G.7 MCPTT imminent peril group state
24.3793GPPMission Critical Push To Talk (MCPTT) call controlProtocol specificationRelease 18TS
The MCPTT imminent peril group state is the MCPTT client’s perspective of the in-progress imminent peril group state which is managed by the controlling MCPTT function. The MCPTT imminent peril group (MIG) state is managed by the MCPTT client to enable the requesting of MCPTT imminent peril-level priority as early as possible in the origination of an MCPTT imminent peril group call. High-level characteristics of this state are captured in table G.7-1.
Table G.7-1: MCPTT imminent peril group state
|
MCPTT imminent peril group state values |
State-entering events |
Comments |
|
MIG 1: no-imminent peril |
initial state prior to any call activity Imminent peril group call cancel request received on behalf of another user from the MCPTT server Imminent peril group call cancel response (success) in response to initiator’s request |
|
|
MIG 2: in-progress |
Imminent peril group call response received (confirm) to initiator’s imminent peril group call request Imminent peril group call request received (on behalf of another user) |
In this state, all participants in calls on this group will receive imminent peril level priority whether or not they initiated an MCPTT imminent peril group call themselves. |
|
MIG 3: cancel-pending |
Imminent peril group call cancel request sent by initiator |
The controlling MCPTT server may not grant the cancel request for various reasons, e.g., other users in an MCPTT imminent peril state remain in the call. |
|
MIG 4: confirm-pending |
Imminent peril group call request sent by initiator |
The controlling MCPTT server may not grant the call request for various reasons, e.g., the MCPTT group is not configured as being imminent peril-capable so it can’t be assumed that the group will enter the in-progress state. |