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In this paper, the authors propose RR-MAC, a Medium-Access Control (MAC) protocol used for sensor networks. Wireless sensor networks uses battery power to sense the devices. It consists of spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure and to cooperatively pass the data through the network to a main location. These characteristics of sensor networks and applications motivate a MAC that is different from traditional wireless MACs such as IEEE 802.11 in almost every way: energy conservation and self-configuration are primary goals, while per-node fairness and latency are less important.