Mobile Terminal Handoff Execution Condition Evaluation
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Solution Overview
Problem
In heterogeneous LTE deployments, handover processes between macro and small cells are not robust, leading to handover failures and increased battery consumption due to challenges in signal reception and UE discovery in small cell layers.
Innovation Solution
A method where the mobile terminal receives a handoff command message with a handoff execution condition, allowing it to delay or defer the handover until optimal timing, such as when connectivity with the source cell is lost, and executes the handover by performing a random access channel procedure with the target base station, ensuring predictable and efficient handover execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If handover is executed immediately upon receiving command, then handover speed is improved, but handover reliability deteriorates due to premature execution before optimal timing
Solution Approach 1:
The mobile terminal performs preliminary actions by receiving and storing the handover command message before execution, evaluating execution conditions (such as signal strength thresholds or timer expiration) before triggering handover. This preliminary preparation allows the system to maintain readiness while waiting for optimal execution conditions, resolving the contradiction between immediate execution speed and execution reliability.
2Reliability
If handover is delayed until optimal timing, then handover reliability is improved, but handover speed deteriorates due to deferred execution
Solution Approach 1:
The handover execution timing is made dynamic rather than static. The system continuously monitors execution conditions (signal strength, quality metrics, timer status) and triggers handover when conditions are met, rather than using a fixed immediate or delayed schedule. This dynamic approach allows the system to adapt to changing radio conditions, achieving both reliability through condition evaluation and speed through timely execution when conditions permit.
3Reliability
If handover execution condition evaluation is performed, then handover robustness is improved, but device complexity increases due to additional determination logic
Solution Approach 1:
The execution condition evaluation relies on changes in measurable parameters such as signal strength (RSRP), signal quality (RSRQ), or timer expiration states. By monitoring these physical parameters and comparing them against predefined thresholds, the system achieves robust handover control through simple parameter-based decisions rather than complex algorithmic evaluation, thus improving reliability while minimizing added complexity.
Data Source
AI summary
The invention relates to an improved handover procedure for a mobile terminal. Under control of the target base station, the mobile terminal is to perform a handoff to a target base station, wherein it is to be configured for communication with the target base station via a target radio cell comprising a downlink carrier and an uplink carrier. The mobile terminal receives a handoff command message for the handoff to the target base station including a handoff execution condition as trigger for executing handoff to the target base station. Then, the mobile terminal determines, based on the received handoff execution condition, whether or not the mobile terminal is to trigger execution of the handoff to the target base station. In case the mobile terminal determines that it is to trigger execution of the handoff to the target base station, the mobile terminal executes the handoff to the target base station.