A Link-Adapted Fragment and Rate Matching (FaRM) MAC Protocol for Mobile Ad Hoc Networks
| Autor: | Li-Jie Cheng, 鄭立傑 |
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| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 In the wireless environment, the channel condition varies due to several factors, especially in mobile ad hoc networks. Previous researches use SNR thresholds to determine the channel condition. However, SNR thresholds may not be an accurate decision, especially in a quickly varied environment. This paper proposes a fragment and rate matching (FaRM) MAC protocol for mobile ad hoc networks. In FaRM, stations dynamically detect the current signal-noise-ratio (SNR) to present the channel quality through the control frame exchange. Then FaRM uses Finite State Markov Chain to predict the variation of the channel quality. FaRM therefore can get closer results of the error occurrence in the channel than previous researches. According to the results generated from Finite State Markov Chain, FaRM dynamically selects the transmission rate with an acceptable fragment length. FaRM not only gains better throughput through the selection of high rate, but also increases the reliability by fragmentation. Comparing to other researches, the simulation results show FaRM has better performance, higher transmission reliability and lower transmission delay time by fragmentation according to the prediction of the network. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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