Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 2: Additional Network Feature Individual Call (ANF-ISIIC) (V1.4.1)
The present document defines the Terrestrial Trunked Radio (TETRA) system 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 Line Station (LS) interface with TETRA networks; ? the security protocols and mechanisms applicable to TETRA networks and to TETRA terminal equipment; ? the supplementary services applicable to the basic TETRA tele- or bearer services. The TETRA V+D interworking - basic operation part defines the interworking between TETRA networks over the corresponding interface: the Inter-System Interface (ISI). It comprises the following subparts: ? ISI general design; ? Additional Network Feature - ISI Individual Call (ANF-ISIIC); ? Additional Network Feature - ISI Group Call (ANF-ISIGC); ? Additional Network Feature - ISI Short Data service (ANF-ISISDS); ? Additional Network Feature - ISI Mobility Management (ANF-ISIMM); ? 8 kbit/s encoding of user information at the ISI. The present document is the ANF-ISIIC sub-part. ANF-ISIIC enables calls to be set-up by a user registered in one TETRA network to another user registered in another TETRA network@ operating at the ISI of both SwMIs. It also supports call restoration when a user has migrated to another TETRA network during an established call. Additionally@ ANF-ISIIC allows TETRA signalling information to be passed from a TETRA SwMI to another TETRA SwMI supporting the TETRA individual call procedures as defined in clauses 11 and 14 of EN 300 392-2 [1]. Like all other Additional Network Feature (ANF) specifications@ those of ANF-ISIIC are produced in three stages@ according to the method described in ITU-T Recommendation I.130 [i.5]. The present document contains the stage 1 and 2 descriptions of ANF-ISIIC@ and its partial stage 3 description. The stage 1 description specifies the ANF as seen by its users@ which are essentially the individual call control entities in both TETRA networks. The stage 2 description identifies the functional entities involved in the ANF and the information flows between them. And the partial stage 3 description of ANF-ISIIC specifies its protocol. NOTE: According to ITU-T Recommendation I.130 [i.5]@ the stage 3 description of a bearer or tele-service addresses the network implementation aspects. Consequently@ it comprises two steps: the specifications of all protocols at the various reference points involved in any of the service procedures (notably the service operation) are the first step of the stage 3 description@ and the specifications of the functions of the corresponding network entities are its second step. The latter have not been provided since they can be derived from the specification of the functional entity actions in the stage 2 description. The present document applies to TETRA networks which support inter-TETRA individual calls. More specifically@ it applies to their Circuit Mode Control Entities (CMCE)@ as defined in clause 14.2 of EN 300 392-2 [1]@ and to their ANF-ISIIC entities defined in the stage 2 description.