Core Network Border Element Lawful Interception
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Solution Overview
Problem
Current lawful interception standards fail to provide comprehensive solutions for intercepting bearer traffic in complex communication scenarios, such as call forwarding and interconnection between different core networks, leading to non-compliance with legal requirements.
Innovation Solution
The implementation of core network border elements with interception capabilities that detect the necessity of lawful interception and perform bearer traffic interception by obtaining and checking core network identifiers, using Session Initiation Protocol (SIP) headers to distribute identities and flags, and delegating interception tasks when necessary, ensuring compliance with regulatory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current lawful interception standards are applied, then signaling traffic can be intercepted in core networks, but bearer traffic interception is not provided in complex scenarios such as call forwarding and interconnection between different core networks
Solution Approach 1:
The patent extends the lawful interception functionality to handle multiple traffic types (signaling and bearer traffic) and multiple scenarios (call forwarding, interconnection between different core networks) through a unified interception mechanism at core network border elements, making the system universally applicable to various complex communication scenarios
Solution Approach 2:
The patent introduces core network border elements as intermediary components that facilitate bearer traffic interception in complex scenarios. These border elements act as mediators between different core networks and between signaling and bearer traffic handling, enabling comprehensive interception capabilities where traditional access network elements cannot operate
2Measurement precision
If access network elements are used for interception, then subscriber identities can be supervised, but bearer traffic interception fails in scenarios like call forwarding where intermediate parties are not visible
Solution Approach 1:
The patent shifts the interception dimension from access network level to core network level. By operating at the core network border elements, the system gains visibility into call forwarding chains and intermediate parties that are invisible to access network elements, thereby achieving complete interception while maintaining precise subscriber identification through core network identifiers
3Ease of manufacture
If separate handling of signaling and bearer traffic is used, then current standards can be implemented, but comprehensive lawful interception is not achieved in all scenarios
Solution Approach 1:
The patent merges the handling of signaling traffic and bearer traffic into a unified interception framework. By combining these previously separate handling paths at core network border elements, the system achieves comprehensive lawful interception coverage while maintaining standard compliance through integrated processing
Data Source
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AI summary
There are provided extended provisions of lawful interception of bearer traffic. One corresponding method is operable at a core network border element, and comprises detecting a necessity of lawful interception, and performing lawful interception of bearer traffic in a communication transaction. Another corresponding method is operable at a core network border element, and comprises determining a capability of lawful interception, performing lawful interception of bearer traffic in a communication transaction, if determined to be capable and delegating lawful interception of bearer traffic in a communication transaction to another element, if determined to be incapable.