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The authors study the problem of medium access control in domain of event-driven Wireless Sensor Networks (WSN). In this kind of WSN, sensor nodes send data to sink node only when an event occurs in the monitoring area. The nodes in this kind of WSN encounter correlated traffic as a subset of nodes start sending data by sensing a common event simultaneously. They wish to rethink of Medium Access Control (MAC) for this type of traffic characteristics. For WSN, many existing MAC protocols utilize the basic CSMA strategies like 802.11 that uses Binary Exponential Backoff (BEB) algorithm to handle the collisions among packets when more than one node want to access the channel.
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