LTE Interference Detection via Signal Statistics
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Solution Overview
Problem
Fourth-Generation Long Term Evolution (LTE) networks face significant interference issues due to passive intermodulation (PIM) and other sources, which degrade performance, leading to lower throughput, dropped calls, and traffic congestion, particularly in co-located base-station environments where the likelihood of interference increases.
Innovation Solution
A method and system for monitoring, detecting, and mitigating interference in LTE communication systems, involving the conversion of uplink signals to CPRI signals to identify various interference sources and utilizing adaptive filtering and interference suppression techniques to remove interference, including PIM, from CDMA carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SC-FDMA is used for LTE uplink to reduce power consumption, then power consumption decreases, but susceptibility to interference increases
Solution Approach 1:
The patent converts the harmful interference into a detectable signal characteristic by analyzing the statistical properties of received signals. The system identifies interference by detecting deviations from expected signal statistics, transforming the harmful interference into a detectable anomaly that can be flagged and addressed.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that analyzes signal statistics between the transmitter and receiver. This intermediary layer processes the received signals to identify interference characteristics without requiring changes to the SC-FDMA modulation scheme, thus maintaining power efficiency while adding interference protection.
2Productivity
If multiple transmitters are co-located to increase network capacity, then network capacity increases, but passive intermodulation interference increases
Solution Approach 1:
The patent implements a feedback mechanism where the base station continuously monitors received signals for interference characteristics and identifies PIM sources. The system uses statistical analysis of signal properties to detect intermodulation products and provides feedback information about interference levels and locations, enabling network optimization to maintain capacity while reducing interference impact.
3Reliability
If interference monitoring and detection systems are added to identify and mitigate interference, then interference mitigation improves, but system complexity increases
Solution Approach 1:
The patent enables the communication system to self-diagnose interference problems by analyzing statistical properties of received signals. The base station autonomously detects interference characteristics, identifies PIM sources, and generates reports without requiring external monitoring equipment or complex additional hardware, thus improving reliability while minimizing complexity increase.
Data Source
AI summary
A system that incorporates aspects of the subject disclosure may perform operations including, for example, receiving, via an antenna, a signal generated by a communication device, detecting passive intermodulation interference in the signal, the interference generated by one or more transmitters unassociated with the communication device, and the interference determined from signal characteristics associated with a signaling protocol used by the one or more transmitters. Other embodiments are disclosed.