In this paper, a mobile network is combined with backbone structure to form a hierarchical ad hoc network. Usually, a mobile ad hoc network is assumed to be homogeneous such that each mobile node uses the same radio capability. However, a homogenous ad hoc network suffers from poor scalability. In this thesis we establish a physical (not logical) hierarchical network to solve this problem in which backbone nodes are employed to transmit for long distance using larger radio power at high tier and cluster structure is used to efficiently utilize resources in a wide and dynamic network. We propose a cluster head determination scheme based on the degree variations of nodes. The nodes with minimum degree variation in the neighborhood are considered more stable and will be selected as the cluster heads. The cluster heads form the backbone nodes and other nodes are the cluster members. The information of cluster members and the nodes in neighboring clusters are recorded in a table of cluster head. According to the information, we have the knowledge of whether the destination node is close to the source node and can determine how to route the transmission. Routing is divided into low tier and high tier routing to relieve the workload of backbone network. The simulation results demonstrate that the proposed hierarchical routing in two tiers (HRTT) improves some problems occurred in the flat network.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0111105-182354 |
| Date | 11 January 2005 |
| Creators | Liao, Chun-kai |
| Contributors | Shie-Jue Lee, Chu-Sing Yang, Tsang-Ling Sheu, Tsung-Chuan Huang, Chung-Nan Lee |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0111105-182354 |
| Rights | unrestricted, Copyright information available at source archive |
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