B.2.2 Deactivation

03.333G security3GPPLawful InterceptionStage 2TS

The following picture shows the information flow for the deactivation of the Lawful interception.

B.2.2.1 X1_1p-interface

The messages sent from the ADMF to the GSN for deactivation contains:

– the identity of the target;

– IA in case of location dependent interception.

Figure B6: Information flow on X1_1p-interface for Lawful Interception deactivation

If interception of a target has been activated via different identities then a separate deactivation message will need to be sent from the ADMF to the GSN for each identity.

When several LEAs requested activation on the same identity and subsequently request deactivation then the ADMF determines that there are remaining activations on the identity. In this case, the ADMF will not send a deactivation message to the GSN except when the activation needs to change from IP and IRI to IP only or IRI only. In that case an activation change message will be sent to the GSN.

B.2.2.2 X1_2p-interface (IRI)

The ADMF sent for the deactivation to the Delivery Function 2 of the Intercept Related Information:

– a DF2P activation id, which uniquely identifies the activation to be deactivated for DF2P.

If a target is intercepted by several LEAs and/or several identities simultaneously, a single deactivation is necessary for each combination of LEA and identity.

Figure B7: Information flow on the X1_2p-interface for Lawful Interception deactivation

B.2.2.3 X1_3p-interface (IP)

For the deactivating the delivery of the IP the message from the ADMF to the Delivery Function contains:

– a DF3P activation id, which uniquely identifies the activation to be deactivated for DF3P.

If a target is intercepted by several LEAs and/or several identities simultaneously, a single deactivation is necessary for each combination of LEA and identity.

Figure B8: Information flow X1_3p-interface for Lawful Interception deactivation