Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Differentiated Channel Access Scheme for Assuring QoS of Medical Traffic in WLAN-based e-Healthcare Systems

무선랜 기반 e-Healthcare 시스템에서의 의료용 트래픽의 서비스 품질 보장을 위한 채널 접속 차별화 방안

  • Kim, Young Boo (Department of Information and Communication Engineering, Dongguk University-Seoul) ;
  • Park, Eun-Chan (Department of Information and Communication Engineering, Dongguk University-Seoul)
  • 김영부 (동국대학교-서울 컴퓨터정보통신공학부) ;
  • 박은찬 (동국대학교-서울 컴퓨터정보통신공학부)
  • Received : 2014.02.04
  • Accepted : 2014.04.01
  • Published : 2014.06.01
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Abstract

The IEEE 802.11e EDCA (Enhanced Distributed Channel Access) mechanism has been proposed to improve the QoS (Quality of Service) of various services in WLANs (Wireless Local Area Networks). By differentiating the channel access delay depending on ACs (Access Categories), this mechanism can provide the relative service differentiation among ACs. In this paper, we consider that WLAN is deployed in medical environments to transfer medical traffic and we reveal that the quality of the medical traffic (in particular, ECG signals) is significantly deteriorated even with the service differentiation by IEEE 802.11e EDCA. Also, we analyze the reason for performance degradation and show that IEEE 802.11e EDCA has difficulty in protecting the transmission opportunity of high-priority traffic against low-priority traffic. In order to assure medical-grade QoS, we firstly define the service priority of medical traffic based on their characteristics and requirements, and then we propose the enhanced channel access scheme, referred to as DIFF-CW. The proposed scheme differentiates CW (Contention Window) depending on the service priority and modifies the channel access procedure for low-priority traffic. The simulation results confirm that the DIFF-CW scheme not only assures the QoS of medical traffic but also improves the overall channel utilization.

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