Journal of Korea Multimedia Society (한국멀티미디어학회논문지)

Korea Multimedia Society (한국멀티미디어학회)
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Performance Evaluation of CoAP-based Internet-of-Things System

CoAP 기반 사물인터넷 시스템 성능평가

  • Choo, Young Yeol (Dept. of Computer & Media Eng., Graduate School, Tongmyong University) ;
  • Ha, Yong Jun (Dept. of Computer & Media Eng., Graduate School, Tongmyong University) ;
  • Son, Soo Dong (Dept. of Computer & Media Eng., Graduate School, Tongmyong University)
  • Received : 2016.11.08
  • Accepted : 2016.12.06
  • Published : 2016.12.30
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Abstract

Web presence is one of the key issues for extensive deployment of Internet-of-Things (IoT). An obstacle to overcome for Web presence is relatively low computing power of IoT devices. In this paper, we present implementation of an IoT platform based on Constrained Application Protocol (CoAP) which is a web transfer protocol proposed by Internet Engineering Task Force (IETF) for the low performance IoT devices such as Wireless Sensor Network (WSN) nodes and micro-controllers. To qualify the performance of CoAP-based IoT system for such an application as smart grid, we designed a test platform consisting of Raspberry Pi2, Kmote WSN node and a desktop PC. Using open source softwares, CoAP was implemented on top of the platform. Leveraging the GET command defined at CoAP specification, performance of the system was measured in terms of round-trip time (RTT) from web application to the Kmote sensor node. To investigate abnormal cases among the test results, hop-by-hop delays were measured to analyze resulting data. The average response time of CoAP-based communication except the abnormal data was reduced by 23% smaller than the previous research result.

Keywords

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