Mobility Management Timing Adjustment for Handover Reliability
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Solution Overview
Problem
Current wireless communication systems face failures during cell change procedures in heterogeneous networks, particularly when user equipment is moving between macro and small coverage cells, leading to delayed or failed handovers due to timing issues in sending target cell add messages.
Innovation Solution
A method and apparatus for mobility management that identifies a target cell as an active set candidate and adjusts the timing of sending a target cell add message based on trigger conditions, such as velocity and signal strength, to ensure timely communication and prevent call failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the timing value for sending target cell add message is delayed to ensure accurate cell selection, then the reliability of handover is improved, but the speed of mobility management deteriorates
Solution Approach 1:
The patent applies dynamics by making the timing value adjustable rather than fixed. The timing value is dynamically modified based on trigger adjustment conditions such as user equipment velocity and signal strength measurements. This allows the system to adapt the handover timing to current network conditions, resolving the contradiction between reliability and speed by optimizing the timing value for each specific scenario.
Solution Approach 2:
The patent changes the parameter of timing value based on detected conditions. When trigger adjustment conditions are met (e.g., high velocity, poor signal strength), the timing value is modified to expedite the handover process. This parameter change approach allows the system to maintain reliability under normal conditions while improving speed when conditions warrant faster handover.
2Speed
If the timing value is adjusted expeditiously based on trigger conditions, then the speed of handover is improved, but the complexity of mobility management increases
Solution Approach 1:
The patent implements preliminary action by pre-defining trigger adjustment conditions and corresponding timing value modifications. The system monitors for specific conditions (velocity thresholds, signal strength levels) and has pre-determined responses ready. This approach simplifies the complexity by providing a structured, rule-based framework rather than requiring complex real-time decision algorithms.
Solution Approach 2:
The patent uses feedback mechanisms where the system continuously monitors cell change procedures and adjusts timing values based on detected conditions. The feedback loop involves measuring parameters like velocity and signal strength, comparing them against thresholds, and automatically adjusting the timing value accordingly. This feedback-driven approach manages complexity through automated closed-loop control.
3Reliability
If the timing value is extended to allow for message processing, then the reliability of communication is improved, but the time duration of handover procedure increases
Solution Approach 1:
The patent applies dynamics by making the timing value adaptive rather than static. The timing value is dynamically adjusted based on real-time conditions such as user equipment velocity and signal strength. This allows the system to extend the timing value when processing needs are high (improving reliability) while keeping it short when conditions allow (reducing time loss), thus resolving the contradiction.
Solution Approach 2:
The patent changes the timing parameter based on detected conditions and trigger adjustment rules. When conditions indicate risk of failure (high velocity, weak signal), the timing value is extended to ensure reliable message processing. When conditions are favorable, the timing value is reduced to minimize handover duration. This parameter adaptation resolves the contradiction between reliability and time duration.
Data Source
AI summary
Apparatus and methods of mobility management include identifying a target cell as an active set candidate. The apparatus and methods further include determining that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that indicates a sending time of a target cell add message to a serving cell. Moreover, the apparatus and methods include sending the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.