Method and apparatus for transmitting uplink feedback information unit based on PDCP duplication state in wireless communication system

    公开(公告)号:US11595951B2

    公开(公告)日:2023-02-28

    申请号:US17356385

    申请日:2021-06-23

    Inventor: Geumsan Jo

    Abstract: The present invention relates to a method of transmitting a status report by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving information about whether a Packet Data Convergence Protocol (PDCP) duplication for downlink is activated or not; receiving at least one data unit from a network; determining whether the status report related to the at least one data unit is triggered or not; based on whether the PDCP duplication for the downlink is activated or not; and transmitting the triggered status report related to the at least one data unit, wherein, based on the PDCP duplication for the downlink being activated, the status report related to the at least one data unit is not triggered.

    Method for handling state variables of a PDCP entity in wireless communication system and a device therefor

    公开(公告)号:US10680967B2

    公开(公告)日:2020-06-09

    申请号:US16453187

    申请日:2019-06-26

    Abstract: The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for handling state variables of a PDCP entity in wireless communication system, the method comprising: delivering an PDCP SDU associated with a first COUNT to upper layer and starting, by the PDCP entity, a reordering timer, when an out-of-order PDCP PDU with the first COUNT value is received from lower layer; updating a value of a first state variable to the first COUNT value +1, when the reordering timer starts; and when the reordering timer expires, updating, by the PDCP entity, a value of a second state variable based on a second COUNT value of a first PDCP SDU which has not been delivered to upper layers, among PDCP SDUs with COUNT values which are equal to or larger than the first state variable.

    METHOD AND APPARATUS FOR PERFORMING DATA TRANSMISSION WITHOUT SEQUENCE NUMBER IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20230041726A1

    公开(公告)日:2023-02-09

    申请号:US17788870

    申请日:2021-01-13

    Abstract: The present invention relates to a method of transmitting data units by a Radio Link Control (RLC) entity of a user equipment (UE) in a Radio Resource Control (RRC) INACTIVE state in a wireless communication system. Especially, the method includes the steps of transmitting at least one first data unit without the poll in the RRC INACTIVE state to a peer RLC entity; based on a number of the at least one first data unit without the poll being equal to or greater than a threshold value, shifting to a RRC CONNECTED state; transmitting a second data unit with the poll in the RRC CONNECTED state to the peer RLC entity; and receiving a status report for the at least one first data unit without the poll and the second data unit with the poll from the peer RLC entity.

    METHOD AND APPARATUS FOR HANDLING HANDOVER FAILURE IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20220248280A1

    公开(公告)日:2022-08-04

    申请号:US17622338

    申请日:2020-10-20

    Abstract: The present invention relates to a method of performing a handover procedure by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of initializing state variables for at least one radio bearer (RB) based on receiving a handover command from a source network; performing the handover procedure to a target network while maintaining the connection with the source network; based on detecting a handover failure to the target network, reverting back the state variables for the at respectively, and applying the first network configuration least one RB to the state variables used in the source network; and reporting information related to the handover failure to the source network.

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