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The growth of Internet traffic has led to an increase in energy consumption by network equipment such as routers and switches. Consequently, energy consumption is becoming a key environmental, social, political and cost issue. Focusing on energy consumption by Internet Service Provider networks, the energy bottleneck is routers. Thus, it is imperative for us to reduce the energy consumption of routers...
A managed wireless mesh for infrastructure-level, stable regional mesh network has been studied. NerveNet, which we have been proposing, is a concept of future regional platform network that covers local regions and provides various context-aware services with the shared use of sensors and actuators. The managed wireless mesh developed for materializing NerveNet features auto-configuration of multiple,...
Wireless technology offers flexibility and mobility that enables users to access to any service including voice call, anytime, anywhere with any device. Transferring call or session across devices is also made possible with today's session management protocol such as SIP, provided the user knows the contact information of the target device. In this paper, we propose a method which simplifies the transfer...
A fundamental challenge in data center networking is how to efficiently interconnect a huge amount of servers. The network architecture typically consists of a tree of routing and switching elements with progressively more specialized and expensive equipment moving up the network hierarchy. Unfortunately, even when deploying the highest-end IP switches/routers, resulting topologies remain complicate...
Aiming at the security requirement of the Intranet that is different from Internet, an security architecture for Intranet is proposed. In physical layer and data link layer, based on network switch the intranet is divided into several parts separated from each other as required. In network layer, making use of the NAT gateway integrated in virtual server the intranet or its part is hidden to ensure...
This article offers the original method and algorithms of packages routing from one source to many addressees by files transfer of greater sizes. The method is named systolic routing which provides extremely high speed for transfer of data packages in switching packages networks.
The current Internet provides a best-effort service, which can not satisfy service quality guarantees that VoIP systems often require. Systems such as multi-homing and overlay network leverage path diversity that Internet inherently has to enhance end-to-end application performance. In this paper, we propose a P2P overlay approach, which is used to transmit media stream in SIP+P2P system. SIP+P2P...
MeshTest is a laboratory-based multi-hop wireless testbed that can subject real wireless nodes to reproducible mobile scenarios. It uses shielded enclosures and an RF matrix switch to dynamically control the attenuation experienced between pairs of nodes. The testbed is an ideal platform for experimenting with MANET and DTN implementations, offering convenient experimental control and data management.
It is common that Internet service hosting centres use several logical pools to assign server resources to different applications, and that they try to achieve the highest total revenue by making efficient use of these resources. In this paper, multi-tiered enterprise systems are modelled as multi-class closed queueing networks, with each network station corresponding to each application tier. In...
The high end of high performance computing (HPC) systems is now moving toward petascale deployments, delivering petaflops of computational capacity and petabytes of storage capacity. Interconnection of the sheer number of server nodes in an HPC system plays a vital role in the developments. InfiniBand has emerged as a compelling interconnect technology, and provides more scalability and significantly...
In distributed real-time systems, most of the end-to-end delay fluctuations, especially the delay fluctuations in the network, are bounded provided that the global network traffic loads are manually controlled to be light-weighted. This paper introduces a simple clock synchronization method in distributed real-time systems by using the traffic smoothing technique which is implemented at each end node...
We propose the efficient contents delivery method with scheduled unicast and multicast to reduce the load of contents server and network congestion. In our proposed method, the timing of transmitting contents is arranged when many users access the contents in short period of time. Furthermore, the method of transmitting contents is switched from unicast to multicast. We evaluate the performance by...
We present a new system model based on DLNA 2- box models. The proposed system supports pull-type and push- type streaming of AV content on the same device platform, which is not directly supported by DLNA currently. This system also provides a streaming-conflict avoiding mechanism and a dynamic pull-push switching mechanism.
Queueing systems with cyclic service have a broad range of applications in communication systems, e.g., in switching systems, ring networks, burst assembly in OBS and traffic aggregation in edge nodes. While such systems have been extensively studied, the buffer capacity is often assumed to be unlimited. In real systems, queue sizes are always limited. We present an analytical method using state-space...
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