Base Station Guard Time Adjustment for Synchronization Drift
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Solution Overview
Problem
Current wireless communication systems using Time Division Duplex (TDD) face synchronization loss issues, where base stations can only maintain stability for hours due to the limitations of stability oscillators, leading to potential interference and the need for timely repair to prevent system instability.
Innovation Solution
Implementing a synchronization monitor and guard time updater system that adjusts transmit and receive guard times by one symbol time in response to timing reference loss, extending the survivability of base stations by allowing them to maintain data transmission and reception for days even after losing synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a stability oscillator is used to maintain timing synchronization at a base station, then the base station can operate continuously, but the synchronization is only maintained for hours before drift occurs
Solution Approach 1:
The system performs preliminary actions by adjusting guard times before synchronization loss becomes critical. The synchronization monitor detects drift conditions and the guard time updater proactively modifies transmit and receive guard times to compensate for anticipated synchronization degradation, preventing interference before it occurs.
Solution Approach 2:
The system implements feedback through the synchronization monitor that continuously tracks timing reference status and provides information to the guard time updater. This closed-loop feedback mechanism allows the system to adapt guard times based on actual synchronization conditions, extending operational duration while maintaining reliability.
2Reliability
If guard times are increased to compensate for synchronization drift, then interference is prevented, but transmission and reception time are reduced
Solution Approach 1:
The system applies dynamics by making guard times adjustable rather than fixed. The guard time updater dynamically modifies transmit and receive guard times based on synchronization status, allowing the system to optimize between interference prevention and transmission efficiency under different operational conditions.
Solution Approach 2:
The system changes the parameter of guard time duration in response to synchronization conditions. By modifying guard times as a variable parameter rather than maintaining a fixed value, the system can compensate for drift while minimizing impact on overall transmission productivity.
3Productivity
If the base station waits for repair before shutting down, then data transmission can continue, but the base station may cause interference to neighboring devices
Solution Approach 1:
The system takes preliminary action by adjusting guard times before interference problems arise. The synchronization monitor detects drift conditions and triggers guard time adjustments that prevent interference with neighboring devices, allowing the base station to continue operating without causing harmful effects.
Solution Approach 2:
The system converts the harmful effect of synchronization drift into a beneficial adjustment opportunity. Rather than shutting down immediately when drift is detected, the system uses the drift condition as a trigger to adjust guard times, transforming a potential interference problem into a system optimization moment.
Data Source
AI summary
Disclosed are a wireless communication system, method, and site controller for mitigating at least one of a transmission timing synchronization loss and a receiving timing synchronization loss at a base station. The method includes determining, at a first base station, a loss of a timing reference the timing reference is used by the first base station for timing synchronization of at least one of a transmission and reception of wireless data. The timing synchronization is predefined and common between at least the first base station and a second base station. The method further includes adjusting, in response to the determining, at least one of a transmit guard time and a receive guard time by at least one symbol time.