Hiroki Furuya

Multi-layer Network Management System integrated with a Network Planning Tool for IP/Optical integrated network

A multi-layer NMS was successfully developed to manage the optical network and the MPLS network. The integrated network-planning tool could appropriately provide the optimized routes for a new LSP and all the existing LSPs.

QRP05-6: Combined Adaptive Congestion Control Method for Communication-Broadcasting Integrated Services

This paper proposes a combined adaptive congestion control method for massive and intensive telecommunication traffic expected in communication-broadcasting integrated services. The proposed method adaptively controls data transmissions from viewers by combining transmission restriction and delayed transmission depending on the congestion states, so that the severe congestion can be avoided effectively. Furthermore, it utilizes the broadcasting channel which is not only reliable, but also scalable for controlling the responses from vast numbers of viewers. The performance of the proposed method is evaluated through experiments on a test bed where approximately one million viewers are emulated. The obtained results quantitatively demonstrate the performance of the adaptive control method and its effectiveness under massive and intensive traffic conditions.

An Optimal Route Computation Method for GMPLS Based Survivable Network with a Tabu Search Algorithm for the Weighted Constraint Satisfaction Problem

This paper proposes a route computation method for a GMPLS based survivable network. It is classified as a precomputed and centralized approach. It tries to globally optimize both working and recovery routes for each demand while taking account of GMPLS recovery schemes and network resource constraints. To enhance its scalability as well as computational performance, two unique devices are introduced to the method: utilization of a tabu-search algorithm for the weighted constraint satisfaction problem (WCSP) and the limitation of candidate routes. Experimental results demonstrate the possibility that it could handle practical-scale networks with satisfactory performance in both optimality of solution and computational time