Communication Repeater Timing Synchronization for TDD Interference
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Solution Overview
Problem
In shared repeater systems using Time Division Duplex (TDD) radio transmission, variations in time-division timing among different service providers cause mutual interference and deterioration in service quality or service stoppages.
Innovation Solution
A communication repeater system comprising a master station device and radio frequency units that convert base station signals into optical digital signals, with a setter and corrector to establish and adjust transmission/reception switching timing, reducing variations in TDD timing through precision time protocol (PTP) synchronization and correction of delays among service providers and slave station devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If TDD radio transmission is adopted to increase the number of devices, then device capacity increases, but variations in time-division timing among different service providers cause mutual interference and service quality deterioration
Solution Approach 1:
The patent changes the timing parameters by introducing a reference transmission/reception switching timing and correcting the time-division timing of each service provider to match this reference, thereby eliminating variations that cause mutual interference while maintaining increased device capacity
Solution Approach 2:
The master station device acts as an intermediary that sets the reference transmission/reception switching timing and notifies each radio frequency unit of their corrected timing, mediating between multiple service providers to coordinate their time-division timing and prevent interference
2Adaptability or versatility
If multiple service providers operate independently in shared repeater system, then service provider independence is maintained, but time-division timing variations cause mutual interference
Solution Approach 1:
The patent modifies the timing parameters of each service provider by correcting their transmission/reception switching timing to match the reference timing set by the master station, thereby eliminating mutual interference while allowing service providers to maintain their operational independence
Solution Approach 2:
The system implements feedback by having the master station device notify each radio frequency unit of their corrected transmission/reception switching timing, allowing each service provider to adjust their timing based on this feedback to achieve synchronized operation without interference
Data Source
AI summary
According to one embodiment, a communication repeater system includes a master station device and radio frequency units which convert a signal from each of base station systems into an optical digital signal for transmission to the master station device. The base station systems establish communication by time division duplex scheme. The communication repeater system repeats communication between a mobile communication terminal device and each base station system via a corresponding one of slave station devices. A setter sets, as reference transmission/reception switching timing, a transmission/reception switching timing between the master station device and one of the radio frequency units corresponding to one of the base station systems which is first connected to the communication repeater system. A corrector corrects variation in the transmission/reception switching timing in accordance with the reference transmission/reception switching timing.