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    초록·키워드

    This paper describes an architecture and call flows for asynchronous data and Group 3 facsimile services in CDMA Mobile System. The wireless communication channel is sometimes subject to highly variable quality due to the nature of the radio channel or handoff. We use the IS-99 protocol reference model which is the recommendation for a reliable data transmission For the interface between analog network and wireless cellular network, CDMA Mobile System has an Interworking Function which interworks other networks and supports data retransmission on wireless environments. We design and implement functions of asynchronous data and G3 facsimile services based on IS-99 in CDMA Mobile System. This architecture can provide reliable data transmission for mobile subscribers who use data services. CDMA cellular network We focus on asynchronous data and G3 facsimile services in circuit mode. The IWF has functions as follow, converts analog data to digital data, adapts transmission rate and processes protocol interface. Section 2 presents CDMA Mobile System (CMS, ETRI's developed the digital cellular system) architecture and additional subsystems for data services. Section 3 presents the protocol stack and the reference model based on IS-99 Section 4 describes the architecture of IWF and section 5 describes call handling procedures. Section 6 describes results of our tests and some considerations for data services. Finally section 7 ends with conclusions and further study

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      UCI(KEPA) : I410-ECN-0101-2009-569-013240623