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Ad hoc Wireless Network (AWN) is a collection of mobile hosts forming a temporary network on the fly, without using any fixed infrastructure. QoS (Quality of Service) is the idea that transmission rates, error rates, and other characteristics can be measured, improved, and to some extent guaranteed in advance in ad hoc network, however, in particular concern for the continuous transmission of high bandwidth video and multimedia information this kind of content dependably transmitting is difficult in public networks using ordinary "Best effort" protocols. Medium Access Control (MAC) protocols are responsible for coordinating the access from active nodes. Carrier Sense Multiple Access (CSMA) refers to a family of protocols used by stations contending for access to a shared medium like an Ethernet cable or a radio channel.
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