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Ego-network concept has been systematically studied, since this kind of network employs only locally available information to analyze its structure. Degree, closeness, and betweenness are widely studied centrality measures. Among the three measures presented, betweenness centrality in ego-networks is the most used in several fields such as Wireless Mesh Networks, Wireless Sensor Networks, and Delay...
Future tactical communications involves high data rate best effort traffic working alongside real-time traffic for time-critical applications with hard deadlines. Unavailable bandwidth and/or untimely responses may lead to undesired or even catastrophic outcomes. Ethernet-based communication systems are one of the major tactical network standards due to the higher bandwidth, better utilization, and...
Reliable service provisioning is crucial to the public safety (PS) communications especially when network outage happens. Isolated E-UTRAN operation, introduced in LTE Release 13, is able to host separate core network functions at the base stations (BSs) to provide limited set of services to the users. However, a significant issue remains to be solved is to coordinate among BSs to create an autonomous...
In telecommunication networks resilience intuitively refers to cycles and their lengths. More specifically, considering that the shortest cycle involving each pair of nodes in the network can be disassembled into two disjoint paths, a working path and a backup path, the average of the shortest cycles involving each pair of nodes in the network can be considered as an indicative of resilience. In turn,...
For reenterable models of IP networks with dynamic routing according to RIP protocol, measuring subnets for QoS parameters evaluation have been essentially modified and extended. Online algorithms of statistical analysis have been specified by colored Petri nets. The mean and variance of the packet delivery time have been evaluated. As a result, the computation precision has grown and an essential...
This paper concerns quality of service in optical burst switching realized by dynamic wavelength grouping. It reports detailed simulations of this method in presence of combined edge-core nodes using special scheduling algorithm. Specifically, we are interested in optimal partitionings of wavelengths among traffic classes of high and low priority. We observe certain tradeoffs between minimizing the...
In this work we describe the process of deploying virtual routers in accordance with flexible time allocation of virtual access to the processor. We developed the model of software router with a set of modern mechanisms and algorithms service information flows. Using the model of the router we enhanced functionality of the device: added mode of deployment of virtual nodes with the possibility of flexible...
The problem of efficient resource management in large cloud data centres is well recognised in the cloud management community. With the rising demand for cloud services and expansion of the size and distribution of data centres, the repercussions of not taking into account all parameters of interest while allocating resources are becoming significant. Hence, one of the major issues today is how to...
To deal with the severe challenge from explosively increasing mobile users' multimedia service requests in mobile networks, introducing cloud-based computing platform and content caching into radio access networks (RANs) has become an effective emerging technique. In this paper, we propose a collaborative hierarchical caching framework in cloud RANs (C-RANs), which minimizes the access delay of content...
We propose algorithms that uses fast graph mining for resolving the network topology to a locally regulated area defined as a component of network topology. Though the IP backbone network should be reconfigured periodically in accordance with environmental changes, reconfiguration results in heavy workload, such as routing re-designs or testing these re-designs for network operators. If a network...
Software Defined Networking (SDN) technologies provide applications opportunities to manipulate underlying network flows and topologies via network controllers during runtime. In cloud environments, networked virtual machines can be enhanced by SDN by providing applications with controllable infrastructures to meet system-level quality requirements; however, customizing a suitable network topology...
Software Defined Networking and Network Function Virtualisation provide significantly more flexibility and control when provisioning QoS for delay sensitive services. Network delay can have a detrimental impact on VoIP quality and, therefore, minimising delay can help maintain the quality and prevent call dropping. This paper proposes a queuing scheme based on packet delay for prioritising VoIP calls...
Software Defined networks (SDNs) paradigm tries to improve the network performance, facilitating the network management and the scalability basing on open-source software and adding a new entity called controller that manages the entire network. One of the goals of the controller is taking decisions in regards to routing instead of distributing it among the network nodes, as usual. However, this field...
Most Information Technology (IT) services nowadays rely on one or multiple data centers. In this paper, we propose a Quality of Service (QoS) scheme for Intra/Inter data center communications systems. The proposed scheme is based on differentiation of traffic into different class categories. The differentiation is based on the source of traffic as well as the specific traffic's requirements. We conduct...
To mitigate performance anomalies due to different transmission rates and improve throughput performance in ad-hoc networks, we propose a method called user cooperative mobility in which a node, i.e., a user of an ad-hoc network, moves (changes its geometrical position) for communication. Unlike previous research regarding user cooperative mobility, it is not easy to decide to where the user should...
Using the cloud for software defined networks opens new possibilities for the organization of computing processes of network controllers. The article considers the possibility of using an “endless train” method for virtualization of individual functional opportunities of SDN OpenDayLight controller. This method allows organizing controller computer processes caused by the need to serve the dynamically...
In this paper, we propose a deadline-aware routing algorithm that considers a probabilistic delay constraint with a pre-specified deadline for cyber-physical systems (CPS). Most routing algorithms minimize a certain average performance metric such as mean delay. Whereas, our proposed routing algorithm can route traffic to maximize the probability reached within a given deadline by considering the...
IP - VPN and VPN Service Provider (VSP) customersmaintain the quality for the routing and signaling entities. In thenetwork, VSP is getting viewing by VPN like opaque entity andlimiting meaningful interaction between the VPN and VSP. In thispaper, we will reduce the (Crankback + Miscall) Ratio for theVPN network and increase the VPN Successive Rato. As from theresults session, VPN (Crankback + Miscall)...
A Smart Grid system involves many applications, such as power grid state monitoring and control, demand response, distribution automation, distributed generation and microgrids. They will generate a large volume of data traffic over the grid with different quality of service (QoS) requirements, which present challenges to the existing network architecture and protocols. In this paper, we propose to...
Modern telecommunication networks are very complex and they should be able to deal with rapid and unpredictable changes in traffic flows. Virtual Network Topology is used to carry IP traffic over Wavelength-division multiplexing optical network. To use network resources in the most optimal way, there is a need for an algorithm, which will dynamically re-share resources among all devices in the particular...
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