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Communications Workshops (ICC), 2011 IEEE International Conference on

Date 5-9 June 2011

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Displaying Results 1 - 25 of 83
  • [Title page]

    Publication Year: 2011 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2011 , Page(s): 2
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  • Greetings from General Chair

    Publication Year: 2011 , Page(s): 3
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  • Greetings from the Executive Chair

    Publication Year: 2011 , Page(s): 4
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  • Greetings from the TPC Chair

    Publication Year: 2011 , Page(s): 5
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  • Organizing Committee/Advisory Board

    Publication Year: 2011 , Page(s): 6 - 7
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  • A Novel Virtualized Presence Service for Future Internet

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    Network virtualisation is an emerging technology for the future Internet. It enables the co-existence of several network architectures on a single substrate, and eases the introduction of new functionalities. The expected benefits include an optimal usage of resources and flexible service provisioning. Presence service enables the discovery, retrieval of and the subscription to changes in end-user context information. It is the basis of a wide range of Internet applications. Its usage is expected to grow significantly, and so it needs be developed further, in line with the continuing development of the Internet. This paper proposes a novel architecture for a virtualized presence service for the future Internet. The architecture is composed of three layers (a virtual presence service layer, a presence service virtualisation layer, and a presence substrate layer) and two planes (presence service and virtualization control and management). The subjacent business model, the overall architecture, the functional entities and the interfaces are discussed and illustrated by concrete scenarios. View full abstract»

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  • Achievable Rates for Lattice Coded Gaussian Wiretap Channels

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    This paper uses a nested lattice chain to perform lattice coding and decoding for a Gaussian wiretap channel, in which we derive the achievable rates and the equivocation rate. We also show that it is possible to achieve the equivocation rate of the classical Gaussian wiretap channel, and meet the reliability and security criteria using the nested lattice construction. View full abstract»

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  • An Accurate Closed-Form Approximation of the Energy Efficiency-Spectral Efficiency Trade-Off over the MIMO Rayleigh Fading Channel

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (203 KB) |  | HTML iconHTML  

    Energy efficiency (EE) is gradually becoming one of the key criteria, along with the spectral efficiency (SE), for evaluating communication system performances. However, minimizing the EE while maximizing the SE are conflicting objectives and, thus, the main criterion for designing efficient communication systems will become the trade-off between SE and EE. The EE-SE trade-off for the multi-input multi-output (MIMO) Rayleigh fading channel has been accurately approximated in the past but only in the low-SE regime. In this paper, we propose a novel and more generic closed-form approximation of this EE-SE trade-off which exhibits a greater accuracy for a wider range of SE values and antenna configurations. Our expression, which can easily be used for evaluating and comparing the EE-SE trade-off of MIMO communication system, has been utilized in this paper for analyzing the impact of using multiple antennas on the EE and the EE gain of MIMO in comparison with single-input single-output (SISO) system. Our results indicate that EE can be improved predominantly through receive diversity in the low-SE regime and that MIMO is far more energy efficient than SISO at high SE over the Rayleigh fading channel. View full abstract»

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  • An Algorithm for Content Mobility in a Future Internet Architecture

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2216 KB) |  | HTML iconHTML  

    Access and consumption of information is the primary use case for the Internet today. People are using more and more mobile devices to access any kind of information, while the information itself is mostly stored on immobile servers. This work focuses on another aspect of mobility, namely content mobility. Together with the idea of locator/identifier separation we present an algorithm that allows single content objects to be automatically relocated and replicated in order to improve content dissemination. We are optimizing the costs for content delivery from the network's point of view and provide simulation results. View full abstract»

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  • An Entropy-Based Energy Consumption Analysis of a Network

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (166 KB) |  | HTML iconHTML  

    The energy consumption by the Internet is rising at an unprecedented rate. Future networks should be able to provide the means for meeting this energy demand. Numerous researches have been carried out to understand the energy consumption level of a network. However, there are few approaches to develop a metric that indicates and analyzes the energy consumption level of a network based on its topological structure. In this paper we propose an entropy-based metric that can be applied for the evolution of energy efficiency in the future Internet. With the proposed entropy-based metric, we analyze the energy consumption levels of various networks that have different topological structures. Moreover, we demonstrate that the entropy-based metric has a positive linear relation with the energy consumption level of a network with intensive simulation studies. View full abstract»

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  • An Ontology-Based Framework for Autonomic Classification in the Internet of Things

