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Video distributions using TCP (called "TCP streaming") like YouTube have been increased rapidly with the improvement on the speed and capacity of the Internet. Thus, it is an important technical issue to guarantee QoS (quality of service) suitable for TCP streaming. However, it is difficult for the existing IP network to guarantee QoS of the TCP streaming. So far, in order to achieve the...
OPS (optical packet switching) networks are considered as one of promising candidates for new generation network architecture. However, optical RAM has not been realized yet. Hence, high packet loss probability is a serious issue on feasible OPS networks. Now, there are some ways to solve this issue. The first approach is the usage of congestion avoidance devices like wavelength converter, fiber delay...
We propose a programmable and scalable traffic management scheme. Programmable traffic management at high-speed routers is difficult because programmability and high-speed packet processing have involved a serious tradeoff. To attain both, the new scheme combines control programs at a control server and simple packet handling functions, such as sampling packet headers and discarding packets, at routers...
When multiple overlay networks are constructed over the same underlying IP network, overlay paths on different overlay networks may share some links on the IP network. In general, however, because overlay networks do not recognize the existence of each other, they have no consideration on such shared physical links. In this paper, a cooperative routing method for multiple overlay networks is proposed...
In OPS networks, the contention resolution is one of the main problems. To reduce these contention events, we aim the effective use of wavelength resources with a routing and wavelength assignment method. In addition to this, the collision avoidance devices, such as wavelength converters, can improve the network performance more flexibly. The proposed method focuses on not only how to assign route...
This paper presents a novel RWA cooperation method considering retransmission in distributed optical burst switched networks. In OBS networks, it is important to retransmit bursts if collisions occurred. Our proposal treats RWA problem for both of normal bursts and retransmitted bursts. The simulation results show that this method improves the burst loss probability.
We have proposed a packet contention resolution scheme that is based on the reflection routing, and furthermore enables to detour the reflected packet to alternate path by making better use of the link reflection latency. In this paper, we propose priority control using buffer threshold, evaluate the influence of optical buffer size and buffer threshold as parameters, and analyze what condition is...
Flooding algorithm is a fundamental control mechanism to notify all the nodes of some information, to get desired information from all the nodes, or to reserve a route, and so on. Flooding algorithm has merits of robustness and optimality to solutions. However, flooding algorithm has problems which increase the processing time until finishing the flooding control, and cause congestion in the network...
This paper presents the cooperation method, which cooperatively deals with RWA problem in distributed optical burst switched networks. The simulation results show that this method improves the burst loss probability
Various real-time applications are widely used with the development of network infrastructure. To guarantee QoS (quality of service) of these applications strictly, the Internet requires a flow-based priority control. Thus, we have proposed an output buffer control mechanism. In this paper, to guarantee end-to-end QoS maximally by exploiting the buffer control mechanism, we propose the method of mutual...
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