Masanori Hanawa

Traffic measurement-based admission control using rate envelope in ATM networks

This paper reports a traffic measurement-based bandwidth allocation mechanism using the minimum envelope rate (MER) technique in ATM networks. The rate envelope technique simplifies the bandwidth allocation for higher bursty sources and can improve substantially the utilization of network resources. In the proposed approach, we measure the MER and the average arrival rate using traffic observations with a slide time window, and then a virtual source of which the peak rate and average rate are equal to the measured MER and the measured average rate is composed. From the virtual source, we can get all of required parameters for bandwidth allocation and admission control. The proposed admission control approach based on the minimum envelope rate technique is confirmed by various computer simulations. We demonstrate that the minimum envelope rate technique can be applied to the real time admission control. Consequently, it becomes clear that the proposed scheme shows high efficiency for higher bursty sources.

WDM transmission system using dispersion slope management

In wavelength division multiplexing (WDM) transmission systems, it is a problem that the transmission characteristics are degraded due to the fiber nonlinear effects. These nonlinear effects are caused by the pulse collision due to the group velocity difference between different channels. In this paper, a novel WDM transmission system with the dispersion slope management is proposed. The system manages not only dispersion but also dispersion slope and group velocity differences to suppress the third order dispersion and nonlinear effects. Our numerical results shows that the proposed system can suppress both of them and has good characteristics in long haul transmission.