Channel access procedure for UL transmission
Aspects of the disclosure further provide an apparatus and a method for wireless communication. The apparatus includes processing circuitry that receives, from a base station (BS), a downlink (DL) grant scheduling an uplink (UL) transmission to the BS. The DL grant indicates a first type of channel access procedure for the UL transmission. The processing circuitry performs a channel access procedure for the UL transmission according to the first type of channel access procedure indicated by the DL grant.
1. A method of wireless communication at a user equipment (UE), the method comprising:
receiving, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS;
when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
performing a first type of channel access procedure for the UL transmission; and
when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
performing a second type of channel access procedure for the UL transmission.
2. The method of claim 1 , wherein
the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission.
3. The method of claim 1 , further comprising:
determining whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS.
4. The method of claim 1 , wherein the first type of channel access procedure and the second type of channel access procedure are the same.
5. The method of claim 2 , wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission.
6. The method of claim 5 , wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception.
7. The method of claim 1 , wherein the channel occupancy information is carried by downlink control information (DCI).
8. An apparatus, comprising processing circuitry configured to:
receive, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS;
when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
perform a first type of channel access procedure for the UL transmission; and
when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
perform a second type of channel access procedure for the UL transmission.
9. The apparatus of the claim 8 , wherein
the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission.
10. The apparatus of the claim 8 , wherein the processing circuitry is further configured to:
determine whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS.
11. The apparatus of the claim 8 , wherein the first type of channel access procedure and the second type of channel access procedure are the same.
12. The apparatus of the claim 9 , wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission.
13. The apparatus of the claim 12 , wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception.
14. The apparatus of the claim 8 , wherein the channel occupancy information is carried by downlink control information (DCI).
15. A non-transitory computer-readable storage medium storing a program executable by at least one processor to perform:
receiving, from a base station (BS), channel occupancy information indicating a duration in a time domain and a location in a frequency domain for a channel occupancy that is initiated by the BS;
when an uplink (UL) transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
performing a first type of channel access procedure for the UL transmission; and
when the UL transmission is not scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS,
performing a second type of channel access procedure for the UL transmission.
16. The non-transitory computer-readable storage medium of claim 15 , wherein
the second type of channel access procedure is indicated in a downlink (DL) grant scheduling the UL transmission.
17. The non-transitory computer-readable storage medium of claim 15 , wherein the program executable by at least one processor is further to perform:
determining whether the UL transmission is scheduled within the duration in the time domain and the location in the frequency domain for the channel occupancy that is initiated by the BS.
18. The non-transitory computer-readable storage medium of claim 15 , wherein the first type of channel access procedure and the second type of channel access procedure are the same.
19. The non-transitory computer-readable storage medium of claim 16 , wherein the DL grant schedules a DL reception and indicates a timing offset between the DL reception and the UL transmission.
20. The non-transitory computer-readable storage medium of claim 19 , wherein the UL transmission includes hybrid automatic repeat request-acknowledge (HARQ-ACK) information for the DL reception.