Method and apparatus for inter-cell cross-TRP seamless mobility

By using mobility preconfigured RRC messages and time advance amount (TA) auxiliary information in the UE for RACH-free access, the problem of large inter-cell mobility delay is solved, and seamless inter-cell mobility and high data throughput are achieved.

CN119732111AActive Publication Date: 2025-03-28HUAWEI TECH CO LTD
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Patent Information

Application Number
CN202380058443.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-11-04
Filing Date
2023-08-07
Publication Date
2025-03-28
Estimated Expiration
2043-08-07

AI Technical Summary

Technical Problem

In the process of inter-cell mobility, the delay of inter-cell handover in the prior art is still large, resulting in service interruption and data throughput loss. Especially when the UEs that move rapidly in the frequency range 2 experience significant data throughput drop and service interruption during frequent inter-cell handovers.

Method used

The UE receives the mobility preconfigured RRC message from the source cell, uses the preconfigured target time advance amount (TA) auxiliary information to perform random access channel (RACH) mobility access, and determines the TA of the target cell based on the latest source cell TA, the reference signal time difference and the time-sensitive TA auxiliary information of the network update to achieve seamless mobility between cells.

Benefits of technology

It realizes seamless mobility between cells, reduces inter-cell handover delay, avoids service interruption, and maximizes data throughput.

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Abstract

In accordance with an embodiment, a UE receives, from a source cell, a mobility pre-configured radio resource control (RRC) message for a random access channel (RACH)-free access, in accordance with an embodiment of the present invention, the UE receives, from a source cell, a mobility pre-configured radio resource control (RRC) message for a random access channel (RACH)-free access. The mobility pre-configuration RRC message indicates a target timing advance (TA) auxiliary information. The method comprises the following steps of: receiving a mobility pre-configuration RRC message which indicates target TA auxiliary information; the UE receives a lower layer target access command from the source cell. The lower layer target access command indicates time sensitive dynamic (TA) assistance information that is recently updated or newest network updated. And the UE determines a target cell TA of the target cell according to a latest source cell TA of the source cell, a latest measured time difference between a reference signal (RS) from the source cell and a reference signal (RS) from the target cell, the time sensitive dynamic TA auxiliary information updated recently or updated newest network, and the target TA auxiliary information. And the UE executes the RACH-free mobility access to the target cell according to the TA of the target cell.
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