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Network Function Virtualization (NFV) enables flexible implementation and provisioning of network functions as virtual machines running on commodity servers. Due to the availability of multiple hosting servers, such network functions (also called Virtual Network Functions (VNFs)) can be placed where they are actually needed, dynamically migrated, duplicated, or deleted according to the current network...
This paper investigates the multi-broker based network control and management paradigm for realizing scalable and cost-effective service provisioning in multi-domain software-defined optical networks. Experimental results verify the feasibility of the proposal and demonstrate ∼ 7.6× blocking reduction comparing with the conventional single-broker based solution.
Current technologies to include cloud computing, social networking, mobile applications and crowd and synthetic intelligence, coupled with the explosion in storage and processing power, are evolving massive-scale marketplaces for a wide variety of resources and services. They are also enabling unprecedented forms and levels of collaborations among human and machine entities. In this new era, trust...
Dynamicity and infrastructure-less nature of MANETs expose the routing in such networks to a variety of attacks, and moreover, make the conventional fixed policy routing algorithms inefficient. To deal with the routing challenges and varying behavior of malicious nodes in such networks, employing reinforcement learning algorithms and proper trust models seem promising. In this paper, we introduce...
Live media streaming applications are increasingly popular, with services such as Twitch.tv and YouNow being used by millions of people. Deploying such services on the cloud can be very expensive, as the cost is proportional to the amount of data transferred to the users. However, adopting a much less costly peer-to-peer (P2P) solution may reduce the overall quality-of-service (QoS) experienced by...
In this paper, we propose an OpenFlow-assisted framework for P2P (peer-to-peer) live streaming, which incorporates an OpenFlow-assisted architecture and an OpenFlow-assisted algorithm. The architecture combines the characteristics and advantages of both BitTorrent system and OpenFlow network. The algorithm can dynamically calculate the path and corresponding available bandwidth for each flow according...
Currently, the contradiction between the rapid growth of network traffic and the limited network resource is plaguing network operators and Internet users. In this paper, we conduct a survey on how to build efficient streaming systems in edge network under SDN (software defined networking) architecture and on how to manage the large traffic in core network caused by file transferring and media streaming...
For P2P systems, one of the key challenges is to motivate peers to contribute to the system by sharing authentic files. Since the peers differ from each other in the quantity and quality of services they provide for the system, service differentiation is necessary for the sake of fairness. In this paper, a multidimensional contribution-based service differentiation mechanism is proposed. We first...
In this paper we present a system architecture for trust management inspired by a human model for the evaluation of trust. We focus on large-scale marketplaces for diverse software resources and services. In such marketplaces, user agents (consumer, provider and broker) are largely autonomous with vastly diverse requirements, capabilities, and trust preferences. We hypothesize the need for personalized...
P2P-based content request has been widely used because of its numerous advantages, such as flexibility, load distribution, efficiency and so on. However, there are still some problems to be solved such as service stability, adaptation and so on. The fragmentation methods used in existing P2P systems are generally fixed block-size method or fixed duration method, which have significantly different...
In recent years, there have been significant efforts to standardize a routing protocol for Low-power and Lossy Networks (LLNs). This effort has culminated in standard IPv6 routing protocol for LLNs (RPL). The main interest of RPL is to improve routing in an LLN minimizing the usage of network resources. For this, RPL builds acyclic graphs and applies an Objective Function (OF) which is responsible...
Internet of Things (IoT) applications consist of diverse Things (sensors and devices) in terms of hardware resources. Furthermore, such applications are characterized by the Things' mobility and multiple interaction types, such as synchronous, asynchronous, and streaming. Middleware IoT protocols consider the above limitations and support the development of effective applications by providing several...
This paper considers the problem of managing and maintaining the quality in communication networks. The significance of the end-to-end quality control on all network layers is shown. The problem of projection of the quality of experience requirements posed by customers on the plane of quality of service metrics is stated. Multilevel quality relationship model corresponding to the current state-of-the-art...
Peer-to-Peer(P2P)-based Video-on-Demand application has gained more attentions recently. Due to the system complexity, there are still many challenges for practical deployment such as peer selection. Previous works focused on how to find the most suitable service or the request response scheme on the peer-side. In this paper, we study the request response scheme on the server-side by discussing three...
As many online systems rely on user ratings for making decisions such as recommendations, the quality of such rating scores are increasingly important. On the other hand, users interact with each other via online communities. How such interactions affect the trueness of their ratings? Can we obtain the true rating scores that exclude the influences among users? This paper presents a conceptual framework...
Apache Cassandra is a distributed database of choice when it comes to big data management with zero downtime, linear scalability, and seamless multiple data center deployment. However, resource allocation for the system during deployment is a major issue which could either lead to bad performance or under-utilization of resources. In this paper we describe a QoS-aware architecture that manages resources...
Peer-to-peer (P2P) live streaming systems rely on utilizing peers' free resources to alleviate the load on streaming servers. In these systems peers join and leave the overlay based on interest in the stream and streaming quality. Therefore, to ensure scalable streaming a large number of stable peers are required in the system. In this work we propose an overlay management strategy to improve peer...
The future generation of wireless networks is expected to support a significantly large amount of mobile data traffic, massive number of wireless connections and devices, achieve better cost, increased energy and spectral efficiency, improved quality of service (QoS) in terms of communication delay, capacity, reliability and security. The main techniques that will enable these features are massive...
Monitoring the global state in peer-to-peer networks through decentralized mechanisms allows targeted optimization and improvement of the peer-to-peer network. However, malicious nodes could aim to distort the process of gathering the global state through monitoring. In this paper we propose DOMiNo, a security solution for tree-based peer-to-peer monitoring mechanisms. It passively listens to incoming...
Peer organization is one of the most important issues in peer-to-peer (P2P) video streaming systems. Free-riding extremely reduces the overall performance of these systems. The peers placed closer to the video source will have a higher quality of service. Therefore, we can mitigate the free-riding effect and encourage peers to increase uploading participation by putting peers with more upload bandwidth...
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