Dynamic Bandwidth Allocation for Ethernet PON with FTTH traffic pattern

• Main Authors: Lai bo-zhi, 賴柏志
• Other Authors: 黃培壝
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/49105648829572205418

碩士 === 大葉大學 === 資訊工程學系碩士班 === 94 === Recently, there has been a dramatic evolution of the network technology. A technology that has been considered to improve the performance of local loop is the Ethernet passive optical network (EPON). EPON is considered an attractive solution because it provides the high bandwidth associated with optic fiber. It also has no active components between the customer premises and the exchange that significantly reduces the cost. In the downstream direction, an EPON is a point-to-multipoint network in which the OLT broadcasts data to each ONU. In the upstream direction, an EPON is a multipoint-to-point network in which multiple ONUs transmit data to the OLT, these ONUs share the common upstream channel. Hence, it uses multiple access method to avoid collision. Polling based algorithm is a common used multiple access method. However, a drawback of the polling based algorithm is that it causes unnecessary signaling traffic while an ONU is idle. This paper proposes a novel dynamic scheduling algorithm, which is termed CW+LBA (Contention Window and Limited Bandwidth Allocation), to solved that problem. The FTTH (Fiber to the Home) traffic simulated result shows that throughput and mean queuing delay is significantly outperform others.