COT sharing procedure for configured grants in NR systems operating on unlicensed spectrum
Systems, apparatuses, methods, and computer-readable media are provided for a wireless communication system in an unlicensed spectrum. A user equipment (UE) device of the wireless communication system includes a processor circuitry and radio front end circuitry. The processor circuitry is configured to acquire a channel occupancy time (COT) in the unlicensed spectrum, and determine a number of remaining consecutive subframes allocated for physical uplink shared channel (PUSCH) transmission to a base station. The processor circuitry is configured to generate uplink control information (UCI) to indicate a COT sharing boundary occurring at an end of the remaining consecutive subframes. The radio front end circuitry is coupled to the processor circuitry and configured to transmit the UCI in the PUSCH) transmission during one of the remaining consecutive subframes. The processor circuitry is also configured to monitor downlink transmissions from the base station following the COT sharing boundary.
1. A user equipment (UE), comprising:
processor circuitry configured to:
acquire a channel occupancy time (COT) in an unlicensed spectrum;
determine the UE is a configured grant UE and further determine a number of consecutive subframes allocated for a physical uplink shared channel (PUSCH) transmission to a base station according to a time domain configuration for the configured grant UE;
determine a number of remaining consecutive subframes of the number of consecutive subframes allocated for the PUSCH transmission to the base station; and
generate uplink control information (UCI) to indicate a COT sharing boundary, the COT sharing boundary occurring at an end of the remaining consecutive subframes, the UCI further indicating a slot for monitoring for physical downlink control channel (PDCCH) transmission; and
radio front end circuitry, coupled to the processor circuitry, configured to:
transmit the UCI in the PUSCH transmission during one of the remaining consecutive subframes, wherein the PUSCH transmission and the UCI are transmitted in a same slot; and
the processor circuitry is further configured to:
monitor downlink transmissions from the base station following the COT sharing boundary.
2. The UE of claim 1 , wherein the radio front end circuitry is further configured to transmit the UCI in more than one of the remaining consecutive subframes.
3. The UE of claim 1 , wherein the UCI includes a COT sharing offset indication using a plurality of bits, wherein the COT sharing offset indication indicates the number of remaining consecutive subframes.
4. The UE of claim 1 , wherein the UCI includes a COT sharing offset indication in a single bit field, wherein a value assigned to the single bit field indicates no COT sharing, or COT sharing starting from a predetermined number of slots from a slot including the UCI.
5. The UE of claim 4 , wherein the predetermined number of slots are configured by radio resource control (RRC) signaling.
6. The UE of claim 1 , wherein the processor circuitry is further configured to generate the UCI to indicate a slot for monitoring for a physical downlink control channel (PDCCH) transmission that comprises downlink feedback information (DFI) that corresponds with PUSCH transmission in a slot including the UCI, wherein the slot for monitoring represents an offset from the slot including the UCI.
7. The UE of claim 1 , wherein the processor circuitry is further configured to allow a plurality of uplink-downlink (UL-DL) switching points within the acquired COT using the UCI to indicate the COT sharing boundary.
8. A method, comprising:
acquiring, by a user equipment (UE), a channel occupancy time (COT) in an unlicensed spectrum;
determining the UE is a configured grant UE and further determine a number of consecutive subframes allocated for a physical uplink shared channel (PUSCH) transmission to a base station according to a time domain configuration for the configured grant UE;
determining, at the UE, a number of remaining consecutive subframes of the number of consecutive subframes allocated for the PUSCH transmission to the base station;
generating, at the UE, uplink control information (UCI) to indicate a COT sharing boundary, the COT sharing boundary occurring at an end of the remaining consecutive subframes, the UCI further indicating a slot for monitoring for physical downlink control channel (PDCCH) transmission;
transmitting, from the UE to the base station, the UCI in the PUSCH transmission during one of the remaining consecutive subframes, wherein the PUSCH transmission and the UCI are transmitted in a same slot; and
monitoring, at the UE, downlink transmissions from the base station following the COT sharing boundary.
9. The method of claim 8 , further comprising transmitting, from the UE to the base station, the UCI in more than one of the remaining consecutive subframes.
10. The method of claim 8 , wherein the UCI includes a COT sharing offset indication using a plurality of bits, wherein the COT sharing offset indication indicates the number of remaining consecutive subframes.
11. The method of claim 8 , wherein the UCI includes a COT sharing offset indication in a single bit field, wherein a value assigned to the single bit field indicates no COT sharing, or COT sharing starting from a predetermined number of slots from a slot including the UCI.
12. The method of claim 11 , wherein the predetermined number of slots are configured by radio resource control (RRC) signaling.
13. The method of claim 8 , further comprising generating, at the UE, the UCI to indicate a slot for monitoring for the physical downlink control channel (PDCCH) transmission that comprises downlink feedback information (DFI) that corresponds with PUSCH transmission in a slot including the UCI, wherein the slot for monitoring represents an offset from the slot including the UCI.
14. The method of claim 8 , further comprising allowing a plurality of uplink-downlink (UL-DL) switching points within the acquired COT using the UCI to indicate the COT sharing boundary.
15. A non-transitory computer-readable medium having instructions stored thereon that, when executed by one or more processors of a user equipment (UE), cause the UE to:
acquire a channel occupancy time (COT) in an unlicensed spectrum;
determine the UE is a configured grant UE and further determine a number of consecutive subframes allocated for a physical uplink shared channel (PUSCH) transmission to a base station according to a time domain configuration for the configured grant UE;
determine a number of remaining consecutive subframes of the number of consecutive subframes allocated for the PUSCH transmission to the base station;
generate uplink control information (UCI) to indicate a COT sharing boundary, the COT sharing boundary occurring at an end of the remaining consecutive subframes, the UCI further indicating a slot for monitoring for physical downlink control channel (PDCCH) transmission;
transmit the UCI in the PUSCH transmission during one of the remaining consecutive subframes, wherein the PUSCH transmission and the UCI are transmitted in a same slot; and
monitor downlink transmissions from the base station following the COT sharing boundary.
16. The non-transitory computer-readable medium of claim 15 , wherein, upon execution, the computer instructions further cause the UE to transmit the UCI in more than one of the remaining consecutive subframes.
17. The non-transitory computer-readable medium of claim 15 , wherein the UCI includes a COT sharing offset indication using a plurality of bits, wherein the COT sharing offset indication indicates the number of remaining consecutive subframes.
18. The non-transitory computer-readable medium of claim 15 , wherein the UCI includes a COT sharing offset indication in a single bit field, wherein a value assigned to the single bit field indicates no COT sharing, or COT sharing starting from a predetermined number of slots from a slot including the UCI, and wherein the predetermined number of slots are fixed or configured by radio resource control (RRC) signaling.
19. The non-transitory computer-readable medium of claim 15 , wherein, upon execution, the computer instructions further cause UE to generate the uplink control information (UCI) to indicate a slot for monitoring for the physical downlink control channel (PDCCH) transmission that comprises downlink feedback information (DFI) that corresponds with PUSCH transmission in a slot including the UCI, wherein the slot for monitoring represents an offset from the slot including the UCI.
20. The non-transitory computer-readable medium of claim 15 , wherein, upon execution, the computer instructions further cause UE to allow a plurality of uplink-downlink (UL-DL) switching points within the acquired COT using the UCI to indicate the COT sharing boundary.