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Sensors 2012, 12(11), 14692-14710; doi:10.3390/s121114692

Variable Scheduling to Mitigate Channel Losses in Energy-Efficient Body Area Networks

1,2,* , 2,*  and 3
1 Networks Research Group, School of IT, The University of Sydney, Eveleigh, NSW 2006, Australia 2 National ICT Australia, 13 Garden Street, Eveleigh, NSW 2015, Australia 3 School of Computer Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
* Authors to whom correspondence should be addressed.
Received: 11 July 2012 / Revised: 16 October 2012 / Accepted: 19 October 2012 / Published: 2 November 2012
(This article belongs to the Special Issue Body Sensor Networks for Healthcare and Pervasive Applications)
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We consider a typical body area network (BAN) setting in which sensor nodes send data to a common hub regularly on a TDMA basis, as defined by the emerging IEEE 802.15.6 BAN standard. To reduce transmission losses caused by the highly dynamic nature of the wireless channel around the human body, we explore variable TDMA scheduling techniques that allow the order of transmissions within each TDMA round to be decided on the fly, rather than being fixed in advance. Using a simple Markov model of the wireless links, we devise a number of scheduling algorithms that can be performed by the hub, which aim to maximize the expected number of successful transmissions in a TDMA round, and thereby significantly reduce transmission losses as compared with a static TDMA schedule. Importantly, these algorithms do not require a priori knowledge of the statistical properties of the wireless channels, and the reliability improvement is achieved entirely via shuffling the order of transmissions among devices, and does not involve any additional energy consumption (e.g., retransmissions). We evaluate these algorithms directly on an experimental set of traces obtained from devices strapped to human subjects performing regular daily activities, and confirm that the benefits of the proposed variable scheduling algorithms extend to this practical setup as well.
Keywords: body area networks; TDMA; energy efficiency; reliability; variable scheduling body area networks; TDMA; energy efficiency; reliability; variable scheduling
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Tselishchev, Y.; Boulis, A.; Libman, L. Variable Scheduling to Mitigate Channel Losses in Energy-Efficient Body Area Networks. Sensors 2012, 12, 14692-14710.

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