| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系碩士班 === 91 === A wireless mobile ad hoc network, or mobile ad hoc network (MANET) for short, is a wireless network composed of a group of mobile hosts. MANET does not require a fixed infrastructure; moreover, every mobile host on the MANET can serve as a router. Two mobile hosts in such a network can communicate directly with each other through a single-hop route in the shared wireless media if their positions are close enough. Otherwise, they need a multi-hop route to finish their communications. In a multi-hop route, the packets sent by a source are relayed by multiple intermediate hosts before reaching their destination. MANET can be applied to such occasions as short festivals, battlefield communication, and disaster relief. MANET plays a significant role in places without wired infrastructures.
Most of the mobile hosts on MANET operated on batteries, which contain limited power. When a routing protocol is designed without taking into account power consumption, two undesirable phenomena will occur during the operation of the MANET. The first one is that every mobile host on the MANET will consume power heavily and the MANET’s lifetime is shortened seriously. The second is the uneven consumption. In other, certain mobile hosts can consume power faster than other mobile hosts. It is obvious that the routes that travel through there powerless hosts will be cut off. When this happens in many places, the whole MANET will become unstable and end up suffering shortened lifetime.
Existing power-aware MANET routing protocols in literature includes MTPR, MBCR, MMBCR, CMMBCR, MRPC, CMRPC, MDR and CMDR, etc. The proposed routing protocols are based on the specific power-metric to judge the superiority of the existing paths. In some network models, these judgments cannot select the feasible routing path that extends the lifetime of the network. Therefore, the goal of this thesis is to study and design a high-performance power-aware routing protocol under the prevailing mobile ad-hoc networks. Except for the analysis of power and QoS metric, we also proposed the conception of lifetime of the network. Further, based on this conception, we will design a high-performance QoS routing protocol (Selected Minimal Drain Rate Routing, SMDR). The mathematical calculations and computer simulations prove that SMDR can decrease the consumption rate of the total power to extend the network lifetime in general network model.
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