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2008 The 4th International Conference on Mobile Ad-hoc and Sensor Networks (2008)
Dec. 10, 2008 to Dec. 12, 2008
ISBN: 978-0-7695-3457-2
pp: 271-275
In wireless sensor networks (WSNs), a duty-cycling scheme is typically applied to the medium access control (MAC) protocol to reduce energy consumption due to idle listening. However, this scheme introduces huge end-to-end latency and still suffers from a large control packet overhead. We propose a new MAC protocol with low latency and low control overhead for WSNs use (the LCO-MAC). In our protocol, a DATA packet can be transmitted through multiple hops in a single duty cycle to shorten end-to-end latency. To reduce energy consumption caused by control packet overhead, we force one packet to play more than one role. In the initial transmission period, a control packet acts as an RTS (request to send) for a downstream node and a CTS (clear to send) for an upstream node. In the actual data transmission period, a DATA packet keeps its original DATA role for the downstream node, but also plays an ACK (acknowledgment) role for the upstream node. Our simulation using ns-2 has shown that LCO-MAC enables a notable improvement in energy efficiency and decreases end-to-end latency compared to those of RMAC.
wireless sensor network, energy efficiency, MAC protocol, packet overhead, latency

K. Nguyen and Y. Ji, "LCO-MAC: A Low Latency, Low Control Overhead MAC Protocol for Wireless Sensor Networks," 2008 The 4th International Conference on Mobile Ad-hoc and Sensor Networks(MSN), vol. 00, no. , pp. 271-275, 2008.
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