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Insufficient ground stations promote the emergence of inter-satellite links (ISLs). Nowadays, adopting free space optical (FSO) ISLs has been a new trend for data communications. However, FSO ISLs across the atmosphere may perform worse in adverse weather such as fog or snow. In addition, using ordinary flat routing causes an excessive processing overhead, and diverse quality of experiences (QoEs)...
In vehicular ad hoc networks (VANETs), due to highly mobile and frequently changing topology, available resources and transmission opportunities are restricted. Transmitting frames efficiently within transmission opportunities is very important for system performance. Generally, there are many transmissions between many senders and receivers in a congested environment, which leads to network congestion...
Railway traffic is often perturbed by unexpected events. To effectively cope with these events, the real-time railway traffic management problem (rtRTMP) seeks for train routing and scheduling methods which minimize delay propagation. The size of rtRTMP instances is strongly affected by the number of routing alternatives available to each train. Performing an initial selection on which routings to...
Vehicular Delay Tolerant Networks (VDTNs) routing protocols is a hot research topic in the global context of Intelligent Transport Systems (ITS). To cope with the intermittent connectivity of vehicular communications, numerous protocols based on Store Carry and Forward (SCF) paradigm were designed, ranging from an adaptation of generic Delay Tolerant Networks (DTNs) to those specifically dedicated...
In vehicular ad hoc networks (VANETs), due to highly mobile and frequently changing topology, available resources and transmission opportunities are restricted. Transmitting frames efficiently within transmission opportunities is very important for system performance. Generally, there are many transmissions between many senders and receivers in a congested environment, which leads to network congestion...
Studies about autonomous taxis (aTaxis) concluded that empty vehicle movements account for a share of about 10% of vehicle miles traveled. In many of these studies, constant (in time or space) travel times are used due to a lack of data and to simplify the computations. Furthermore, the influence of the empty vehicle movements on the street network has not yet been a focal point of research. To address...
Cloud data centers are critical infrastructures to deliver cloud services. Although security and performance of cloud data centers have been well studied in the past, their networking aspects are overlooked. Current network infrastructures in cloud data centers limit the ability of cloud provider to offer guaranteed cloud network resources to users. In order to ensure security and performance requirements...
Software-defined networking (SDN) is a promising future network architecture which introduces new dimensionsin flexibility and adaptability to cope with different Quality of service (QoS) metrics, such as latency constraint, loss rate, etc. In this paper, we provide differentiated Services for flows of a topic-oriented publish/subscribe system to address some of the QoS guarantee issues, by leveraging...
In this paper, the basic methods of routing organization in software-configurable network are considered. The efficiency of the implementation of routing SDN networks are evaluated using a specially designed setting — delays in the routing domain. Evaluates the effectiveness of routing under various principles of organization SDN-Controller and the various protocols for implementing an interface between...
DTN (Delay/Disruption Tolerant Networking) inserts a new layer between the application layer (L7) and the transport layer (L4) for reliable communication on long-delay, intermittent, or lossy inks. Such a new layer, however, should provide not only a single rich service but also various rich services. We are proposing Layer-5 (L5) inserted between L7 and L4 to provide multiple rich services. One of...
To speed up the recovery from network failures, an extensive list of methods have been proposed. Many failure-recovery methods are proposed based on tunneling or marking, which increase the packet processing burden on routers and consume extra bandwidth. With neither tunneling nor marking, existing methods guarantee recovery from any single-link failure if a detour for the failed link exists, but...
In state-of-the-art Delay Tolerant Network (DTN) routing algorithms, two encountering nodes rely on routing utilities (e.g., probabilities of meeting other nodes) to decide the better carrier (defined forwarder) for their packets. As the utilities and forwarder information reflect user privacy, nodes may be reluctant to disclose such information, which however is indispensable in routing. To handle...
In this paper, we seek to address anonymous communications in delay tolerant networks (DTNs). While many different approaches for the internet and ad hoc networks, to the best of our knowledge, only variants of onion-based routing have been tailored for DTNs. Since each type of anonymous routing protocol has its advantages and drawbacks, there is no single anonymous routing protocol for DTNs that...
This paper proposes a position-based routing scheme called Speed Up-Greedy Perimeter Stateless Routing Protocol for Wireless Sensor Networks (SU-GPSR). The speed up mode works together with greedy mode to provide a solution for data transmission in WSN. Unlike other variants of greedy perimeter stateless routing protocols, SU-GPSR not only embraces both still nodes and mobile nodes in one unified...
Over the past decade, online social networks (OSNs) such as Twitter and Facebook have thrived and experienced rapid growth to over 1 billion users. A major evolution would be to leverage the characteristics of OSNs to evaluate the effectiveness of the many routing schemes developed by the research community in real-world scenarios. In this demonstration, we showcase the Secure Opportunistic Schemes...
A key issue in delay tolerant networks (DTN) is to find the right node to store and relay messages. We consider messages annotated with the unique keywords describing themessage subject, and nodes also adds keywords to describe their mission interests, priority and their transient social relationship (TSR). To offset resource costs, an incentive mechanism is developed over transient social relationships...
In cognitive radio networks (CRNs), the established communication sessions between secondary users (SUs) may be affected or even get interrupted because the SUs need to relinquish the spectrum when the licensed users (PUs) appear and reclaim the spectrum/channel. On detecting PU activities, the SUs on the affected links either switch to another available idle spectrum using the same link or the SUs...
Network tomography is a vital tool to estimate link qualities from end-to-end network measurements. An implicit assumption in network tomography is that observed measurements indeed reflect the aggregate of link performance (i.e., seeing is believing). However, it is not guaranteed today that there exists no anomaly (e.g., malicious autonomous systems and insider threats) in large-scale networks....
Micro-clouds infrastructures allow supporting applications on local and energy-efficient resources. Communication between micro-clouds takes place on shared and non-dedicated Internet links. Network control and optimization can only happen at the edge. For availability and persistence, the storage of application data must be geo-replicated. Maintaining strong data consistency under concurrent accesses...
The explosion of traffic demands within data centers accentuates the conventional infrastructures ossification. Unfortunately, the traditional tree based architectures struggle to resist and suffer from congestion and wiring complexity which deeply deteriorate the network performance. In aim to address the QoS degradation, we put forward a Hybrid Data Center Network (HDCN) architecture based on CISCO's...
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