Cellular Timing Synchronization via Distributed Modular Cell Beacons
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Solution Overview
Problem
In cellular communication networks with dispersed modular cells, achieving precise timing synchronization among multiple small, low-power radios is challenging due to the absence of GPS receivers and the need for nanosecond-level timing accuracy to ensure additive signal reception without destructive interference.
Innovation Solution
A method involving primary and secondary modular cells that receive timing beacons from an out-of-band timing source, report transmission and reception timestamps to a cell controller, which calculates clock offsets and schedules transmissions to ensure synchronized data packet delivery to user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS receivers are installed in each modular cell to achieve precise timing synchronization, then timing accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces timing beacons as an intermediary mechanism to transfer timing information between modular cells. Instead of each cell independently acquiring GPS signals, timing beacons carry precise timing data from cells with GPS receivers to other cells, enabling synchronized operation without requiring GPS in every cell. This mediator approach resolves the contradiction by achieving high timing accuracy through centralized timing sources while keeping individual cell complexity low.
Solution Approach 2:
The system segments the timing synchronization function into two parts: cells equipped with GPS receivers that acquire timing from satellite signals, and cells without GPS that receive timing information via beacons. This segmentation allows the system to achieve nanosecond-level synchronization across all cells while avoiding the need to install expensive GPS receivers in every modular cell, thus reducing overall device complexity.
2Measurement precision
If timing beacons are transmitted between all primary and secondary modular cells to achieve synchronization, then timing coordination is improved, but signal transmission time and processing overhead increase
Solution Approach 1:
The system performs preliminary timing synchronization by having primary modular cells transmit timing beacons containing precise timing information before actual data transmissions occur. Secondary cells receive and process these beacons in advance to adjust their local clocks, establishing synchronized operation beforehand. This preliminary action eliminates the need for continuous real-time adjustment during data transmission, reducing processing overhead and transmission delays.
Solution Approach 2:
The timing beacon system implements feedback by having cells continuously monitor timing discrepancies and adjust their transmission schedules based on received beacon information. The cell controller collects timing data from all cells, calculates offsets, and directs adjustments to maintain synchronization. This closed-loop feedback mechanism ensures accurate timing coordination while minimizing iterative adjustments that would consume additional time.
3Power
If multiple modular cells transmit data simultaneously to user equipment, then signal-to-noise ratio is improved through additive effects, but timing synchronization requirements become more stringent
Solution Approach 1:
The patent merges the timing synchronization function across multiple modular cells through centralized control. The cell controller coordinates all primary and secondary cells to transmit data packets simultaneously by calculating and distributing appropriate timing offsets based on beacon reception times. This merging of timing control enables multiple cells to transmit in sync, achieving constructive additive effects at the user equipment while maintaining precise timing synchronization through unified coordination.
Data Source
AI summary
An aggregate cell of a cellular network includes a plurality of dispersed modular cells. The modular cells each include a cellular radio and collectively perform the function of a cellular base station. A distributed clock is established by transmitting timing beacons from one or more of the modular cells. Each modular cell receives the timing beacons. Each modular cell that transmits a timing beacon provides a transmission timestamp to a cell controller. Each modular cell that receives a timing beacon provides a reception timestamp to the cell controller. The cell controller schedules signal transmissions from the modular cells based on the transmission and reception timestamps.