| Summary: | 碩士 === 大同大學 === 資訊工程研究所 === 94 === Ethernet passive optical network (EPON) is one of the potential solutions for the next generation access technology. Its economical equipment and maintenance costs are particularly attractive to telecommunication service providers. The EPON has a tree topology and the upstream bandwidth from optical network terminals to the optical line terminal is shared. To utilize the bandwidth in a fair and efficient manner, numerous dynamic bandwidth allocation schemes are proposed in the literature.
In this thesis, we will introduce and review these schemes, list their strength and weakness. One of our goals in this thesis is to give an overview to the current status of researches in this area. We will also introduce our work on a new scheme that considers performance on both bandwidth and delay.
In the EPON system, the existing algorithms of dynamic bandwidth allocation mainly focus on bandwidth allocation. The designers of these algorithms did not consider the delay resulted from the polling between ONUs. The delay will affect real-time video and audio applications. Thus, when we design a dynamic bandwidth allocation algorithm, the delay between the polling of ONUs is an important factor that we need to consider. We proposed a scheme that not only allocate the bandwidth fairly but also reduce the delay between the polling of ONUs. To our knowledge, this is the first attempt to consider both performance metrics in EPON. In conclusion, we summarize future works and point out the pending challenges for future study.
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