DAPS Handover Failure Reporting for Wireless Devices
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Solution Overview
Problem
Current Dual Active Protocol Stack (DAPS) handover procedures in wireless communication systems face challenges such as information loss during handover failures and difficulties in identifying the root cause of failures, leading to suboptimal handover configurations and potential service disruptions.
Innovation Solution
Implementing enhanced reporting mechanisms for Control Plane (CP) information during DAPS handovers, where wireless devices declare radio link failures and store relevant measurements, allowing network nodes to receive and analyze these reports to identify failure causes and optimize handover parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If enhanced reporting mechanisms for Control Plane information are implemented during DAPS handovers, then measurement precision and reliability are improved, but device complexity increases
Solution Approach 1:
The reporting mechanism is segmented into different components: the wireless device stores measurements locally, declares radio link failures with specific cause values, and transmits structured failure information to the network node. This segmentation allows precise failure analysis while keeping individual components manageable in complexity.
Solution Approach 2:
The wireless device performs preliminary actions by storing measurements and declaring failures with cause values before the network node receives the information. This preliminary action ensures that when the network node receives the failure report, it already contains structured, analyzed data ready for optimization decisions.
2Reliability
If detailed handover failure information is collected and reported, then reliability of handover optimization is improved, but loss of time in processing and transmitting information increases
Solution Approach 1:
The wireless device performs preliminary processing by storing measurements and declaring failures with cause values before transmission. This preliminary action reduces the time required for network-side processing, as the data arrives in a structured, analysis-ready format rather than requiring extensive post-capture processing.
Solution Approach 2:
The structured failure information and measurements are fed back to the network node, which uses this feedback to optimize handover parameters. The feedback loop is efficient because the information is pre-processed and structured, reducing the time needed for the network to analyze and respond.
3Loss of information
If the wireless device stores and transmits detailed measurements and failure information, then information completeness is improved, but device complexity increases
Solution Approach 1:
The information storage and transmission is segmented into distinct structured elements: measurement data, failure cause values, and handover-specific information. This segmentation ensures completeness of information while making the storage and management tasks more manageable through organized, modular data structures.
Solution Approach 2:
The device changes the parameter of information organization from unstructured to structured by implementing specific data structures for measurements and failure reports. This parameter change in organization methodology improves information completeness while reducing the effective complexity of managing the data through standardized formats.
Data Source
AI summary
A method performed by a wireless device includes declaring a radio link failure (RLF) in a source cell of a source network node during a dual active protocol stack handover (DAPS HO) from the source cell of the source network node to a target cell of a target network node. The wireless device stores information associated with the DAPS HO and information associated with the RLF. The wireless device transmits the information to an access node.