CHO and Fast MCG Link Recovery Coordination in 5G NR UE
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Solution Overview
Problem
The association between fast MCG link recovery and conditional handover procedures in 5G NR technology is not defined, leading to unclear UE behavior when both procedures are configured.
Innovation Solution
A method for receiving configuration information for fast MCG link recovery and conditional handover, evaluating execution conditions, and initiating appropriate procedures based on timers and conditions to manage the interaction between these processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both fast MCG link recovery procedure and CHO procedure are configured for a UE, then the UE can handle radio link failures more efficiently, but the UE behavior becomes undefined and complex
Solution Approach 1:
The patent applies preliminary action by having the UE stop evaluating CHO execution conditions immediately upon detecting RLF and initiating fast MCG link recovery procedure. This pre-emptive stopping of CHO evaluation prevents complex interactions between the two procedures, while still allowing the UE to maintain reliability through the fast recovery mechanism. The timer T316 is started in advance to control the recovery window.
Solution Approach 2:
The patent implements dynamics by making the CHO evaluation process conditional and dynamic - it stops when T316 timer is running and resumes when the timer stops. This dynamic behavior allows the system to adapt between fast recovery mode and normal CHO operation mode, resolving the contradiction between reliability and complexity by switching between operational states.
2Reliability
If the UE stops evaluating CHO execution conditions during fast MCG link recovery, then procedure conflict is avoided, but handover responsiveness may be delayed
Solution Approach 1:
The patent applies periodic action through the T316 timer mechanism, which periodically controls the CHO evaluation process. During the timer period (fast recovery phase), CHO evaluation is suspended. When the timer expires or is stopped, CHO evaluation resumes. This periodic on/off control resolves the contradiction by ensuring procedure conflict avoidance during critical recovery periods while maintaining handover responsiveness when recovery is complete.
3Productivity
If the UE performs CHO procedure while T316 timer is running, then handover can be executed, but procedure interference occurs
Solution Approach 1:
The patent applies preliminary anti-action by proactively preventing CHO procedure execution when the T316 timer is running. The UE is configured to stop evaluating CHO execution conditions before any potential interference can occur with the fast MCG link recovery procedure. This preventive measure eliminates procedure interference while maintaining the ability to execute handovers when appropriate.
Data Source
AI summary
Embodiments of the present application relate to a method and an apparatus for Conditional handover (CHO) and fast MCG link recovery. According to an embodiment of the present application, a method can include: receiving fast master cell group (MCG) link recovery configuration information; receiving CHO configuration information indicating a set of CHO configurations and a set of execution conditions for a set of cells, each cell is associated with a CHO configuration and an execution condition; and evaluating the set of execution conditions based on the CHO configuration information. Embodiments of the present application can define the CE behavior when both the MCG link recovery procedure and the CHO procedure are configured for the UE.