Wireless Handover Delta Configuration Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing mobility and updating configuration parameters during handover procedures in wireless communication systems, leading to increased signaling overhead and complexity.
Innovation Solution
A method and apparatus for performing mobility in wireless communication systems by receiving and updating handover commands, identifying suitable target cells based on measurement results, and performing handovers with reduced signaling overhead by excluding unchanged configuration parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all configuration parameters are transmitted during handover procedures, then the target cell can receive complete configuration information, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the changed configuration parameters from the complete set and transmits them separately from the unchanged parameters. The handover command includes a delta configuration that contains only the modified parameters, while the unchanged parameters are excluded from transmission to reduce signaling overhead.
Solution Approach 2:
The configuration parameters are segmented into two groups: unchanged parameters that are retained from the source cell configuration, and changed parameters that are included in the delta configuration. This segmentation allows the system to transmit only necessary information while maintaining completeness.
2Adaptability or versatility
If complete handover commands are transmitted for all candidate target cells, then the wireless device can perform handover to any candidate cell, but the message size and complexity increase
Solution Approach 1:
Instead of transmitting complete handover commands for all candidate target cells, the patent transmits partial configuration information (delta configuration) that contains only the changed parameters. The wireless device combines this partial information with the stored source cell configuration to reconstruct the complete target cell configuration, reducing message complexity while maintaining handover flexibility.
3Reliability
If all configuration parameters are updated during handover, then the target cell configuration is complete, but the processing time and overhead increase
Solution Approach 1:
The wireless device preliminarily stores the source cell configuration information before handover. During the handover procedure, it only needs to apply the delta configuration (changed parameters) to the stored configuration, rather than receiving and processing all parameters from scratch. This preliminary action reduces processing time while ensuring configuration accuracy.
Data Source
AI summary
The present disclosure relates to method and apparatus for performing mobility in wireless communication system. According to an embodiment of the present disclosure, a method performed by a wireless device in a wireless communication system comprises: receiving a first message comprising handover commands of candidate target cells, each of the handover commands being related to an index; receiving a second message comprising the index related to a first handover command of a candidate target cell among the handover commands, and a second handover command of the candidate target cell; updating the first handover command based on the second handover command; identifying that the candidate target cell satisfies a handover condition for the candidate target cell based on a measurement result for the candidate target cell; and performing a handover to the candidate target cell satisfying the handover condition based on the updated first handover command.