3 세대 이동통신 시스템인 UMTS/GPRS 는 모든 MS(Mobile Station)에게 인터넷 서비스를 항상 제공할 수 있도록 하는 것을 목표로 하고 있다. 그러나 최근 인터넷 사용의 증가로 인해 public IPv4 주소 부족 현상이 발생함에 따라 인터넷에 연결되어 있는 모든 MS 에게 public IPv4 주소를 할당하는데 한계가 있다. 이에 따라 3GPP의 Release 2000 IM CN(IP Multimedia Core Network) 서브 시스템에서는 멀티미디어 서비스 지원을 위해 인터넷에 연결되어 있는 모든 MS 에게 IP 를 할당할 수 있도록 IPv6 지원을 필수로 정의하고 있다. 따라서 UMTS/GPRS 에서 IPv6 를 지원할 경우 이동망과 인터넷망간의 패킷 서비스 전달을 위해 게이트웨이 기능을 수행하는 GGSN 에서 가장 큰 변화가 이루어질 것이다. 그러므로 본 논문에서는 GGSN 이 dual stack 을 지원해야하는지에 대해 살펴본 후 UMTS/GPRS 프로토콜 구조를 제안한다. 그리고 IPv6 지원을 위해 GGSN의 기능을 설계하고 GTP 메시지와 IPv6 주소 할당 방법에 대해 살펴본다.
KSP Keywords
Core Network, Mobile station(MS), dual stack
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