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In this paper, we present a new collision-free MAC protocol-Carrier Sense Media Access with ID Countdown (CSMA/IC) for ad hoc wireless networks that can achieve 100% collision-free performance by solving the "hidden terminal" problem and the concurrent sending problem. Compared to CSMA/CA of IEEE 802.11, it also improves the network's performance in decreasing the average delay of packet sending, dropping discard ratio, and increases the network's throughput significantly. Furthermore, it candoi:10.1109/iscc.2003.1214222 dblp:conf/iscc/YouYH03 fatcat:ntpxm3h255dkrfgnlofwvmg2sa