10.5.10 Floor control in private call controlled by the MCPTT system

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

Figure 10.5.10‑1 shows a procedure for a private call with floor control where the MCPTT system controls the floor. A request for transmission by the LMR user while the MCPTT user has the floor is accepted by the MCPTT server, to show various aspects of interworking floor control.

Pre-conditions:

1. A private call has been set up between the LMR user and MCPTT client 1.

2. The MCPTT server is controlling the floor.

3. The floor is idle.

Figure 10.5.10-1: Floor control with control by the MCPTT system

1. MCPTT Client 1 requests the floor.

2. The MCPTT server grants the floor to MCPTT Client 1.

3. The MCPTT server informs the IWF that the floor has been granted to MCPTT client 1.

NOTE 1: Step 3 may occur before or after step 2.

4. MCPTT client 1 sends voice media to the MCPTT server (4a) which forwards the voice media to the IWF (4b).

5. The LMR user decides to interrupt the transmission from MCPTT client 1, and the IWF is informed.

6. The IWF sends a floor request to the MCPTT server with sufficient priority to interrupt MCPTT client 1.

7. The MCPTT server decides to allow the interruption from the LMR user, based on the priority of the request and on configuration.

8. The MCPTT server informs MCPTT Client 1 that the transmission permission has been revoked.

9. The floor is granted to the LMR user via the IWF.

NOTE 2: Step 9 may occur before or after step 8.

10. Voice media is sent from the LMR user via the IWF to the MCPTT server (10a) and on to MCPTT client 1 (10b).