Method and apparatus for reporting buffer status report

1. An apparatus, comprising a processor;

and a non-transitory computer-readable storage medium including computer-executable instructions executed by the processor to perform, on the apparatus, operations comprising:

receiving first uplink resource scheduling information from a base station, wherein the first uplink resource scheduling information is used to indicate a first uplink resource allocated to the apparatus;

determining whether the first uplink resource can carry an entire buffer status report (BSR) of the apparatus;

when the processor determines that the first uplink resource cannot carry the entire BSR of the apparatus, sending a first part of the entire BSR of the apparatus to the base station on the first uplink resource, wherein the first part does not comprise the entire BSR of the apparatus;

sending, to the base station, information indicating that the entire BSR has not been sent;

based on sending the information indicating that the entire BSR has not been sent, receiving second uplink resource scheduling information from the base station, wherein the second uplink resource scheduling information is used to indicate a second uplink resource allocated to the apparatus; and

sending the entire BSR of the apparatus to the base station on the second uplink resource.

2. The apparatus according to claim 1 , wherein the operations further comprise:

when the apparatus triggers reporting of a regular BSR and there is no uplink resource available for sending a BSR of the apparatus,

triggering reporting of a scheduling request (SR); and

sending a first SR to the base station.

3. The apparatus according to claim 2 , wherein the triggering, by the apparatus, reporting of a regular BSR comprises:

when the apparatus is switched from an autonomous resource selection mode to a base station-based resource scheduling mode and there is data on a current device to device (D2D) logical channel of the apparatus to be transmitted,

triggering the reporting of a regular BSR.

4. The apparatus according to claim 2 , wherein the operations further comprise: when the entire BSR of the apparatus to the base station has been sent, cancelling a reporting of a regular BSR.

5. The apparatus according to claim 1 , wherein the operations further comprise: when the apparatus is switched from a base station-based resource scheduling mode to an autonomous resource selection mode, cancel already triggered reporting of a BSR.

6. The apparatus according to claim 1 , wherein the BSR comprises a device to device (D2D) BSR.

7. A method for reporting a buffer status report, comprising:

receiving, by terminal device, first uplink resource scheduling information from a base station, wherein the first uplink resource scheduling information is used to indicate a first uplink resource allocated to the terminal device;

when the first uplink resource cannot carry an entire buffer status report (BSR) of the terminal device, sending, by the terminal device, a first part of the entire BSR of the terminal device to the base station on the first uplink resource, wherein the first part does not comprise the entire BSR of the terminal device;

sending, to the base station, information indicating that the entire BSR has not been sent;

based on sending the information indicating that the entire BSR has not been sent, receiving second uplink resource scheduling information from the base station, wherein the second uplink resource scheduling information is used to indicate a second uplink resource allocated to the terminal device; and

sending a second part of the entire BSR of the terminal device to the base station on the second uplink resource, wherein the second part comprises the entire BSR of the terminal device.

8. The method according to claim 7 , further comprising:

when the terminal device triggers reporting of a regular BSR and when there is no uplink resource available for sending a BSR of the terminal device,

terminal device, reporting of a scheduling request (SR), and sending a first SR to the base station.

9. The method according to claim 8 , wherein the triggering, by the terminal device, reporting of a regular BSR comprises:

when the terminal device is switched from an autonomous resource selection mode to a base station-based resource scheduling mode and there is data on a current device to device (D2D) logical channel of the terminal device to be transmitted,

triggering, by the terminal device, the reporting of a regular BSR.

10. The method according to claim 7 , comprising:

when the terminal device has sent the entire BSR of the terminal device to the base station, canceling, by the terminal device, a reporting of a regular BSR.

11. The method according to claim 7 , comprising:

when the terminal device is switched from a base station-based resource scheduling mode to an autonomous resource selection mode,

cancelling, by the terminal device, an already triggered reporting of a BSR.

12. The method according to claim 7 , wherein the BSR comprises a device to device (D2D) BSR.

13. An apparatus, comprising a processor; and a non-transitory computer-readable storage medium including computer-executable instructions executed by the processor to perform, on the apparatus, operations comprising:

sending first uplink resource scheduling information to a terminal device, wherein the first uplink resource scheduling information is used to indicate a first uplink resource allocated to the terminal device;

if the first uplink resource cannot carry an entire buffer status report (BSR) of the terminal device, receiving, from the terminal device on the first uplink resource, a first part of the entire BSR of the terminal device, wherein the first part does not comprise the entire BSR of the terminal device;

receiving, from the terminal device, information indicating that the entire BSR has not been sent;

based on receiving the information indicating that the entire BSR has not been sent, sending second uplink resource scheduling information to the terminal device, wherein the second uplink resource scheduling information is used to indicate a second uplink resource allocated to the terminal device;

receiving, from the terminal device on the second uplink resource, the entire BSR of the terminal device; and

allocating the first uplink resource and the second uplink resource to the terminal device.

14. The apparatus according to claim 13 , wherein the operations further comprise:

receiving a first scheduling request SR from the terminal device, wherein the first SR is sent after reporting of an SR is triggered when the terminal device triggers reporting of a regular BSR and when there is no uplink resource used for sending a BSR of the terminal device.

15. The apparatus according to claim 14 , wherein the BSR comprises a device to device D2D BSR.