10.5.3 Interworking floor control

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

3GPP TS 23.379 [7], subclause 10.9.1.4.1 describes floor control involving groups in multiple MCPTT systems where floor control arbitration resides with the primary MCPTT server and all floor control messages are routed to that primary MCPTT server. The group is homed on the primary MCPTT server.

An interworking group can be homed on the MCPTT server or on the LMR system. When the group is homed on the MCPTT server the floor control server is on this MCPTT server. When the group is homed on the LMR system the floor control server is represented by the IWF.

The primary MCPTT system of an MCPTT group is defined by configuration and identified by the MC service group ID.

3GPP TS 23.379 [7], subclause 10.9.1.4.2 describes floor control involving groups in multiple MCPTT systems where the partner MCPTT system filters its MCPTT users’ floor requests before communicating with the floor control server of the primary MCPTT system. When an MCPTT system is interworking with an IWF, depending on where the group is homed the MCPTT server, or the IWF can filter floor control requests in the same way as an interconnected MCPTT system.

In a private call, one of the IWF or MCPTT server acts as the controlling floor control server within the call, and manages arbitration of floor control requests received from both users in the call. The entity (MCPTT server or IWF) that does not fulfil the controlling role shall send all floor control requests from its served call participant to the controlling floor control server without filtering.

NOTE: Allocation of controlling floor control server functionality to the MCPTT server or IWF may be according to the system within which the call originated, or by some other means.