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In this paper, we discuss and analyze results from real-world performance measurements of a two-hop mobile scenario in an IEEE 802.11p-based vehicular ad hoc network. We have used a roadside unit (RSU) mounted on a highway gantry as information source, and two vehicles equipped with on-board units (OBUs), acting as relay and destination node. We analyze performance gains in terms of coverage range...
In the design of Wireless Sensor Networks (WSNs), energy conservation is a goal at all system levels, from the application down to the hardware. This paper focuses on networklevel opportunities for energy conservation, with emphasis on the multi-hop transmissions, topology control and routing-level issues. Specifically, the paper considers energy efficient information broadcasting in WSNs deploying...
In future Internet architectures, Virtual Network Providers (VNP) must be able to compose virtual networks in a way that balances security with other priorities as expressed by Service Providers (SP). In this paper, we outline a framework in which a VNP can assess the security and assurance (robustness) properties of virtual networks and use these to help select an SP-appropriate topology. The topology...
With the basic features necessary to support Heterogeneous Networks now being incorporated into LTE-Advanced, the next step is to look forward to future evolution of Heterogeneous Networks. While active and extensive discussions are presently progressing in the 3GPP standards community, this paper first provides a review of the current LTE-Advance capability and specification support and an overview...
In this paper, a mathematical optimization formula for estimating the optimal channel dimensions of active transport molecular communication is presented. More specifically, rectangular channels with constant microtubule (MT) concentration are considered. It is shown, both using our formula and using Monte Carlo simulations, that square-shaped channels are optimal. Furthermore, when the value of time...
In this paper, we investigate multi-hop reliable data transfer for underwater acoustic networks. We propose a new protocol, called FOuntain Code based Adaptive multi-hop Reliable data transfer (FOCAR). FOCAR is essentially a hybrid ARQ scheme which integrates Fountain codes with hop-by-hop retransmission-upon-failure. It considers the half duplex nature of the underwater acoustic modems and adapts...
The rapid growth in mobile data traffic has posed great challenges for mobile operators; and mobile operators are looking for more cost effective solutions to deliver mobile data without compromising user experience. 3GPP has proposed several methods to selectively offload certain mobile data to alternative path without going through Evolved Packet Core (EPC) network to achieve CAPEX savings. We have...
Multiple Input Multiple Output (MIMO) adds a new dimension, the spatial one, to be optimized in Cognitive Radio (CR) by delivering service simultaneously to more than one user. In this paper, statistical optimization techniques are carried out to assess the Quality of Experience (QoE) performance where each type of users has different demands. The Multiuser scenario is considered where the transmitter...
Two-way real-time video communication in wireless networks requires high bandwidth, low delay and error resiliency. This paper addresses these demands by proposing a system with the integration of Network Coding (NC), user cooperation using Randomized Distributed Space-time Coding (R-DSTC) and packet level Forward Error Correction (FEC) under a one-way delay constraint. Simulation results show that...
LTE Advanced (LTE-A) small cells (pico cells) allow a smart densification of an existing macro cellular network. They are a means to cope with increasing traffic demands. They cover hotspots and support users in areas with otherwise bad service coverage. As they are surrounded by macro cells with a much higher TX power, higher antenna gain, and a much lower path loss, they offer a high transmission...
Inter-cell interference management is an notorious issue in cellular communication. Traditionally, static techniques were used to manage the interference: frequency reuse for GSM or universal reuse for CDMA. More recently, fractional frequency reuse for LTE has been common. Based on this idea, the next set of ideas consider coordination among base stations to dynamically manage the interference among...
Survivability is one of the key issues in Fiber-Wireless (FiWi) broadband access network since huge data loss could be caused by single segment failure. Previous schemes focus on protecting FiWi against single segment failure by deploying backup fibers. However, these schemes suffer from two key problems. First, they ignore optimizing the selection of backup ONUs, which determines the recovery delay...
An adaptive traffic estimation algorithm for an Auto-nomic Future Internet which can provide improved throughput, energy-efficiency and QoS guarantees is proposed. The theory for a Future Internet which supports multiple service classes, i.e., the traditional Best-Effort (BE) class and a new Essentially-Perfect-QoS (QoS) class, has recently been proposed. In this Future Internet, the routers give...
OS virtualization and cloud computing have radically changed the way Internet services are deployed: enterprises share third-party datacenters, deploying existing applications with minimal changes. Recent measurements reveal a lack of traffic isolation capabilities within the datacenter with network performance exhibiting high variability. We advocate addressing this problem by allowing applications...
In the OpenFlow based split architecture, data-plane forwarding is separated from control and management functions. Forwarding elements make only simple forwarding decisions based on flow table entries populated by the controller. While OpenFlow does not specify how topology monitoring is performed, the centralized controller can use Link-Layer Discovery Protocol (LLDP) messages to discover link and...
In this paper, the issue of non-cooperative, energy-efficient power control in a relay-assisted interference channel is considered. The energy efficiency of a given terminal is defined as the ratio between the throughput of that terminal and the consumed power. As far as the computation of the consumed power is concerned, not only the transmit power, but also the power dissipated in terminal's electronic...
Bulk data transfers account for a large portion of inter-datacenter traffic, such as backups, propagation of bulky updates and migration of data. These bulk data transfers not only consume massive inter-datacenter bandwidth, but also increase the transmission cost of datacenters. To solve this problem, we first employ the max-min fairness to the design of optimal multiple bulk data transfers scheduling...
Compressed sensing (CS) has recently emerged as a powerful signal acquisition paradigm. CS enables the recovery of high-dimensional sparse signals from much fewer samples than usually required. Further, quite a few recent channel measurement experiments show that many wireless channels also tend to exhibit sparsity. In this case, CS theory can be applicable to sparse channel estimation and its effectiveness...
Frequent topological changes due to high mobility is one of the main issues in Vehicular Ad-hoc NETworks (VANETs). In this paper, we model transmission probabilities of 802.11p for VANETs and effect of these probabilities on average transmission time. To evaluate the effect of these probabilities of VANETs in routing protocols, we select Dynamic Source Routing (DSR), Fish-eye State Routing (FSR) and...
The continual challenge for Wideband Code Division Multiple Access (WCDMA) communication networks is to provide increasingly higher data rates for more and more users for mobile broadband. Hence, WCDMA single-user and multiple-user capacity results are important references for practical WCDMA networks since they provide limits of performance to which practical systems strive to approach. Analysis...
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