| Summary: | 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.
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