scope:

The present document specifies the general aspects of HI2 and HI3 interfaces for handover via IP based networks.

The present document:

• specifies the modular approach used for specifying IP based handover interfaces;

• specifies the header(s) to be added to IRI and CC sent over the HI2 and HI3 interfaces respectively;

• specifies protocols for the transfer of IRI and CC across the handover interfaces;

• specifies protocol profiles for the handover interface.

The present document is designed to be used where appropriate in conjunction with other deliverables that define the service-specific IRI data formats (including TS 102 227 (see "Bibliography"), TS 101 909-20-1 [33], TS 101 909-20-2 [34], TS 102 233 [5] and TS 102 234 [6]). Where possible, the present document aligns with 3GPP TS 33.108 [9] and TS 101 671 [4] and supports the requirements and capabilities defined in TS 101 331 [1] and TR 101 944 [7].

For the handover of intercepted data within GSM/UMTS PS domain, the present document does not override or supersede any specifications or requirements in 3GPP TS 33.108 [9] and TS 101 671 [4].