IMDEA Networks Institute Digital Repository
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1915 research outputs found
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Lumen: Fine-Grained Visibility and Control of Mobile Traffic in User-Space
Get PDFhttp://cps-vo.org/group/satc-pi-meeting-17/program-agendaYour mobile phone hosts a rich array of information about you and your behavior. This includes a wide range of unique identifiers and sensitive personal information that enables online tracking, often times for delivering targeted advertisement. It is, however, striking how little insight and control we, as mobile users have into the operation and performance of our devices, into how (or whether) they protect information we entrust to them, and who they share it with. Further, it is not just regular users that are in the dark; much of the operation of mobile devices remains mysterious even to experts.
The ICSI Haystack project aims to overcome the limitations found on previous methodologies to better illuminate the mobile ecosystem at scale. At the core of the project is the Lumen app, available for free on Google Play. The app runs on the mobile phone itself and can comprehensively observe app, device and network activity. This will allow ICSI researchers to understand the operation, performance and personal information flow---including online third-party services collecting this information---at unprecedented scales with real user stimuli. Specifically, Lumen’s comprehensive vantage point facilitates four research thrusts: network performance analysis, mobile traffic characterization, analysis of the mobile tracking ecosystem, and mobile networking security assessment.FALSEpu
mm-Wave on Wheels: Practical 60 GHz Vehicular Communication Without Beam Training
Get PDFAt vehicular speeds, the contact time during which a mobile node is in range of a fixed road side unit (RSU) is short. While this is not an issue if the RSU only needs to deliver textual information such as traffic updates, short contact times become problematic when transmitting a large amount of information. For instance, an RSU may need to deliver high volumes of local navigation data for an augmented reality application, or video material regarding tourist information of a nearby town. Millimeter-wave (mm-Wave) communication is highly promising for such scenarios since it provides order-of-magnitude larger throughput than the existing technologies operating at lower frequencies. However, the contact time in mm-Wave vehicular scenarios becomes even shorter due to the directional nature of the communication. This raises a fundamental question: can the high throughput of mm-Wave make up for the reduction in the contact time? In this paper, we analyze this trade-off and design a first-of-its-kind practical mm-Wave vehicular testbed to evaluate the resulting performance. Specifically, we consider alternative locations for the RSU other than at the side of the road, such as on top of a bridge or inside a roundabout. Moreover, we leverage that the road implicitly determines the direction in which the RSU expects a car to be located. This allows us to use fixed beam-steering at both the car and the RSU, thus avoiding costly beam-training. We validate our approach in real-world vehicular scenarios with actual traffic in a mid-sized town in Spain. The results show that our fixed beam-steering approach enables the RSU to transmit large amounts of data in a very short amount of time for a wide range of speeds. This allows us to provide detailed insights into the aforementioned fundamental question regarding the use of mm-Wave in vehicular scenarios.TRUEpu
Scaling Future Wireless Networks
No full textThis article addresses the problem of increasing data traffic in wireless networks and how these networks can maintain the necessary performance despite changing conditions. The solution is the anticipation of increased data volume as well as the subsequent adaptation of the network to the new conditions. Using high frequencies in the millimeter-wave spectrum, he intends to ensure stable data rates, even under uncertain conditions at a correspondingly high level. An application currently being considered is the use of a wireless location system to easily align the millimeter-wave directional antennas with little effort.FALSEpu
Mobile Traffic Forecasting for Maximizing 5G Network resource Utilization
No full textThe emerging network slicing paradigm for 5G provides new business opportunities by enabling multi-tenancy support. At the same time, new technical challenges are introduced, as novel resource allocation algorithms are required to accommodate different business models. In particular, infrastructure providers need to implement radically new admission control policies to decide on network slices requests depending on their Service Level Agreements (SLA). When implementing such admission control policies, infrastructure providers may apply forecasting techniques in order to adjust the allocated slice resources so as to optimize the network utilization while meeting network slices’ SLAs. This paper focuses on the design of three key network slicing building blocks responsible for (i) traffic analysis and prediction per network slice, (ii) admission
