본 논문에서는 다수의 소규모 그룹 멀티캐스트 통신을 위해 제안된 XMIP라는 명시적 모바일 멀티캐스트를 설계하고 구현한다. XMIP는 유니캐스트 라우팅 정보에 기초한 명시적 멀티캐스트의 특징을 상속받아 멀티캐스트 상태유지가 필요없는 간단한 멀티캐스트 메커니즘이다. 본 연구에서는 IETF Mobile IP의 각 이동 에이젼트들을 XMIP와의 연동을 고려하여 수정하고 확장한다. 확장 홈에이젼트로 전송된 XMIP 패킷들은 확장 홈에이젼트의 바인딩 테이블을 참조하여 X-in-X이라는 중첩 터널을 통해 확장 지역에이젼트들로 전송된다. X-in-X 터널링 메커니즘은 Mobile IP 멀티캐스트 트래픽 집중 문제를 효과적으로 해결할 수 있다. 마지막으로 CDMA2000 1X EV-DO 및 무선랜을 포함하는 이종 모바일 네트워크 환경을 기반으로 XMIP 실험망을 구축하고, 소규모 그룹 통신을 위한 다중 사용자 인스턴트 메신저를 개발하여 실험함으로써 제안하는 프로토콜들의 실효성을 검증한다.
KSP Keywords
Mobile IP(MIP), cdma2000 1x EV-DO
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