Base Station VCO Synchronization Across Asynchronous Backhaul
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Solution Overview
Problem
Conventional base station synchronization systems face challenges in maintaining precise synchronization among multiple base stations, leading to phase differences and reduced user capacity, especially in difficult radio communication areas, due to deviations in master clock phase and propagation delays, which can cause communication breakdowns.
Innovation Solution
A base station synchronization system with a synchronization controller that generates synchronization control information to correct the input control voltage for each base station's master clock generator, ensuring precise synchronization among base stations, even over asynchronous networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If base stations with smaller user accommodating capacities are connected in place of base stations with larger user accommodating capacities, then the number of users accommodated in the system is reduced, but it enables coverage in shadow areas where radio communication is difficult
Solution Approach 1:
The system segments the base station network into different capacity tiers, allowing small-capacity base stations to be deployed in shadow areas for coverage while large-capacity base stations serve main areas for high user capacity. The base station concentrator manages this segmented network architecture.
Solution Approach 2:
Different base stations are assigned different capacities based on local requirements: small-capacity stations in shadow areas where coverage is the priority, and large-capacity stations in main areas where user capacity is the priority. This local quality differentiation resolves the contradiction between coverage area and user capacity.
2Adaptability or versatility
If a base station concentrator is used to supervise multiple base stations, then the base station controller can recognize multiple base stations as a single base station, but phase differences in master clock timing cause discontinuous free-running counter values
Solution Approach 1:
The base station concentrator measures the arrival timing of frame synchronization signals from each base station and calculates timing advance values. It then feeds back timing adjustment instructions to each base station, creating a closed-loop feedback system that continuously corrects phase differences and maintains synchronized free-running counter values.
Solution Approach 2:
The base station concentrator performs preliminary timing adjustment by calculating timing advance values before potential timing deviations affect system operation. This preliminary action prevents discontinuous counter values by proactively synchronizing all base stations to a reference timing.
3Adaptability or versatility
If frame synchronization signals are transmitted through asynchronous networks like ATM or IP circuits, then base stations can be connected flexibly, but propagation delays and drifts cause considerable timing differences among base stations
Solution Approach 1:
The base station concentrator acts as an intermediary that receives frame synchronization signals from base stations through asynchronous networks, measures their timing, and issues centralized timing adjustment instructions. This intermediary function compensates for the timing imprecision introduced by asynchronous networks while maintaining connection flexibility.
Solution Approach 2:
The system replaces direct hardware-level clock synchronization (mechanical approach) with software-based timing measurement and adjustment through the base station concentrator. This substitution allows asynchronous network connections while achieving synchronization through digital timing control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively suppresses phase differences among base stations, stabilizes data transmission windows, search windows, and achieves perfect chip-level synchronization, preventing communication breakdowns and enhancing overall system performance.
Implementation Method 1
a master clock generator which oscillates at a frequency corresponding to an input control voltage
Data Source
AI summary
A base station synchronization system, a synchronization controller, and a base station are provided that are capable of establishing precise synchronization among a plurality of base stations. In a base station synchronization system including a plurality of base stations and a base station concentrator, the base station concentrator includes a control information generator for generating synchronization control information, and each base station includes a VCO oscillating at a frequency corresponding to an input control voltage, and a corrector for correcting the input control voltage to the VCO according to the synchronization control information. This configuration makes it possible to establish synchronization among the master clocks of the plurality of base stations so as to suppress phase differences among the base stations and precisely synchronize the base stations with each other.