Abstract
On wireless LAN, the available bandwidth which a node can use varies according to the number of nodes connected to the access point, data rate and so on. Therefore, when a node hands over from an idle wireless access point to a congested one, due to the delay of the adaptation of data sending rate, packets of realtime data may suffer excessive transmission delay. To prevent this problem, we have proposed a scheme that a control server notifies a handover node of a suitable new sending rate according to estimated available bandwidth at the new AP. ITo seek an effective way for estimating available bandwidth just after a handover, we measured a correlation between the interval of arrival time of probe packets which are sent periodically on a wireless LAN and the sending rate of data flows of DCCP CCID3 on a real wireless LAN. Based on the measurement results, we discuss strategies to estimate a sending rate using the interval of arrival time of probe packets.
