Base Station Synchronization via Coordinated Silence Periods
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Solution Overview
Problem
Wireless communication systems face challenges in synchronizing base stations efficiently, particularly in scenarios where GPS receivers are not available or are interfered with, leading to inefficiencies and reduced data rates due to asynchronous operations.
Innovation Solution
The method involves determining a silence duration for base stations based on the time required for neighboring stations to obtain or maintain synchronization, using a stratum level and Network Time Protocol (NTP) for asynchronous stations, and employing silence modules to coordinate periodic or message-based silences to reduce interference and enhance synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If base stations operate asynchronously to maintain continuous transmission, then device availability and continuous service are improved, but interference increases and data rates decrease
Solution Approach 1:
The patent implements periodic silence periods where base stations temporarily cease transmission at coordinated intervals. This allows neighboring base stations to synchronize their timing references without continuous interference, while maintaining overall system availability through periodic re-synchronization cycles.
Solution Approach 2:
The system performs preliminary synchronization actions during designated silence periods before resuming normal operations. By proactively establishing timing alignment during these pre-coordinated silent intervals, the system prevents interference accumulation that would occur with purely reactive synchronization approaches.
2Productivity
If base stations implement synchronization silence periods to reduce interference, then data rates and synchronization quality are improved, but transmission continuity and availability are worsened
Solution Approach 1:
The silence periods are implemented periodically rather than continuously, allowing base stations to resume normal high-rate transmissions after each synchronization interval. This periodic approach minimizes total transmission time loss while achieving the necessary synchronization for improved data rates during active periods.
Solution Approach 2:
The system applies silence periods selectively and partially - only during specific intervals and only for the minimum duration necessary to achieve synchronization. This partial application of the silence technique reduces overall transmission interruption while still obtaining the synchronization benefits needed for higher data rates.
3Measurement precision
If GPS receivers are used for synchronization, then timing accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses neighboring base stations as intermediary synchronization sources instead of direct GPS receivers at each site. A base station without GPS can synchronize by listening to silence periods of neighboring base stations that do have GPS, effectively using the neighbors as mediators to transfer timing information through the network.
Solution Approach 2:
The system copies timing reference information from base stations with GPS receivers to those without GPS capability. During silence periods, base stations transmit their timing references which neighboring stations can copy and use for synchronization, eliminating the need for every base station to have its own GPS receiver.
4Ease of operation
If base stations transmit continuously without coordination, then device availability is maintained, but synchronization quality and network efficiency deteriorate
Solution Approach 1:
The system maintains availability through periodic synchronization cycles rather than continuous coordination. Base stations operate independently between silence periods, maintaining service availability, then periodically align their timing during coordinated silence intervals to refresh synchronization quality and prevent drift accumulation.
Data Source
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AI summary
A method for synchronizing a wireless communication system is disclosed. A silence duration for a base station is determined based on the time required for a neighbor base station to obtain or maintain synchronization. All transmissions from the base station are ceased for the silence duration. Multiple base stations level may cease transmissions at the same time, thus mitigating interference.