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Future Network & Mobile Summit (FutureNetw), 2012

Date 4-6 July 2012

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Displaying Results 1 - 25 of 85
  • [Title page]

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    Freely Available from IEEE
  • [Copyright notice]

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    Freely Available from IEEE
  • Towards spectrum micro-trading

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (279 KB) |  | HTML iconHTML  

    Spectrum trading is an important tool to increase overall spectrum utilization and to open up opportunities for businesses to get access to desired spectrum. It has been implemented in some countries for some spectrum bands. At the same time, systems and architectures for cognitive radio technologies are being developed that are able to dynamically use spectrum bands in more flexible manners including functionalities such as dynamic bandwidth, spectrum band concatenation, sensing, channel switching and cognition. However, the current spectrum trading regimes usually require long times to execute a trade, hence limiting the flexibility over short time scales. In this paper we study spectrum micro-trading as a concept to enable trading of spectrum at the micro scale in at least three dimensions; on the micro-spatial, micro-temporal and micro-frequency scale. The ecosystem required for spectrum micro-trading and the most important metrics are defined; market viability, spectrum utilization, channel quality and social welfare. Furthermore, we propose a model for spectrum micro-trading, the Micro-trading Pixelation Model, which addresses the three dimensions on the micro scale. We then discuss the main challenges and issues that have to be solved for the realization of spectrum micro-trading with the proposed model. Finally, some initial simulation results are provided to demonstrate the performance of spectrum micro-trading. View full abstract»

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  • Real-time 11.25Gb/s optical OFDM signal transmission over 2000m legacy MMFs using centre launching

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (287 KB) |  | HTML iconHTML  

    In directly modulated VCSEL (DM-VCSEL)-based, end-to-end real-time, 11.25Gb/s optical OFDM (OOFDM) systems utilizing legacy OM1/OM2 multimode fibres (MMFs) as well as simple intensity-modulation and direct-detection (IMDD), detailed experimental explorations are undertaken, for the first time, of the effectiveness of various optical launching conditions including centre launching and conventional offset launching in maximizing the transmission distances of the legacy MMF systems. It is shown that, in the aforementioned legacy MMF systems, centre launching enables an adaptive power-loaded 11.25Gb/s OOFDM transmission over an unprecedented distance of 2000m with an optical power penalty as low as 0.8dB. When centre launching is replaced by conventional offset launching, the transmission distance of the legacy MMF system is reduced to 300m and the corresponding optical power penalty is increased to 2.3dB. Comparisons of measured maximum achievable transmission distances of various MMF IMDD system configurations subject to different launching conditions show that DM-VCSEL-based, adaptive power-loaded OOFDM at centre launching is a viable and cost-effective solution for use in legacy MMF systems. This work may have great potential for upgrading installed MMF local area networks to 10Gb/s and beyond. View full abstract»

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  • Modelling quality of experience in future internet networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB) |  | HTML iconHTML  

    The race to the Future Internet entails challenging objectives and requires novel approaches to well knows issues. Dissimilar approaches have been investigated such as network-, user- and content centric networks. All of them try to improve the end user Quality of Experience, while guaranteeing Quality of Service. The present work introduces a novel QoS-QoE dynamic correlation called AQS hypothesis and defines a model to calculate active and passive QoE and to determine the end user fairness and sensibility. A prototypal implementation on an Android OS shows how an ICT actor (network, service and content providers) can control the end user QoE providing the best matching QoS, for each class of service and for each class of users, thus saving precious resources. View full abstract»

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  • Multi-antenna cyclostationarity feature detection for parallel sensing in cognitive radio

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (250 KB) |  | HTML iconHTML  

    This paper proposes a new approach which enables cognitive radio systems to perform parallel sensing. Thanks to the spatial rejection capabilities of antenna processing and to the a priori knowledge of the cyclostationarity properties of the incumbent Radio Access Technology (RAT), an opportunistic user can perform periodic in-band sensing to detect a potential incumbent system without having to insert quiet periods on its waveform. View full abstract»

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  • Femtocell-based capacity extension of wireless access infrastructures

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (337 KB) |  | HTML iconHTML  

    The exponential increase in the requests of demanding services has lead current networks to their limits. As a result there is need to handle the increased traffic. This work focuses on the solution of Opportunistic Networks (ONs) which are operator-governed, coordinated extensions of the infrastructure. More specifically a macro base station (BS) is considered that faces congestion issues. A proportion of the macro-terminals will be redirected to nearby femtocells forming an ON. Femtocells are low-power BSs that exploit the backhaul network of the end-user, e.g. an ADSL line, to communicate with the operator. This paper aims at solving the complex optimization problem of resource allocation to femtocells. Thus, an innovative greedy algorithm is proposed, namely the Dynamic Resource Allocation (DRA) algorithm. The algorithm allocates power levels to femtocells in order to cover the most terminals possible but with the minimum transmission power possible. In addition, it utilizes an assignment algorithm to distribute terminals to femtocells and QoS to terminals. Finally, the algorithm is validated through a Java-based platform and is compared with the well-known Simulated Annealing and Tabu Search algorithms. View full abstract»

