Wireless Networks

The maturity of wireless transmissions and the popularity of portable computing devices have made the dream of “communication anytime and anywhere ” possible. An ad hoc wireless network is a good choice for fulfilling this dream. An ad hoc wireless network consists of a set of mobile hosts operating without the aid of an established infrastructure of centralized administration. Communication is done through wireless links among mobile hosts through their antennas. Due to concerns such as radio power limitation and channel utilization, a mobile host may not be able to communicate directly with other hosts in a single-hop fashion. In this case, a multihop scenario occurs, in which the packets sent by the source host must be relayed by several intermediate hosts before reaching the destination host. Although military tactical communication is still considered the primary application for ad hoc wireless networks, commercial interest in this type of network continues to grow. Applications such as law enforcement operation, commercial and educational use, and sensor networks are just a few possible commercial examples. There are several technical challenges related to the ad hoc wireless network. In ad hoc wireless networks, the topology is highly dynamic and frequent changes in the topology may be difficult to predict. With th