A method of operating a first terminal that is participating in a Mission Critical Push To Talk (MCPTT) group call in an off-network is to receive an initial floor grant message, which is designed to signal a floor transfer from a second terminal to the third terminal; and storing the Synchronization Source (SSRC) from the third terminal in the first floor grant message as an SSRC for a subsequent floor arbitrator or receiving a media message or a floor control message or floor control message; and, if the transmitter of the media packet or the floor control message is the next floor arbitrator, updating the SSRC for a floor arbitrator as the SSRC of the next floor arbitrator.

This unique concept is connected to Mission Critical Push to Talk (MCPTT), and specifically, the control of a floor in an MCPTT group that is responsible for the MCPTT service without a network.

Recently, special purpose-communication systems for public safety, transportation, and public utilities and industries are being studied. These special purpose-communication systems have to provide group communication services such asPush-to-Talk (PTT) and support services in disaster situations where a communication infrastructure is not supported. A MCPTT service that is based on the 3rd Generation Partnership Project (3GPP) ensures a PTT-based service by allowing direct communication between terminals in the event that a base station and a server cannot function, i.e., in an off-network situation, and describes protocols related to floor control, so that floor control can be carried out without an arbitration server.

The innovative concept offers a method of controlling the floor that can reduce time required to transfer the floor during the course of a Mission Critical Push To Talk (MCPTT) group call in an off-network while allowing the floor to be moved effectively even if a floor arbitrator is not available.

A method for operating an initial terminal equipped to take part in an MCPTT group-call on the off network is described in the context of. This includes: receiving a first floor message that indicates the floor transfer from a second terminal to the third terminal; and saving the Synchronization Source of the third terminal as an SSRC for the next floor arbiter; receiving a media package or a floor control messages in the event that the person who transmits the media package is the next floor administrator updating the SSRC to the floor arbiter of the current floor and converting it into the SSRC the SSRC the floor administrator on the next floor

A sample embodiment describes a method to operate an MCPTT Group which includes multiple terminals that participate in an MCPTT call on an off network. This includes receiving a message indicating a floor transfer from a different terminal that indicates an upcoming floor transfer; sending a floor-taking message to the second terminal as well as all terminals with the exception of the firstterminal; and controlling floor control by the first terminal.

A sample of a procedure for operating an MCPTT Group which includes a plurality terminals. The method involves sending a floor grant message from a first terminal that is a current floor arbitrator from the multitude of terminals. The message contains information about the second terminal to which the floor is transferred. The second terminal is then saved by the first terminus as the current floor arbitrator of the terminal. The other terminals, aside from the second terminal are able to store the first floor arbitrator.

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