Abstract:

In order to optimize media traffic through push to talk over cellular (PoC)4 i nterface in Internet protocol (IP) multimedia subsystem, an improved optimizati on mechanism is presented by taking loosecoupling and distributedcontrolling ideas into consideration. Under the new mechanism, the media traffic through Po C4 interface can be reduced greatly, and the network bandwidth can be saved mu ch and waiting delay of realtime transport protocol packages in PoC serv er can also be shortened obviously. Analysis and simulation show that the new me chanism performs more effectively than do the original transmitting mechanism an d the media traffic optimization mechanism proposed by open mobile alliance.

Key words: Internet protocol multimedia subsystem, push to talk over cellular, media traffic optimization, distributed controlling, loose coupling