Lawful Interception Codec Detection for Wideband Signal Capture
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Solution Overview
Problem
Lawful Interception systems fail to detect and extract information transmitted over the wideband spectrum in calls using the AMR-WB codec, potentially missing critical communication due to the extended frequency range being missed at the Law Enforcement Monitoring Facility (LEMF).
Innovation Solution
Implementing new functions to monitor and notify the LEMF when an AMR-WB codec is negotiated or terminated in an end-to-end call, using specific events and messages (e.g., IRI-CONTINUE) to ensure complete capture of call content, including wideband information, by integrating with existing Intercept Mediation and Delivery Units in telecommunication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the LEMF monitors calls using traditional narrowband interception methods, then the interception system can detect and extract call information, but it fails to capture wideband spectrum information transmitted over AMR-WB codec calls
Solution Approach 1:
The patent changes the monitoring parameter from narrowband frequency range to wideband frequency range by detecting the AMR-WB codec type and adjusting the interception bandwidth accordingly. The LEMF modifies its monitoring parameters to match the codec being used, enabling capture of wideband information when AMR-WB is detected.
Solution Approach 2:
The interception system dynamically adapts its monitoring capabilities based on the detected codec type. The system transitions from static narrowband monitoring to dynamic wideband monitoring when AMR-WB codec is identified, allowing the interception capability to flexibly adjust to different codec configurations.
2Loss of information
If the LEMF implements wideband monitoring for AMR-WB calls, then complete call content including wideband information can be captured, but the complexity of the interception system increases
Solution Approach 1:
The system uses feedback from codec type detection to control the monitoring bandwidth. The LEMF receives information about the codec being used and adjusts its monitoring parameters accordingly, creating a closed-loop system that automatically configures itself based on the detected codec type rather than requiring manual configuration.
Solution Approach 2:
The interception system automatically detects the codec type and configures its own monitoring parameters without external intervention. The LEMF self-adjusts its bandwidth and monitoring settings based on the detected AMR-WB codec, reducing the need for complex external configuration and control mechanisms.
3Loss of information
If the LEMF monitors all frequency ranges continuously, then all call information can be captured, but energy consumption and processing load increase significantly
Solution Approach 1:
The monitoring bandwidth is dynamically adjusted based on the detected codec type. Instead of continuously monitoring all frequency ranges, the system transitions to monitoring only the relevant bandwidth (narrowband or wideband) based on the active codec, reducing unnecessary processing and energy consumption while maintaining complete information capture.
Solution Approach 2:
The system changes its monitoring parameters (bandwidth, frequency range) based on the detected codec type. When AMR-WB is detected, the system expands monitoring to wideband frequencies; when narrowband codecs are used, it maintains narrowband monitoring, optimizing resource usage according to actual requirements.
Data Source
AI summary
Embodiments of the present invention include methods and arrangements to detect an end-to-end call on a AMR-WB capable network involving at least one monitored identity. According to an embodiment of the invention, call events related to the at least one monitored identity through at least one intercepting control element in a telecommunication network is monitored. A start notification message by the at least one intercepting control element is delivered whenever an AMR-WB codec is chosen in the telecommunication network as a selected codec for an end-to-end call between the at least one monitored identity and another identity.