公开(公告)号：US20230112574A1

公开(公告)日：2023-04-13

申请号：US17939875

申请日：2022-09-07

Applicant: MEDIATEK INC.

Inventor： LI-CHUAN TSENG ,  Chia-Hao Yu

IPC: H04W36/00 ,  H04W74/08 ,  H04W56/00 ,  H04W74/00

Abstract: A method of acquiring timing advance (TA) for neighbor cells to reduce latency and interruption for inter-cell mobility is proposed. A UE is configured with a set of active cells for fast cell-switching. A neighbor cell in the active set is likely to be UE’s target cell. To reduce handover interruption, the UE acquires and maintains the TA corresponding to the cells in the active set. The UE performs early RACH for potential target cells and obtains the TA of the potential target cells. Once the UE receives handover command indicating one of the active cells as target cell, the UE can complete the handover without performing RACH again.

公开(公告)号：US20230095823A1

公开(公告)日：2023-03-30

申请号：US17945053

申请日：2022-09-14

Applicant: MEDIATEK INC.

Inventor： LI-CHUAN TSENG ,  Chia-Hao Yu ,  Kuan-Hung Chou ,  Chia-Chun Hsu ,  Yih-Shen Chen

IPC: H04W36/00 ,  H04W36/08 ,  H04W56/00

Abstract: A method of configuring a set of active cells among neighboring cells to reduce latency and interruption for inter-cell mobility is proposed. The set of active cells is an active set of cells among which UE can do fast cell switching. The set of active cells is configured by the network based on UE measurement report or network deployment information. UE maintains the configuration and can perform pre-synchronization to the configured active cells in downlink (DL) only or in both DL and uplink (UL). UE maintains the DL/UL synchronization with the active cells, and applies configuration once UE is indicated to switch to an active cell as the target cell. Because UE maintains the configuration and DL/UL timing of the target cell before receiving the cell-switch command, the mobility latency and interruption time for inter-cell mobility is reduced.