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Cognitive radio is an emerging technology that has been under heavy research in the recent years, as it is considered to be a promising solution for the spectrum scarcity problem. In the European Defense Agency's project Cognitive Radio for Dynamic Spectrum Management (CORASMA) a high precision cognitive radio simulation environment was developed based on an artificial UHF waveform. Target of that...
Now, SDN (Software Defined Networking) has been accepted as an unavoidable networking architecture since the ONF (Open Networking Forum) foundation, the release of Google's B4 project, and several respective deployments of cloud and transport SDNs. In addition, SDN has been investigated for a basic networking infrastructure for the 5G/IoT's era and an integration between SDN based cloud and transport...
Voice over Internet protocol (VoIP) transmits voice communication in the packet-based switching network that requires packets to be delivered in a steady timing and with low latency, jitter, packet loss and sufficient bandwidth. Ethernet passive optical network (EPON) is one of the best future-oriented next-generation access network technologies, which can use the strict dynamic bandwidth allocation...
In scenarios where a number of client nodes share a gateway in order to access a high-delay link, the original TCP as well as TCP variants specifically designed to improve performance on those links fail to provide optimal performance; this is due to the indirect inference of both end-to-end congestion and local channel conditions. To mitigate the former, C²ML (Congestion Control Middleware Layer)...
Service discovery in vehicular networks has been extensively investigated in literature. Collecting and disseminating data in high mobility networks in a reliable and efficient way without exhausting network bandwidth is still challenging, due to unreliable channel access in broadcast scenarios and thus results in loss of time through resending packets. Sending delta information to reduce network...
Society of 3rd Generation Partnership Project (3GPP) is presently evolving Long Term Evolution Advanced (LTE-Advanced) as a development of the standard of LTE. This generation aims to produce specifications for a new radio-access technology geared to higher data rates, low latency and greater spectral efficiency. LTE-Advanced is an evolutionary step in the continuing development of LTE where the description...
This article presents an approach towards aggregating bandwidths of multiple physical layers i.e. transmitting and receiving data simultaneously through the multiple physical interfaces of a fixed computing system. The data over physical layers can communicate over both wired and wireless communication medium at the same time. This proposed bandwidth-aggregation-system (BWA) enhances the download...
IP multicast has proved to be the best approach for large scale multimedia communications enhancing video transmissions for applications like IPTV, video conferencing or other best-effort real-time audio/video applications. IP multicast connectivity, unfortunately, relays on certain network technologies and protocols and is present only in some areas of the Internet, while the majority of hosts lack...
Recently, Variable-structure Congestion-control Protocol (VCP) has emerged as a great practical alternative of deployment for congestion control by requiring the use of only two ECN bits in the IP header. However, VCP suffers from a relatively low speed of convergence and exhibits biased fairness in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback...
A new type of gateway, called a ConnectionLess Circuit (CLC) gateway is proposed to internetwork connectionless (CL) networks with dynamically shared circuit/virtual networks. In contrast with IP routers, CLC gateways implement (a) a signaling function to receive circuit setup/release requests triggered by end hosts and initiate dynamic circuit setup/release through their attached circuit subnetworks,...
The DVB-RCS standard provides a framework for Multi-Frequency TDMA (MF-TDMA) and dynamic resource (frequencies and time slots) allocation over satellite links. Nevertheless, MF-TDMA and dynamic resource allocation alone are not sufficient to achieve satisfactory throughput for TCP, the dominant transport protocol in IP-based networks such as the Global Information Grid (GIG) system, due to the inherent...
The Internet has been growing rapidly since the last decade. Measuring the Internet growth is a subject of interest in many countries. The International Telecommunication Union (ITU) has defined a number of Internet indicators for measurement. However, due to the Internet's organization and structure, there are very limited measures available on the Internet growth. Data and statistics are not easily...
One of the vital key elements for providing quality of service (QoS) for VoIP is the call admission control (CAC) capabilities of the session management/call session control function or gateway. Even though the network may be designed to meet a given performance and restoration objective for the engineered traffic loads, the actual traffic may be significantly higher. Without a CAC function in a VoIP...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
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