Dual Active Protocol Stack Handover RLF Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling radio link failures during Dual Active Protocol Stack (DAPS) handovers, particularly in reporting failures between the source and target nodes, leading to sub-optimal network decisions and configurations.
Innovation Solution
A method where a wireless communication device generates and reports radio link failure (RLF) reports for both the source and target nodes during DAPS handovers, allowing network nodes to identify and forward these reports to the respective serving nodes, ensuring comprehensive failure information is transmitted to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless communication device reports RLF information for both source and target nodes, then the network decision-making quality is improved, but the signaling overhead and complexity increase
Solution Approach 1:
The RLF report is segmented into distinct components: source node failure information and target node failure information. Each segment contains specific measurement results and failure causes relevant to that node, allowing the network to process each segment independently and efficiently without being overwhelmed by a monolithic report structure.
Solution Approach 2:
The RLF report mechanism is designed to serve multiple functions simultaneously: it provides failure diagnostics for both source and target nodes, supports network optimization decisions, enables identification of sub-optimal configurations, and facilitates coordinated handling of dual-connectivity failures. This multi-functional approach improves information completeness without requiring separate reporting procedures.
2Reliability
If the network node forwards RLF reports to respective serving nodes, then the network performance is improved, but the network complexity increases
Solution Approach 1:
The network node acts as an intermediary that receives the segmented RLF reports, identifies the respective serving nodes for source and target cells, and forwards the appropriate information segments to each. This intermediary function simplifies the overall network architecture by centralizing the routing logic while maintaining the benefits of distributed failure analysis at the serving nodes.
Data Source
AI summary
A wireless communication device and a method performed by the device, enabled to perform a Dual Active Protocol Stack handover (HO) from a source node/cell to a target node/cell is provided. Responsive to detecting a radio link failure, RLF, on a source link between the device and the source node/cell, a RLF report related to the source node/cell is generated. Responsive to detecting a RLF on a target link between the device and the target node/cell, a RLF report related to the target node/cell is generated. An indication is included on a subsequent uplink RRC message to a network node that the device has one or more RLF reports related to DAPS HO failure. Responsive to receiving a request from the network node to send the one or more RLF reports, the one or more RLF reports are transmitted to the node.