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Tackling the exposed node problem in IEEE 802.11 MAC

Deepanshu Shukla


Ad hoc wireless networks promise convenient infrastructure-free communication. An efficient MAC protocol through which mobile stations can share a common broadcast channel is essential in an ad-hoc network because the medium or channel is a scarce resource. The basic medium access mechanism is basically a Carrier Sense Multiple Access with Collision Avoidance mechanism (CSMA/CA). The CSMA/CA protocol is designed to reduce the collision probability between multiple stations accessing a medium. 802.11 MAC forestalls the possibility of feasible parallel communication by two neighboring nodes that are either both senders or both receivers giving rise to ?Exposed Node? problem. Exposed Nodes are the nodes which are forced to defer the transmission of data as it is already exposed to an ongoing tranmission. This work adds enhancements to IEEE 802.11 MAC which enables it to schedule concurrent transmissions, thereby improving the channel utilization and solving the Exposed Node problem.

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