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The fiber-wireless (FiWi) access network combines plenty of available bandwidth of the fiber network and the ubiquity and mobility of the wireless network, with the purpose to reduce their cost and complexity. The FiWi network is thought by many as a very promising architecture for the future network. From the standpoint of the Internet service provider (ISP), though the FiWi network has the advantages...
Multimedia traffic is expected to be widespread in next generation wireless networks, which will be likely based on Orthogonal Frequency Division Multiple Access. While multimedia content is heavily demanding in terms of network resources, it is also inherently adaptable at the application layer, thereby imposing soft QoS constraints, rather than strict requirements on a specific data rate. In this...
Dynamic spectrum auctions have been considered a promising approach to effectively re-distribute spectrum resources in the secondary spectrum market. However, the existing spectrum auctions are limited to allocating spectrum in units of channels. Recently software defined radio technologies make exciting progress in operating radios with variable bandwidths. They push the need for designing more flexible...
In this paper, we investigate the theoretical per-node transmission limit of hybrid wireless networks over fast fading channels. We first formulate a hybrid wireless network model, in which a wired network of base stations is deployed to support long-range communications between wireless nodes. Two types of transmission mode in hybrid wireless network, the so called intra-cell transmission mode and...
This paper proposes a joint power and resource allocation methodology, by using a node-centric scheme. Each node estimates the throughput Θ(ts) and tunes the proposed path-aware energy conservation mechanism, according to requested delay constrained resources, as well as the bandwidth resources that the associated channels can handle in time. The combined power and frequency bandwidth allocation scheme...
New integrated wireless and mobile networks are emerging to offer a wide range of services through heterogeneous networks anywhere at any time. The promotion towards these networks requires a user-centric approach which could enable users to control their terminal behavior in an efficient way. Each mobile terminal equipped with heterogeneous interfaces can access different network technologies and...
3D streaming over thin mobile devices is considered challenging due to the mobile devices' limited capabilities such as limited energy lifetime, processing power, storage capacity, and graphics' hardware and accelerator capabilities, that make it very difficult for mobile devices to render and process large and complex 3D scenes. To address this issue, 3D streaming techniques have been proposed that...
Recently, Orthogonal Frequency Division Multiple Access (OFDMA) transmission technique is applied widely in wireless networks because of its high transmission capacity. The IEEE 802.16 standard has also adopted the OFDMA as its access technique. However, the problem of bandwidth resource allocation in time and frequency is essential for efficient utilization of OFDMA system. In this paper, we proposed...
Applications consisting of messaging, voice, and video are used to provide situational awareness to decision makers and emergency responders in high criticality crisis scenarios such as disaster management. Here, ad hoc wireless networks are often quickly provisioned to provide the necessary connectivity to support these applications. Applications ill prepared to deal with the constant fluctuation...
Adaptive Bit Rate Streaming (ABR) has become a popular video delivery technique, credited to improving the quality of delivered video on wireless networks. At the same time, recent research has shown video caching in the Radio Access Network (RAN) can be a promising way to increase capacity of the network while reducing video latency and improving video quality of experience. In this work, we investigate...
The main focus of this paper is to show theoretically that power is a crucial factor in multi-radio multi-channel (MR-MC) wireless networks and hence by judiciously leveraging the power, one can realize a considerable gain on the capacity for MR-MC wireless networks. Such a capacity gain through power enhancement is revealed by our new insights of a co-channel enlarging effect. In particular, when...
We consider the problem of distributed admission control without knowledge of the capacity region in single-hop wireless networks, for flows that require a pre-specified bandwidth from the network. We present an optimization framework that allows us to design a scheduler and resource allocator, and by properly choosing a suitable utility function in the resource allocator, we prove that existing flows...
In today's Internet, New Reno is the most widely deployed connection oriented transport layer protocol. However, the performance of New Reno degrades significantly when New Reno operates in Multi-hop Wireless Networks (MWNs). Frequent retransmission timeouts, which is one of the well-known problems of the performance degradation of New Reno over MWNs. In MWNs, retransmission timeout is unavoidable...
Aggregating fractional bandwidth from multiple links in heterogeneous wireless networks can provide an opportunity for network providers to scale up capacity for multi-homed terminals. Multi-homed terminals come equipped with multiple interfaces, which can be used to transmit and receive data over multiple paths simultaneously. This can improve performance in terms of increased throughput, short delays,...
In this paper we investigate the problem of designing a spectrum scanning strategy to detect an intelligent Invader who wants to utilize spectrum undetected for his/her unapproved purposes. To deal with this problem we apply game-theoretical tools. We model the situation as a game between a Scanner and an Invader where the Invader faces a dilemma: the more bandwidth the Invader attempts to use leads...
Since many years there is a significant growth in the area of wireless networks. Secure communication is considered as an important requirement. The IEEE 802.11 standard identifies several security services such as encryption and authentication to provide a secure operating environment and to make the wireless traffic as secure as wired traffic. IEEE 802.11-based networks do not dispose of any reliable...
Streaming real time video over wireless networks cannot guarantee that all the frames could meet their deadlines. Wireless networks may suffer from bandwidth limitations. To reduce the streaming data over wireless networks, we propose a technique to identify, and extract the Region Of Interest (ROI), and drop the non-ROI from the frames that are between the reference frames. The Sum of Absolute Differences...
Given the locations of a small number of reference anchor nodes and the distances between neighbour nodes, various localization algorithms for wireless networks have been proposed. In this paper, we carry out a comparative evaluation of three different cluster based localization algorithms. The three different algorithms are based on the use of extended Kalman filter (EKF), semi-definite programming...
The efficiency of wireless technology depends upon the seamless connectivity to the user at anywhere any time. Heterogeneous wireless networks are an integration of different networks with diversified technologies. The most essential requirement for Seamless vertical handover is that the received signal strength should always be healthy. Mobile device enabled with multiple wireless technologies makes...
This article presents a novel architecture, namely, the border adaptive micro-base-station network, which can sufficiently meet the bandwidth requirement of future wireless networks. From the three screens convergence point, our goal is to make wireless services' performance match that of wired systems, instead of downgrading wired network applications to wireless level. Based on the analysis of Shannon...
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