The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a practical methodology for designing, implementing and deploying IPv6 networks. We use a virtual lab to simulate topologies for different scenarios. These topologies are designed programmatically and then, tested for connectivity and efficiency. In particular, these scenarios include translation mechanisms such as DNS64 and NAT64, tunneling mechanisms such as 6to4 and 6RD and...
The goal of this paper is two-fold. First, to expand an opportunistic network coding protocol for wireless networks, called PlayNCool, in order to incorporate new mechanisms to improve performance in the presence of packet losses. In particular, exploiting additional helper nodes to improve the quality of each link and even across neighbouring links and using simulations to show that an additional...
Due to its own features including variability of network topology, instable vehicle density and so on, Vehicular Ad hoc Networks (VANETs) can hardly guarantee efficient and reliable network connectivity which plays an important role in data dissemination. Compared with VANET, cellular networks is of great advantage to provide timely data propagation. To solve the problem of disconnection in VANET,...
High speed trains are becoming a popular means of transportation all over the world, such that it is necessary to develop and deploy an infrastructure to provide broadband to passengers on the train. However, there are several challenges to high speed communication systems including the fact that channel conditions change drastically hindering channel estimation accuracy and overall system performance,...
Neighbor discovery is a crucial building block required by important protocols in wireless ad hoc and sensor networks. Routing protocols usually rely on exchanging messages between neighboring nodes and many localization protocols determine nodes' locations based on their neighborhood relationships to other nodes or anchors. In hostile environments an adversary may launch subtle attacks against neighbor...
It has been recognized that effective communications and the ability to share various media are keys to a successful operation in public safety and military applications. LTE (Long Term Evolution) is becoming the most widely deployed broadband communication technology making it the technology of choice for public safety to replace TETRA and similar networks. However, LTE is a cellular network by design...
Distance is a key measure when implementing timer-based dissemination protocols in Vehicular Ad-hoc Networks (VANets). In which the transmission is deferred proportional to distance, aiming to order vehicles transmission, such that the farthest vehicle gets the highest opportunity to relay the message. This will ensure long hops along the road to speed up the dissemination and cover more nodes. However,...
Most of the existing broadcasting schemes either rely on GPS location or topology information or angle-of-arrival (AoA) calculation or combination of some or all to achieve high reachability. However, these schemes cannot be directly used in battlefield environment due to lack of node location and topology information both of which caused by electronic warfare and random burst mode of communication...
Improving availability and throughput is a significant challenge for data center networks. Recent studies have attempted to use a variety of routing and multipathing techniques. However, no method has yet managed to combine availability and throughput improvement with actual deployability, usually because of dedicated hardware requirements. In this study, we focus on commodity-based layer-3 data center...
The communications infrastructure of the electric grid has been evolving rapidly in the last decades due to the need for transporting ever more sophisticated information, both data and control. More recently Ethernet based networks have been added into the picture, as modern relays need to communicate with control and dispatch centers and centralized management systems over local and wide area networks...
We introduce a mathematical framework to the analysis, design and optimization of Network-Coded Cooperative Diversity (NCCD) protocols. The analysis is applicable to relay-aided protocols based on the error propagation model, which rely on appropriately designed diversity combining demodulators at the destination. Wireless networks with an arbitrary number of sources and relays are considered. Arbitrary...
There are more and more pervasive applications of Wireless Multicast Network, such as the video conference, the voice transmission and the software updates etc. The traditional wireless multicast routing method is to construct a multicast tree, which may ignore many available links. This paper presents Markov Decision Process Based Multicast Opportunistic Routing Model. Whether each node of the whole...
Quantum communication is a new interdiscipline developed in recent twenty years, it is a new area of research that combines both quantum theory and information theory. Compared with the traditional means of communication, quantum communication has the absolute security features. The paper gives the design scheme of quantum communication network instant Messaging system based on SIP protocol, including...
Localization in Wireless Sensor Networks (WSNs) is a major task, since network composed of a large quantity of energy-limited nodes. Most of the WSN constrains are required a localized mechanism. To achieve a greater quality of service a new localized mechanism is proposed in this work, based on neighbor connectivity information. The simulation results show that the proposed work significantly out...
Localization in Wireless Sensor Networks (WSNs) is a major task, since network composed of a large quantity of energy-limited nodes. Most of the WSN constrains are required a localized mechanism. To achieve a greater quality of service a new localized mechanism is proposed in this work, based on neighbor connectivity information. The simulation results show that the proposed work significantly out...
We consider a type of game theoretic dynamics in a network model where all nodes act selfishly and will forward packets only if it is to their benefit. The model we present assumes that each node receives utility from successfully sending its own flow to its destination(s) and from receiving flow, while it pays a cost (e.g., battery energy) for its transmissions. Each node has to decide whether to...
In this paper, we proposed an efficient FSN (first station number) assignment scheme to mitigate urgent message transmission delay in multi-hop MIL-STD-188-220D w/Change 1 networks. In the standard, the FSN is incremented constantly and designates the index of a station that is to have the first network access opportunity at the next network access period. When a station transmits its message to stations...
In this paper we compare the energy efficiency of different cooperative schemes by means of energy efficiency contours. We consider a three-nodes cooperative scenario, employing either the amplify-and-forward (AF) or the decode-and-forward (DF) protocol. In the case of the DF protocol we analyse the performance of both repetition coding (RC) and parallel coding (PC). Our analysis shows that the maximum...
MIL-STD-188-220, a typical Ad-Hoc protocol frequently used by the military, utilizes an FM radio to perform Relays. The function of the SDR (Source Directed Relay), which refers to the routing information table interchanged to the function of the Topology Update, sets up a path to reach a receiver. Due to the low speed interface of the FM radio, we designed a simulation employing OPNET to determine...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.