METHOD AND APPARATUS FOR HANDLING RADIO LINK FAILURE IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20220217806A1

    公开(公告)日:2022-07-07

    申请号:US17594719

    申请日:2020-06-03

    Abstract: The present disclosure relates to a method of handling radio link failure (RLF) by a user equipment (UE) in a wireless communication system. In particular, the UE is configured with first and second medium access control (MAC) entities, the first MAC entity is associated with a first node, and the second MAC entity is associated with the second node. The method comprises detecting the RLF related to the first node; and transmitting a RLF recovery request message to the second node, wherein the RLF recovery request message includes a COUNT value related to a signaling radio bearer (SRB).

    METHOD AND APPARATUS FOR CHANGING PDCP VERSION

    公开(公告)号:US20210136584A1

    公开(公告)日:2021-05-06

    申请号:US16638661

    申请日:2018-10-11

    Abstract: Provided is a method for changing, by a user equipment (UE), packet data convergence protocol (PDCP) version. The method may include: receiving a security mode command message, which includes a first security algorithm configuration for a PDCP of a first system and a second security algorithm configuration for a PDCP of a second system, from a base station (BS); deriving a first security key for the PDCP of the first system, based on the first security algorithm configuration; when the security mode command message passes an integrity protection check based on the first security key, changing the PDCP version from the PDCP of the first system to the PDCP of the second system; deriving a second security key for the PDCP of the second system, based on the second security algorithm configuration; and transmitting a security mode complete message, based on the second security key, to the BS.

    METHOD AND APPARATUS FOR PERFORMING PDCP SDU CONCATENATION OPERATION IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20240364799A1

    公开(公告)日:2024-10-31

    申请号:US18688468

    申请日:2022-09-19

    Inventor: Geumsan JO

    CPC classification number: H04L69/28 H04L69/321 H04L69/324 H04W80/02

    Abstract: The present disclosure relates to a method of communicating via paired serving cells by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving a first Packet Data Convergence Protocol (PDCP) service data unit (SDU) from an upper layer, wherein a concatenation timer is started upon the first PDCP SDU is received based on the concatenation timer not being running; receiving a second PDCP SDU from the upper layer; generating a PDCP protocol data unit (PDU) including the first PDCP SDU and the second PDCP SDU, based on the concatenation timer being running; applying ciphering to the PDCP PDU; and submitting the PDCP PDU to a lower layer, wherein the concatenation timer is stopped upon the PDCP PDU is submitted to the lower layer.

    METHOD AND APPARATUS FOR RECEIVING MULTICAST DATA BASED ON DRX OPERATIONS IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20240333438A1

    公开(公告)日:2024-10-03

    申请号:US18575697

    申请日:2022-08-04

    CPC classification number: H04L1/188 H04W76/28

    Abstract: The present disclosure relates to a method of receiving data units by a user equipment (UE) in a wireless communication system. In particular, the method includes the steps of: receiving the data unit during an active time of a first discontinuous reception (DRX) configuration related to a multicast transmission for a Hybrid Automatic Repeat and request (HARQ) process; transmitting a negative response to the network based on the data unit being not successfully decoded; starting a HARQ Round-trip Time (RTT) timer of a second DRX configuration related to a unicast transmission for the HARQ process; and monitoring a physical downlink control channel (PDCCH) related to a retransmitted data unit during an active time of the second DRX configuration, based on the HARQ RTT timer expiring

    METHOD AND APPARATUS FOR TRANSMITTING DATA UNIT BASED ON CONFIGURED GRANT BY UE IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20240292381A1

    公开(公告)日:2024-08-29

    申请号:US18569502

    申请日:2022-07-12

    CPC classification number: H04W72/04

    Abstract: The present invention relates to a method for transmitting multiple data units by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving information related to at least one configured grant, wherein each of the at least one configured grant comprises a plurality of configured grant occasions; selecting at least one configured grant occasion within a predetermined duration when the multiple data units to be transmitted becomes available, among the plurality of configured grant occasions belonging to the least one configured grant; and transmitting the multiple data units on the at least one configured grant occasion, wherein, based on a data unit among the multiple data units being transmitted firstly within the predetermined duration, information related to the at least one configured grant occasion to be used within the predetermined duration is transmitted.

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