Delta SN Mobility Commands Reduce Signaling Overhead
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing mobility related to dual connectivity (DC) and delta configuration updates, particularly in signaling and mobility commands for secondary node (SN) changes, which can lead to increased signaling overhead and inefficiencies.
Innovation Solution
A method and apparatus for a wireless device and radio access network (RAN) node that receive and process SN mobility commands, updating them based on measurement results to perform SN mobility to a target cell that satisfies specific conditions, thereby reducing signaling overhead by excluding unchanged configuration parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full SN mobility commands are transmitted for all candidate target PScells, then mobility management is comprehensive, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary updated configuration parameters from the full SN mobility command and transmits only these delta configurations. By removing unchanged parameters from the signaling message, the system reduces signaling overhead while maintaining comprehensive mobility management capability through selective parameter transmission.
2Manufacturing precision
If all configuration parameters are transmitted in SN mobility commands, then configuration completeness is ensured, but transmission efficiency decreases
Solution Approach 1:
The patent segments the SN mobility command into two parts: a first message containing SN mobility commands for multiple candidate target PScells with their indices, and a second message containing only the updated configuration parameters for the selected target PScell. This segmentation allows the system to maintain configuration completeness while improving transmission efficiency by avoiding redundant parameter repetition.
Solution Approach 2:
The patent changes the transmission approach from transmitting all configuration parameters to transmitting only delta configurations (parameter changes). By focusing on parameter changes rather than full parameter sets, the system maintains configuration completeness for the selected target PScell while significantly improving transmission efficiency.
3Measurement precision
If detailed SN mobility commands are provided for all candidate cells, then mobility decision accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies partial action by providing SN mobility commands for multiple candidate target PScells in the first message (excessive action to ensure accuracy) but then reducing the processing complexity in the second message by transmitting only the necessary updated parameters for the actually selected target. This allows the system to maintain mobility decision accuracy while reducing processing complexity through selective parameter transmission.
Data Source
AI summary
The present disclosure relates to method and apparatus for performing mobility related to dual connectivity (DC) in wireless communication system. According to an embodiment of the present disclosure, a method performed by a radio access network (RAN) node in a wireless communication system comprises: transmitting a first message comprising secondary node (SN) mobility commands of candidate target primary secondary cells (PScells), each of the SN mobility commands being related to an index; and transmitting a second message comprising the index related to a first SN mobility command of a candidate target PScell among the SN mobility commands, and a second SN mobility command of the candidate target PScell, wherein the second SN mobility command includes parameter values of at least one first entry that are updated from those of the at least one first entry in the first SN mobility command, and excludes parameter values of at least one second entry that are included in the first SN mobility command.