NGN 환경에서 다양한 무선 액세스 기술들이 통합됨에 따라 다중 인터페이스를 탑재한 이동 단말들이 등장하고 있다. IEEE 및 IETF에서는 이종 무선 액세스망간 핸드오버를 지원하기 위한 기술을 제안하고 표준화를 진행하고 있다. IEEE의 경우 IEEE802.21 MIH를 제안하여 L2이상의 핸드오버를 처리하기 위한 기능 구조 및 시그널링 절차에 대해 표준화를 진행하고 있다. IETF의 경우 기존 네트워크 기반 이동성 지원 방안(PMIP)에서 다중 인터페이스 단말을 수용하기 위한 네트워크 구조 및 이에 따른 문제를 해결하기 위해 NETEXT WG를 구성하여 관련 문제에 대해 연구 및 표준화를 진행하고 있으며, MIF WG에서는 다중 인터페이스 단말에 대한 실용 기술과 표준 내용간의 차이점을 분석하고 있다. 본 고에서는 네트워크 기반 이동성 지원 네트워크 구조에서 다중 인터페이스 단말을 수용하기 위한 표준 현황 및 기술 동향에 대해 살펴본다.
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