Lawful Interception Chain Interface for 5G Network Efficiency
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Solution Overview
Problem
Current lawful interception systems in network service providers face inefficiencies due to redundant information transmission and separate interfaces for interception-related information (IRI) and communication content (CC), leading to high computational costs, bandwidth inefficiencies, and complex correlation processes, especially in 5G networks with increased data volumes and new services.
Innovation Solution
Implementing a unique interface and data flow using a 'chain' mechanism where packets related to a service session are transmitted with a chain identifier (chainID), sequence number, and either IRI or CC, eliminating redundant headers and enabling simultaneous transmission of IRI and CC, thereby reducing redundancy and improving bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate interfaces (HI2 for IRI, HI3 for CC) are used to transmit interception-related information and communication content, then the information can be delivered to the LEA, but the bandwidth efficiency deteriorates and redundant information is transmitted
Solution Approach 1:
The patent merges the separate HI2 and HI3 interfaces into a single unified interface (HI) that carries both IRI and CC. This is achieved by creating a chain structure where packets containing IRI, CC, or both are transmitted through one interface using a common protocol with chain headers that include chainID and sequence numbers for correlation.
Solution Approach 2:
The unified interface HI is designed to be multi-functional, capable of carrying different types of information (IRI, CC, or both) in a single transmission channel. The interface uses a universal packet structure that can accommodate various information types while maintaining efficient bandwidth utilization through intelligent packet construction.
2Reliability
If separate interfaces (HI2 for IRI, HI3 for CC) are used, then information can be transmitted, but the device complexity increases due to multiple mediation functions and interfaces
Solution Approach 1:
The patent consolidates multiple mediation functions (MF2 for IRI, MF3 for CC) and delivery functions into a single mediation function MF that handles both IRI and CC through the unified interface HI. This merging reduces the number of separate components and simplifies the overall system architecture while maintaining the ability to process and transmit different information types.
3Reliability
If separate interfaces with redundant headers are used for IRI and CC, then information can be delivered, but the computational cost increases for correlation and post-processing
Solution Approach 1:
The patent extracts the redundant header information from separate IRI and CC transmissions and replaces it with a single chain header structure. The chain header contains essential correlation information (chainID, sequence numbers) that enables efficient matching of IRI and CC packets without requiring separate header processing for each information type, thereby reducing computational overhead.
Solution Approach 2:
The patent uses chainID as a copying mechanism to reference and correlate IRI and CC packets belonging to the same communication session. Instead of transmitting full header information repeatedly, the system copies the chainID into each packet's header, enabling efficient correlation through simple identifier matching rather than complex header analysis.
4Loss of energy
If a unified chain interface is used to transmit IRI and CC simultaneously, then bandwidth efficiency improves and redundancy is reduced, but the packet structure complexity increases
Solution Approach 1:
The patent segments the unified packet structure into distinct functional components: chain headers (with chainID and sequence numbers), IRI portions, and CC portions. This segmentation allows the system to maintain a unified interface for bandwidth efficiency while organizing information in a structured, manageable way that simplifies processing and correlation at the receiving end.
Data Source
AI summary
Methods and devices employed in providing lawful interception (LI) by products related to a service session of an LI target as a unique chain. The packets sent to a legal enforcement agency are chained and have shorter headers. The number of packets is reduced by including both intercept-related information (IRI) and content of communications (CC) in the same packet if time-wise appropriate.