Journal of Internet Computing and Services (인터넷정보학회논문지)

Korean Society for Internet Information (한국인터넷정보학회)
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Wireless Channel Selection Considering Network Characteristics in Cluster-based Sensor Networks

클러스터 기반 센서 네트워크에서의 네트워크 특성 정보를 고려한 무선 채널 선택 기법

  • Received : 2014.10.27
  • Accepted : 2015.04.17
  • Published : 2015.04.30
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Abstract

To provide scalability, wireless sensor network has cluster-based architecture. Wireless sensor network can be implemented based on the IEEE 802.15.4 which is exploited in 2.4GHz ISM frequency band. Since this frequency band is used for various data communication, network status of wireless sensor networks frequently changes according to wireless environment. Thus, wireless channel selection to avoid reduction of transmission efficiency is required. This paper estimates network status using the information that a cluster-head collects in a cluster. Through objective function with throughput, RSSI level and reliability as input parameters, this paper proposes proper wireless channel selection. Simulation results show that the proposed method maintains transmission efficiency even though network status changes.

무선 센서 네트워크의 구현에 활용되는 IEEE 802.15.4 표준은 이기종 통신 기술들이 공존하는 2.4 GHz ISM 대역을 기반으로 동작하며, 수시로 변하는 네트워크 상태로 인한 간섭을 회피한 전송 효율의 향상과 네트워크의 상태를 고려한 채널 선택 기술이 요구된다. 무선 센서 네트워크는 다수의 센서 노드로 구성되어 있으며, 확장성을 위해 클러스터 기반의 네트워크 구조를 가지며, 싱크 노드는 각 클러스터들의 네트워크 특성정보를 수집하고 주기적 쿼리 메시지 발송을 통해 이 정보들을 네트워크 필드 내 클러스터 헤드들과 공유한다. 본 논문에서는 클러스터 헤드가 수집한 네트워크 정보를 기반으로 클러스터 내에서의 네트워크 상태를 파악하고, 계량화된 처리량 (throughput) 레벨, 수신신호강도 (RSSI) 레벨, 그리고 신뢰성 (reliability)을 파라미터로 하는 목적함수를 통해 적절한 무선채널을 클러스터에서 선택하는 방안을 제안한다. 제안된 방안이 네트워크 상태 변화에서도 데이터 전송 효율을 유지할 수 있음을 컴퓨터 시뮬레이션을 통해 검증하였다.

Keywords

References

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