Radio Signal Timestamping Unit for Base Station Clock Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in achieving accurate and cost-effective timing synchronization for base stations, especially with the increasing demands of 5G networks, due to limitations in existing technologies like IEEE 1588 and GPS, which are insufficient for next-generation wireless networks.
Innovation Solution
The implementation of a Radio Signal Timestamping Unit (RSTU) that uses a high-precision time source to synchronize base stations by receiving timing information from wireless signals, calculating propagation delays, and providing timing correction information via wireless or fixed connections, allowing for accurate synchronization without the need for expensive hardware modifications at base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS receivers are deployed at each base station to achieve high accuracy synchronization (approximately 50 nsec), then timing precision is improved, but cost increases and reliability decreases due to vulnerability to jamming attacks, solar flares, and ineffectiveness inside buildings
Solution Approach 1:
The patent introduces a master clock as an intermediary time source that base stations can use alternatively or complementarily to GPS. The master clock receives timing signals via wired connections (fiber optic, coaxial, twisted pair) and distributes synchronized time to base stations, providing a reliable backup that is not vulnerable to GPS jamming or solar flares. This intermediary solution maintains synchronization accuracy while improving reliability under failure modes.
Solution Approach 2:
The patent changes the transmission medium parameter from wireless GPS signals to wired connections (fiber optic, coaxial, twisted pair) for time distribution. This parameter change eliminates vulnerability to electromagnetic interference and jamming while maintaining or improving synchronization accuracy. The wired infrastructure provides stable, reliable time delivery that is not affected by atmospheric conditions or intentional interference.
2Ease of manufacture
If IEEE 1588 PTP is used to synchronize base stations via wired connections, then deployment is simplified, but timing accuracy deteriorates to approximately 1.5 microseconds over metro-sized areas
Solution Approach 1:
The patent implements a feedback mechanism where the master clock continuously monitors and adjusts time distribution to base stations. The system measures actual time delivery accuracy and uses this feedback to compensate for drift and delays, maintaining nanosecond-level synchronization accuracy over large geographic areas. This feedback loop eliminates the accuracy degradation that occurs with standard IEEE 1588 PTP over metro areas.
3Productivity
If the number of base stations is increased to support increasing data demands, then network capacity is improved, but synchronization complexity and cost increase significantly
Solution Approach 1:
The patent creates a universal master clock infrastructure that can serve any number of base stations through the existing wired backhaul network. The master clock uses standard time distribution protocols that are already implemented in cellular networks, allowing it to scale to support increasing numbers of base stations without proportionally increasing synchronization complexity. This universal solution replaces the need for each base station to have independent GPS receivers or complex PTP implementations.
Data Source
AI summary
Disclosed are methods, devices and systems for generating accurate timestamps for wireless communications signals that can be used to correct the clocks of base stations for wireless communications systems. A radio signal timestamping unit (RSTU) receives a wireless signal including timing information broadcast by a base station. The RSTU includes a local clock that is in communication with a high-precision time source and provides high-accuracy timing information to one or more base stations to maintain accurate clock synchronization among the plurality of base stations. The timing synchronization information can be determined at least in part based on the propagation delay of the wireless signals received at the RSTU.