title: CoR-MAC: Contention over Reservation MAC Protocol for Time-Critical Services in Wireless Body Area Sensor Networks.
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.
authors.affiliation: School of Computer Science and Engineering, Chung-Ang University, 221 Heukseok, Dongjak, Seoul 156-756, Korea. jsyu@uclab.re.kr.
authors.forename: Jeongseok
authors.initials: J
authors.lastname: Yu
authors.affiliation: School of Computer Science and Engineering, Chung-Ang University, 221 Heukseok, Dongjak, Seoul 156-756, Korea. lhpark@uclab.re.kr.
authors.forename: Laihyuk
authors.initials: L
authors.lastname: Park
authors.affiliation: School of Computer Science and Engineering, Chung-Ang University, 221 Heukseok, Dongjak, Seoul 156-756, Korea. jhpark@uclab.re.kr.
authors.forename: Junho
authors.initials: J
authors.lastname: Park
authors.affiliation: School of Computer Science and Engineering, Chung-Ang University, 221 Heukseok, Dongjak, Seoul 156-756, Korea. srcho@cau.ac.kr.
authors.forename: Sungrae
authors.initials: S
authors.lastname: Cho
authors.affiliation: Electronics and Telecommunications Research Institute, 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea. cskeum@etri.re.kr.
authors.forename: Changsup
authors.initials: C
authors.lastname: Keum
keywords: priority level; urgent data; wireless body area sensor networks