Available bandwidth (avail-bw for short) is a crucial metric in capacity provisioning, routing and QoS verification. However, existing tools failed to estimate it accurately and could not measure bandwidth beyond the source node's maximum sending rate. In this paper, we redefine the avail-bw based on link idle ratio. Then we analyze the effect of the routing of cross traffic packets on avail-bw measurement and present a novel approach, Idlerate, to measure end-to-end avail-bw for one path. Idlerate is fundamentally different in the basic idea from previous methods and sends small single packet randomly instead of sending packet pair/train back-to-back. Unlike methodologies based on packet dispersion, which are limited by the maximum sending rate of the sender, Idlerate could work on network whose capacity is far beyond the maximum sending rate of the sender. We have evaluated its accuracy and efficiency in simulations and compared its performance with current bandwidth estimation tools.
|Number of pages||5|
|Journal||Chinese Journal of Electronics|
|Publication status||Published - Jan 2006|
- Available bandwidth
- Bottleneck bandwidth
- Network measurements