDI field is a field in the DCI.
18 . The apparatus according to claim 15 , wherein the programming instructions are for execution by the at least one processor to:
after the fourth information is sent, send, by the transmitter, a physical downlink control channel (PDCCH) based on the first reference signal; or
after the fourth information is sent, receive, by the receiver, a physical uplink control channel (PUCCH) based on the first reference signal.
19 . A non-transitory computer-readable storage medium storing programming instructions for execution by at least one processor, that when executed by the at least one processor, cause a computer to perform operations comprising:
sending, by a terminal device, first information on a first resource, wherein the first information indicates a link failure;
receiving, by the terminal device, second information, wherein the second information indicates a second resource, and wherein the second information comprises at least one of downlink control information (DCI) in a dedicated search space or DCI scrambled by a dedicated radio network temporary identifier (RNTI);
sending, by the terminal device, third information on the second resource based on the second information, wherein the third information indicates at least one of a first reference signal or a first cell, and wherein when channel quality of the first reference signal is greater than or equal to a preset threshold, the link failure occurs in the first cell;
detecting, by the terminal device and based on the third information, fourth information indicating link failure recovery response information; in response to detecting the fourth information, deactivating, by the terminal device, the second resource; and determining that the first reference signal is available based on detecting determining that the fourth information is received using a QCL (quasi co-location)-TypeD spatial receive parameter corresponding to the first reference signal.