Indication information receiving method, and apparatus

1 . An indication information receiving method comprising:

receiving, by a first terminal device, first indication information from a first network device after a failure of communication between the first terminal device and a second network device occurred;

sending, by the first terminal device, information about at least one hybrid automatic repeat request (HARQ) process of the first terminal device to the first network device based on the first indication information, wherein the at least one HARQ process is an occupied HARQ process of the first terminal device, and the information about the at least one HARQ process comprises a process number of a first HARQ process; and

receiving, by the first terminal device, first data from the first network device through a second HARQ process, wherein the second HARQ process is an unoccupied HARQ process of the first terminal device.

2 . The method according to claim 1 , wherein

the information about the at least one HARQ process further comprises a new data indicator (NDI) corresponding to the first HARQ process.

3 . The method according to claim 1 , further comprising:

receiving, by the first terminal device, second indication information: from the first network device; and

clearing, by the first terminal device, a buffer of the at least one HARQ process of the first terminal device based on the second indication information.

4 . The method according to claim 1 , wherein the communication between the first terminal device and the second network device before the failure occurs includes communication of a new data indicator (NDI) which indicates a new data transmission.

5 . An indication information sending method comprising:

sending, by a first network device, first indication information to a first terminal device after a failure of communication between the first terminal device and a second network device occurred, wherein the first indication information indicates the first terminal device to send information about at least one hybrid automatic repeat request (HARQ) process of the first terminal device to the first network device;

receiving, by the first network device, the information about the at least one HARQ process from the first terminal device, wherein the at least one HARQ process is an occupied HARQ process of the first terminal device, and the information about the at least one HARQ process comprises a process number of a first HARQ process; and

sending, by the first network device, first data to the first terminal device through a second HARQ process, wherein the second HARQ process is an unoccupied HARQ process of the first terminal device.

6 . The method according to claim 1 , wherein:

before the first terminal device receives the first indication information from the first network device, a second network device that communicates with the first terminal device is faulty; and

the first terminal device communicates with the second network device before the fault by the second network device occurs; and

the information about the at least one HARQ process has been exchanged between the first network device and the second network device in real time before the fault by the second network device occurs.

7 . The method according to claim 1 , wherein the information about the at least one HARQ process further comprises information that a HARQ buffer corresponding to the at least one HARQ process is occupied.

8 . The method according to claim 5 , wherein

the information about the at least one HARQ process further comprises a new data indicator (NDI) corresponding to the first HARQ process.

9 . A communication apparatus comprising:

one or more processors; and

a non-transitory computer-readable storage medium storing a program including instructions to be executed by the one or more processors such that the communication apparatus is configured at least to:

receive first indication information from a first network device after a failure of communication between the communication apparatus and a second network device occurred; and

send information about at least one hybrid automatic repeat request (HARQ) process of the communication apparatus to the first network device based on the first indication information, wherein the at least one HARQ process is an occupied HARQ process of the communication apparatus, and the information about the at least one HARQ process comprises a process number of a first HARQ process, and

receive first data from the first network device through a second HARQ process, wherein the second HARQ process is an unoccupied HARQ process of the communication apparatus.

10 . The method according to claim 5 , wherein the communication between the first terminal device and the second network device before the failure occurs includes communication of includes communication of a new data indicator (NDI) which indicates a new data transmission.

11 . The method according to claim 5 , wherein:

before the first network device sends the first indication information, a second network device is faulty, and wherein the second network device is a network device that is configured to communicate with the first terminal device before the fault by the second network device occurs; and

the first network device exchanges the information about the at least one HARQ process with the second network device in real time before the fault by the second network device occurs.

12 . The method according to claim 5 , wherein the information about the at least one HARQ process further comprises information that a HARQ buffer corresponding to the at least one HARQ process is occupied.

13 . A communication apparatus comprising:

one or more processors; and

a non-transitory computer-readable storage medium storing a program including instructions to be executed by the one or more processors such that the communication apparatus is configured at least to:

send first indication information to a first terminal device after a failure of communication between the first terminal device and a network device occurred, wherein the first indication information indicates the first terminal device to send information about at least one hybrid automatic repeat request (HARQ) process of the first terminal device to the communication apparatus; and

receive the information about the at least one HARQ process from the first terminal device, wherein the at least one HARQ process is an occupied HARQ process of the first terminal device, and the information about the at least one HARQ process comprises a process number of a first HARQ process; and

send first data to the first terminal device through a second HARQ process, wherein the second HARQ process is an unoccupied HARQ process of the first terminal device.

14 . The communication apparatus according to claim 9 , wherein

the information about the at least one HARQ process further comprises a new data indicator (NDI) corresponding to the first HARQ process.

15 . The communication apparatus according to claim 9 , wherein the communication apparatus is further configured to:

receive second indication information from the first network device; and

clear a buffer of the at least one HARQ process of the communication apparatus based on the second indication information.

16 . The communication apparatus according to claim 9 , wherein:

before receipt of the first indication information from the first network device, a second network device that is configured to communicate with the communication apparatus that the second network device is faulty; and

the communication apparatus is configured to communicate with the second network device before the fault by the second network device occurs; and

the information about the at least one HARQ process has been exchanged between the first network device and the second network device in real time before the fault by the second network device occurs.

17 . The communication apparatus according to claim 9 , wherein the information about the at least one HARQ process further comprises information that a HARQ buffer corresponding to the at least one HARQ process is occupied.

18 . The communication apparatus according to claim 13 , wherein

the information about the at least one HARQ process further comprises a new data indicator (NDI) corresponding to the first HARQ process.

19 . The communication apparatus according to claim 13 , wherein:

before the first indication information is sent, a network device is faulty, wherein the network device is configured to communicate with the first terminal device before the fault by the network device occurs; and

the communication apparatus is further configured exchange the information about the at least one HARQ process with the network device in real time before the fault by the network device occurs.

20 . The communication apparatus according to claim 13 , wherein the information about the at least one HARQ process further comprises information that a HARQ buffer corresponding to the at least one HARQ process is occupied.