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  • Spectrum aware routing in ad-hoc cognitive radio networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (281 KB) |  | HTML iconHTML  

    The paper discusses spectrum aware routing in an ad-hoc cognitive radio network architecture that exploits television white spaces, under the spectrum of commons regime. Vital part of this network architecture is a novel routing protocol that coordinates data flows and establishes optimum routing paths among secondary users with heterogeneous spectrum availability. Efficient protocol operation as a matter of maximum-possible routing paths establishments and minimum delays is obtained by a coordination mechanism that was implemented based on a simulation scenario. The validity of the proposed approach is verified via a number of experiments, under controlled simulation conditions and the performance of the proposed protocol is evaluated considering delay metrics. View full abstract»

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  • Environment aware spectrum shaping for cognitive radio systems

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (334 KB) |  | HTML iconHTML  

    The coexistence of OFDM-based cognitive radios (CRs) with licensed wireless systems puts strong attention on protection of primary links. In this paper, we have shown how environment-aware CR can calculate protection requirements for Out-of-Band (OOB) radiation attenuation on the basis of licensed users' receivers characteristic. In dynamically changing environment this approach can provide significant advantage over classical static spectrum masks. In the second part of this paper we have investigated how the calculated OOB attenuation requirement can be obeyed by OFDM system employing combination of windowing and cancellation carriers (CCs) shaping methods. We have shown how the transmitter can estimate a spectrum shape before any OFDM symbol being sent. On this basis the CR will not operate until spectrum shaping mechanisms fulfil the requirements. The calculations and simulations were carried for a wireless microphone being licensed system as the application of the CR in the UHF band is the most probable. View full abstract»

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  • A spectrum selection framework for Opportunistic Networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB) |  | HTML iconHTML  

    This paper presents a framework for including cognitive management functionalities in the spectrum selection process for Opportunistic Networks (ONs).The framework is based on a decision making functionality interacting with a knowledge management block that stores and processes information about the spectrum use. Different approaches for spectrum selection are discussed covering specific cases including the capability to aggregate different bands and the possibility to jointly select the spectrum and the network interface. Illustrative results of the proposed framework are presented. View full abstract»

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  • A global customer experience management architecture

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (279 KB) |  | HTML iconHTML  

    The quality of experience (QoE) is one of the main research lines in ITC industry, which seeks to manage quality as perceived by users. This document analyzes and describes requirements of a QoE driven management system architecture, which has been designed in the Celtic IPNQSIS project. The architecture is grouped into different levels: Data acquisition level, Monitoring level and Control Level. Each level comprises a specific set of capacities, such as Data collector, or Traffic Monitor amongst others. The architecture described in this paper constitutes the guidelines of the IPNQSIS project in terms of a QoE ecosystem that will settle the basis of global customer experience management architecture. View full abstract»

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  • Power consumption measurements of access networks in a wide geographical area test bed and economic perspectives

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (644 KB) |  | HTML iconHTML  

    In this paper we report the results about power consumption measurements on devices belonging to the access part of a wide geographical network test bed. The access part consists of both xDSL and Passive Optical Network (PON) systems. The results show how energy saving could be a method for returning from the investments for fibre optics installation. View full abstract»

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  • SVC multicast video mobility support in MEDIEVAL project

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB) |  | HTML iconHTML  

    The foreseen explosion in online video traffic over the upcoming years has left current mobile operators struggling to maximize their networks capacity and efficiency. MEDIEVAL project aims to evolve existing architectures through relevant cross-layer interactions, permitting to deliver expected QoE levels to users. In order to alleviate the impact of online video which potentially could be shared by a group of users in the core network, as well as maximize transport efficiency, the utilization of multicast and broadcast mechanisms is proposed. Moreover, the combination of multicast and network-based mobility protocols results in new problems which must be solved necessarily through network support. By using multicasting SVC, where a video is composed by one base layer and possibly multiple dependent enhancement layers, a single session may traverse the whole core and be adapted to the different terminal's characteristics. In this article, we present the research being developed towards mobile multicast support in future networks, describing solutions for improving wireless access efficiency (in 802.11 and LTE), and for enabling IP multicast mobility support. Furthermore, the end-to-end (e2e) support provided by MEDIEVAL in a SVC-based Personal Broadcast Service (PBS) scenario is analyzed, where both mobile multicast listeners and sources participate. The interfaces enhancing mobile video support are examined, along with the key exchanged parameters. View full abstract»

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  • Power control and management in the NetFPGA gigabit router

