in this paper, new features of satellite configuration, such as ip network  based infrastructure and separated signaling and media  are considered to propose a variety of satellite configurations in different orbits. because of their  different altitude in space such as low earth orbit(leo) and geostationary orbit (geo). a test bed used to test call setup delay in a one space link to process th...

We consider a queuing network with M exponential service stations and with N customers. We study the behavior of a subsystem u, which has a single node as input and a single node as output, when the subsystem parameters are varied. An “equivalent” network is constructed in which all queues except those in subsystem u are replaced by a single composite queue. We show that for certain classes of ...

With their widespread deployment, the need to provide QoS in virtual networks is being realized. We show that traditional scheduling algorithms like WFQ are incapable of providing bounded delay service in a virtual network. The problem arises because traffic of a number of sessions sharing a virtual link in a virtual network is aggregated and tunneled through the physical network, which cannot ...

I have developed a lightweight Deficit Round Robin scheduler for the input arbiter of the NetFPGA router. The design is effective in reducing latency for small packets from one port in the presence of saturating traffic of large packets from another port. The design hides arbitration latency when multiple channels are active and achieves nearly optimal latency for the NetFPGA architecture. The ...

This article presents a systemic method to generate and map an optimal virtual topology onto a certain physical wide area optical fiber network so as to maximize the scaleup which provides an estimate of the network throughput. The problem is to find the best possible virtual topology over a given wavelength-routed all-optical physical topology for wide area coverage. The physical topology cons...

The InfiniBand Architecture (IBA) is a relatively new industry-standard networking technology suited for inter-processor and I/O communication. One of the challenges facing IBA networks is how to deal with congestion. The most recent version of the IBA specification includes a Congestion Control Annex (CCA) that relies on end-to-end Explicit Congestion Notification (ECN) packet marking to resol...

High-performance input-queued switches require highspeed scheduling algorithms while maintaining good performance. Various round-robin scheduling algorithms for Virtual Output Queuing (VOQ) crossbar-based packet switch architectures have been proposed. It has been demonstrated that they can operate at high speed (e.g., OC192), and are relatively simple to implement in hardware. In particular, a...