A New Energy-Efficient QoS-Aware Upstream Transmission Mechanism in EPON

• Main Authors: Chien-Jung Wang, 王建融
• Other Authors: I-Shyan Hwang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/44909605754540841331

碩士 === 元智大學 === 資訊工程學系 === 102 === The main energy consumption in the computer networks is the access networks. The passive optical network (PON) has the least energy consumption among access network technologies. In addition, the time division multiplexing (TDM) Ethernet PON (EPON) is a best candidate to improve the energy consumption by time utilization. The optical network unit (ONU) can utilize the time and save the energy in the EPON by turning off its transceiver/receiver when there is no upstream/downstream traffic. Many studies are proposed the schemes to turn off transceiver/receiver and achieve the maximum energy saving. However, these schemes increase the mean packet delay and consequently, reduce the Quality of service (QoS). In this paper, a new energy-saving mechanism in enhanced EPON with new components in the ONUs and OLT is proposed to guarantee the QoS metrics. The proposed mechanism considers the QoS first, and then saves the energy as possible. A green dynamic bandwidth allocation (GBA) and the modified GATE message are used to enable the doze time calculation and message passing between ONUs and OLT. Simulation results show the proposed energy-saving mechanism not only promises the QoS performance in terms of mean packet delay, packet loss, throughput and jitter but also saves the energy-saving ratio in different maximum cycle times.