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    Improving energy efficiency in Internet equipments is becoming an increasingly important research topic. In this paper, we discuss the lesson gained by experimenting a power management mechanism aimed at reducing the power consumption while guaranteeing the Quality of Service (QoS). To this purpose, we drive the clock frequency of an open flexible and high-performance router, the NetFPGA, according to the measured input bit rate. An evaluation of the proposed power management policy is provided. View full abstract»

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  • Advanced relaying concepts for future wireless networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (254 KB) |  | HTML iconHTML  

    Relaying is undoubtedly a key technology for future wireless networks as it can be applied to provide coverage extension and capacity increase in a cost-effective manner. This paper presents an outline of the major advanced relaying concepts that will be part of future systems from the viewpoint of the ARTIST4G European project. These concepts can be divided into three categories, those pertinent to type-1 relays, type-2 relays and moving relays. The characteristics of each of these concepts are presented and the challenges related to their implementation are discussed. Furthermore the paper proposes a set of solutions to address the discussed challenges. For type-1 relays, the paper presents solutions for the allocation of resources to the backhaul and the access links, the inter-relay interference mitigation, and the multi-hop transmission mode. For type-2 relays, our focus is on the design of distributed hybrid automatic repeat request (HARQ) protocols. More specifically, we propose that the conventional HARQ schemes are adapted to exploit the potentially better channel conditions provided by the relays. Moreover distributed turbo coding solutions are introduced for increasing transmission reliability with the aid of relays. Finally, moving relays are presented as an efficient solution to the ever-growing demand for wireless broadband by users within public transportation vehicles. We show that moving relays can very effectively overcome the vehicle penetration loss and boost the achievable capacities of the vehicular users. Overall, we conclude that the presented advanced relaying concepts are very promising and can significantly enhance the user experience in future wireless networks. View full abstract»

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  • Research and experimentation with the HIMALIS network architecture for future internet

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (543 KB) |  | HTML iconHTML  

    There are many projects in the search for Future Internet (FI), supported by many countries and with different fundamental targets. This paper is centered around the HIMALIS architecture proposed as part of the AKARI project by the NICT of Japan. We describe this architecture and discuss its research and experimentation capabilities, finally showing its behavior in a scenario with heterogeneous underlying networks and handover events (mobility). View full abstract»

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  • Cross-platform demonstrator combining spectrum sensing and a geo-location database

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3899 KB) |  | HTML iconHTML  

    After the digital switchover, a secondary access of the so-called TV White Spaces should not interfere with primary users, such as DVB-T systems and local wireless microphone devices. One consensual method for secondary spectrum users to avoid interference is to combine geo-location database with spectrum sensing. This paper describes an experimental platform that combines wireless microphone sensors with a web-based geo-location database access. Software defined radios and Internet technologies are the enabling tools in use. From test trials in a real scenario, the platform was capable to update a list of vacant channel from the geo-location database, using reliable information from blind sensing algorithms. View full abstract»

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  • A new inter-networking architecture for mobile oriented internet environment

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB) |  | HTML iconHTML  

    Internet environment is rapidly being migrated towards `mobile', but the current Internet was historically designed for `static' environment and thus it is inevitably subject to architectural limitations in the mobile-oriented Internet environment. In this paper, we propose a new inter-networking architecture for the mobile-oriented Internet environment. For this, we first identify a set of requirements by analyzing the problems of the current Internet in the viewpoint of mobile-oriented Internet environments. Based on the requirements, we describe the proposed architecture with the three functional building blocks: Host ID and Local Locator (HILL), Dynamic and Distributed Mapping System (DDMS) and Query-First Data Delivery (QFDD). Finally, the proposed architecture is compared with the existing ones in various aspects. View full abstract»

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  • Architecture for adaptable QoE-centric mobile video delivery

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (235 KB) |  | HTML iconHTML  

    In this study we present a video delivery architecture that supports both content and streaming adaptations of video services over a video QoE aware network. It is aimed to resolve conflicts between video services competing for shared resources while optimizing the global QoE of these services. The individual streams are adapted, primarily by reducing their requirements but increasing the perceived QoE. View full abstract»

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  • Adding mobile base station support to PONs

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (327 KB) |  | HTML iconHTML  

    The continuing deployment of fiber in the local loop, presents an obvious opportunity to also provide backhauling to mobile base stations in the vicinity of Passive Optical Networks (PONs). To exploit this synergy, one must fully exploit the existing PON MAC tools and also ascertain that certain extreme performance requirements arising from the mobile traffic support can be met by the shared PON medium. This dual objective is addressed in this paper with performance simulations evaluating the most demanding scenario in terms of latency: i.e. that of the hard-handover exchange of messages via one PON over the core network. Also MAC fine-tuning techniques that can improve latency as well as system utilization in the presence of mobile traffic are presented and assessed. View full abstract»

