Some criterions of QoS routing for the Internet

We consider some routing criterions for connections with QoS requirements in the Internet, which support QoS guarantees for both the services and networks. First we investigate the path consumption, and give the definition of the path consumption function (PCF). Then we observe the path selection´s influence on the link residual bandwidth, we find that letting the narrowband connection choose those links with small residual bandwidth can increase the admission probability of the broadband ones. We define the bandwidth fragmentation function (BFF) for connections which reflects this influence. After that we give the definition of the network efficiency function (NEF) for the network performance measure. A QoS routing scheme and some simulation results are given. We conclude with a summary and with directions for future work.