Configured grant operation for new radio unlicensed spectrum carrier aggregation
Configured grant operations for new radio (NR) unlicensed spectrum (NR-U) carrier aggregation (CA) are disclosed. In an aspect, a method of wireless communication by a user equipment (UE) may include transmitting uplink (UL) data to a base station according to a configured grant configuration. The method may also include determining a carrier to receive feedback from the base station based on the configured grant configuration. The method may further include receiving feedback from the base station on the carrier in response to the transmitting of the UL data.
1. A method of wireless communication by a user equipment (UE), comprising:
receiving, from a base station, a configured grant configuration for a carrier aggregation mode, the configuration grant configuration configuring the UE for autonomous UL data transmissions over multiple carriers, without an explicit UL grant;
transmitting uplink (UL) data over resources with the multiple carriers according to the configured grant configuration; and
receiving downlink (DL) control information (DCI) on resources associated with a carrier of the multiple carriers, the DCI comprising feedback for the UL data, via a first option where the feedback is for the carrier or via a second option where the feedback is for a second carrier of the multiple carriers,
via the first option or via the second option being based on a field in the DCI.
2. The method of claim 1 , wherein
the carrier to receive the feedback includes the at least one carrier in an unlicensed frequency spectrum used in the transmitting of the UL data.
3. The method of claim 1 , wherein
the carrier to receive the feedback includes a licensed carrier in a licensed frequency spectrum.
4. The method of claim 1 , wherein
the carrier to receive the feedback includes a primary carrier for a subband listen-before-talk (LBT).
5. The method of claim 1 , wherein
the carrier to receive the feedback includes one or more of any carrier corresponding to the base station.
6. The method of claim 1 , the first or the second option being further based on the configured grant configuration.
7. A user equipment (UE), comprising:
a memory storing instructions; and
one or more processors communicatively coupled with the memory and configured to:
receive, from a base station, a configured grant configuration for a carrier aggregation mode, the configuration grant configuration configuring the UE for autonomous UL data transmissions over multiple carriers, without an explicit UL grant;
transmit uplink (UL) data over resources associated with the multiple carriers according to the configured grant configuration; and
receive downlink (DL) control information (DCI) on resources associated with a carrier of the multiple carriers, the DCI comprising feedback for the UL data, via a first option where the feedback is for the carrier or via a second option where the feedback is for a second carrier of the multiple carriers,
via the first option or via the second option being based on a field in the DCI.
8. The UE of claim 7 , the first or the second option being further based on the configured grant configuration.
9. The UE of claim 7 , wherein
the carrier to receive the feedback includes the at least one carrier in an unlicensed frequency spectrum used by the processor to transmit the UL data.
10. The UE of claim 7 , wherein
the carrier to receive the feedback includes a licensed carrier in a licensed frequency spectrum.
11. The UE of claim 7 , wherein
the carrier to receive the feedback includes a subband listen-before-talk (LBT).
12. The UE of claim 7 , wherein
the carrier to receive the feedback includes one or more of any carrier corresponding to the base station.
13. A base station, comprising:
a memory storing instructions; and
one or more processors communicatively coupled with the memory and configured to:
transmit, to a user equipment (UE), a configured grant configuration for a carrier aggregation mode, the configured grant configuration configuring the UE for autonomous UL data transmissions over multiple carriers, without an explicit UL grant;
receive uplink (UL) data from the UE over resources associated with the multiple carriers according to the configuration grant configuration; and
transmit downlink (DL) control information (DCI) to the UE on resources associated with a carrier of the multiple carriers, the DCI comprising feedback for the UL data, via a first option where the feedback is for the carrier or via a second option where the feedback is for a second carrier of the multiple carriers,
via the first option or via the second option being indicated by a field of the DCI.
14. The base station of claim 13 , the first or the second option being further based on the configured grant configuration.
15. The base station of claim 13 , wherein
the carrier to transmit the feedback includes the at least one carrier in an unlicensed frequency spectrum used by the processor to receive the UL data.
16. The base station of claim 13 , wherein the carrier to transmit the feedback includes a licensed carrier in a licensed frequency spectrum.
17. The base station of claim 13 , wherein
the carrier to transmit the feedback includes a primary carrier for a subband listen-before-talk (LBT).
18. The base station of claim 13 , wherein
the carrier to transmit the feedback includes one or more of any carrier corresponding to the base station.