TDD Interference Detection via Guard Period Isolation
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Solution Overview
Problem
Identifying and rectifying interference in Time Division Duplex (TDD) cellular networks is challenging due to the difficulty in differentiating uplink and downlink transmissions and unwanted interference signals in the same frequency band, which affects user experience by causing degraded call success rates, increased dropped calls, and reduced data throughput.
Innovation Solution
A test device equipped with a receiver, spectrum analyzer, and processing circuit that automatically detects the TDD frame structure, determines the transition period between uplink and downlink transmissions, and detects interference signals during this period, displaying the spectrum data to facilitate the identification and location of interference sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectrum display is used to view TDD signals, then the entire bandwidth is displayed, but it becomes very difficult to differentiate UL and DL transmissions as well as unwanted interference signals
Solution Approach 1:
The patent segments the TDD signal analysis by isolating the guard period (GP) from the rest of the frame structure. The processing circuit identifies and extracts signals specifically during the GP time period, separating interference detection from regular UL/DL transmission analysis. This segmentation allows clear differentiation of interference signals without analyzing the entire bandwidth continuously.
Solution Approach 2:
The patent extracts the guard period portion from the complete TDD frame structure for dedicated interference analysis. By taking out this specific time window where no UL or DL signals are transmitted, the system can focus computational resources on detecting interference signals during this isolated period, simplifying the overall signal analysis process.
2Productivity
If manual interference detection methods are used, then technicians can identify interference sources, but the process is time-consuming and difficult
Solution Approach 1:
The system performs preliminary action by automatically identifying and isolating the guard period in the TDD frame structure before interference detection begins. The processing circuit pre-configures the analysis window to match the GP timing, so that when interference detection is performed, the correct time period is already prepared and ready for analysis, eliminating manual configuration steps.
Solution Approach 2:
The system implements self-service through automatic TDD frame structure detection and guard period identification. The processing circuit autonomously determines the frame configuration, special subframe configuration, and GP location without requiring manual input from technicians. This automation significantly reduces both the time and difficulty of interference detection.
3Measurement precision
If the entire TDD frame is analyzed for interference, then comprehensive coverage is achieved, but UL and DL signals mask the interference signals making detection difficult
Solution Approach 1:
The patent extracts only the guard period portion from the complete TDD frame for interference analysis. During the GP, no UL or DL signals are transmitted, so extracting this specific time window removes the masking effect of strong communication signals while still providing comprehensive interference detection coverage for the frequency band.
Solution Approach 2:
The system segments the signal analysis by focusing exclusively on the guard period time segment rather than analyzing the entire TDD frame. This segmentation reduces the quantity of signal data that must be processed while maintaining detection accuracy, as the GP segment is specifically designed to be free from UL/DL signal contamination.
Data Source
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AI summary
A test device is operable to detect interference in a time division duplex (TDD) cellular network. The test device can automatically detect a TDD frame structure of RF signals received over the air Eagle Eye from a cell site. The test device determines a transition period between uplink (UL) and downlink (DL) transmissions in which no UL and DL signals are being transmitted based on the TDD frame structure. An interference signal is detected during the transition period, and the test device can generate a display of the spectrum during the transition period that includes the interference signal.