Integrated Conditional Handover and Secondary Cell Group Change
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Solution Overview
Problem
The complexity of handovers between master nodes and cell changes between secondary nodes in multi-radio dual connectivity systems increases with the number of multiple connections, necessitating a method to integrate conditional handover (CHO) and conditional pscell addition or change (CPAC) to reduce complexity.
Innovation Solution
A method for operating a terminal in a wireless communication system that involves receiving configuration information for CHO and secondary cell group change, monitoring execution conditions, and performing either CHO or secondary cell group change based on the monitored conditions and an operation type, which can be simultaneous or sequential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate handover procedures for master node and secondary node are maintained, then reliability of individual procedures is preserved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent combines conditional handover (CHO) for master node and conditional PSCell change (CPAC) for secondary node into a single integrated procedure. The terminal receives unified configuration information containing both CHO configuration (source master node to target master node) and CPAC configuration (source secondary node to target secondary node), monitors both conditions simultaneously, and executes both handovers together when conditions are met, thereby reducing procedural complexity while maintaining reliability through unified management
2Adaptability or versatility
If multiple independent handover procedures are executed, then flexibility of individual procedures is maintained, but signaling latency and processing time increase
Solution Approach 1:
The patent configures both CHO and CPAC parameters in advance through unified configuration information before handover execution. The terminal pre-monitors both master node and secondary node conditions simultaneously, and when both execution conditions are satisfied, both handovers are executed together in a coordinated manner, reducing the total time required compared to sequential execution while maintaining the flexibility to execute only when conditions permit
Data Source
AI summary
Various embodiments are disclosed regarding a technology for operating conditional handover and conditional primary secondary cell addition or change. In one embodiment, a method of operating a terminal in a wireless communication system may comprise: receiving, from a first base station, a first message including configuration information related to conditional handover and secondary cell group change; performing monitoring of a first execution condition for the conditional handover and a second execution condition for the secondary cell group change based on the first message; transmitting, to a second base station, a second message including results of the monitoring; and performing at least one of the conditional handover or the secondary cell group change based on the monitoring and an operation type.