Cross-layer quality of service (QoS) indication for sidelink communications

1. One or more non-transitory computer-readable media (NTCRM) comprising instructions, wherein execution of the instructions by one or more processors cause a user equipment (UE) to:

when a medium access control (MAC) protocol data unit (PDU) with data from one or more logical channels (LCHs) has been obtained for a sidelink transmission, identify a four-bit LCH priority of the MAC PDU as a priority value of a highest priority LCH among the one or more LCHs, wherein the four-bit LCH priority is one of a plurality of four-bit LCH priorities;

identify, based on a 2:1 mapping of the plurality of four-bit LCH priorities to a plurality of three-bit sidelink control information (SCI) priorities, a three-bit SCI priority of the plurality of three-bit SCI priorities of the MAC PDU, wherein the 2:1 mapping is a mapping of two of the plurality of four-bit LCH priorities to a single one of the plurality of three-bit SCI priorities;

when hybrid automatic repeat request (HARQ) feedback is enabled for groupcast, and when negative-only acknowledgement is to be used for the HARQ feedback, set a communication range requirement to be a longest communication range of the one or more LCHs in the MAC PDU; and

cause the sidelink transmission of the MAC PDU based on the set communication range requirement and the identified SCI priority of the MAC PDU.

2. The one or more NTCRM of claim 1 , wherein the MAC PDU is to be transmitted on a sidelink channel.

3. The one or more NTCRM of claim 1 , wherein, to cause the sidelink transmission of the MAC PDU, the execution of the instructions is to cause the UE to instruct a physical layer entity to generate the sidelink transmission including the MAC PDU.

4. The one or more NTCRM of claim 1 , wherein the execution of the instructions is to cause the UE to map the data from the MAC PDU to one or more transport blocks for the sidelink transmission.

5. The one or more NTCRM of claim 1 , wherein the UE is a vehicle-to-everything (V2X) UE.

6. One or more non-transitory computer-readable media (NTCRM) comprising instructions of a sidelink hybrid automatic repeat request (HARQ) entity, wherein execution of the instructions by one or more processors is to cause a user equipment (UE) to:

when a medium access control (MAC) protocol data unit (PDU) with data from one or more logical channels (LCHs) has been obtained for sidelink transmission, identify a four-bit LCH priority of the MAC PDU of a plurality of four-bit LCH priorities;

set the identified four-bit LCH priority as a priority value of a highest priority LCH among the one or more LCHs;

identify, based on a 2:1 mapping of the plurality of four-bit LCH priorities to a plurality of three-bit sidelink control information (SCI) priorities, a three-bit SCI priority of the plurality of three-bit SCI priorities of the MAC PDU, wherein the 2:1 mapping is a mapping of two of the plurality of four-bit LCH priorities to a single one of the plurality of three-bit SCI priorities;

when HARQ feedback is enabled for groupcast, and when negative-only acknowledgement is to be used for the HARQ feedback, set a communication range requirement to be a longest communication range of the LCHs in the MAC PDU; and

provide the MAC PDU to an associated sidelink process for transmission of the MAC PDU according to the communication range requirement and the identified SCI priority of the MAC PDU.

7. The one or more NTCRM of claim 6 , wherein the execution of the instructions is to cause the UE to instruct the associated sidelink process to trigger a transmission.

8. The one or more NTCRM of claim 7 , wherein the associated sidelink process, when instructed to trigger the transmission, is to instruct a physical layer to generate the sidelink transmission including the MAC PDU.

9. The one or more NTCRM of claim 6 , wherein the sidelink HARQ entity and the associated sidelink process are part of a MAC layer implemented by the UE.

10. The one or more NTCRM of claim 6 , wherein the UE is a vehicle-to-everything (V2X) UE.

11. A user equipment (UE) comprising:

baseband circuitry connected to radiofrequency (RF) circuitry, wherein the baseband circuitry is to:

when a medium access control (MAC) protocol data unit (PDU) with data from one or more logical channels (LCHs) has been obtained for sidelink transmission, set identify a four-bit LCH priority of the MAC PDU as a priority value of a highest priority LCH among the one or more LCHs;

identify a 2:1 mapping of a plurality of four-bit LCH priorities to a plurality of three-bit sidelink control information (SCI) priorities, wherein the 2:1 mapping is a mapping of two of the plurality of four-bit LCH priorities to a single one of the plurality of three-bit SCI priorities; identify, based on the mapping and the identified four-bit LCH priority, an SCI priority of the plurality of three-bit SCI priorities of the MAC PDU;

when hybrid automatic repeat request (HARQ) feedback is enabled for groupcast, and when negative-only acknowledgement is to be used for the HARQ feedback, set a communication range requirement to be a longest communication range of the one or more LCHs in the MAC PDU; and

provide the MAC PDU to a physical layer entity for transmission; and

radiofrequency (RF) circuitry connected to the baseband circuitry, wherein the RF circuitry is to transmit the MAC PDU over a sidelink channel based on the set communication range requirement and the identified SCI priority of the MAC PDU.

12. The UE of claim 11 , wherein the baseband circuitry is to map the data from the MAC PDU to one or more transport blocks for the sidelink transmission.

13. The UE of claim 11 , wherein the baseband circuitry is to map the highest priority LCH to a sidelink control information (SCI) priority field in a linear and non-overlapping manner.

14. The UE of claim 11 , wherein the UE is a vehicle-to-everything (V2X) UE.