scope:

The present document defines the mobility management of interworking at the Inter-System Interface (ISI) for Terrestrial Trunked Radio (TETRA) system supporting Voice plus Data (V+D). The TETRA V+D Inter-working - basic operation part defines the Inter-System Interface (ISI) between the SwMIs as specified in the following sub-parts: - Additional Network Feature - Inter-System Interface General Description (ANF-ISIGD); - Additional Network Feature - Inter-System Interface Individual Call (ANF-ISIIC); - Additional Network Feature - Inter-System Interface Group Call (ANF-ISIGC); - Additional Network Feature - Inter-System Interface Short Data Service (ANF-ISISD); - Additional Network Feature - Inter-System Interface Mobility Management (ANF-ISIMM).