이동 애드혹 네트워크(MANET: Mobile Ad hoc Network)는 별도의 인프라 없이 다수의 노드들이 무선통신을 이용하여 데이터를 전달하는 차세대 무선 네트워킹 기술이다. 일반적으로 망 토폴로지의 변화가 작은 환경에는 proactive 라우팅 방식이 적합하고, 노드의 이동에 따른 망 토폴로지의 변화가 큰 환경에는 reactive 라우팅 방식이 적합하다. 그러나 이동 애드혹 네트워크의 많은 응용분야에서 이동 노드들은 항상 움직이는 게 아니라, 이동 후 일정한 지역 내에 오랫동안 머물렀다가 다시 이동하는 패턴을 보인다. 따라서 본 논문에서는 노드의 이동성을 고려하는 reactive와 proactive 방식을 혼합한 새로운 hybrid 라우팅 방안(MAHR: Mobility-Aware Hybrid Routing)을 제안한다. 제안 방안은 기본적으로 reactive 라우팅 방식을 사용하며 이웃 노드 수의 변화율을 기반으로 core node를 선정한다. 선정된 core node는 자신의 라우팅 테이블을 proactive 하게 유지한다. 제안 방안의 성능 분석은 random way point 와 Levy walk 이동성 모델을 기반으로 ns-2 시뮬레이션을 통해 기존 방안에 비해 패킷 전달률과 라우팅 오버헤드에서 우수함을 보였다.
KSP Keywords
Hybrid Routing, Levy Walk, Mobile Ad-Hoc Networks(MANET), Mobility-aware, Network simulator-2(NS2)
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