METHOD AND APPARATUS FOR RANDOM ACCESS PROCEDURE FOR SECONDARY CELL BEAM FAILURE RECOVERY IN A WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20210321461A1

    公开(公告)日:2021-10-14

    申请号:US17220311

    申请日:2021-04-01

    Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE initiates a random access procedure. The UE receives a Physical Downlink Control Channel (PDCCH) transmission. The UE determines whether contention resolution associated with the random access procedure is successful. If the initiating the random access procedure is performed for Special Cell (SpCell) beam failure recovery, the determining whether the contention resolution is successful is based on whether the PDCCH transmission is addressed to a Cell Radio Network Temporary Identifier (C-RNTI) of the UE. If the initiating the random access procedure is performed for Secondary Cell (SCell) beam failure recovery, the determining whether the contention resolution is successful is based on whether the PDCCH transmission is addressed to the C-RNTI of the UE and whether the PDCCH transmission contains an uplink (UL) grant for a new transmission.

    Method and apparatus for transmitting device-to-device sidelink report in a wireless communication system

    公开(公告)号:US11109363B2

    公开(公告)日:2021-08-31

    申请号:US17077362

    申请日:2020-10-22

    Abstract: A method and apparatus are disclosed from the perspective of a first device for performing sidelink communication. In one embodiment, the first device includes a MAC CE in a MAC PDU, wherein if the MAC PDU comprises the MAC CE without data, SL HARQ feedback is disabled for the MAC PDU. The first device further includes sidelink data associated with a first sidelink logical channel in the MAC PDU, wherein the first sidelink logical channel is configured to enable sidelink HARQ feedback. The first device also sets or indicates enable SL HARQ feedback for the MAC PDU in a SCI, wherein the SCI schedules a sidelink transmission delivering the MAC PDU. Furthermore, the first device transmits the SCI and performs the sidelink transmission to a second device.

    METHOD AND APPARATUS FOR OBTAINING TIME ALIGNMENT REGARDING MULTIPLE TRPS IN A WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20250016846A1

    公开(公告)日:2025-01-09

    申请号:US18889368

    申请日:2024-09-18

    Abstract: Methods, systems, and apparatuses are provided for enhancing timing alignment for uplink (UL) multi-Transmission/Reception Point (TRP) (or mTRP) scenarios in a wireless communication system. A method for a UE in a wireless communication system can comprise receiving a signaling, wherein the signaling indicates activation for a first TRP and/or is a Physical Downlink Control Channel (PDCCH) signal, determining to perform a first random access procedure on the first TRP, based on the signaling, to obtain a first Time Alignment (TA) information associated with the first TRP, and performing multi-TRP operation on the first TRP associated with the first TA information and a second TRP associated with a second TA information.

    METHOD AND APPARATUS FOR FAILURE HANDLING IN SERVING CELL CHANGE IN A WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20230308962A1

    公开(公告)日:2023-09-28

    申请号:US18126109

    申请日:2023-03-24

    CPC classification number: H04W36/0079 H04W36/0064 H04W36/249 H04W36/00835

    Abstract: A method for a User Equipment (UE) in a wireless communication system can comprise receiving, from a first cell, a first signaling indicative of a configuration of at least a second cell, receiving, from the first cell, a second signaling to switch a Special Cell (SpCell) of the UE to the second cell, wherein the second signaling comprises at least one of a Physical Downlink Control Channel (PDCCH) signaling or a Medium Access Control (MAC) Control Element (CE), performing a procedure to switch the SpCell of the UE in response to the second signaling, performing one or more actions in response to detecting a failure of the procedure, including: initiating a random access procedure on the second cell, transmitting a report to a network of the first cell, wherein the report indicates the unsuccessful switching of the SpCell to the second cell, or initiating a RRC connection re-establishment procedure.

    METHOD AND APPARATUS FOR UPLINK TIME ALIGNMENT IN A WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20230199638A1

    公开(公告)日:2023-06-22

    申请号:US18081734

    申请日:2022-12-15

    CPC classification number: H04W48/20 H04W74/0833

    Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first signaling indicating a configuration of a first cell, wherein the first cell is associated with a first timing advance group (TAG). The UE receives a second signaling indicative of addition of the first cell as a first Serving Cell. In response to the second signaling, the UE (i) adds the first cell as the first Serving Cell, and (ii) determines whether to initiate a random access procedure based on the second signaling, and/or based on whether the first cell is associated with a first valid timing advance value.

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