IMS 망에서 PTT 서비스의 호 설정 및 통화 성능향상을 위한 프로토콜 압축 기법

Abstract

In the world most of mobile communication Co. were suggested formation management that can unify wire/wireless, voice/movie/data, and communication/broadcasting/subnet in 3GPP by the possibility that is transmission of fest multimedia data through wireless packet network. it seems that communication companies will be able to develop more easily and cost-efficiently various multi media service and highly new service by using IMS network. one of these new service is PTT depended on IMS network. PTT is service through communication network developing internet environment to unify wire/wireless for offering voice and communication using text for one to one or group. PTT can communicate immediately with speaking pushing switch just meaning of word, so it can offer relatively fast service when compared withwaiting time of general call. In the IMS network for servicing PTT have call setup same as TRS network and Mobile network that is compatibilization now and should be enough call setup and using frequency resource of call. When servicing PTT in IMS network, call setup use SIP and after completing it, call setup use RTP. SIP and RTP is protocol that ismade for multimedia commnication and in case SIP have big message over 1000 byte, in case RTP we can know that size of header is bigger than size of voice data. In this paper, suggested A+SigComP, A+ROHC that is algorithm, Protocol compression method, for callsetup time and call bandwidth that is improve ability of PPT service and appraised A+SieComP, A+ROHC ability by experiment