| Summary: | 碩士 === 大同大學 === 資訊工程學系(所) === 94 === The store-and-forward system using little low earth orbital satellites can provide non-real-time communication services such as data collection, paging, e-mail, etc. It is a solid alternative to various applications because of its low cost and simple deployment.
In this thesis, we consider the collision problem in the data link control sublayer of the store-and-forward system. The sublayer is called the medium access control (MAC) sublayer. The well-known access protocols such as Pure-ALOHA and Slotted-ALOHA have found their applications in this problem. However, these conventional protocols are not optimized to handle long propagation delay characterizing the satellite network. Hence, to improve time and throughput efficiency of the conventional protocols, a novel protocol is proposed in this thesis. The novel protocol is called the Multiple Access Control with Rush Period (MAC/RP) protocol.
In MAC/RP protocol, the communications are divided into two periods, the transmission and rush periods. Conceptually, contentions are resolved during the rush periods while uninterrupted transmissions are ensured in the transmission period.
Through simulations, we found that this protocol provides strong throughput performance with moderate cost increase. We believe it will be best used in remote scientific data collection such as oceanic salinity.
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