control decisions for network slice requests, and (iii) adaptive correction of the forecasted load based on measured deviations. Our results show very substantial potential gains in terms of system utilization as well as a trade-off between conservative forecasting configurations versus more aggressive ones (higher gains, SLA risk).TRUEpu
Efficient Networking in Millimeter Wave Bands
No full textOne of the most promising options to significantly increase data rates in future wireless networks is to vastly increase the communication bandwidth. Such very high bandwidth channels are only available in the extremely high frequency part of the radio spectrum, the millimeter wave band (mm-wave). Upcoming communication technologies, for example IEEE 802.11ad, are already starting to exploit this part of the radio spectrum to achieve data rates of several GBit/s. mm-wave communication is also discussed as key technology for 5G mobile networks. However, communication at such high frequencies also suffers from high attenuation and signal absorption, often restricting communication to line-of-sight scenarios and requiring the use of highly directional antennas. This in turn requires a radical rethinking of wireless network design. On the one hand side, such channels experience little interference, allowing for a high degree of spatial reuse and potentially simpler MAC and interference management mechanisms. On the other hand, such an environment is extremely dynamic and channels may appear and disappear over very short time intervals, in particular for mobile devices. It is essential to take these characteristics into account to design efficient wireless architectures. The talk will highlight main challenges and possible solutions for networking in the mm-wave band.FALSEpu
Extending the IEEE 802.11ad Model: Scheduled Access, Spatial Reuse, Clustering, and Relaying
Get PDFMillimeter-wave technology is one of the main pillars of the future wireless networks. The main reason lies in the quantum leap of capacity it provides with respect to wireless networks operating in the sub 6-GHz band. Nevertheless, efficient and reliable communication in this band demands novel techniques to tackle all the associated barriers related to wireless propagation in those bands. In this paper, we present the extension of our ns-3 IEEE 802.11ad model and provide design and implementation details of the new techniques, including dynamic and static channel access schemes, decentralized clustering, beamformed link maintenance, spatial sharing, and half-duplex relay operation as defined in the IEEE 802.11ad amendment. We show how these techniques can boost and enhance wireless networking operation in the 60 GHz band. Our work is the first to implement these techniques in a networking simulator and make the implementation publicly available.TRUEpu
Demo: OpenVLC1.2 for Increased Data Rate with Embedded Systems
Get PDFhttps://doi.org/10.1145/3129881.3129895We introduce the OpenVLC1.2 platform for research in Visible Light Communication (VLC) systems. The platform builds on top of previous versions, that has attracted dozens of users from the research community. We maintain its advantages such as the support for communication with TCP/IP layers, software-based and programmable MAC and PHY layers, and low-cost front-end. In this new version, we make an effort to increase data rate and its overall
performance. OpenVLC1.2 is available to the research community.TRUEpu
A Programmable Buffer Management Platform
Get PDFBuffering architectures and policies for their efficient management constitute one of the core ingredients of a network architecture. However, despite strong incentives to experiment with, and deploy, new policies, the opportunities for alterating anything beyond minor elements of such policies are limited. In this work we introduce a new specification language, OpenQueue, that allows users to specify entire buffering architectures and policies conveniently through several comparators and simple functions. We show examples of buffer management policies in OpenQueue and empirically demonstrate its direct impact on performance in various settings.TRUEpu
Modeling the Evolution of Political Ideologies
Get PDFOur work intends to shed new insights into the debate of
polarization by using a multidisciplinary approach that
applies Evolutionary Game Theory to study the evolution of public ideology in US.
In particular, we use the replicator equation to model
political ideology as a dynamic game, where strategies
reproduce at a rate proportional to their payoffs.
Evolutionary game theory has explicit biological roots,
where payoffs represent fitness as the underlying process
of natural selection.
However, these models can also be thought of as models
of cultural evolution.TRUEpu