Lower layer conditional handover (CHO) cell handover

By employing lower-layer signaling (L1 and L2) for conditional handover in wireless communication systems, the problems of high cell handover latency and complexity in existing technologies are solved, enabling faster and more accurate candidate cell selection.

CN122423261APending Publication Date: 2026-07-17QUALCOMM INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QUALCOMM INC
Filing Date
2023-12-27
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing wireless communication systems, cell handover processes are based on Layer 3 signaling, which results in high latency and complexity, and makes it impossible to effectively utilize user equipment-specific information for fast and accurate candidate cell selection.

Method used

Conditional handover (CHO) is performed using lower-layer signaling (L1 and L2 signaling), allowing user equipment to select candidate cells based on lower-layer signaling and perform measurements and reports through L1 and L2 signaling, thereby reducing handover latency and complexity.

Benefits of technology

By using a conditional handover process with lower-layer signaling, the latency and complexity of cell handover are reduced, and the efficiency and accuracy of candidate cell selection are improved.

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Abstract

Various aspects of this disclosure relate to methods for performing lower-layer triggered mobility (LTM) while still providing a user equipment (UE) with the ability to select preferred candidate cells for handover. In some examples, the method may include the UE receiving LTM configuration information from a first cell (e.g., the current serving cell), including an indication of a set of candidate cells for a conditional handover procedure, the candidate cell set including a second cell. The method may also include receiving lower-layer signaling from each candidate cell in the candidate cell set. The method may further include performing a conditional handover procedure with the second cell, wherein the second cell is selected from the candidate cell set for the conditional handover procedure based on the received lower-layer signaling.
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