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    The advent of ontology systems has brought inference capabilities to database systems. Also, the number of interconnected objects is constantly growing, thus forming a new paradigm for the Internet of the future, where not only will any single device be accessible and usable from anywhere and at anytime, but also, the system will be able to self--organize and adapt to external agents. This paper focuses on the description and the realization of an ontology system for wireless sensors and actuators networks dealing with heterogeneous device integration and composite event detection. The system has been developed with widely accepted tools such as protege and Pellet and has been implemented on the server of a wireless sensor network testbed that features 350 devices and is fully IPv6 compliant. The main features of the proposed system are the complete interoperability thanks to the support of advanced web languages on constrained devices, the capability of classifying any node of the network according to its sensors and its geographic position, and a general method for detecting events and anomalies among the data collected by the network. Finally, the paper provides evidence of the viability of the approach by describing its implementation and showing the results of a first experimental campaign. View full abstract»

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  • An Optimization Approach to Joint Cell and Power Allocation in Multicell Networks

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (193 KB) |  | HTML iconHTML  

    Since the seminal paper by Knopp and Humblet that showed that the system throughput of a single cell system is maximized if only one terminal transmits at a time, there has been a large interest in opportunistic communications and its relation to various fairness measures. On the other hand, in multicell systems there is a need to allocate transmission power such that some overall utility function is maximized typically under fairness constraints. Furthermore, in multicell systems the degree of resource allocation freedom includes the serving cell selection that allows for load balancing and thereby the efficient use of radio resources. In this paper we formulate the joint serving cell selection (link selection) and power allocation problem as an optimization task whose purpose is to maximize either the minimum user throughput or the multicell sum throughput. Both the max-min and the max-throughput problems are non-polynomial hard and we therefore propose heuristic solution approaches. We present numerical results that give new and valuable insights into the trade off between fair and sum throughput optimal joint resource allocation strategies. View full abstract»

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  • Autonomic Management of Heterogeneous Sensing Devices with ECA Rules

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (174 KB) |  | HTML iconHTML  

    Facing to the great number of wireless sensor/actuator devices, smart applications have an increasingly important requirement: autonomy. Besides autonomy in terms of energy, these devices have also to be functionally autonomous: they have to be self-discovered, self-(re-)configured and self-healed. This paper presents a self-manageable autonomic platform for heterogeneous sensing systems. Based on a service oriented architecture and an Event-Condition-Action model, management services collect information from managed elements (e.g., sensors, proxies, gateways) and perform management actions according to user defined ECA rules. We define a generic event model that allows us covering a large set of events. Events are captured and processed by rule evaluators which then perform corresponding management actions on the sensors. We show with experimental results that the mechanism brings little overhead in terms of energy consumption and execution time. View full abstract»

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  • Bandwidth-Efficient Media Access Protocol for Wireless Feedback Control in Home Energy Networks

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (292 KB) |  | HTML iconHTML  

    Home energy networks require the integration of networked sensing with networked control for energy monitoring and management. Shared communication media for sensing and control is easy to be configured but introduces the delay and packet loss. This paper studies the Media Access Control (MAC) layer support of reliable wireless feedback control and flexible sensing in home networks. We discuss the problem of large bandwidth requirement of reliable feedback control in the limited bandwidth of the shared network media. We propose a dynamic bandwidth assignment approach that fits the reliability requirement of feedback control and enables a high bandwidth utilization to solve the problem. The simulation results reveal that FCMA can achieve high bandwidth efficiency with low packet losses. View full abstract»

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  • Cascading Link Failure in the Power Grid: A Percolation-Based Analysis

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (442 KB) |  | HTML iconHTML  

    Large-scale power blackouts caused by cascading failure are inflicting enormous socioeconomic costs. We study the problem of cascading link failures in power networks modelled by random geometric graphs from a percolation-based viewpoint. To reflect the fact that links fail according to the amount of power flow going through them, we introduce a model where links fail according to a probability which depends on the number of neighboring links. We devise a mapping which maps links in a random geometric graph to nodes in a corresponding dual covering graph. This mapping enables us to obtain the first-known analytical conditions on the existence and non-existence of a large component of operational links after degree-dependent link failures. Finally, we present a simple but descriptive model for cascading link failure, and use the degree-dependent link failure results to obtain the first-known analytical conditions on the existence and non-existence of cascading link failures. View full abstract»

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  • CAT: A Last Mile Protocol for Content-Centric Networks

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (913 KB) |  | HTML iconHTML  

    In recent years, content-centric networking has become an active area of research. However, the proposals in this area often use custom protocols for the last mile communication between end users and content networks, which makes the technologies hard to be adopted. In this paper we present a content aware publish-subscribe protocol, called CAT, that can become a common solution for end users to access different content-centric networks. We discuss how CAT protocol can be implemented implemented with HTTP. We analyze the performance of a CAT proxy and discuss the potential performance improvements brought by parallel access and data caching. View full abstract»

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  • Cell Selection with Downlink Resource Partitioning in Heterogeneous Networks

    Publication Year: 2011 , Page(s): 1 - 6
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (311 KB) |  | HTML iconHTML  

