Early uplink synchronization method in user equipment, and user equipment

By receiving the PDCCH order in the user equipment and applying the CLTM early synchronization TA command to start the TAT timer, the problem of early uplink synchronization management in the UE during the CLTM process is solved, and the efficiency and reliability of the LTM process are improved.

WO2026124534A1PCT designated stage Publication Date: 2026-06-18SHARP KK +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SHARP KK
Filing Date
2025-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

In condition-based Layer 1/Layer 2 triggered mobility (LTM) processes, how can user equipment (UE) effectively manage early uplink synchronization to avoid unnecessary synchronization timer maintenance and random access procedures?

⚗Method used

The user equipment receives the random access procedure triggered by the PDCCH order, applies the CLTM early synchronization TA command, starts or restarts the time alignment timer TAT, and indicates the synchronization status to the upper layer through the MAC layer, managing the synchronization process of the CLTM candidate cells.

🎯Benefits of technology

It enables effective management of early synchronization of candidate cells in a CLTM-configured network, avoids unnecessary synchronization timer maintenance and random access procedures, and improves the efficiency of the LTM process.

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Abstract

The present invention provides an early uplink synchronization method in a user equipment (UE), and a UE. The early uplink synchronization method in a UE comprises: the UE receives a PDCCH order for triggering early uplink synchronization of an LTM target candidate cell; the UE initiates a random access procedure triggered by the PDCCH order, and sends a random access preamble to the LTM target candidate cell; and when receiving a CLTM early synchronization TA command comprising at least a TA value from a network side, the UE performs at least one operation among the following operations: operation 1: applying the CLTM early synchronization TA command to an associated CLTM target candidate cell; operation 2: starting or restarting a time alignment timer (TAT) associated with the CLTM early synchronization TA command; operation 3: a MAC layer of the UE indicating to the upper layer the reception of the CLTM early synchronization TA command; and operation 4: an RRC layer of the UE applying a configuration of one TAT.
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