지금까지 센서노드에 TCP/IP를 운용하는 것은 과도한 시스템 자원을 요구하기 때문에 부적절한 선택이라고 생각해 왔다. 그러나, 최소한의 기능만을 가진 TCP/IP를 센서 노드에 적용하여도 센서노드가 동작할 수 있으므로 센서 네트워크에 IP 기술을 접목시키려는 연구가 진행되고 있고, 이에 대한 표준 기술의 필요성이 대두되게 되었다. IETF 6LoWPAN WG는 L2 Layer에 IEEE 802.15.4를 기반으로 하는 센서 네트워크에 IPv6를 지원하기 위한 이슈를 다루는 그룹으로서 저전력, 20~250kbps의 데이터 전송률, 900~2400MHz의 주파수 대역에서 최소형 메모리와 최소형 프로세서만을 장착한 센서 응용을 대상으로 하고 있다. 이 그룹은 국제 표준화 기구 중 대표적으로 IP 기반의 센서 네트워크에 대한 표준 기술을 다루고 있는 그룹으로서, 우리나라에서 6LoWPAN 기술은 USN 기술에 IP를 도입한 IP-USN이라는 개념으로 소개되어 연구 개발되고 있다. 본 고에서는 6LoWPAN WG에서 개발한 표준 기술을 소개하고, 향후 WG의 표준화 방향에 대하여 살펴본다.
KSP Keywords
IEEE 802.1, IP-USN
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