7 Functional model

23.2833GPPMission Critical Communication Interworking with Land Mobile Radio SystemsRelease 18TS

7.1 General

7.2 Functional model description

Figure 7.2‑1 shows the functional model for the application plane for interworking between MC systems and LMR systems. Functional entities and interfaces depicted on the right-hand side of the IWF‑x interfaces are defined in 3GPP TS 23.280 [5], 3GPP TS 23.379 [7], and 3GPP TS 23.282 [6].

Figure 7.2-1: Functional model for application plane for interworking

7.3 Functional entities description

7.3.1 IWF

The IWF supports most of the functionality of peer MCPTT and MCData systems, with some differences, as specified in the present document. The IWF supports any necessary protocol translation and identity mapping between the MC systems and the IWF. The internal function of the IWF is out of scope of the present document.

7.4 Reference points

7.4.1 Reference point IWF‑1 (between the IWF and the MCPTT server)

The IWF‑1 reference point, which exists between the IWF and the MCPTT server, provides peer to peer interconnection between an LMR system and the MCPTT system. IWF‑1 supports a subset of MCPTT‑3 as defined in 3GPP TS 23.379 [7], with some differences, as specified in the present document. The IWF‑1 interface is supported by the same signalling plane protocol(s) as defined for MCPTT‑3 except as specified in the present document.

7.4.2 Reference point IWF‑2 (between the IWF and the MCData server)

The IWF‑2 reference point, which exists between the IWF and the MCData server, provides SDS interconnection between an LMR system and the MCData system. IWF‑2 supports a subset of the functionality of MCData‑SDS‑1 and MCData‑SDS‑2, as defined in 3GPP TS 23.282 [6] with some differences, as specified in the present document. The IWF‑2 interface is supported by the same signalling plane protocol(s) as defined for MCData‑3 except as specified in the present document.

7.4.3 Reference point IWF‑3 (between the IWF and the group management server)

The IWF‑3 reference point, which exists between the IWF and the group management server, provides group management interconnection between an LMR system and the MC system. IWF‑3 is based upon CSC‑16, as defined in 3GPP TS 23.280 [5] with some differences, as specified in the present document.