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Network virtualization has become one of the most prominent solutions that can efficiently deal with the dramatic increase of data demand in mobile networks. In order to allow multiple virtual networks to coexist in the same substrate network, the need for development of efficient virtual network embedding algorithms and techniques is imperative. The main purpose of this paper is to provide an optimization...
Different services have different requirements in failure recovery. However, in the current network, the failure recovery schemes generally handle all the traffics in the same manner, which is inefficient. Software Defined Networking (SDN) enhances network flexibility by centralized control of traffics and resources. In this paper, we develop a Declarative Failure Recovery System (DFRS) for customized...
In this paper, we propose methods to enable efficient data delivery in vehicular ad-hoc networks (VANETs). We target scenarios where data are collected by vehicles and need to be transmitted. Dynamic clusters are formed while vehicles move in order to make data transmissions more robust and scalable. We use mathematical optimization solutions to optimize transmission scheduling so as to maximize throughput...
Cooperative transmission can significantly reduce the power consumption associated with long distance transmission in wireless sensor networks (WSNs). In this paper, we analyze the optimal power consumption of cluster-based multi-hop transmission for a cooperative WSN. With specific Quality of Service (QoS) constraints on delay and channel capacity, we show that the power optimization problem of the...
In this paper, we consider a small cognitive wireless network operator (SCWNO) that provides machine-to-machine (M2M) communications by utilizing TV white spaces (TVWS) and lease high priority channels (HPC) at a cost to achieve better quality-of-service (QoS). We study the economic viability of SCWNO by considering the cost of leasing HPC, delay in data transmission, and quality of data. When the...
The recently-proposed centralized cloud radio access network (C-RAN) promises to deal with the ever-increasing traffic volume and reduce network cost by centralizing the baseband operation and simplifying radio access points. However, compared with traditional radio access network, whether it always has performance gain, and how large the gain will be are still open questions. This paper presents...
Future Internet projects such as MobilityFirst and Named Data Networking have proposed novel mechanisms to replace the Internet Protocol to better support content delivery and mobility. However, the problem of efficient data transfer across the network core has not been adequately investigated. We tackle the challenge of inter-domain cut-through switching using software-defined networking (SDN). First,...
We introduce an optimisation problem to maximise the throughput of class of rateless codes subject to a delay constraint for a point to point erasure packet channel with delayed feedback. We show that this problem is convex. Using the formulation for point to point communication, we extend our approach to the communication of multiple unicast flows in a network.
In this paper we address the impact of the security cost in terms of energy consumption, processing time, and traffic load on quality of services (QoS) in Wireless Sensor Networks (WSNs). Offering security services (authentication, confidentiality, and integrity) and QoS (throughput, delay, and reliability) guarantee in WSNs is still challenging issue. The security and QoS are opposite parameters,...
To guarantee Quality of Experience (QoE) for video streaming services in a future Internet architecture, Content Centric Network (CCN), Dynamic Adaptive Streaming via HTTP (DASH) technology is used to deliver the proper video content according to the network situation. However, CCN enables a host-to-content communication model and has a universal caching design, which seriously decreases the performance...
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