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Title: WiCop : engineering WiFi temporal white-spaces for safe operations of wireless body area networks in medical applications
Authors: Wang, Y
Wang, Q 
Zeng, Z
Zheng, G
Zheng, R
Keywords: WBAN
Issue Date: Dec-2011
Publisher: IEEE Computer Society
Source: 2011 IEEE 32nd Real-Time Systems Symposium (RTSS), Nov. 29-Dec. 2 2011, p.170-179 How to cite?
Abstract: ZigBee and other wireless technologies operating in the (2.4GHz) ISM band are being applied in Wireless Body Area Networks (WBAN) for many medical applications. However, these low duty cycle, low power, and low data rate medical WBANs suffer from WiFi co-channel interferences. WiFi interference can lead to longer latency and higher packet losses in WBANs, which can be particularly harmful to safety-critical applications with stringent temporal requirements. Existing solutions to WiFi-WBAN coexistence either require modifications to WiFi or WBAN devices, or have limited applicability. In this paper, by exploiting the Clear Channel Assessment (CCA) mechanisms in WiFi devices, we propose a novel policing framework, WiCop, that can effectively control the temporal white-spaces between WiFi transmissions. Specifically, the WiCop Fake-PHY-Header policing strategy uses a fake WiFi PHY preamble-header broadcast to mute other WiFi interferers for the duration of WBAN active interval, while the WiCop DSSS-Nulling policing strategy uses repeated WiFi PHY preamble (with its spectrum side lobe nulled by a band-pass filter) to mute other WiFi interferers throughout the duration of WBAN active interval. The resulted WiFi temporal white-spaces can be utilized for delivering low duty cycle WBAN traffic. We have implemented and validated WiCop on SORA, a software defined radio platform. Experiments show that with the assistance of the proposed WiCop policing schemes, the packet reception rate of a ZigBee-based WBAN can increase by up to 43.8% in presence of a busy WiFi interferer.
ISSN: 1052-8725
DOI: 10.1109/RTSS.2011.23
Rights: © 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
The following publication Wang, Y., Wang, Q., Zeng, Z., Zheng, G., & Zheng, R. (2011, November). Wicop: Engineering wifi temporal white-spaces for safe operations of wireless body area networks in medical applications. In Real-Time Systems Symposium (RTSS), 2011 IEEE 32nd (pp. 170-179) is available at
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