Adaptive Guard Band Setting for Asynchronous Base Stations
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Solution Overview
Problem
In broadband wireless communication systems, time offsets between Base Stations (BSs) due to clock drift or new BS installations lead to increased interference, affecting the Quality of Service (QoS) of Mobile Stations (MSs) and causing signal loss at cell boundaries.
Innovation Solution
A method and apparatus for setting a guard band in broadband wireless communication systems, where a controller generates a control signal to set a guard band when a time offset occurs, and a mapper outputs transmit data excluding the guard band, while an MS adjusts its guard band based on received messages to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guard band is set to mitigate interference from time offset, then the QoS of MS is improved, but the available bandwidth is reduced
Solution Approach 1:
The guard band configuration is made dynamic and adaptive rather than static. The base station determines the time offset between base stations and adaptively adjusts the guard band size accordingly. When time offset is large, a larger guard band is allocated; when time offset is small or compensated, the guard band is reduced or removed. This dynamic adjustment resolves the contradiction by optimizing the trade-off between interference mitigation and bandwidth utilization based on actual system conditions.
Solution Approach 2:
The system changes the parameter of guard band size based on the detected time offset conditions. By monitoring the time synchronization status between base stations and adjusting the guard band parameter dynamically, the system achieves optimal performance. This parameter change approach allows the system to adapt to varying time offset conditions while maximizing bandwidth efficiency.
2Stability of the object's composition
If time offset compensation is performed over wired or wireless network, then synchronization between BSs is improved, but the MS is subject to interference increase and QoS is not ensured
Solution Approach 1:
Instead of compensating for time offset after interference has affected the MS, the system performs preliminary action by proactively setting an appropriate guard band based on the detected time offset between base stations. This preliminary guard band configuration prevents interference from occurring in the first place, rather than attempting to compensate for it after the fact. The base station determines the time offset and configures the guard band in advance to protect MS from potential interference.
Solution Approach 2:
The guard band acts as an intermediary protective element between the asynchronous base station transmissions and the mobile station. Rather than directly compensating for time offset effects on the MS, the guard band serves as a buffer or mediator that prevents interference from reaching the MS. This intermediary approach isolates the MS from the harmful effects of time offset while maintaining system synchronization.
Data Source
AI summary
An apparatus and method for setting a guard band with respect to an asynchronous Base Station (BS) in a broadband wireless communication system are provided. The BS includes a controller for generating a control signal to set a guard band when a time offset occurs between BSs; a mapper for mapping and outputting transmit data to a band, excluding the guard band, of a unique band of the BS according to the control signal; and an operator for multicarrier-modulating data fed from the mapper.