DocumentCode :
87784
Title :
WiCop: Engineering WiFi Temporal White-Spaces for Safe Operations of Wireless Personal Area Networks in Medical Applications
Author :
Yufei Wang ; Qixin Wang ; Guanbo Zheng ; Zheng Zeng ; Rong Zheng ; Qian Zhang
Author_Institution :
Dept. of Comput., Hong Kong Polytech. Univ., Hong Kong, China
Volume :
13
Issue :
5
fYear :
2014
fDate :
May-14
Firstpage :
1145
Lastpage :
1158
Abstract :
ZigBee and other wireless technologies operating in the (2.4GHz) ISM band are being applied in Wireless Personal Area Networks (WPAN) for many medical applications. However, these low duty cycle, low power, and low data rate medical WPANs suffer from WiFi co-channel interferences. WiFi interference can lead to longer latency and higher packet losses in WPANs, which can be particularly harmful to safety-critical applications with stringent temporal requirements, such as ElectroCardioGraphy (ECG). This paper exploits the Clear Channel Assessment (CCA) mechanism in WiFi devices and proposes a novel policing framework, WiCop, that can effectively control the temporal white-spaces between WiFi transmissions. Such temporal white-spaces can be utilized for delivering low duty cycle WPAN traffic. We have implemented and validated WiCop on SORA, a software-defined radio platform. Experimental results show that with the assistance of the proposed WiCop policing schemes, the packet reception rate of a ZigBee-based WPAN can increase by up to 116% in the presence of a heavy WiFi interferer. A case study on the medical application of WPAN ECG monitoring demonstrates that WiCop can bound ECG signal distortion within 2% even under heavy WiFi interference. An analytical framework is devised to model the CCA behavior of WiFi interferers and the performance of WPANs under WiFi interference with or without WiCop protection. The analytical results are corroborated by experiments.
Keywords :
biomedical communication; distortion; electrocardiography; personal area networks; radiofrequency interference; safety; software radio; telecommunication channels; telecommunication traffic; wireless LAN; CCA behavior; CCA mechanism; ECG signal distortion; SORA; WPAN ECG monitoring; WPAN traffic; WiCop policing schemes; WiFi devices; WiFi interference; WiFi interferers; WiFi transmissions; ZigBee-based WPAN; clear channel assessment; electrocardiography; engineering WiFi temporal white-spaces; medical applications; packet losses; packet reception rate; policing framework; safe operations; safety-critical applications; software-defined radio platform; temporal requirements; wireless personal area networks; wireless technologies; Electrocardiography; IEEE 802.11 Standards; Monitoring; Spread spectrum communication; Wireless communication; Wireless personal area networks; Wireless sensor networks; Algorithm/protocol design and analysis; Communication/Networking and Information Technology; Computer Systems Organization; Mobile Computing; Mobile communication systems; Software-defined radio; coexistence;
fLanguage :
English
Journal_Title :
Mobile Computing, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1233
Type :
jour
DOI :
10.1109/TMC.2013.31
Filename :
6477043
Link To Document :
بازگشت