UE Session Status Handling During Conditional Handover
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Solution Overview
Problem
Current wireless communication systems face challenges in maintaining Quality of Experience (QoE) measurements during conditional handover (CHO) processes, especially when the UE moves out of the configured area scope or experiences changes in session status.
Innovation Solution
The proposed solution involves the UE providing session status indications to the target node during CHO execution, allowing the target node to handle the application session accordingly. This includes sending session start/stop/end indications and keeping track of session status changes, even if the UE moves out of the configured area scope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE executes conditional handover to a candidate target node, then service continuity is maintained, but the target node lacks accurate session status information for QoE measurement handling
Solution Approach 1:
The UE stores session status indications (session start/stop/end indications) locally before handover execution. When conditional handover is triggered, the UE retrieves and provides these pre-stored indications to the target node, ensuring the target node receives accurate session status information without waiting for post-handover reporting.
Solution Approach 2:
The UE acts as an intermediary that maintains session status information during the handover transition. By storing and forwarding these indications from the source node context to the target node, the UE bridges the information gap created during handover, enabling the target node to properly handle QoE measurements.
2Adaptability or versatility
If the UE moves out of the configured area scope during CHO, then mobility is supported, but QoE measurement accuracy deteriorates
Solution Approach 1:
The UE stores session status indications before leaving the configured area scope. Even when mobility causes the UE to move outside the original area scope, the pre-stored session status information remains valid and is provided to the target node, ensuring QoE measurement accuracy is maintained despite area scope violations.
3Measurement precision
If the UE provides session status indications during CHO execution, then QoE measurement accuracy is improved, but signaling overhead increases
Solution Approach 1:
The solution extracts only the essential session status indications (session start/stop/end indications) from the complete QoE measurement data. By providing only these critical status markers to the target node during handover, the signaling overhead is minimized while still enabling accurate QoE measurement handling.
4Loss of information
If the UE stores session status indications locally, then information availability is improved, but device memory requirements increase
Solution Approach 1:
The UE stores only the essential session status indications (session start/stop/end indications) rather than complete QoE measurement data. This extraction of critical information maintains information availability for handover while minimizing the memory burden on the UE device.
Data Source
AI summary
A method performed by a UE in a wireless communication network includes receiving a configuration for a conditional handover (CHO) from a source node to a candidate target node, executing the CHO to the candidate target node, and in connection with executing the CHO, and providing to the candidate target node a session status indication for an application session of the UE. A method performed by a target node in a wireless communication network includes receiving a CHO of a UE from a source node to the target node. In connection with the CHO, the target node receives a session status indication indicating a status for an application session of the UE, and handles the application session in accordance with the session status indication.