Research On The Key Technologies Of MANET Self-Adaptive Architecture

A mobile Ad Hoc network is a self-organized, multi-hop wireless communication network formed by a set of mobile nodes without relying on a fixed infrastructure. With improvement of MANET research process, many new applications are proposed based on different MANET architecture due to its node's flexible self-organzing. Scope of applications is also expended from the initial military to a wider areas, including civilian, scientific and commercial purposes. In MANET, network self-organization is determined by node mobility model and the transmission power. Many proposed classic routing protocols can't reach its best performance on some special network applications due to the adaptive capacity of routing protocols is not enought to adapt changes of network environment. In this paper, by studying the charactristics of MANET network architecture and constructing the reasonable network model, the existing routing protocols are improved and optimized to enhance its performance and adaptive capacity under some special network applications.The main achievements of this paper are as follows:(1) To resolve the problem of communication interference caused by network topology in MANET. Proposed a node-interference based measurement model and designed topology control algorithms in two aspects, one is to minimize maximum interference and the other is to minimize average interference. By the experiment the proposed algorithms are proved to decrease real interference times in network communications.(2) To analyze topology charactristic of delay-tolerant of vehicles of the public transportation system. Based on this characteristic, an abstract topology of DTN is presented and a new communication efficiency weight is defined. An indexing-based multi-level clustering algorithm is proposed to cluster the nodes which have stronger communication capability with each other. A novel DTN routing algorithm IMCR is designed on this cluster construction, in which the cluster information of each node can provide a reference for the routing algorithm to forward packets when two nodes encounter. It is proved by the experiment that based on the pre-cluster information, IMCR is more efficient than other DTN routings used in the high speed public transportation system.(3) To discuss the small world charactristic of topology model in social delay tolerant networks. Construct a topology model based on social tie. Designed a ST-ProPHET routing algorithm which can satisfy the node's selfish in social networks. The proposed routing algorithm can guarantee delivery rate for important messages based on its social tie and decrease risk of DOS attack. (4) To resolve the problem in a large scale social networks because a large number of nodes, the redundant packets which can't be well controlled by routing algorithm will cause the node's packet buffer overflow and drop useful packets. Proposed a cluster structure based topology model simlar with the clustering topology in MANET. The cluster is defined as a closely social circuit. A clustering algorithm is presented in which nodes with similar mobility rules can be clustered in the same social circuit. A routing algorithm CSCR is proposed based on this social circuit architecture, which consist of spray, forward and epidemic phases. The CSCR can effectively control redundant packets, and it is more efficient than other DTN routings used in the high payloads and large scale network scenarios.(5) To analyze the model of MANET and DTN heterogeneous wireless networks. Proposed a hybrid routing schema based on MANET stable enclosure. This schema can transform the routing protocol between MANET and DTN based on the local topology in real time. It fully used the advantage of MANET and DTN routing protocol. By experiment we proved the feasibility of our proposal and proved the proposed algorithm is more efficient than the other DTN routing protocols used in the heterogeneous wireless networks and the heterogeneous network architecture has more powerful survivability than MANET.