Method and device for performing configured grant-based small data transmission
A method for a UE for performing a CG-SDT is provided. The method includes receiving a CG-SDT-specific RSRP threshold from a BS, the CG-SDT-specific RSRP threshold being configured to the UE for an SSB selection for the CG-SDT; in a case that one or more SSBs with RSRPs above the CG-SDT-specific RSRP threshold are available, performing the SSB selection to determine a first SSB index from one or more SSB indices of the one or more SSBs; and performing an initial transmission of the CG-SDT or a subsequent new transmission of the CG-SDT through a first UL grant corresponding to the first SSB index.
1. A method for a User Equipment (UE) for performing a Configured Grant (CG)-based Small Data Transmission (CG-SDT), the method comprising:
receiving a CG-SDT-specific Reference Signal Received Power (RSRP) threshold from a Base Station (BS), the CG-SDT-specific RSRP threshold being configured to the UE for a Synchronization Signal Block (SSB) selection for the CG-SDT;
in a case that one or more SSBs with RSRPs above the CG-SDT-specific RSRP threshold are available, performing the SSB selection to determine a first SSB index from one or more SSB indices of the one or more SSBs; and
performing an initial transmission of the CG-SDT or a subsequent new transmission of the CG-SDT through a first Uplink (UL) grant corresponding to the first SSB index.
2. The method of claim 1 , further comprising:
indicating, by a higher layer of the UE, the first SSB index to a lower layer of the UE after determining the first SSB index.
3. The method of claim 1 , further comprising:
determining, during the SSB selection, a second SSB index for a retransmission of the initial transmission, the second SSB index having a same value as the first SSB index.
4. The method of claim 3 , further comprising:
indicating, by a higher layer of the UE, the second SSB index to a lower layer of the UE after determining the second SSB index.
5. The method of claim 1 , wherein performing the SSB selection comprises performing the SSB selection after determining that a configuration for the CG-SDT is configured.
6. The method of claim 1 , wherein performing the SSB selection comprises performing the SSB selection after determining that a Timing Advance (TA) for the CG-SDT is valid.
7. The method of claim 1 , wherein the one or more SSBs are configured for the CG-SDT.
8. The method of claim 1 , wherein the CG-specific RSRP threshold is configured through a Small Data Transmission (SDT)-specific CG configuration.
9. The method of claim 8 , wherein the SDT-specific CG configuration is configured through a Small Data Transmission (SDT) configuration.
10. The method of claim 9 , wherein the SDT configuration is configured through a Radio Resource Control (RRC) release message.
11. A User Equipment (UE) for performing a Configured Grant (CG)-based Small Data Transmission (CG-SDT), the UE comprising:
transmission and reception circuitry; and
at least one processor coupled to the transmission and reception circuitry and configured to:
receive, by the transmission and reception circuitry, a CG-SDT-specific Reference Signal Received Power (RSRP) threshold from a Base Station (BS), the CG-SDT-specific RSRP threshold being configured to the UE for a Synchronization Signal Block (SSB) selection for the CG-SDT;
in a case that one or more SSBs with RSRPs above the CG-SDT-specific RSRP threshold are available, perform the SSB selection to determine a first SSB index from one or more SSB indices of the one or more SSBs; and
perform an initial transmission of the CG-SDT or a subsequent new transmission of the CG-SDT through a first Uplink (UL) grant corresponding to the first SSB index.
12. The UE of claim 11 , wherein the at least one processor is further configured to:
indicate, by a higher layer of the UE, the first SSB index to a lower layer of the UE after the UE determines the first SSB index.
13. The UE of claim 11 , wherein the at least one processor is further configured to:
determine, during the SSB selection, a second SSB index for a retransmission of the initial transmission, the second SSB index having a same value as the first SSB index.
14. The UE of claim 13 , wherein the at least one processor is further configured to:
indicate, by a higher layer of the UE, the second SSB index to a lower layer of the UE after determining the second SSB index.
15. The UE of claim 11 , wherein performing the SSB selection comprises performing the SSB selection after determining that a configuration for the CG-SDT is configured.
16. The UE of claim 11 , wherein performing the SSB selection comprises performing the SSB selection after determining that a Timing Advance (TA) for the CG-SDT is valid.
17. The UE of claim 11 , wherein the one or more SSBs are configured for the CG-SDT.
18. The UE of claim 11 , wherein the CG-specific RSRP threshold is configured through a Small Data Transmission (SDT)-specific CG configuration.
19. The UE of claim 18 , wherein the SDT-specific CG configuration is configured through a Small Data Transmission (SDT) configuration.
20. The UE of claim 19 , wherein the SDT configuration is configured through a Radio Resource Control (RRC) release message.