G.5 MCPTT emergency alert state
24.3793GPPMission Critical Push To Talk (MCPTT) call controlProtocol specificationRelease 18TS
Table G.5-1provides the semantics of the MCPTT emergency alert (MEA) state values. This is an internal state of the MCPTT client and is managed by the MCPTT client. These states aid in the managing of the information elements of MCPTT emergency group calls and MCPTT emergency alerts and their cancellations.
Table G.5-1: MCPTT emergency alert state
|
MCPTT emergency alert state values |
State-entering events |
Comments |
|
MEA 1: no-alert |
initial state emergency alert cancelled emergency alert request denied |
emergency alerts can be cancelled in several ways: MCPTT emergency alert cancel request with <alert-ind> set to "false" (by initiator) MCPTT emergency alert cancel request with <alert-ind> set to "false" (by authorised user) MCPTT emergency group call cancel request with <alert-ind> set to "false" MCPTT emergency state: may be set or clear, depending on MCPTT emergency call status |
|
MEA 2: emergency-alert-confirm-pending |
emergency alert request sent |
emergency alerts can be requested in several ways: MCPTT emergency alert request with <alert-ind> set to "true" MCPTT emergency group call request with <alert-ind> set to "true" MCPTT emergency state: is set |
|
MEA 3: emergency-alert -initiated |
emergency alert response (success) received |
MCPTT emergency state: is set |
|
MEA 4: emergency-alert-cancel-pending |
emergency alert cancellation request sent by alert originator |
MCPTT emergency state: is clear |