Methods for SL SR/BSR handling
The embodiments herein relate to methods for SL SR/BSR handling. In one embodiment, there proposes a method in a wireless device, comprising: triggering a Sidelink (SL) Buffer Status Report (BSR) in response to data to be sent over the SL; triggering a Sidelink (SL) Scheduling Request (SR) for transmitting the SL BSR, wherein the SL BSR is intended to be transmitted by using a first uplink (UL) grant triggered by the SL SR; and cancelling the SL SR transmission if the SL BSR has been transmitted by using a second UL grant triggered by other sources. With embodiments herein, the LCP can be adapted based on QoS requirement and unsuitable cancel of sidelink BSR can be avoided, which improves performance of both UL and sidelink.
1. A method in a wireless device, comprising:
triggering a Sidelink (SL) Buffer Status Report (BSR) in response to availability of data to be sent over the SL;
triggering a SL Scheduling Request (SR) to obtain a first uplink (UL) grant for transmitting the SL BSR; and
cancelling the SL SR transmission in response to transmitting the SL BSR using a second UL grant triggered by a Uu SR triggered by a Uu BSR, the Uu BSR being triggered by availability of data to be sent over the Uu interface.
2. The method according to claim 1 , further comprising transmitting the SL BSR and the Uu BSR together using the second UL grant triggered by the Uu SR.
3. The method according to claim 1 , further comprising:
determining Logical Channel Prioritization (LCP) for at least one of the Uu BSR and the SL BSR; and
transmitting at least one of the Uu BSR or the SL BSR according to the determined LCP.
4. The method according to claim 3 , wherein the LCP is determined based on a Quality of Service (QoS) requirement of the Uu BSR and the SL BSR, wherein the QoS requirement includes at least one of a priority requirement or a latency requirement.
5. The method according to claim 4 , wherein the QoS requirement of the Uu BSR is a highest QoS requirement of logical channels included in the Uu BSR, and the QoS requirement of the SL BSR is a highest QoS requirement of logical channels included in the SL BSR.
6. The method according to claim 4 , wherein the SL BSR is prioritized over the Uu BSR if the QoS requirement of the SL BSR is higher than the QoS requirement of the Uu BSR.
7. The method according to claim 4 , wherein one of the following applies:
the SL BSR is prioritized over the Uu BSR if the QoS requirement of the SL BSR is higher than a threshold; or
the Uu BSR is prioritized over the SL BSR if the QoS requirement of the Uu BSR is higher than a threshold.
8. The method according to claim 7 , wherein the threshold is preconfigured or configured by a network node via common or dedicated signalling.
9. The method according to claim 1 , wherein the SL BSR and the Uu BSR are transmitted together using the second UL grant triggered by the Uu SR.
10. A wireless device, comprising:
at least one processor; and
a non-transitory computer readable medium coupled to the at least one processor, the non-transitory computer readable medium contains instructions executable by the at least one processor, whereby the at least one processor is configured to:
trigger a Sidelink (SL) Buffer Status Report (BSR) in response to availability of data to be sent over the SL;
trigger a Sidelink (SL) Scheduling Request (SR) to obtain a first uplink (UL) grant for transmitting the SL BSR; and
cancel the SL SR transmission in response to transmitting SL BSR using a second UL grant triggered by a Uu SR triggered by a Uu BSR, the Uu BSR being triggered by availability of data to be sent over the Uu interface.
11. The wireless device according to claim 10 , wherein the at least one processor is further configured to transmit the SL BSR and the Uu BSR together using the second UL grant triggered by the Uu SR.
12. The wireless device according to claim 10 , wherein the at least one processor is further configured to:
determine Logical Channel Prioritization (LCP) for at least one of the Uu BSR and the SL BSR; and
transmit at least one of the Uu BSR or the SL BSR according to the determined LCP.
13. The wireless device according to claim 12 , wherein the LCP is determined based on a Quality of Service (QoS) requirement of the Uu BSR and the SL BSR, wherein the QoS requirement includes at least one of a priority requirement or a latency requirement.
14. The wireless device according to claim 13 , wherein the QoS requirement of the Uu BSR is a highest QoS requirement of logical channels included in the Uu BSR, and the QoS requirement of the SL BSR is a highest QoS requirement of logical channels included in the SL BSR.
15. The wireless device according to claim 13 , wherein the SL BSR is prioritized over the Uu BSR if the QoS requirement of the SL BSR is higher than the QoS requirement of the Uu BSR.
16. The wireless device according to claim 13 , wherein one of the following applies:
the SL BSR is prioritized over the Uu BSR if the QoS requirement of the SL BSR is higher than a threshold; or
the Uu BSR is prioritized over the SL BSR if the QoS requirement of the Uu BSR is higher than a threshold.
17. The wireless device according to claim 16 , wherein the threshold is preconfigured or configured by a network node via common or dedicated signalling.
18. The wireless device according to claim 10 , wherein the SL BSR and the Uu BSR are transmitted together using the second UL grant triggered by the Uu SR.
19. A non-transitory, computer readable medium storing computer readable code, which when executed by at least one processor of an apparatus, causes the at least one processor to:
trigger a Sidelink (SL) Buffer Status Report (BSR) in response to availability of data to be sent over the SL;
trigger a Sidelink (SL) Scheduling Request (SR) to obtain a first uplink (UL) grant for transmitting the SL BSR; and
cancel the SL SR transmission in response to transmitting SL BSR using a second UL grant triggered by a Uu SR triggered by a Uu BSR, the Uu BSR being triggered by availability of data to be sent over the Uu interface.