WLAN Interworking specifications (TS 23.234
, TS 24.234
and TS 29.234
) are no longer maintained for Release 12 onwards.
This clause 9
is therefore no longer maintained.
Figure 23 shows the extract from the reference configuration which is relevant for the invocation of the Lawful Interception of the packet data 3GPP WLAN Interworking network.
The HI2 and HI3 interfaces represent the interfaces between the LEA and two delivery functions. Both interfaces are subject to national requirements. They are included for completeness, but are beyond the scope of this specification.
The delivery functions are used:
to convert the information on the X2-interface to the corresponding information on the HI2 interface;
to distribute the intercept related information to the relevant LEA(s);
to distribute the intercept product to the relevant LEA(s).
Interception at a WAG applies for the roaming users where the PDG is not in the visited network.
For most WLAN Interworking cases, the Packet Data Gateway (PDG) handles the bearer level interception, specifically interception of CC and IRI related to tunnel establishment and release in which case there is no need to perform interception at a WAG. This includes the case where the PDG is in the intercepting carrier's network (whether it be home or visited). For the case where a visited network is to intercept WLAN related tunnel and the PDG for the tunnel is not in the visited network, the Wireless Access Gateway (WAG) is used to intercept the CC and IRI related to tunnel establishment and release. It should be noted that the CC available at the WAG may be encrypted.