(A) fast on-demand QoS routing in Ad Hoc wireless networks

Abstract

In mobile ad hoc networks, all communication is done over wireless media without the help of wired base stations. Since direct communication is allowed only between adjacent nodes, distant nodes communicate over multihops. So, the QoS routing in this network is difficult and the mobility of nodes makes it go bad to worse. The QoS routing schemes based on DSDV routing protocol require an extra bandwidth for exchanging QoS information, so are not proper to ad hoc networks. On-demand QoS-based routing schemes have the drawback of delay time to discover a route that can be quite large. Thus, they are not applicable to real time traffic, particularly in fast moving network. In this thesis, we propose a fast on-demand QoS routing protocol with the two-way reservation scheme (TRS) and partial rerouting with grouping scheme (PRGS) to achieve small route discovering delay time and repairing delay time. As expectation, the simulation results show the dramatically reduced delay times and the effects. Because the delay times are very small, this protocol has high success rate compared with other on-demand protocols and so increases overall throughput. Thus, it is applicable to real time traffic in ad hoc networks. Especially, in large size and fast moving network this protocol obtains distinction.