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Most of the existing MAC-layer protocols for sensor networks consider the status of wireless channel as time invariant. This assumption leads to reduced energy efficiency due to repeated transmissions particularly in nodes that experience deep channel fading. Multiple factors can be responsible for fading channels including other wireless activity in the surroundings, mobility, and geographic landscape...
In a typical sensor network application scenario, occurrence of an event triggers data collection. In such cases, a mobile sink node moves into the sensing area or a node is activated to serve as a cluster head and collect data from the sensor nodes deployed in the area. In such applications, only the number of nodes in the area is known which makes TDMA-type protocols infeasible. Different data collection...
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