TITLE:
Control Access Point of Devices for Delay Reduction in WBAN Systems with CSMA/CA
AUTHORS:
Akinobu Nemoto, Pham Thanh Hiep, Ryuji Kohno
KEYWORDS:
Standard IEEE802.15.6, Discrete Time Markov Chain Method, Control Access Point, Bandwidth Efficiency, Delay
JOURNAL NAME:
Communications and Network,
Vol.7 No.1,
January
29,
2015
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.