Journal of the Korea Convergence Society (한국융합학회논문지)

Korea Convergence Society (한국융합학회)
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Implementation of Smart Home Network System based on CoAP/6LoWPAN in Mobile Environment

모바일 환경에서 CoAP/6LoWPAN 기반의 스마트 홈네트워크 시스템 구현 및 성능 분석

  • Lee, Bo-Kyung (Department of Computer Engineering, Korea Polytechnic University)
  • 이보경 (한국산업기술대학교 컴퓨터공학부)
  • Received : 2018.08.09
  • Accepted : 2018.11.20
  • Published : 2018.11.28
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Abstract

As the Internet of Thing(IoT) technology recently has become a big issue, many researches have been carried out to link the Internet of things with the home network system. Various home network systems are being implemented to connect many devices used in the home with the Internet and to control and operate the devices using a smart phone. However, existing protocols that operate on the Internet are not suitable for a limited environment such as low power, low capacity, and low performance. Therefore, the Internet Engineering Task Force (IETF) Working Group proposed the CoAP/6LoWPAN technology as a suitable protocol for internetworking IoT devices with the Internet in a limited environment and adopting it as a standard. In this paper, a smart home network system is implemented to control and operate various IoT devices in a home using CoAP/6LoWPAN in mobile environment. The performance of HTTP and CoAP such as data transmission time, data transmission rate is analyzed.

사물인터넷(Internet of Thing) 기술이 커다란 이슈로 떠오르면서 홈 네트워크 시스템을 사물인터넷 기술 과 연동하기 위한 연구들이 많이 진행되고 있다. 특히 가정에서 사용되는 많은 기기들을 인터넷과 연결시키고 스마트 폰을 이용하여 기기들을 제어하고 동작시키기 위한 다양한 기술들이 제안되고 있다. 그러나 기존의 인터넷 프로토콜들은 적은 양의 데이터가 송수신되는 사물 인터넷 환경에는 비효율적이다. 그래서 IETF(Internet Engineering Task Force)에서는 저전력, 저용량, 저성능 등 제한된 환경에서 인터넷과 연동하여 사물들을 동작시키기 위한 대표적인 기술로 CoAP/6LoWPAN 프로토콜을 제안하고 있다. 본 논문에서는 CoAP/6LoWPAN을 이용하여 모바일 환경에서 홈네트워크 시스템을 동작시키고 제어하는 시스템을 구현하였으며 이는 향후 각 가정에 도입될 스마트홈네트워크 시스템 구축에 활용할 수 있을 것으로 전망된다. 또한 기존 인터넷 망에서 사용되는 HTTP와의 성능 분석을 수행하여 CoAP/6LoWPAN 프로토콜을 사용한 제안 시스템이 사물인터넷 환경에 적합함을 보여주고 있다.

Keywords

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Fig. 1. Integrated System Configuration

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Fig. 2. Protocol Stack

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Fig. 3. Home Network System

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Fig. 4 Action Screen of CoAP Client

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Fig. 5 Process of CoAP GET message

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Fig. 6. Process of CoAP PUT message

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Fig. 7. Transmission Times of CoAP and HTTP

Table 1. Sensor Tag's IPv6 Address of each rooms

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Table 2 IPv6 address of Home Network system

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Table 3. Communication rules between CoAP server and sensor

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