Control Access Point of Devices for Delay Reduction in WBAN Systems with CSMA/CA

Akinobu Nemoto¹, Pham Thanh Hiep², Ryuji Kohno²

¹Department of Medical Informatics, Yokohama City University, Yokohama, Japan.
²Division of Physics, Electrical and Computer Engineering, Yokohama National University, Yokohama, Japan.

DOI: 10.4236/cn.2015.71001                

Abstract

Due to the gathering of sickrooms and consultation rooms in almost all hospitals, the performance of wireless devices system is deteriorated by the increase of collision probability and waiting time. In order to improve the performance of wireless devices system, relay is added to control the access point and then the access of devices is distributed. The concentration of access point is avoided and then the performance of system is expected to be improved. The discrete time Markov chain (DTMC) is proposed to calculate the access probability of devices in a duration time slot. The collision probability, throughput, delay, bandwidth and so on are theoretically calculated based on the standard IEEE802.15.6 and the performance of the system with and without relay is compared. The numerical result indicates that the performance of the system with control access point is higher than that of the system without control access point when the number of devices and/or packet arrive rate are high. However, the system with control access point is more complicated. It is the trade-off between the performance and the complication.

Keywords

Standard IEEE802.15.6, Discrete Time Markov Chain Method, Control Access Point, Bandwidth Efficiency, Delay

Conflicts of Interest

The authors declare no conflicts of interest.

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