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Delay-Tolerant Sensor Networks (DTSN) experience long, unpredictable latency under fluctuating wireless networks with intermittent connectivity. Energy consumption and throughput improvement are essential in the design of MAC for DTSNs. However, when latency is relaxed in DTSN environments, traditional metrics such as throughput and energy consumption cannot express the transmission efficiency and...
In this paper, we propose a new Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) called MMSMAC (Multi-Mode Sensor MAC protocol), which can operate and switch among three modes: synchronous, asynchronous, and hybrid, according to the application requirements. In the synchronous mode, MMSMAC organizes the sensor nodes under even and odd clusters. Each sensor node has its own...
Radio-frequency (RF) based recharging of sensor nodes is a promising way to reduce maintenance and extend the operational life of wireless sensor networks. However RF attenuation causes the network nodes with largest distance from the access point (master node) to dictate the rate of recharging which imposes unnecessary breaks in the operation of nodes closer to the master. This deteriorates the throughput...
In a Wireless Sensor Network (WSN), Medium Access Control (MAC) protocol is a key component to extend the lifetime of the WSN consisting of sensor nodes. Receiver-Initiated MAC (RI-MAC) is designed to reduce the energy consumed in the idle listening. RI-MAC may not spend energy efficiently since the data frame may collide frequently in the heavy traffic condition. We have proposed the Receiver-initiated...
In this paper, we propose a novel energy fairness mechanism based on relay selection for cooperative MAC protocol. By changing the method of cooperation nodes selection, a round robin scheme is adopted to choose a relay node from all qualified nodes. The new mechanism improves the fairness of energy consumption of cooperation nodes, and studies the tradeoff between fairness of energy consumption and...
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