Abstract
Reserving time slots for urgent data, such as life-critical information, seems to be very attractive to guarantee their deadline requirements in wireless body area sensor networks (WBASNs). On the other hand, this reservation imposes a negative impact on performance for the utilization of a channel. This paper proposes a new channel access scheme referred to as the contention over reservation MAC (CoR-MAC) protocol for time-critical services in wireless body area sensor networks. CoR-MAC uses the dual reservation; if the reserved time slots are known to be vacant, other nodes can access the time slots by contention-based reservation to maximize the utilization of a channel and decrease the delay of the data. To measure the effectiveness of the proposed scheme against IEEE 802.15.4 and IEEE 802.15.6, we evaluated their performances with various performance indexes. The CoR-MAC showed 50% to 850% performance improvement in terms of the delay of urgent and time-critical data according to the number of nodes.
Highlights
Spurred by the rapid convergence of key technologies, such as physiological sensors, wireless communication and low power micro-electro-mechanical systems (MEMS), a new generation of wireless body area sensor networks (WBASNs) is emerging
We addressed the problem of the delay of urgent data and time-critical data
To reduce the delay of urgent data transmission, we proposed a contention over reservation MAC protocol for WBASNs
Summary
Spurred by the rapid convergence of key technologies, such as physiological sensors, wireless communication and low power micro-electro-mechanical systems (MEMS), a new generation of wireless body area sensor networks (WBASNs) is emerging. There have been a large number of studies on priority-based mechanisms [1,2,3,4,5,6] in wireless networks These mechanisms are not applicable to WBASNs, since they are not designed for a WBASN’s unique features of low-power, reliability and the accommodation of diverse traffic types, including emergency alarms. For WBASNs, the few proposals for urgent data transmission in terms of priority-based MAC can be classified into three categories: parametric [13,14,15], channelization-based [16,17,18,19] and hybrid [20,21].
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