5G NR Handover Coordination With Conditional PSCell Change
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Solution Overview
Problem
Existing 5G NR systems face challenges in ensuring minimal interruption and high reliability during handover processes, particularly for services requiring ultra-reliability and low latency such as remote control, aerial, and industrial automation, as traditional mobility performance metrics fall short in meeting these requirements.
Innovation Solution
The implementation of a mechanism that supports the coexistence of conditional handover (CHO) and conditional primary secondary cell addition or change (CPAC) procedures, involving coordinated communication between master and secondary wireless communication nodes to optimize handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used in 5G NR systems, then the network structure is simple, but the handover interruption time is long and reliability is insufficient for ultra-reliable low-latency services
Solution Approach 1:
The patent applies preliminary action by pre-configuring candidate target cells and preparing handover parameters before the actual handover execution. The network node evaluates candidate cells in advance and prepares necessary configuration information, enabling the UE to execute handover quickly when triggered without significant interruption time.
Solution Approach 2:
The handover procedure is segmented into multiple stages: candidate cell evaluation, handover preparation, execution triggering, and completion confirmation. This segmentation allows parallel processing of handover preparation activities while maintaining control over the execution timing, reducing overall handover interruption time.
2Reliability
If conditional handover and conditional PSCell addition/change procedures coexist, then handover reliability is improved, but the signaling complexity between network nodes increases
Solution Approach 1:
The patent applies universality by designing a unified handover decision framework that can handle multiple handover scenarios (conditional handover, conditional PSCell addition, normal PSCell change) through a common set of procedures and message structures. This reduces the complexity of managing multiple separate procedures by finding commonalities in their execution.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports measurement information and handover status to the network node, and the network node provides feedback on handover decisions and configuration status. This feedback loop enables dynamic adjustment of handover parameters and simplifies coordination between multiple procedures by maintaining real-time awareness of system state.
Data Source
AI summary
A system and method for improving mobility performance. The system and method include receiving, by a target master wireless communication node (MN) from a source master wireless communication node (MN), a handover request to begin a handover procedure; and transmitting, by the target MN to a target secondary wireless communication node (SN), a first message to inform the target SN about a type of SN addition or change procedure to perform the handover request, wherein the first message causes the target SN to send a second message to the target MN to inform the target MN of one or more configured primary secondary (PSCells).