Terminal device, base station, and communications method of terminal device and base station

1. A communications method, comprising:

determining, by a terminal device, identification information of a communications group including the terminal device and corresponding to a logical channel group;

generating, by the terminal device, transmission information about an amount of to-be-transmitted data, the transmission information including the identification information of the communications group, and a buffer status report of the logical channel group corresponding to the communications group, wherein the buffer status report indicates the amount of the to-be-transmitted data waiting to be transmitted in the logical channel group between the terminal device and another terminal device; and

sending, by the terminal device, the transmission information to a base station.

2. The method according to claim 1 , further comprises:

receiving, by the terminal device from the base station, resource information about a resource allocated by the base station for the communications group, the resource information including the identification information of the communications group; and

transmitting, by the terminal device, communication data in the communications group by using the resource.

3. The method according to claim 2 , wherein the sending of the transmission information by the terminal device to the base station comprises:

sending one MAC control element including the transmission information of the communications group that has communication data to be sent.

4. The method according to claim 1 , wherein

the identification information of the communications group is a group identifier for proximity service (ProSe).

5. The method according to claim 1 , wherein

the buffer status report includes a buffer size.

6. The method according to claim 5 , wherein

the buffer status report only provides the buffer size.

7. The method according to claim 1 , wherein:

the identification information of the communications group comprises an index number of the communications group.

8. The method according to claim 1 , the method further comprises:

entering, by the terminal device, a triggering state upon determination that a buffer of a communications group has changed from a state of having no data waiting to be sent to a state of having data waiting to be sent.

9. The communications method according to claim 1 , wherein the communications group is a first communications group, the logical channel group is the first logical channel group, and the method further comprises:

determining, by the terminal device, identification information of a second communications group including the terminal device and corresponding to a second logical channel group; and, wherein

the transmission information further includes the identification information of the second communications group, and a buffer status report of the second logical channel group corresponding to the communications group.

10. A communications method, comprising:

receiving, by a network device from a terminal device, transmission information about an amount of to-be-transmitted data, the transmission information including identification information of a communications group that includes the terminal device, and a buffer status report of a logical channel group corresponding to the communications group, wherein the buffer status report indicates the amount of the to-be-transmitted data waiting to be transmitted in the logical channel group between the terminal device and another terminal device;

allocating, by the network device, a resource to the terminal device in response to the transmission information; and

sending resource information about the resource to the terminal device by the network device, the resource information including the identification information of the communications group.

11. The method according to claim 10 , wherein

the identification information of the communications group is a group identifier for proximity service (ProSe).

12. The method according to claim 10 , wherein

the buffer status report includes a buffer size.

13. The method according to claim 10 , wherein:

the identification information of the communications group includes an index number of the communications group.

14. The method according to claim 10 , wherein the receiving comprises:

receiving, by the network device, one MAC control element including the transmission information of the communications group that has communication data to be sent.

15. The communications method according to claim 10 , wherein the communications group is a first communications group, the logical channel group is the first logical channel group; and, wherein

the transmission information about an amount of to-be-transmitted data further includes identification information of a second communications group that includes the terminal device, and a buffer status report of a second logical channel group corresponding to the second communications group; and

the resource information further includes information indicating a resource allocated to the terminal device for the second communications group.

16. A communication device communicating with a base station, comprising:

a processor; and

a non-transitory memory configured to store an execution instruction that when executed by the processor causes the device to

determine identification information of a communications group including the communication device and corresponding to a logical channel group;

generate transmission information about an amount of to-be-transmitted data, the transmission information including the identification information of the communications group, and a buffer status report of the logical channel group corresponding to the communications group, wherein the buffer status report indicates the amount of the to-be-transmitted data waiting to be transmitted in the logical channel group between the terminal device and another terminal device; and

send the transmission information about to the base station.

17. The communication device according to claim 16 , wherein when the execution instruction is executed the device is enabled to

receive from the base station, resource information about a resource allocated by the base station for the communications group, the resource information including the identification information of the communications group; and

transmit communication data in the communications group by using the resource.

18. The communication device according to claim 16 , wherein

the identification information of the communications group is a group identifier for proximity service (ProSe).

19. The communication device according to claim 16 , wherein at least one of the buffer status report includes a buffer size, and

the identification information of the communications group includes an index number of the communications group.

20. The communication device according to claim 16 , wherein sending of the transmission information about the amount of the to-be-transmitted data to the base station comprises:

sending one MAC control element to the base station, the MAC control element including the transmission information of the communications group that has communication data to be sent.