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Sensors 2013, 13(6), 7308-7322; doi:10.3390/s130607308
Article

An Optimized Handover Scheme with Movement Trend Awareness for Body Sensor Networks

1,* , 2
, 3
 and 1
1 Department of Electrical and Computer Engineering, National University of Singapore, Singapore 119613, Singapore 2 Department of Computing, Imperial College, London SW7 2AZ, UK 3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
* Author to whom correspondence should be addressed.
Received: 28 March 2013 / Revised: 26 May 2013 / Accepted: 29 May 2013 / Published: 3 June 2013
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in the UK 2013)
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Abstract

When a body sensor network (BSN) that is linked to the backbone via a wireless network interface moves from one coverage zone to another, a handover is required to maintain network connectivity. This paper presents an optimized handover scheme with movement trend awareness for BSNs. The proposed scheme predicts the future position of a BSN user using the movement trend extracted from the historical position, and adjusts the handover decision accordingly. Handover initiation time is optimized when the unnecessary handover rate is estimated to meet the requirement and the outage probability is minimized. The proposed handover scheme is simulated in a BSN deployment area in a hospital environment in UK. Simulation results show that the proposed scheme reduces the outage probability by 22% as compared with the existing hysteresis-based handover scheme under the constraint of acceptable handover rate.
Keywords: localization; handover; body sensor network localization; handover; body sensor network
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Sun, W.; Zhang, Z.; Ji, L.; Wong, W.-C. An Optimized Handover Scheme with Movement Trend Awareness for Body Sensor Networks. Sensors 2013, 13, 7308-7322.

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