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US-12621859-B2 - User equipment and method for frame-based equipment operation in an unlicensed band

US12621859B2US 12621859 B2US12621859 B2US 12621859B2US-12621859-B2

Abstract

A UE and a method for FBE operation in an unlicensed band are provided. The method receives DCI scheduling a PUSCH and indicating that an initiator of a CO of a FFP for the scheduled PUSCH is the UE. The method initiates the CO by transmitting a configured PUSCH within the CO when a DL signal has not been detected within a second FFP before a start time of the configured PUSCH, wherein the scheduled PUSCH is immediately after the configured PUSCH. The method transmits the scheduled PUSCH within the CO after receiving the DCI. The start time of the configured PUSCH is aligned with a start time of the FFP, an end time of the configured PUSCH is before start times of idle periods of both FFPs, and the second FFP overlaps the FFP and is used when the BS operates as an initiating device for the FBE operation.

Inventors

  • Hai-Han WANG
  • Chia-Hsin Lai

Assignees

  • SHARP KABUSHIKI KAISHA

Dates

Publication Date
20260505
Application Date
20220407

Claims (9)

  1. 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. 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. 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. 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. 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. 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. 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. 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. 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.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) The present disclosure is a National Stage Application of International Patent Application Serial No. PCT/CN2022/085573, filed on Apr. 7, 2022, which claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 63/171,961, filed on Apr. 7, 2021, and U.S. Provisional Patent Application Ser. No. 63/171,953, filed on Apr. 7, 2021, the contents of all which are hereby incorporated herein fully by reference into the present disclosure for all purposes. FIELD The present disclosure is related to wireless communication, and more specifically, to a user equipment (UE) and a method for a frame-based equipment (FBE) operation in an unlicensed band in a next-generation wireless communication network. BACKGROUND With the tremendous growth in the number of connected devices and the rapid increase in user/network traffic volume, various efforts have been made to improve different aspects of wireless communication for the next-generation wireless communication system, such as the fifth-generation (5G) New Radio (NR), by improving data rate, latency, reliability, and mobility. The 5G NR system is designed to provide flexibility and configurability for optimizing the network services and types and accommodating various use cases, such as enhanced Mobile Broadband (eMBB), massive Machine-Type Communication (mMTC), and Ultra-Reliable and Low-Latency Communication (URLLC). However, as the demand for radio access continues to grow, there is a need for further improvements in wireless communication in the next-generation wireless communication system. SUMMARY The present disclosure is related to a method for an FBE operation in an unlicensed band performed by a UE. According to a first aspect of the present disclosure, a method for a frame-based equipment (FBE) operation in an unlicensed band performed by a user equipment (UE) is provided. The method includes receiving, from a base station (BS), downlink control information (DCI) scheduling a scheduled physical uplink shared channel (PUSCH) and indicating that an initiator of a channel occupancy (CO) of a fixed frame period (FFP) for the scheduled PUSCH is the UE; initiating the CO of the FFP by transmitting a configured PUSCH within the CO of the FFP to the BS 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 FFP after receiving the DCI, wherein the start time of the configured PUSCH is aligned with a start time of the FFP, an end time of the configured PUSCH is before a start time of an idle period of the FFP and a start time of an idle period of the second FFP, and the second FFP overlaps the FFP and is used when the BS operates as an initiating device for the FBE operation. According to an implementation of the first aspect, the end time of the configured PUSCH and a start time of the scheduled PUSCH are in consecutive symbols. According to an implementation of the first aspect, the method further includes determining whether a channel of the unlicensed band is clear by performing a clear channel assessment (CCA) on the channel; and transmitting the configured PUSCH on the channel after determining that the channel is clear. According to an implementation of the first aspect, the method further includes receiving, from the BS, a first parameter indicating a first periodicity and a starting offset of the FFP; and receiving, from the BS, a second parameter indicating a second periodicity of the second FFP. According to a second aspect of the present disclosure, a user equipment (UE) for a frame-based equipment (FBE) operation in an unlicensed band is provided. The UE includes one or more non-transitory computer-readable media storing one or more computer-executable instructions and at least one processor that is coupled to the one or more non-transitory computer-readable media. The at least one processor is configured to execute the one or more computer-executable instructions to cause the UE to: receive, from a base station (BS), downlink control information (DCI) scheduling a scheduled physical uplink shared channel (PUSCH) and indicating that an initiator of a channel occupancy (CO) of a fixed frame period (FFP) for the scheduled PUSCH is the UE; initiate the CO of the FFP by transmitting a configured PUSCH within the CO of the FFP to the BS 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 FFP after receiving the DCI, wherein the start time of the configured PUSCH is aligned with a start time of the FFP, an end time of the configured PUSCH is before a start time of an idle period of t