The development of Internet Things devices as well the increase nodes in wireless networks, motivates use node?s cooperation for system performance improvement. On other hand, power requirements increasing number leads to need new powering sources. In this paper we consider device-to-device relay-assisted system, where decode-and-forward relay is not equipped with its own supply, but it harvest...

Combinatorial optimization problems are abundant in the telecommunications industry. In this paper, we present four real-world telecommunications applications where combinatorial optimization plays a major role. The first problem concerns the optimal location of modem pools for an internet service provider. The second problem deals with the optimal routing of permanent virtual circuits for a fr...

Layer Two Tunneling Protocol (L2TP) describes a mechanism to tunnel Point-to-Point (PPP) sessions. The protocol has been designed to be independent of the media it runs over. The base specification describes how it should be implemented to run over the User Datagram Protocol (UDP) and the Internet Protocol (IP). This document describes how L2TP is implemented over Frame Relay Permanent Virtual ...

In this paper, an adaptive relay scheme based on post SNR in cooperative communication system is proposed. conventional cooperative scheme has used the same modulation at a relay. The proposed scheme uses hierarchical modulation at the source and adaptive transmission based on the post signal to noise ratio (SNR) at a relay. Accordingly, the symbol error rate (SER) and throughput performances a...

Overview This design project addresses the inherent ambiguities of text chat interfaces concerning which messages relate to which. Due to their linear nature, the relationship between two messages is not always obvious. A prototype of an application has been developed that allows users to structure their conversations in a mindmap or tree layout. Its use of space and color is designed to make i...

There is a growing interest in the development of broadband services and networks for commercial use in both local area and wide area networks. In particular, connectionless Switched Multilmegabit Data Service (SMDS) and connection-oriented Frame Relay based broadband services are beginning to be o ered by a number of major operators in the US and Europe. This paper considers the issues that ne...

So far, Earth-based space science has been carried out from a few dedicated facilities, with scientists working away from their home institution and with limited participation of the science community to the experiments. A better approach to ground control of space experiments would consist of deploying a network of operation stations located at various institutions and connected via Internet t...

This paper concerns power allocation in relay-assisted wireless channels for two-hop transmission. First, the transmitter sends the information to both the relay and receiver parts. Next, in the second hop, the transmitter cooperates with the relay to increase the received signal to noise ratio (SNR), assuming the relay makes use of the Amplify and Forward (AF) strategy. Moreover, it is assumed...

FTP is one of the most important applications on the Internet. This paper introduces a new paradigm for distributed FTP system called FTPGrid, which consists of a collection of FTP servers that work cooperatively and serve all FTP clients. FTPGrid adopts client/grid architecture. FTP clients connect to one server and access all resources in the grid. Some key issues such as resource directory a...