Kanada, Y., not yet published (April 2008).
[ 日本語のページ ]
[ 論文 PDF ファイル ]
Abstract: Real-time and multimedia applications require an end-to-end QoS guarantee, and various types of applications require various QoS conditions. A DiffServ network should guarantee different QoS conditions for different types of communications. In this paper, the effect of traffic control in a DiffServ core network is experimentally evaluated using bursty traffic generated by an MMPP (Markov-Modulated Poisson Process) model. The situation to be simulated is that there are hundreds of conversational video streams that are delay-sensitive and hundreds of streaming videos that are loss-sensitive. If there are bandwidth-sharing queues such as those follow WFQ (Weighted Fair Queuing) in the core no-des and the two types of video traffic are assigned to two of the queues, the requirements of both types of traffic can be satisfied in a better way (a more efficient way) by assigning a larger weight to the queue for the conversational video. In our experiment, the optimum ratio of the weights was ap-proximately 1.3 when the traffic rates were the same. The optimum weight shares depend on the nature of the traffic, especially the burstiness.