Studies On Cross Layer Design Based Broadcasting Algorithms In Mobile Ad Hoc Networks

Mobile Ad Hoc Network is one of the hottest research areas now a day. There are several reasons for this. One of them is its low cost to employ the network. Second is its freedom of location, and third and most important is, it can be installed by any layman. So ad hoc networks have become a promising research field in recent years. This credit also goes to the rapid development and popularity of various mobile devices. Different wireless technologies have been introduced to enable message communications between mobile devices. So when we talk about Mobile Ad Hoc Networks, it is must to talk about the broadcasting. Broadcasting is the basic feature of Mobile Ad Hoc Networks because all the communication among the mobile devices depends on the broadcasting.In this dissertation, my work has focused on improving the efficiency of already presented algorithms. For this purpose we have used the Cross Layer Design. So our main focus is to use Cross Layer Design for improving broadcasting techniques. As layering provides the network design with modularity that facilitates standardization and implementation, and each layer is designed separately with control messages passing between adjacent layers so the idea of cross-layer design is to jointly design these different layers. Cross-layer design can imply a joint design across all network layers simultaneously, which is highly complex. Alternatively, it can entail choosing parameters at different network layers from existing designs in a joint fashion, which is our design approach. In our design approach we have used the parameters of different layers for removing some control message overhead, for collecting the network information more precisely for improving the broadcast efficiency.Thus, in this work, we study a suboptimal iterative method of cross-layer optimization over a subset of the network layers: the MAC layer, Network Layer and the Physical Layer. In particular, to jointly design the MAC protocol, the link design and select the optimal sample period, we first get the information of network layer and physical layer and use these information at MAC layer for adaptation and for optimizing the back off timer.From the experiment results we have proved that Cross Layer Design helps in reducing the broadcast redundancy so as to avoid the broadcast storm problem in MANETs. The aim of algorithms is to reduce the number of retransmission by using Cross Layer metrics for adapting adaptive behavior.This dissertation is supported by National Natural Science Foundation of China (No. 60672137, 90304018), Specialized Research fund for Doctoral Program of higher Education of China (No. 20060497015), and Key Project of Wuhan, Hubei Province of China (No. 20041001001).