Radio Mobility Control with Multiple Candidate Cells
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Solution Overview
Problem
Existing radio communication systems face issues with frequent cell changes and increased transmission delays due to L1/L2-triggered mobility, leading to ping-pong effects and degraded Quality of Service (QoS) for User Equipment (UE).
Innovation Solution
Implementing a mobility management solution that configures multiple K1 candidate cells for a serving cell, using L1/L2 signaling to enhance robustness and reduce transmission delay, including L3-triggered mobility scenarios, and supporting various communication scenarios such as V2X and Non-Terrestrial Networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If L1/L2-triggered mobility is implemented to enhance mobility performance, then mobility speed and responsiveness are improved, but frequent cell changes and ping-pong effects occur leading to degraded QoS
Solution Approach 1:
The patent applies preliminary action by configuring multiple candidate cells (K1 candidate cells) in advance before handover is needed. When mobility triggering occurs, the UE can immediately select from pre-configured candidate cells without waiting for random access procedures, thereby maintaining high mobility speed while avoiding ping-pong effects through predetermined selection criteria.
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically select the most appropriate candidate cell from the pre-configured K1 candidates based on real-time channel conditions and mobility requirements. This dynamic selection mechanism allows the system to adapt to changing conditions while maintaining stable connectivity, thus improving QoS without sacrificing mobility performance.
2Loss of time
If L1/L2-triggered mobility with single candidate cell is used, then transmission delay is reduced, but mobility robustness is insufficient leading to frequent handovers
Solution Approach 1:
The patent applies parameter changes by transitioning from a single candidate cell configuration to a multi-candidate cell configuration (K1 candidates). This parameter change allows the system to maintain low transmission delay by selecting from multiple pre-configured options without requiring random access procedures, while simultaneously improving mobility robustness through diversified selection choices that reduce ping-pong effects.
3Reliability
If multiple candidate cells are configured for handover, then mobility robustness is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent reduces signaling overhead by performing preliminary configuration of K1 candidate cells during initial connection setup or earlier handover preparations. This preliminary action eliminates the need for repeated random access signaling during actual handover execution, as the UE can directly select and execute handover to a pre-configured candidate cell based on simple measurement criteria, thus maintaining mobility robustness while reducing real-time signaling complexity.
Data Source
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AI summary
Disclosed in the present application are a method and apparatus used in a communication node for radio communication. The method comprises: a communication node receiving first signaling, wherein the first signaling indicates K1 candidate cells, which are at least configured for a first serving cell, K1 being an integer greater than 1; and applying at least one of K1 candidate configurations along with the first signaling, the first signaling is used for mobility control; the K1 candidate configurations respectively correspond to the K1 candidate cells; each of the K1 candidate configurations comprises a candidate cell identifier of one of the K1 candidate cells, and the candidate cell identifiers of any two of the K1 candidate cells are different; and the first signaling is used for triggering a behavior to apply at least one of the K1 candidate configurations.