| Summary: | 碩士 === 國立中央大學 === 資訊管理研究所 === 98 === As wireless technology advances, mobile devices currently can be connected by wireless technology, they can form a network architecture which is called mobile ad hoc networks. The mobile ad hoc networks allow mobile devices to form a network structure. Mobile devices through the network structure can get some digital information from other devices.
In P2P file sharing mechanisms, it has been proposed to use Bluetooth technology to share files. However, the Bluetooth technology only uses polling time. Due to the reason, the response time of P2P sharing mechanisms increases. At the same time, we find UWB technology has characteristics with small size, low cost, low power consumption and high-speed transmission. Compare with Bluetooth technology, UWB has additional contention access period to share file. It can reduce response time and improve the success rate.
The purpose of this study is enhance performance of the P2P file sharing on MANET by using UWB; and use UWB characteristics to reduce response time and improve the success rate. There are two extra characteristics of UWB. First, In addition to the period of CTA, UWB can use contention access period to transmit packets. Second, this study considers the characteristics of DEVs in the same Piconet can transmit packets with each other. Based on the above characteristics, we propose two mechanisms. One mechanism can choose better time period to transmit packets, and the other mechanism can transmit packets with short path.
According to the simulation result, the above-mentioned mechanisms can improve the success rate and reduce response time.To confirm the use of UWB technology can effectively enhance their performance.
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