Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 4: Additional Network FeatureShort Data Service (ANF-ISISDS)
The present document defines the Terrestrial Trunked Radio system (TETRA) supporting Voice plus Data (V+D). It specifies:- general design aspects (e.g. reference points, numbering and addressing, or protocol architecture);- the system bearer and mobility management services, and the corresponding air interface protocols;- the interworking between TETRA networks;- the interworking of TETRA networks with other networks, via gateways;- the peripheral equipment interface on the mobile station;- the security protocols and mechanisms applicable to TETRA networks and to TETRA terminal equipment;- the supplementary services applicable to the basic TETRA tele- or be