QoS-Promoted Dynamic Bandwidth Allocation (Q-DBA) for Ethernet Passive Optical Networks

• Main Author: 黃琴雅
• Other Authors: 張仲儒
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/88746151090042303702

碩士 === 國立交通大學 === 電信工程系所 === 94 === To support the increasing traffic load and the growing demands of broadband multiple services in the network, Ethernet passive optical networks (EPONs) are the candidate of the next-generation access networks. The convergence of low-cost Ethernet equipment, lowcost fiber infrastructure, and the large bandwidth of the optical fiber link make the EPONs suitable for providing broadband services. Presently, in the multimedia environment, qualityof- service (QoS) becomes an important issue. In this thesis, we propose a QoS-promoted dynamic bandwidth allocation (Q-DBA) method to support transmitting delay-constrained voice and video packets, and starvationconsidered data packets. The goal of the Q-DBA method is to meet the delay criterion of voice service under the voice dropping probability is set to zero, the delay criterion and dropping probability of video probability, and to simultaneously maintain the delay of data packets. The data packets should not endure a long delay time although they do not have strict delay criterion. When the QoS requirement of real-time service can be satisfied, the performance of non-real-time service should be improved. Simulation results show that the proposed method can almost meet our goal. If combining call admission control (CAC), our goal can be totally achieved.