Intercepting User Equipment for 3GPP Direct Mode Lawful Interception
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Solution Overview
Problem
In 3GPP direct mode communication networks, lawful interception of communications between mobile stations is challenging because data exchanged directly between stations is not processed or stored in the backend network, making it difficult for authorized users to obtain communication data.
Innovation Solution
A network device and core network system that registers for intercepting communications between mobile stations, retrieves communication data, and stores it, including a method where user equipment adjusts transmission power to ensure effective interception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile stations exchange data directly in 3GPP direct mode communication network, then communication efficiency is improved, but lawful interception capability deteriorates
Solution Approach 1:
The patent introduces an intercepting user equipment as an intermediary node in the direct mode communication. This intercepting UE positions itself between the communicating UEs and the network, allowing it to capture and forward communication data to the backend network for lawful interception purposes, thus maintaining both direct communication efficiency and interception capability
Solution Approach 2:
The patent implements a nested architecture where the intercepting user equipment is embedded within the direct mode communication system. The intercepting UE nests itself into the existing communication链路, allowing it to access and forward data without disrupting the primary communication path between the target UEs
2Loss of energy
If data is exchanged directly between mobile stations without backend network processing, then network load is reduced, but data accessibility for authorized users deteriorates
Solution Approach 1:
The intercepting user equipment serves as a mediator that receives data from the direct mode communication and forwards selected data to the backend network. This allows the network to maintain low load for routine communications while still gaining access to data when interception is authorized
Solution Approach 2:
The system performs preliminary registration and authorization actions before actual interception. The intercepting UE registers with the network in advance, and authorization decisions are made beforehand, allowing the system to prepare for data collection without continuously processing all direct mode communications through the backend
Data Source
AI summary
An intercepting user equipment and a lawful interception method thereof are provided. The intercepting user equipment registers to the administrating server for lawful interception, and then receives a positive interception message from the administrating server. The intercepting user equipment receives a signal from user equipment, and determines whether a power measurement of the signal exceeds a threshold. If positive, the intercepting user equipment transmits a power adjustment request to the administrating server so that the administrating server notifies the eNB of transmitting a power adjustment command to the user equipment for adjusting transmitting power. The intercepting user equipment intercepts communication data of the user equipment.