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  • Dynamic management of cooperative communications in Body Area Networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (451 KB) |  | HTML iconHTML  

    In this paper, the impact of cooperative mechanisms on medium access control protocol is evaluated in terms of end-users Quality of Service (QoS) and energy consumption. A dynamic and efficient management of cooperative strategies based on beacon reception information is proposed. The aim is to guarantee satisfying end-users QoS (low packet error rate, low latency) and to minimize the energy consumption. The performance analysis is based on measured time-variant BAN channels at 2.45 GHz. View full abstract»

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  • Concept for an M2M communications infrastructure via airliners

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1168 KB) |  | HTML iconHTML  

    A new concept for Machine-to-Machine (M2M) communications infrastructure via airliners is presented. The main principles and resulting challenges are described. A first study on possible coverage within Europe and North America using airliners endorses the concept's feasibility. Furthermore, system dimension aspects are investigated in a proof-of-principle manner to understand its feasibility. All commercial flights during 24 hours were considered on the basis of real global flight data. Paper's goal is stimulating further research activities and ideas in this area. View full abstract»

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  • Secure broadcasting in cooperative cognitive radio networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1583 KB) |  | HTML iconHTML  

    This paper explores the trade-off between cooperation and secrecy in cognitive radio networks. We consider a scenario consisting of a primary and a secondary system. In the simplest case, each system is represented by a pair of transmitter and receiver. We assume a secrecy constraint on the transmission in the sense that the message of the primary transmitter has to be concealed from the secondary user. Both situations where the secondary transmitter is aware and unaware of the primary message are investigated and compared. Furthermore, we extend our results to the scenario where the secondary system comprises multiple users. For each case we sketch the derivation of the rates that are achievable from an information theoretic perspective. We then investigate the findings by numerical simulations. Our main result is that, in spite of the secrecy constraint, cooperation is beneficial in terms of the achievable rates. The secondary transmitter has the two contradicting tasks of helping the primary system and transmitting its own message. Our results show that both tasks can be accomplished simultaneously, improving both systems' performance. In particular, the secondary system can achieve a significant rate without decreasing the primary rate below the benchmark rate achievable without the help of the secondary transmitter. In the case of multiple secondary users, the rate region reduces, which results in a lower individual rate. However, the linear increase in sumrate counterbalances this effect. View full abstract»

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  • On converged multidomain management of connectivity in heterogeneous networks

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB) |  | HTML iconHTML  

    We describe an advanced concept and its experimental realisation for open connectivity services to cope with the complexity of multi-technology networks, especially with regard to control, management and algorithmic flexibility across layer-3 routing, layer-2 switching and in future even optical switching. We introduce a unifying control element in each supported network domain called the Domain Control Unit (DCU) that separates the control functions from the data forwarding functions by concentrating most of the control plane mechanisms and intelligence in a single entity. The DCU incorporates PCE-like components for path computation and OpenFlow-like dynamic flow control to enforce the forwarding adjacencies in the switching or routing network. Additionally, the DCU provides intra-domain communication to the packet-forwarding network elements (e.g. routers, switches) in order to collect topological information and to react properly in case of failure. The persistency of the topology and resource information of the network is ensured by a traffic engineering database. The DCU also supports the inter-domain communication between several domain controllers. For experimentation purposes we followed an OpenFlow-like approach to realize a flexible and extensible test installation of the DCU networking concept. This enabled us to demonstrate intra- and inter-domain path computation and flow establishment in a mixed environment of cooperating (layer2) switches and (layer3) routers in virtual and physical networks, as it is common in the context of interconnectivity of large distributed data centers and cloud centers. View full abstract»

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  • A five year perspective of traffic pattern evolution in a residential broadband access network

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1302 KB) |  | HTML iconHTML  

    In this paper we describe a systematic study on long-term evolution of residential broadband Internet traffic covering 5 calendar years from June 2007 to May 2011. The traffic evolution is characterized both in the term of the total traffic volume, as well as the traffic volumes and shares for different application categories (file sharing, video streaming etc.), with the focus on comparing the traffic on the per IP user basis and among different broadband subscription groups. The results show that the average daily total traffic generated by each private end user increased only by about 33 % during the past 5 years. Further, the results show that the P2P file-sharing has been dominating the network total traffic, but the daily file-sharing traffic volume per end user largely remains the same. Also, the daily streaming-media traffic volume per end user has increased dramatically by over 500% during the studied period of time. In the meantime, the daily web-browsing traffic volume per end user has increased by about 300%. Finally, a further investigation among 4 different FTTH broadband subscription groups with 1, 10, 30, and 100 Mbit/s symmetric access speeds shows that the lower the access speed, the more diversified the end user traffic tend to be. View full abstract»

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