VCC Gateway Lawful Interception Voice Call Continuity
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Solution Overview
Problem
Existing telecommunication networks face challenges in maintaining voice call continuity and lawful interception across different technologies and frequency ranges, leading to call drops or loss of interception data during network-to-network movement.
Innovation Solution
A method and system for voice call continuity (VCC) that involves detecting user movement between networks, reconfiguring network properties, and duplicating voice call data to ensure seamless lawful interception by law enforcement agencies, using a VCC device and gateway to handle different communication protocols and technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a user moves from one telecommunication network to another network during a voice call, then voice call continuity is maintained, but lawful interception capability is lost
Solution Approach 1:
The patent introduces a Lawful Interception Gateway (LIG) as an intermediary component that sits between the telecommunication network and the lawful interception system. This gateway receives voice call data from the network, processes it according to interception policies, and forwards it to the appropriate interception points. The LIG acts as a mediator that maintains interception capability during network transitions by centralizing the interception function and coordinating between different network elements.
Solution Approach 2:
The patent implements preliminary actions by establishing interception parameters and policies before the user moves between networks. The system pre-configures interception points, sets up data duplication mechanisms, and establishes communication protocols with various network elements in advance. This ensures that when network transition occurs, the interception function is already prepared and can be activated without interruption.
2Adaptability or versatility
If different telecommunication networks operate under different frequency ranges and interface protocols, then network diversity and coverage are improved, but lawful interception data delivery becomes unreliable
Solution Approach 1:
The patent creates a universal lawful interception gateway that can operate across multiple telecommunication networks with different technologies and protocols. The LIG is designed with multi-functionality to handle various interface protocols (e.g., GSM, CDMA, WiMAX, Wi-Fi) and frequency ranges. It includes protocol conversion capabilities and can adapt its operation mode based on the specific network technology, enabling a single interception system to serve diverse network environments reliably.
Solution Approach 2:
The system dynamically changes operational parameters based on the detected network type and technology. When a user moves between networks, the LIG modifies interception parameters such as data formats, protocol versions, and communication protocols to match the target network's requirements. This parameter adaptation ensures continuous and reliable data delivery across heterogeneous networks without loss of interception information.
3Productivity
If real-time communication switches from circuit switching to packet based switching, then network flexibility and efficiency are improved, but lawful interception infrastructure complexity increases
Solution Approach 1:
The patent segments the lawful interception function into separate, manageable components. Instead of integrating interception capabilities into every network element, the system divides the interception process into distinct modules: a Lawful Interception Gateway for data collection, a protocol conversion module for format transformation, and an interception point manager for coordination. This segmentation reduces the complexity burden on individual components while maintaining overall system functionality across different switching technologies.
Data Source
AI summary
A system and method for providing lawful interception (LI) data in voice call continuity for telecommunication networks are disclosed. In one embodiment, the data associated with a registered telecommunication network user (i.e., target user) coming from a first telecommunication network is intercepted by a VCC gateway. Further, the intercepted data is sent to the LEA in a format desired by the LEA. Furthermore, the VCC gateway is configured based on a successful determination of network properties associated with the second telecommunication network upon the target user moving to the second telecommunication network. The second telecommunication network is based on a technology that is different from the first telecommunication network. In addition, the data associated with the target user coming from the second telecommunication network is continuously intercepted by the VCC gateway and continuously sent to the LEA by the VCC gateway in the format desired by the LEA.