IMDEA Networks Institute Digital Repository
Not a member yet
1915 research outputs found
Sort by
EVM and RSSI Link Quality Measurements in Frequency Selective Fading Channels
Get PDFIn this paper, we discuss the suitability of error vector magnitude (EVM) and received signal strength indicator (RSSI) as wireless quality metrics. We evaluate these metrics in a software defined radio testbed and provide detailed measurement results for frequency selective fading channels. We show that EVM is well suited as a packet loss estimator and discuss a case where receiver implementation inefficiencies show up in the EVM.TRUEpu
Are trending topics useful for marketing?: visibility of trending topics vs traditional advertisement
Get PDFDOI: http://dx.doi.org/10.1145/2512938.2512948
ISBN: 978-1-4503-2084-9Trending Topics seem to be a powerful tool to be used in marketing and advertisement contexts, however there is not any rigorous analysis that demonstrates this. In this paper we present a first effort in this direction. We use a dataset including more than 110K Trending Topics from 35 countries collected over a period of 3 months as basis to characterize the visibility offered by Local Trending Topics. Furthermore, by using metrics that rely on the exposure time of Trending Topics and the penetration of Twitter, we compare the visibility provided by Trending Topics and traditional advertisement channels such as newspapers' ads or radio-stations' commercials for several countries. Our study confirms that Trending Topics offer a comparable visibility to the aforementioned traditional advertisement channels in those countries where we have conducted our comparison study. Then, we conclude that Trending Topics can be useful in marketing and advertisement contexts at least in the analyzed countries.TRUEpu
A Network Economic Game Theory Model of a Service-Oriented Internet with Choices and Quality Competition
Get PDFThis paper develops a new dynamic network economic model of Cournot-Nash competition for a service-oriented Internet in the case of service differentiation and quality competition. Each service provider seeks to maximize its own profit by determining its service volumes and service quality. We utilize variational inequality theory for the formulation of the governing Nash equilibrium as well as for the computational approach. We then construct the projected dynamical systems model, which provides a continuous-time evolution of the service providers service volumes and service quality levels, and whose set of stationary points coincides with the set of solutions to the variational inequality problem. We recall stability analysis results using a monotonicity approach and construct a discrete-time version of the continuous-time adjustment process, which yields an algorithm, with closed form expressions at each iteration. The algorithm is then utilized to compute the solutions to several numerical examples. A sensitivity analysis is also conducted.pu
OpenFlow Needs You! A Call for a Discussion About a Cleaner OpenFlow API
Get PDFSoftware defined networks are poised to dramatically
simplify deployment and management of networks.
OpenFlow, in particular, is becoming popular and starts being deployed. While the definition of the “northbound” API that can be used by the new services to interact with an OpenFlow controller is receiving considerable attention, the traditional,“southbound”, API that is used to program OpenFlow switches is far from perfect. In this paper, we analyze the current OpenFlow API and its usage in several controllers and show semantic differences between the intended and actual use. Thus, we argue for making the OpenFlow API clean and simple. In particular, we propose to mimic the process that exists in the Python community for deriving changes that result in a preferably only one, obvious way of performing a task. Toward this end, we propose three OpenFlow Enhancement Proposals: i) providing positive acknowledgment, ii) informing the controller about “silent” modifications, and iii) providing
a partial order synchronization primitive.TRUEpu
BGP Path Marking
No full textNetwork Working Group
Internet-Draft
Intended status: Standards Track
Expires: January 12, 2014
http://tools.ietf.org/html/draft-bgp-path-marking-00The potential advertisement of non-best paths by a BGP speaker supporting the add-path or the best-external extensions makes it difficult for other BGP speakers to identify the paths that have been selected as best by those who advertise them. This information is required for proper operation of some applications. Towards that end, this document proposes marking the paths using extended communities that encode the path type.pu
An Overview of Energy-efficient Base Station Management Techniques
Get PDFDOI: http://dx.doi.org/10.1109/TIWDC.2013.6664210
Print ISBN: 978-1-4799-0753-3Cellular networks have been traditionally dimensioned to fulfill the desired quality of service (QoS) requirements at all times, and consequently their deployment has been planned to meet the expected peak of the user demand. However, with the user demand recently increasing at exponential pace, concerns about the cellular networks energy consumption have been raised. In response, energy-efficient resource management schemes have been proposed, which take into account energy consumption, and control how much of the network infrastructure is actually needed at different times, and how much can be temporarily powered off to cut energy consumption. Since most of the energy consumed in cellular networks is used by base stations (BSs), algorithms for managing BSs seem to be the most urgent development to achieve energy-efficient operation. This paper provides a quick overview of the BS management techniques that were recently proposed for cellular networks. In addition, an outlook on real implementation aspects, including current commercial products, and trends in the development of energy-efficient hardware is also given.TRUEpu
Special section on pervasive wireless networking
No full textCorresponding and contact information:
Albert Banchs
Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganes (Madrid), SpainIt is our great pleasure to introduce this special section of the Journal, presenting advanced solutions for some of the key research challenges in wireless networks. The special section collects extended papers from the 13th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WoWMoM 2012. Future wireless networks will be highly heterogeneous, and will aim to provide users with pervasive communications facilities, requiring for this purpose that many different types of networking paradigms co-exist in harmony. Papers in this special section cover many of the most significant paradigms in this context, including vehicular networks, wireless infrastructure networks, mesh networks and self-organizing networks (supported by opportunistic networking technologies). In particular, the papers presented in this section address a selection of extremely important open issues, including the dissemination of safety messages in vehicular networks, the understanding and modeling of human mobility, the mitigation of collisions in WLAN, the issue of privacy in Wi-Fi as well as routing in multihop wireless networks.pu