Neighbor Cell Synchronization Window Selection
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Solution Overview
Problem
Mobile communication units face challenges in efficiently synchronizing with neighbor cells while minimizing electricity consumption, as existing methods consume significant power and fail to rapidly complete synchronization within the required time frame.
Innovation Solution
A neighbor cell synchronization method that determines the feasibility of using either a wide or narrow synchronization window based on the communication mode, selecting the appropriate synchronization window to cover multiple contiguous frames or specific frame portions, and employing a counter-based scheduling mechanism to select cells for synchronization, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile communication unit continuously monitors all neighbor cells to ensure synchronization, then the synchronization reliability is improved, but the electricity consumption increases significantly
Solution Approach 1:
The patent segments the neighbor cell monitoring process into two distinct modes: wide synchronization window mode for initial cell search and narrow synchronization window mode for ongoing monitoring. This segmentation allows the system to use resource-intensive wide window monitoring only when necessary (during cell reselection or handover), while using energy-efficient narrow window monitoring for routine operations, thus resolving the contradiction between synchronization reliability and electricity consumption.
Solution Approach 2:
The patent implements periodic neighbor cell monitoring with variable周期的 (variable cycles) based on communication mode. During idle mode, the system performs more frequent monitoring with wider windows to ensure synchronization reliability. During active communication, it reduces monitoring frequency and uses narrower windows, thereby maintaining acceptable synchronization reliability while significantly reducing average electricity consumption over time.
2Speed
If the mobile communication unit uses a wide synchronization window to cover multiple frames for neighbor cell search, then the synchronization speed is improved, but the electricity consumption increases
Solution Approach 1:
The patent dynamically adjusts the synchronization window width based on the current communication mode and synchronization state. The system uses wide synchronization windows (covering multiple frames) only during specific conditions such as initial cell search or when synchronization is lost, providing fast synchronization speed when needed. For routine monitoring when already synchronized, it switches to narrow windows (single frame), dramatically reducing power consumption while maintaining acceptable synchronization performance.
3Reliability
If the mobile communication unit monitors more neighbor cells frequently, then the handover readiness is improved, but the processing complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the monitoring intensity for different neighbor cells based on their importance and current synchronization status. The system prioritizes monitoring of cells that are likely candidates for handover or cell reselection, using wide windows only for these high-priority cells while using narrow windows or reduced monitoring for less critical cells. This selective approach maintains handover readiness for critical cells while reducing overall processing complexity.
Data Source
AI summary
The present invention is directed to a neighbor cell synchronization method for a mobile communication unit. The method includes selecting a neighbor cell according to a scheduling mechanism; determining a synchronization window according to a communicating mode of the mobile communication unit; and searching or decoding specific logic channels within the synchronization window. The present invention also provides an apparatus for performing the method.