Managing transmission configuration indicator states for low layer triggered mobility

By converting the long-bit PCI into a short-bit candidate cell ID and activating the TCI state, the efficiency problem of TCI state management in the LTM process is solved, achieving the effects of fast cell handover and reduced latency.

CN122460148APending Publication Date: 2026-07-24GOOGLE LLC
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Patent Information

Application Number
CN202480077859.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-11-02
Filing Date
2024-10-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing wireless communication systems fail to effectively manage the Transmission Configuration Indicator (TCI) state during Low Layer Triggered Mobility (LTM) processes, resulting in prolonged serving cell changes, increased overhead, and extended outage times.

Method used

By converting the long-bit Physical Cell Identifier (PCI) into a short-bit candidate cell ID and using MAC CE to activate or deactivate the TCI state of LTM candidate cells, signaling delays during the LTM process are reduced, enabling fast cell handover.

Benefits of technology

It reduces latency and overhead during LTM, improves the efficiency and reliability of cell handover, and reduces downtime.

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Abstract

Methods and apparatus operate within a radio access network to facilitate fast serving cell changes using a low layer triggered mobility (LTM) procedure, reducing latency and overhead relative to an L3 triggered cell handover procedure. LTM execution is triggered by an L1 measurement report. Methods and apparatus according to various embodiments exchange LTM related configurations including an LTM identity (ID) and at least one LTM transmission configuration indicator (TCI) state configuration. The LTM TCI state configuration is associated with an LTM ID, or is associated with a TCI state ID, or is associated with a candidate cell ID.
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