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In this paper, we study the problem of survivable virtual optical network (VON) mapping against single link failure with shared backup path protection (SBPP) in elastic optical networks. We formulate this problem with an integer linear programming (ILP) model to minimize the resource consumption of both working and backup paths. A different dynamic cost model (DDCM) for each sharable frequency slot...
Cognitive radio networks play a vital role in solving the problem of underutilization of spectrum by identifying unused licensed radio spectrum. They solve the problem by distributing this unused spectrum among unlicensed users in an intelligent fashion without interfering with existing users. In this paper, using the conflict graph and graph colouring concepts, a Graph Colouring based Dynamic Channel...
This paper introduces a novel Routing, Core and Spectrum Assignment (RCSA) algorithm based on the Connected Component Labelling (CCL) algorithm. The RCSA algorithm represents the spectrum of multicore fibers as matrices and the CCL algorithm discovers with low computational complexity the available spectrum to allocate to a connection request. Spectrum fitting policies are also proposed to be jointly...
It is known that by incorporating network function virtualization (NFV) in inter-datacenter (inter-DC) networks, we can use the network resources more intelligently to deploy new services faster. This paper considers an inter-DC elastic optical network (IDC-EON) and studies how to orchestrate the multicast-oriented NFV trees (M-NFV-Ts) in it efficiently. We first consider an offline scenario in which...
In Mobile Peer-to-Peer networks (MP2P), the network state information is difficult to measure accurately, and application requirement on quality of service (QoS) and trust is also hard to exactly express. Therefore, trust QoS routing scheme should be based on the fuzzy information. In this paper, we propose a trust QoS routing scheme based on interval matching. It applies the interval form to denote...
On the basis of the existing virtual network mapping algorithm, for the problems of mobile satellite virtual network mapping, such as greater network overhead and so on, proposed a mobile satellite network virtual mapping algorithm based on node risk. The algorithm judge the nodes' risk parameter, considered the threshold number of virtual nodes mapping and satellite nodes acceptance threshold, as...
Dynamic Adaptive Streaming over HTTP (DASH) enables the video player to adapt the bitrate of the video while streaming to ensure playback without interruptions even with varying throughput. A DASH server hosts multiple representations of the same video, each of which is broken down into small segments of fixed playback duration. The video bitrate adaptation is purely driven by the player at the endhost...
Wireless Cloud computing delivers the data and computing resources through the internet, on a pay for usage basis. By using this, we can automatically update our software. We can use only the space required for the server, which reduces the carbon footprint. Task scheduling is the main problem in cloud computing which reduces the system performance. To improve system performance, there is need of...
The millimeter wave (mmWave) bands are likely to play a significant role in next generation cellular systems due to the possibility of very high throughput thanks to the availability of massive bandwidth and high-dimensional antennas. Especially in Non-Line-of-Sight conditions, significant variations in the received RF power can occur as a result of the scattering from nearby building and terrain...
Today's networks are dominantly based on the Shortest Path First (SPF) routing algorithms. These algorithms assign weighting factors to links statically, such that the routing tables are recalculated only when a topology change occurs. As a result, the network traffic is often unevenly distributed, thus causing the congestion on some links even when the total traffic load is not particularly high...
We see a trend to design services as a suite of small service components instead of the typical monolithic nature of classic web services, which led to an increasing amount of long-tail services on the Internet. Deploying instances everywhere to achieve a fast response time results in high costs, especially when these services are used infrequently and remain idle most of the time. One way to avoid...
An environment-motivated real-time dynamic optimized bandwidth allocation algorithm for teleoperation of collaborative robots is presented in this paper. The proposed method is a progression of the work in [1] in which Interesting Events (IEs) occurring in the robotic swarm's environment and the change in the swarm's Quality of Collaboration (QoC) are utilized to solve the bandwidth management optimization...
In cloud data centers, it is a common practice to locate multiple virtual machines (VMs) in one physical host, in order to increase the resources' utilization. Several objectives may be considered when performing the placement of VMs, including: load balancing, energy consumption minimization, etc. Recently, generated network traffic with a given assignment of VMs is gaining interest and several studies...
The 3G and LTE technologies made video on-demand a popular entertainment for users on the go. However, bandwidth insufficiency is an obstacle in providing high quality and smooth video playout in cellular networks. The objective of the proposed PhD research is to provide a user with high quality video streaming with minimal stalling time by aggregating bandwidth from ubiquitous nearby devices that...
In the paper an FPGA-based dynamic model exact tracking control system of a permanent magnet synchronous motor is presented. The parallel processing of motor control system using modern FPGAs allows the complex servo algorithms to be proceeded within a microsecond. In the paper a novel current control principle for a drive with a PWM inverter is presented. The experimental results prove that the current...
Wireless NoC is becoming popular to be a promising future on-chip interconnection network as a result of high bandwidth, low latency and flexible topology configurations provided by this emerging technology. Nonetheless, congestion occurrence in wireless routers negatively affects the usability of high speed wireless links and considerably increases the network latency, therefore, in this paper, a...
Network bandwidth and server capacity are gradually becoming overloaded due to high demand and rapid evolution of high quality multimedia services over the Internet. Internet Protocol Television (IPTV) is among the multimedia services that demand more of network and server resources, especially with the emergence of Mobile IPTV. It is imperative for service providers to maintain good quality management...
Wireless NoC is becoming popular to be a promising future on-chip interconnection network as a result of high bandwidth, low latency and flexible topology configurations provided by this emerging technology. Nonetheless, congestion occurrence in wireless routers negatively affects the usability of high speed wireless links and considerably increases the network latency, therefore, in this paper, a...
Wireless sensor networks (WSN) nowadays are used in variety of applications having various quality of service (QoS) requirements. Hence they are required to provide different levels of Quality of Services based on the type of applications. As these Wireless Sensor Networks are constrained by the processing speed, memory capacity, energy more concentration is given in these area ignoring other parameters...
The aim of this research is to enhance the performance of a traditional Open Shortest Path First (OSPF) routing protocol network by adding some features of the Software Defined Networking (SDN) in a modified approach to improve some network's performance metrics like link congestion and bandwidth utilization. The improvement of those metrics leads to an improvement in the total throughput of the network...
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