Comparison of Different Broadcast Schemes for Multi-Hop Wireless Sensor Networks

The IEEE 802.11 standard is widely used and deployed in wireless systems. IEEE 802.11 MAC protocol allows multiple nodes to share the wireless medium without any central coordinator. If two nodes that are nearby each other transmit frames at the same time, the frames collide and the channel bandwidth will not utilized. The MAC protocol tries to avoid this situation using a mechanism called Multiple Sensing Access with Collision Avoidance (CSMA/CA). CSMA/CA mechanism first listen the channel for a particular duration (a slot time), whenever a node wants to transmit data frame. If the channel is ideal for a particular duration, the node transmits the data frame.

Provided by: Inha University Topic: Mobility Date Added: Jul 2010 Format: PDF

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