Patent ID: 7925287

Claim:
A method of requesting and granting a media transmission right of a PTT over Cellular (PoC) user in a PoC system, which includes a PoC client and a PoC server, the method comprising: the PoC client transmitting a media transmission right request (Media Burst Control Protocol (MBCP) Request) message to the PoC server according to a request of the PoC user; the PoC server receiving the MBCP Request message, determining whether a current state corresponds to a media transmission denial condition, and if it is determined that the current state corresponds to a media transmission denial condition, transmitting a media transmission right request denial (MBCP Deny) message containing at least one of time information of a media transmission timer and time information of a retry-after timer to the PoC client; and the PoC client receiving the MBCP Deny message, if the time information of the media transmission timer and the time information of the retry-after timer are contained in the MBCP Deny message, activating the media transmission timer and the retry-after timer using respective time information, and re-transmitting the MBCP Request message to the PoC server if one of the media transmission timer and the retry-after timer, the retry-after timer having a longer time value, expires.