DAPS Handover Failure Classification for Mobility Robustness
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Solution Overview
Problem
Traditional mobility robustness optimization (MRO) methods are not fully applicable to dual active protocol stack (DAPS) handover scenarios where both source and target cell connections may fail, necessitating a new method to determine the type of handover failure.
Innovation Solution
A method and apparatus for determining DAPS handover failure types by analyzing information associated with the handover, including connection statuses and failure types at both the source and target cells, using information such as radio link failure reports and handover success reports, to optimize network performance and improve handover success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional MRO methods are used to determine handover failure types, then the determination process is simple, but the methods are not fully applicable to DAPS handover scenarios where both source and target cell connections may fail
Solution Approach 1:
The patent segments the handover failure determination into distinct scenarios based on connection states: source cell connection state (successful/failed) and target cell connection state (successful/failed). Each scenario has specific determination rules, allowing the system to handle DAPS handover complexity through structured classification rather than a single complex algorithm.
2Reliability
If DAPS handover is implemented to reduce service interruption delay, then handover performance is improved, but the complexity of determining failure types increases due to dual connection states
Solution Approach 1:
The patent implements dynamic determination rules that adapt based on the operational state of dual connections. The network device dynamically selects which failure type to report (too early handover, too late handover, or handover to wrong cell) based on the combination of source and target cell connection states, making the system flexible and adaptable to DAPS handover dynamics.
Solution Approach 2:
The patent changes the parameters used for failure determination based on connection states. Instead of using fixed parameters, the system adjusts which parameters are considered (e.g., whether to consider source cell RLF, target cell RLF, or both) depending on the DAPS handover scenario, thereby managing complexity through parameter adaptation.
3Duration of action of moving object
If both source and target cell connections are maintained during handover, then service continuity is improved, but the number of possible failure scenarios increases
Solution Approach 1:
The patent segments the complex failure detection problem into four distinct connection state scenarios: (1) source cell successful, target cell successful; (2) source cell successful, target cell failed; (3) source cell failed, target cell successful; (4) both cells failed. Each scenario has predefined determination rules, making failure identification manageable despite multiple simultaneous connections.
Solution Approach 2:
The patent establishes preliminary determination rules for each possible connection state scenario before failures occur. The network device is pre-configured with decision logic that automatically applies the correct failure type determination based on the observed connection states, eliminating the need for complex real-time analysis of failure scenarios.
Data Source
AI summary
Provided in embodiments of the present disclosure are a method and apparatus for determining a DAPS handover failure type. The method includes receiving DAPS handover failure related information sent by a terminal; and determining a DAPS handover failure type on the basis of the DAPS handover failure related information. In the embodiments of the present disclosure, a DAPS handover failure type is determined on the basis of DAPS handover failure related information reported by a terminal, which is suitable for a situation in which both a source cell side connection and a target cell side connection may fail in a DAPS handover process, implementing mobility robustness optimization for a DAPS handover process, assisting network optimization, and improving the handover success rate.