Granted Patent B2

US 12,621,859 · App. 18/282,064 · Granted May 5, 2026

Inventors: Hai-Han Wang (Taipei, TW); Chia-Hsin Lai (Taipei, TW)

Assignee: SHARP KABUSHIKI KAISHA

H04W74/006H04W72/1273H04W72/232H04W74/0808

Abstract

Claims (41)

1 . A method for performing, by a user equipment (UE), a frame-based equipment (FBE) operation in an unlicensed band, the method comprising:

receiving, from a base station (BS), downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH) and that indicates that an initiator of a channel occupancy (CO) of a first fixed frame period (FFP) for the scheduled PUSCH is the UE;

initiating the CO of the first FFP by transmitting, to the BS, a configured PUSCH within the CO of the first FFP after determining that a downlink (DL) signal has not been detected within a second FFP before a start time of the configured PUSCH, the scheduled PUSCH being immediately after the configured PUSCH; and

transmitting, to the BS, the scheduled PUSCH within the CO of the first FFP after receiving the DCI, wherein:

the start time of the configured PUSCH is aligned with a start time of the first FFP,

an end time of the configured PUSCH is before a start time of an idle period of the first FFP and a start time of an idle period of the second FFP, and

the second FFP overlaps the first FFP and is used when the BS operates as an initiating device for the FBE operation.

2 . The method of claim 1 , wherein the end time of the configured PUSCH and a start time of the scheduled PUSCH are in consecutive symbols.

3 . The method of claim 1 , further comprising:

determining whether a channel of the unlicensed band is clear by performing a clear channel assessment (CCA) on the channel, wherein

transmitting the configured PUSCH to the BS comprises transmitting the configured PUSCH on the channel after determining that the channel is clear.

4 . The method of claim 1 , further comprising:

receiving, from the BS, a first parameter indicating a first periodicity and a starting offset of the first FFP; and

receiving, from the BS, a second parameter indicating a second periodicity of the second FFP.

5 . A user equipment (UE) for performing a frame-based equipment (FBE) operation in an unlicensed band, the UE comprising:

at least one processor; and

at least one non-transitory computer-readable medium coupled to the at least one processor and storing one or more computer-executable instructions that, when executed by the at least one processor, cause the UE to:

receive, from a base station (BS), downlink control information (DCI) that schedules a physical uplink shared channel (PUSCH) and that indicates that an initiator of a channel occupancy (CO) of a first fixed frame period (FFP) for the scheduled PUSCH is the UE;

initiate the CO of the first FFP by transmitting, to the BS, a configured PUSCH within the CO of the first FFP after determining that a downlink (DL) signal has not been detected within a second FFP before a start time of the configured PUSCH, the scheduled PUSCH being immediately after the configured PUSCH; and

transmit, to the BS, the scheduled PUSCH within the CO of the first FFP after receiving the DCI, wherein:

the start time of the configured PUSCH is aligned with a start time of the first FFP,

an end time of the configured PUSCH is before a start time of an idle period of the first FFP and a start time of an idle period of the second FFP, and

the second FFP overlaps the first FFP and is used when the BS operates as an initiating device for the FBE operation.

6 . A communication system for a frame-based equipment (FBE) operation in an unlicensed band, the communication system comprising a base station (BS) and a user equipment (UE), wherein:

the BS is configured to:

set an indication indicating an initiator of a channel occupancy (CO) of a first fixed frame period (FFP) for a physical uplink shared channel (PUSCH) is the UE,

transmit, to the UE, downlink control information (DCI) to schedule the PUSCH and to indicate the indication, and

disable transmitting, to the UE, a downlink (DL) signal within a second FFP before a start time of a configured PUSCH, and

the UE is configured to:

initiate the CO of the first FFP by transmitting, to the BS, the configured PUSCH within the CO of the first FFP after determining that the DL signal has not been detected within the second FFP before the start time of the configured PUSCH, the scheduled PUSCH being immediately after the configured PUSCH, and

transmit, to the BS, the scheduled PUSCH within the CO of the first FFP after receiving the DCI, wherein:

the start time of the configured PUSCH is aligned with a start time of the first FFP,

an end time of the configured PUSCH is before a start time of an idle period of the first FFP and a start time of an idle period of the second FFP, and

the second FFP overlaps the first FFP and is used when the BS operates as an initiating device for the FBE operation.

7 . The communication system of claim 6 , wherein the end time of the configured PUSCH and a start time of the scheduled PUSCH are in consecutive symbols.

8 . The communication system of claim 6 , wherein the UE is further configured to:

determine whether a channel of the unlicensed band is clear by performing a clear channel assessment (CCA) on the channel, wherein

transmitting the configured PUSCH to the BS comprises transmitting the configured PUSCH on the channel after determining that the channel is clear.

9 . The communication system of claim 6 , wherein the BS is further configured to:

transmit, to the UE, a first parameter indicating a first periodicity and a starting offset of the first FFP, and

transmit, to the UE, a second parameter indicating a second periodicity of the second FFP.

Assignments (2)

Continuity (3)

References Cited (21)