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Millimeter wave (mmWave) communication is one solution to provide more spectrum than available at lower carrier frequencies. To provide sufficient link budget, mmWave systems will use beamforming with large antenna arrays at both the transmitter and receiver. Training these large arrays using conventional approaches taken at lower carrier frequencies, however, results in high overhead. In this paper,...
Managing VoIP service using QoS analysis is a vital issue for obtaining voice desired quality. Quality improvement and rational resource utilization are two parameters involved in determining VoIP service functionality. Which parameter outweighs the other one is a permanent challenge affecting developers' decisions. Hence every now and then different approaches are introduced impacting on VoIP service...
We present design, implementation, and an evaluation of an ant colony optimization (ACO) approach to flow routing in software-defined networking (SDN) environments. While exploiting a global network view and configuration flexibility provided by SDN, the approach also utilizes quality of experience (QoE) estimation models and seeks to maximize the user QoE for multimedia services. As network metrics...
In Distributed Virtualized Environment, service components on a dependable service path will be selected to implement service composition. Searching for the optimal dependable service path is the key to implement dependability assurance, which is a Multi-Constrained Optimal Path problem. However, the existing algorithms have disadvantages of high complexity and low performance, and lacking the consideration...
Cloud computing has made it feasible to access various IT resources through a high speed network from anywhere in the world. Constant increasing demand of cloud computing is equally popular in consumers as well as providers. But along with advancement every technology is also associated with some ill effects. On same path, cloud computing also accompanies a serious issue with it and that issue is...
For today the unit neural networks are widely used to solve various problems. In this regard the issue of developing learning algorithm that would be able to optimize the structure of neural networks dynamically is very important. The existence of such a method would allow the researcher to get the structure of the neural network that would be best-answered domain and available input data quickly.
Approximate computing is a paradigm for trading off program accuracy to save energy in memory or computational resources. However, determining feasible program approximations is difficult to achieve. Popular solutions involve programmer in annotating instructions or data that can be approximated. Recently, program testing based techniques have also been explored. But these are computationally expensive...
We investigate the QoE-centric heterogeneous network selection problem. Users usually struggle for the maximum throughput when select access network. However, compared to QoS-centric optimization mechanism, in order to get more rational allocation of resources and improve the resource utilization, we seek the QoE optimization method mechanism instead. The core idea of QoE-centric optimization is to...
Recently, great efforts have been devoted to the research of routing algorithms in delay tolerant networks, but existing works mainly focus on the positive social properties to design routing algorithms, in which nodes are supposed to be willing to help others carry and forward messages, few involve the negative social properties, such as selfishness. However, in reality, the resources of mobile nodes...
In fifth generation mobile network, Radio Access Network sharing is an attractive solution for operators to counter the traffic growth and build cost-effective networks in order to improve coverage and capacity at reasonable investments and operational costs. It consists of sharing radio access resources between two or more operators. In such multi-operator environment access selection decision is...
Seamless handoff in integrated satellite-terrestrial systems is one of the main challenges to achieve real anytime, anywhere communication. Multiple parameters have to be considered instead of only received signal strength. In this paper we propose two vertical handoff decision algorithms based on classical Multiple Attribute Decision Making (MADM) methods and fuzzy logic respectively. The algorithms...
In this paper we analyzed suitability of different routing algorithms for establishing bandwidth-delay constrained traffic tunnels in SDN backbone networks. Bandwidth rejection ratio was used as indicator of algorithm's ability to efficiently utilize network resources. Through set of simulations on two real backbone topologies we showed that network topology can affect algorithm's performance, and...
In order to improve the efficiency of web service composition based on traditional heuristic algorithm, this paper focuses on the web service composition method by merging genetic algorithm(GA) and ant colony algorithm(ACA). Firstly, this paper transforms web service composition into finding a QoS global optimal path, then obtains the initial pheromone distribution of ACA by running GA, finally works...
As an effective service mode, online auditing which serves the highest state audit institution is emerging as an important tool for national governance. However, as a crucial part during online auditing workflow, data stream processing has become one of the most important problems that restrains the development of online auditing. To address this problem, our study are primarily focusing on three...
Vehicular Ad-hoc Networks (VANETs) which nowadays showed distinct researches around the globe. Advancements in wireless networks globally, which gave a new dimension to researchers. This paper reviewed the basic concepts of VANET and clustering. It presented various types of clustering which could be implemented for the efficient running of VANET. Using static clustering dividing geographical city...
In this paper, we study the problem of jointing power and rate optimization in multi-channel Heterogeneous Cognitive Radio Networks (H-CRNs), where the Leader-Follower relationship between Primary Users (PUs) in macrocells and Secondary Users (SUs) in femtocells is modeled as a Stackelberg game. We formulate the problem of power allocation in primary networks as a Non-Cooperative Game, while formulating...
In this paper, a joint reducing energy consumption and improving quality of service scheme for the migration of virtual network resources is proposed. This migration algorithm reflects the state of the virtual network resources dynamically, and the algorithm consists of two parts: Energy-efficient Module and QoS Module. Each Module is responsible for a specific function. The Energy-efficient Module...
Relay node placement is one of the critical need of wireless sensor networks when connectivity, lifetime, fault tolerance like factors are desired in the network. In this study, we review the present relay node placement techniques and provide an overall view of this study by summarizing previous achievements. We categorize the placement strategies into four broad categories, namely, approximation,...
In view of the relevant requirements of different services in wireless multimedia sensor networks, after considering the parameters such as energy, time delay, hops and so on, we propose a Qos routing algorithm based on Ant Colony Optimization. This algorithm uses a different parameter weighting method for different service processes, which makes it the most suitable route for the service process...
The recent research trends have shown that ACO based routing is a research topic of high interest in Wireless Sensor Networks (WSNs). The literature found survey articles on ACO based routing algorithms for WSNs concentrates only on the parameter considered and method employed for pheromone update and decay in the algorithm. Authors could not find much survey article which clearly explains the content...
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