Downlink control information (DCI) for sidelink grant
A service device (e.g., a user equipment (UE), a new radio NR (gNB), or other network component) as a service provider/consumer can process or generate sidelink communications based on a downlink control information (DCI) for one or more sidelink configured grants that enables resource allocation for the sidelink communication. The device can determine whether to activate, release/deactivate, or request a retransmission for the one or more sidelink configured grants based on one or more fields of a DCI format 3_0 configuration of the DCI.
1. A user equipment (UE) comprising:
radio frequency (RF) circuitry;
a memory; and
processing circuitry coupled to the memory and configured to execute instructions stored in the memory to cause the UE to:
receive a physical downlink control channel (PDCCH) to activate a sidelink configured grant for a sidelink communication;
derive a hybrid automatic repeat request (HARQ) process identifier (ID) for the sidelink configured grant based on a current slot variable that is a function of a system frame number (SFN);
transmit, via the RF circuitry, the sidelink communication based on the HARQ process ID;
receive downlink control information (DCI) with DCI format 3_0 including a frequency resource assignment (FRA) field; and
in response to the FRA field of the DCI being set to all ones, processing a release operation for the sidelink configured grant.
2. The UE of claim 1 , wherein the processing circuitry is further configured to cause the UE to:
generate a retransmission operation of the sidelink configured grant based on at least one of: the HARQ process ID or a new data indicator (NDI) field corresponding to a sidelink dynamic grant.
3. The UE of claim 1 , wherein the processing circuitry is further configured to cause the UE to:
determine whether to initiate a retransmission operation for a retransmission of the sidelink configured grant based on a field of a subsequent DCI with DCI format 3_0.
4. The UE of claim 3 , wherein the field of the subsequent DCI with DCI format 3_0 is applicable to a sidelink dynamic grant, and wherein the sidelink configured grant is based on a different radio network temporary identifier (RNTI) than the sidelink dynamic grant.
5. The UE of claim 1 , wherein the processing circuitry is further configured to cause the UE to:
determine the HARQ process ID based on a representation as follows:
[floor(CURRENT_slot/sl-PeriodCG)] modulo sl-NrOfHARQ-Processes, where the CURRENT_slot as the current slot variable is equal to (SFN×numberOfSlotsPerFrame+slot number in frame).
6. The UE of claim 5 , wherein the HARQ process ID is mapped to a grant HARQ ID in a one-to-one mapping.
7. The UE of claim 6 , wherein the HARQ process ID is a sum of the grant HARQ ID and a minimum HARQ process ID for a range of HARQ process IDs.
8. The UE of claim 1 , wherein the HARQ process ID comprises a HARQ process number, and the processing circuitry is further configured to cause the UE to:
determine whether a field of a subsequent DCI with DCI format 3_0 is masked with a sidelink radio network temporary identifier (SL-RNTI); and
process an activation or release operation for the sidelink configured grant based on the determination of whether the field is masked with the SL-RNTI.
9. The UE of claim 1 , wherein the HARQ process ID comprises a HARQ process number, and the processing circuitry is further configured to cause the UE to:
determine whether the HARQ process number comprises all zeros; and
in response to the HARQ process number not comprising all zeros, release or ignore the sidelink configured grant.
10. The UE of claim 1 , wherein the HARQ process ID comprises a HARQ process number.
11. A computer readable storage device storing executable instructions that, in response to execution, cause one or more processors to perform operations comprising:
receiving a physical downlink control channel (PDCCH) to activate a sidelink configured grant for a sidelink communication;
determining a hybrid automatic repeat request (HARQ) process identifier (ID) for the sidelink configured grant based on a current slot variable;
providing the sidelink communication based on the HARQ process ID;
receiving downlink control information (DCI) with DCI format 3_0; and
determining a release of the sidelink configured grant based on a HARQ process ID field and a frequency resource assignment (FRA) field of the DCI.
12. The computer readable storage device of claim 11 , wherein the operations further comprise:
determining an activation of the sidelink configured grant based on a HARQ process ID field of a subsequent downlink control information (DCI) with DCI format 3_0.
13. The computer readable storage device of claim 11 , wherein the operations further comprise:
generating a retransmission operation of the sidelink configured grant based on at least one of: the HARQ process ID, a new data indicator (NDI) field corresponding to a sidelink dynamic grant, or a frequency resource assignment (FRA) field.
14. The computer readable storage device of claim 11 , wherein the HARQ process ID comprises a HARQ process number, and wherein the operations further comprise:
determining whether the HARQ process number comprises all zeros; and
in response to the HARQ process number not comprising all zeros, releasing or ignoring the sidelink configured grant.
15. The computer readable storage device of claim 11 , wherein the HARQ process ID comprises a HARQ process number, and wherein the operations further comprise:
determining whether a frequency resource assignment (FRA) of the sidelink configured grant is set to all ones; and
in response to the FRA being set to all ones, releasing the sidelink configured grant.
16. A baseband processor configured to, when executing instructions stored in a memory, perform operations comprising:
receiving a physical downlink control channel (PDCCH) to activate a sidelink configured grant for a sidelink communication;
determining a hybrid automatic repeat request (HARQ) process identifier (ID) for the sidelink configured grant based on a current slot variable;
providing, to a radio frequency (RF) interface for transmission, the sidelink communication based on the HARQ process ID; and
receiving downlink control information (DCI) indicating a HARQ process number; and
in response to the HARQ process number not comprising all zero s, releasing the sidelink configured grant.
17. The baseband processor of claim 16 , wherein the operations further comprise:
determining an activation of the sidelink configured grant based on a HARQ process ID field of a subsequent downlink control information (DCI) with DCI format 3_0, wherein the current slot variable is a function of a system frame number (SFN).
18. The baseband processor of claim 16 , wherein the DCI includes a HARQ process ID field indicating the HARQ process number.
19. The baseband processor of claim 16 , wherein the HARQ process ID is a HARQ process number, and wherein the operations further comprise:
determining whether a frequency resource assignment (FRA) of the sidelink configured grant is set to all ones; and
in response to the FRA being set to all ones, releasing the sidelink configured grant.