Lawful Interception (LI) is one of the regulatory requirements operators must satisfy as a legal obligation toward the Law Enforcement Agencies (LEA) and Government Authorities in most countries where they are operating their businesses. Within 3GPP standards, this is currently defined as: Laws of individual nations and regional institutions (e.g. European Union), and sometimes licensing and operating conditions define a need to intercept telecommunications traffic and related information in modern telecommunications systems. It has to be noted that lawful interception shall always be done in accordance with the applicable national or regional laws and technical regulations (as per 3GPP TS 33.106 “Lawful Interception Requirements"
LI allows appropriate authorities to perform interception of communication traffic for specific user(s) and this includes activation (requiring a legal document such as a warrant), deactivation, interrogation, and invocation procedures. A single user (i.e. interception subject) may be involved where interception is being performed by different LEAs. In such scenarios, it must be possible to maintain strict separation of these interception measures. The Intercept Function is only accessible by authorized personnel. As LI has regional jurisdiction, national regulations may define specific requirements on how to handle the user’s location and interception across boundaries
The process of collection of information is done by means of adding specific functions into the network entities where certain trigger conditions will then cause these network elements to send data in a secure manner to a specific network entity responsible for such a role. Moreover, specific entities provide administration and delivery of intercepted data to Law Enforcement in the required format.
How it is done on a packet data network ? That is using Gateways
The packet data network gateway (PDN-GW) ensures connectivity to the UE to outer packet data networks, as it represents the EPC’s point of contact with the external world. A mobile could have simultaneous connectivity with several PDN-GWs for accessing multiple packet data networks. The PDN-GW is responsible for several functions such as packet filtering, charging support, policy enforcement, packet screening, IP address allocation for the UE, QoS enforcement and lawful interception. The PDN-GW acts also as the anchor for mobility between 3GPP and non-3GPP technologies such as WiMAX [13].
References:
https://www.sciencedirect.com/topics/computer-science/lawful-interception
LI allows appropriate authorities to perform interception of communication traffic for specific user(s) and this includes activation (requiring a legal document such as a warrant), deactivation, interrogation, and invocation procedures. A single user (i.e. interception subject) may be involved where interception is being performed by different LEAs. In such scenarios, it must be possible to maintain strict separation of these interception measures. The Intercept Function is only accessible by authorized personnel. As LI has regional jurisdiction, national regulations may define specific requirements on how to handle the user’s location and interception across boundaries
The process of collection of information is done by means of adding specific functions into the network entities where certain trigger conditions will then cause these network elements to send data in a secure manner to a specific network entity responsible for such a role. Moreover, specific entities provide administration and delivery of intercepted data to Law Enforcement in the required format.
How it is done on a packet data network ? That is using Gateways
The packet data network gateway (PDN-GW) ensures connectivity to the UE to outer packet data networks, as it represents the EPC’s point of contact with the external world. A mobile could have simultaneous connectivity with several PDN-GWs for accessing multiple packet data networks. The PDN-GW is responsible for several functions such as packet filtering, charging support, policy enforcement, packet screening, IP address allocation for the UE, QoS enforcement and lawful interception. The PDN-GW acts also as the anchor for mobility between 3GPP and non-3GPP technologies such as WiMAX [13].
References:
https://www.sciencedirect.com/topics/computer-science/lawful-interception
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