Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol (V1.3.0)
The multi-part deliverable EN 300 396 defines the TErrestrial Trunked RAdio (TETRA) Direct Mode Operation (DMO). It specifies the basic air interface@ the inter-working between Direct Mode (DM) groups via repeaters@ and inter-working with the TETRA Voice plus Data (V+D) system via gateways. It also specifies the security aspects in TETRA DMO@ and the intrinsic services that are supported in addition to the basic bearer and teleservices. The present document applies to the TETRA DMO Mobile Station - Mobile Station (MS-MS) air interface and contains the specifications of the Data Link Layer (DLL) and the network layer according to the ISO model. It establishes the services@ messages and protocols used for voice and circuit mode data calls and short data transfer@ starting with the upper layers: it defines and specifies the protocol used by the layer 3 entity to communicate across the air interface; it defines and specifies the services and protocol used in the DLL. The normative annexes mainly specify the parameter values used in the protocol.