Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Performance Evaluation and Enhancement of Transmission Technique in Wireless Sensor Networks

무선센서네트워크에서 성능측정을 통한 전송방식의 문제점 분석 및 개선

  • 임동선 (한국전자통신연구원) ;
  • 이좌형 (강원대학교 컴퓨터정보통신공학과) ;
  • 정인범 (강원대학교 컴퓨터정보통신공학)
  • Received : 2009.10.13
  • Accepted : 2009.10.28
  • Published : 2010.05.31
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Abstract

Sensor network is used to obtain sensing data in various area. The interval to sense the events depends on the type of target application and the amounts of data generated by sensor nodes are not constant. Many applications exploit long sensing interval to enhance the life time of network but there are specific applications that requires very short interval to obtain fine-grained, high-precision sensing data. If the number of nodes in the network is increased and the interval to sense data is shortened, the amounts of generated data are greatly increased and this leads to increased amount of packets to transfer to the network. To transfer large amount of packets fast, it is necessary that the delay between successive packet transmissions should be minimized as possible. In this paper, we propose SET(SendDoneEventbasedTransmission Technique)which reduces the delay between successive packet transmissions by using SendDone Event which informs that a packet transmission has been completed. In SET, the delay between successive packet transmissions is shortened very much since the transmission of next packet starts at the time when the transmission of previous packet has completed, irrespective of the transmission time. Therefore SET could provide high packet transmission rate given large amount of packets.

주변환경에서 정보를 수집하는 센서네트워크는 다양한 분야에서 사용되고 있다. 정밀한 분석을 위하여 매우 짧은 주기로 정보를 수집할 필요가 있는 어플리케이션에서는 네트워크를 구성하는 노드의 수가 증가하고 정보를 수집하는 주기가 짧아질수록 생성되는 데이터의 양도 증가하기 때문에 노드 간에 지연을 최소화하여 효율성을 높일 필요가 있다. 본 논문에서는 네트워크 구성시 데이터 전송률에 영향을 미치는 전송주기와 센서 노드간의 거리, 전송 패킷의 크기에 대한 실험을 실시하여 실험한 결과를 바탕으로 주기적 전송 기법의 한계와 문제점을 분석하고 패킷 전송 작업이 완료되었음을 알려주는 전송 완료 이벤트를 이용하여 연속적인 패킷 전송시 지연을 줄여주는 SET(SendDone Eventbased Transmission Technique)기법을 제안한다. SET에서는 패킷 전송이 완료된 시점에 즉시 다음 패킷을 전송하기 때문에 패킷을 전송하는데 소요되는 시간에 상관없이 패킷 전송간에 지연이 발생하지 않는다. 따라서 연속적으로 대량의 패킷을 전송할 때 높은 전송율을 제공할 수 있다.

Keywords

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