RF Ingress Detection via Cable Modem MER Analysis
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Solution Overview
Problem
Cable and wireless communication networks face interference from external RF signaling, particularly from LTE networks, due to spectral overlap, leading to service degradation and difficulty in actively measuring interference across large network areas.
Innovation Solution
A passive and non-intrusive assessment tool using cable modem measurements collected by a Cable Modem Termination System (CMTS) to identify areas of RF ingress, predict small cell placement, and mitigate interference by analyzing signal-to-noise ratio (SNR) values and modulation error rates, facilitating the detection of LTE interference and other RF sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active measurement of RF interference is performed across physical portions of the network, then measurement precision is improved, but device complexity and cost increase due to requiring technicians to physically engage with network portions
Solution Approach 1:
The patent uses cable modems as intermediary devices already deployed in the network to perform ingress measurements. Instead of requiring technicians to physically access network portions with specialized equipment, the system leverages existing cable modems to collect MER data, which is then processed by the CMTS to determine ingress levels. This intermediary approach maintains measurement precision while eliminating the need for complex portable measurement systems and technician field access.
Solution Approach 2:
The system creates a virtual copy of the physical network measurement capability by using software-based analysis at the CMTS. Rather than physically measuring RF signals at multiple network locations, the system replicates the measurement function through data collection and processing of MER information from cable modems, transforming physical measurement requirements into informational analysis that can be performed remotely.
2Area of stationary object
If the network size is increased to cover larger areas, then service coverage is improved, but difficulty of detecting and measuring ingress increases due to the network being too large for technicians to actively engage
Solution Approach 1:
The system enables self-service ingress detection where cable modems automatically collect and report their own MER data to the CMTS without requiring technician intervention. Each cable modem serves itself by monitoring its received signal quality and transmitting this information upstream, allowing the network to autonomously detect and locate ingress problems across large geographic areas without human field engagement.
Solution Approach 2:
The patent divides the large network into manageable segments by analyzing ingress at the level of individual cable modems or small groups of modems. Instead of attempting to measure the entire network as one unit, the system segments the measurement task into discrete cable modem locations, each reporting its own ingress conditions. This segmentation allows technicians to identify specific problem areas within large networks without needing to physically access every portion.
3Adaptability or versatility
If cable and mobile networks share the same spectrum at the same time, then spectrum utilization is improved, but object-affected harmful factors increase due to RF interference between the networks
Solution Approach 1:
The system implements feedback by continuously monitoring MER data from cable modems and using this information to identify ingress caused by LTE interference. The CMTS analyzes the feedback data to determine which cable modems are experiencing interference, calculates ingress levels, and can provide this information to network operators for mitigation. This feedback mechanism enables the network to adapt to co-channel interference by identifying and locating problematic areas.
Solution Approach 2:
The patent replaces physical RF signal analysis with informational data analysis. Instead of using spectrum analyzers or other electronic measurement devices to detect interference, the system substitutes these mechanical/electronic systems with software-based analysis of MER data. This substitution allows the network to detect and respond to RF interference from mobile networks without requiring additional hardware or physical intervention in the RF environment.
Data Source
AI summary
An assessment tool for assessing signaling ingress and small cell placement within a communication network is contemplated. The assessment tool may include capability sufficient for assessing signaling ingress associated with radio frequency (RF) signaling attenuating, influencing or otherwise interfering with other signaling being transmitted over a communication network.