Base station operations during a UE-initiated channel access procedure
A base station (BS) configures a user equipment (UE) with parameters for channel access operations on a shared channel. The BS transmits to the UE a first configuration for a BS-initiated fixed frame period (FFP) (BS-FFP) and a second configuration for a UE-initiated FFP (UE-FFP), wherein the BS-FFP overlaps the UE-FFP, schedules an uplink (UL) transmission during the UE-FFP and when there is no downlink (DL) transmission in the BS-FFP, receiving the UL transmission from the UE during the BS-FFP.
1. A base station (BS), comprising:
a transceiver configured to connect to a user equipment (UE) over a shared channel subject to channel access operations; and
one or more processors communicatively coupled to the transceiver and configured to perform operations comprising:
generating, for transmission to the UE, a first configuration for a BS-initiated fixed frame period (FFP) (BS-FFP) and a second configuration for a UE-initiated FFP (UE-FFP), wherein the BS-FFP overlaps the UE-FFP;
generating, for transmission to the UE, downlink control information (DCI) scheduling an uplink (UL) transmission during the UE-FFP;
when there is no downlink (DL) transmission in the BS-FFP, receiving the UL transmission from the UE during the BS-FFP; and
receiving, from the UE, a row index of a table, wherein the BS includes the table and the row index of the table indicates a number of slots for sharing, an offset indicating where the UL transmission starts, and a priority for the UL transmission.
2. The BS of claim 1 , wherein the operations further comprise:
performing a channel access operation in an idle period of a BS-FFP immediately preceding the BS-FFP, wherein the channel access operation fails.
3. The BS of claim 2 , wherein the BS channel access operation includes a frame-based equipment (FBE) listen before talk (LBT) operation (BS FBE).
4. The BS of claim 1 , wherein the operations further comprise:
scheduling one of a physical downlink control channel (PDCCH), a synchronization signal block (SSB) or a periodic channel status indicator reference signal (CSI-RS) for the UE during the BS-FFP.
5. The BS of claim 1 , wherein the operations further comprise:
configuring a priority value threshold for UL transmissions, wherein the UE performs UL transmissions based on at least the priority value threshold.
6. The BS of claim 5 , wherein the UL transmission comprises a downlink control information (DCI)-granted physical uplink shared channel (PUSCH) (DG-PUSCH) and wherein the operations further comprise:
indicating a priority of the UL transmission via DCI.
7. The BS of claim 5 , wherein the UL transmission comprises a configured grant (CG) physical uplink shared channel (CG-PUSCH) and wherein the operations further comprise:
indicating a priority of the UL transmission via the CG.
8. The BS of claim 7 , wherein the priority is based on at least a Quality of Service (QoS) of flows multiplexed in the UL transmission.
9. The BS of claim 1 , wherein the operations further comprise:
determining whether the UE-FFP is to be shared with the BS based on at least receiving the UL transmission.
10. The BS of claim 1 , wherein the operations further comprise:
receiving, from the UE, uplink control information (UCI) including an indication of whether the UE-FFP is to be shared with the BS.
11. A baseband processor configured to perform operations comprising:
generating, for transmission to a user equipment (UE), a first configuration for a base station (BS)-initiated fixed frame period (BS-FFP) and a second configuration for a UE-initiated FFP (UE-FFP), wherein the BS-FFP overlaps the UE-FFP;
generating, for transmission to the UE, downlink control information (DCI) scheduling an uplink (UL) transmission during the UE-FFP;
when there is no downlink (DL) transmission in the BS-FFP, receiving the UL transmission from the UE during the BS-FFP;
receiving, from the UE, a row index of a table, wherein the BS includes the table and the row index of the table indicates a number of slots for sharing, an offset indicating where the UL transmission starts, and a priority for the UL transmission.
12. The baseband processor of claim 11 , wherein the operations further comprise:
performing a channel access operation in an idle period of a BS-FFP immediately preceding the BS-FFP, wherein the channel access operation fails.
13. The baseband processor of claim 11 , wherein the operations further comprise:
scheduling one of a physical downlink control channel (PDCCH), a synchronization signal block (SSB) or a periodic channel status indicator reference signal (CSI-RS) for the UE during the BS-FFP.
14. The baseband processor of claim 11 , wherein the operations further comprise:
configuring a priority value threshold for UL transmissions, wherein the UE performs UL transmissions based on at least the priority value threshold.
15. The baseband processor of claim 14 , wherein the UL transmission comprises a downlink control information (DCI)-granted physical uplink shared channel (PUSCH) (DG-PUSCH), wherein the operations further comprise:
indicating a priority of the UL transmission via DCI.
16. The baseband processor of claim 14 , wherein the UL transmission comprises a configured grant (CG) physical uplink shared channel (CG-PUSCH) and wherein the operations further comprise:
indicating a priority of the UL transmission via the CG, wherein the priority is based on at least a Quality of Service (QoS) of flows multiplexed in the UL transmission.
17. The baseband processor of claim 11 , wherein the operations further comprise:
determining whether the UE-FFP is to be shared with the BS based on at least receiving the UL transmission.
18. The baseband processor of claim 11 , wherein the operations further comprise:
receiving, from the UE, uplink control information (UCI) including an indication of whether the UE-FFP is to be shared with the BS.