Wireless Base Station Synchronization Error Correction
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Solution Overview
Problem
In wireless communication systems, synchronization errors between wireless base stations increase when synchronization paths are separated by obstructions, leading to loss of synchronization and interference, especially at merge points where frame timing errors accumulate independently across different paths.
Innovation Solution
A wireless communication system where base stations determine frame timing based on synchronization timing information from an upper station and adjust it to correct errors, with a junction base station measuring synchronization errors between priority and non-priority paths to adjust frame timing accordingly, ensuring synchronization across multiple paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the average or median of multiple reception timings is used as frame timing, then synchronization with multiple adjacent base stations is achieved, but synchronization error accumulates at merge points of separated paths
Solution Approach 1:
The patent segments the synchronization management by designating specific base stations as reference base stations and others as non-reference base stations. Reference base stations independently determine frame timing from received synchronization signals, while non-reference base stations inherit timing from reference stations. This segmentation prevents error accumulation at path merge points by establishing independent timing references rather than averaging multiple potentially erroneous timing sources.
Solution Approach 2:
Instead of having each base station independently average timing from multiple paths (which accumulates errors), the patent inverts the approach by having base stations inherit timing from a designated reference station. This reversal of the timing determination hierarchy eliminates the accumulation problem by propagating a single authoritative timing source through the network rather than converging multiple independent timing sources.
2Ease of operation
If frame timing is determined independently from each synchronization path, then local synchronization is maintained, but synchronization error increases at path merge points
Solution Approach 1:
The patent applies local quality by giving different roles to different base stations based on their positions in the synchronization hierarchy. Reference base stations perform independent timing determination with high accuracy requirements, while non-reference base stations perform simpler timing inheritance with lower accuracy requirements. This differentiation allows the system to maintain overall synchronization reliability while reducing operational complexity for individual base stations.
Data Source
AI summary
In a wireless communication system including a plurality of wireless base stations, the wireless base stations other than the uppermost wireless base station among the plurality of wireless base stations each determine a frame timing on the basis of synchronization timing information received from the upper wireless base station, and the wireless base stations other than the lowermost wireless base station among the plurality of wireless base stations each notify the lower wireless base station of the synchronization timing information. A communication path from the uppermost wireless base station to the lowermost wireless base station includes a branch point and a merge point, and a junction base station that is the wireless base station installed at the merge point measures a synchronization error between a priority synchronization path and a non-priority synchronization path different from the priority synchronization path, the priority synchronization path being one of a plurality of the communication paths from the branch point to the merge point. Each of the plurality of wireless base stations installed on the non-priority synchronization path adjusts the frame timing on the basis of the synchronization error.