Optical Repeater UL/DL Switching Synchronization
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Solution Overview
Problem
In 5G mobile communication systems, the synchronization of uplink (UL) and downlink (DL) switching timing between frequency bands across multiple optical repeater systems covering the same service area is challenging, especially when different base stations with varying switching timing differences are involved, leading to deviations in UL/DL switching timing that affect communication quality.
Innovation Solution
An optical repeater device with signal processors, a multiplexer/demultiplexer unit, a timing comparator, and a monitoring controller synchronizes the UL/DL switching times across multiple base stations and remote units by detecting and adjusting switching times and delays, ensuring alignment with internal and external targets to eliminate timing differences and improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple optical repeater systems cover the same service area with different base stations, then service coverage is expanded, but UL/DL switching timing synchronization between frequency bands becomes difficult to maintain
Solution Approach 1:
The optical repeater device detects the actual UL/DL switching timing from received wireless signals from multiple base stations and feeds back timing adjustment information to synchronize the switching timing across different frequency bands and multiple base stations, thereby maintaining synchronization while expanding service coverage
Solution Approach 2:
The device adjusts the switching timing parameter dynamically based on detected timing differences between base stations and frequency bands, enabling synchronization across multiple optical repeater systems by modifying the timing parameter to match the 3GPP protocol requirements
2Productivity
If carrier aggregation is applied with multiple frequency bands, then communication speed is improved, but switching timing adjustment between frequency bands becomes more complex
Solution Approach 1:
The optical repeater device automatically detects its own switching timing and adjusts it based on received signals from base stations, eliminating the need for manual timing configuration and reducing operational complexity while enabling carrier aggregation across multiple frequency bands
Solution Approach 2:
The device dynamically adjusts the switching timing parameter for each frequency band based on detected timing differences, allowing carrier aggregation to function correctly by ensuring all frequency bands switch at synchronized times according to the 3GPP protocol
3Area of stationary object
If remote units are dispersed at multiple locations, then service coverage is expanded, but timing synchronization among remote units from different master units becomes difficult
Solution Approach 1:
The optical repeater device performs multiple functions including detecting switching timing from multiple base stations, calculating timing adjustments for both internal and external master units, and controlling signal transmission, thereby achieving precise timing synchronization across all remote units regardless of which master unit they are connected to
Data Source
AI summary
An optical repeater has signal processors which detect switching between uplink and downlink signals of a first group of connected base stations. A multiplexer/demultiplexer unit is between the signal processors and a first plurality of remote wireless units. A timing comparator acquires signal switching times for the first group of base stations, calculates adjustments for synchronizing the switching transmission of a downlink signal to a remote unit based on both internal switching times and external switching times for a second group of base stations connected to another optical repeater. A monitoring controller acquires detected delay amounts for a first plurality of remote units, and calculates timing adjustments for synchronizing transmissions from the first group of remote units and another group of remote units connected to the other optical repeater based on the detected delay amounts and information from the other optical repeater.