    As the demand for wireless data grows to unprecedented levels, cellular service providers have been investigating different ways to meet this growing demand. The deployment of small cells with reduced transmission powers and reduced coverage areas is being considered as one possible way of meeting the growing demand. Using the same spectrum employed by existing macro cells, small cells would allow increased spatial reuse of bandwidth thus providing the potential for improved user rates. One challenge for small cells, though, is that due to their weaker signals (lower transmission powers, antennas with smaller antenna gains), the coverage area tends to be significantly reduced and the incremental benefit of deploying each small cell is limited. In this paper, resource partitioning is proposed along with suitably modified cell selection criteria to improve the performance of heterogeneous networks comprising small and macro cells that operate in the same swath of spectrum. Our simulation results demonstrate that with four small cells deployed per sector, 5%-ile and 50%-ile user throughputs both improve by ~150% relative to the same case without resource partitioning. View full abstract»

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  • Coalitional Game Theory for Cooperative Micro-Grid Distribution Networks

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (245 KB) |  | HTML iconHTML  

    Micro-grid distribution networks that use distributed energy sources are expected to lie at the heart of the emerging smart grid technology. While existing approaches have focused on control and communication aspects in micro-grids, this paper use coalitional game theory to study novel cooperative strategies between the micro-grids of a distribution network. For this purpose, a coalitional game is formulated between a number of micro-grids (e.g., solar panels, wind turbines, PHEVs, etc.) that are, each, servicing a group of consumers (or an area) and that are connected to a macro-grid substation. For forming coalitions, an algorithm is proposed to allow the micro-grids to autonomously cooperate and self-organize into a partition composed of disjoint micro-grid coalitions. Each formed coalition consists of micro-grids that have a surplus of power to transfer or sell and of micro-grids that need to buy or acquire additional power to meet their demand. Within every coalition, the micro-grids coordinate the power transfer among themselves as well as with the macro-grid station, in a way to optimize a utility function that captures the total losses over the distribution power lines. Also, the proposed algorithm allows the micro-grids, in a distributed manner, to self-adapt to environmental changes such as variations in the power needs of the micro-grids. Simulation results show that the proposed algorithm yields a reduction in terms of the average power losses (over the distribution line) per micro-grid, reaching up to 31% improvement relative to the non-cooperative case. View full abstract»

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  • Decentralized Control of a Material Flow System Enabled by an Embedded Computer Vision System

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (818 KB) |  | HTML iconHTML  

    In this study, a novel sensor/actuator network approach for scalable automated facility logistics systems is presented. The approach comprises (1) a new sensor combination (cameras and few RFID scanners) for distributed detection, localization and identification of parcels and bins and (2) a novel middleware approach based on a service oriented architecture tailored towards the utilization in sensor/actuator networks. The latter enables a more flexible deploying of automated facility logistics system, while the former presents a novel departure for the detection and tracking of bins and parcels in automated facility logistics systems: light barriers and bar code readers are substituted by low-cost cameras, local conveyor mounted embedded evaluation units and few RFID readers. By combining vision-based systems and RFID systems, this approach can compensate for the drawbacks of each respective system. By utilizing a state-of-the-art middleware for connecting all computer systems of an automated facility logistics system the costs for deployment and reconfiguring the system can be decreased. The paper describes image processing methods specific to the given problem to both track and read visual markers attached to parcels or bins, processing the data on an embedded system and communication/middleware aspects between different computer systems of an automated facility logistics system such as a database holding the loading and routing information of the conveyed objects as a service for the different visual sensor units. In addition, information from the RFID system is used to narrow the decision space for detection and identification. From an economic point of view this approach enables high density of identification while lowering hardware costs compared to state of the art applications and, due to decentralized control, minimizing the effort for (re-)configuration. These innovations will make automated material flow systems more cost-efficient. View full abstract»

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  • Demand Prediction Based on Social Context for Mobile Content Services

    Publication Year: 2011 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    The recent enhancement of mobile devices and wireless networks has enabled content services in mobile environments. Demand prediction is a traditional but powerful technique used for content services. However, it is hard to predict local demand in mobile environments because it depends not only on just user preference and the popularity of common content but also on other factors; users request content related to their locations; moreover, they are interested in the content uploaded by their friends who visited the location before them. Thus, we need to consider the context with multiple factors affecting the demand. In addition, we also need to consider the sequence of contexts.We call a sequence of contexts social context. This makes it difficult to predict local demand from users. In this paper, we propose a novel demand prediction engine that extracts local demand depending on social context and estimates what content will be requested there. To extract the demand, we use a log database and a pattern-matching technique in our prediction engine. To validate our prediction engine, we apply a prefetching service using the engine to a mobile content service. View full abstract»

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  • Deployment Aspects of LTE Pico Nodes

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (21)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (401 KB) |  | HTML iconHTML  

    There is a need to increase the capacity of cellular networks to support the successful growth of mobile broadband usage. Network densification with HetNet (Heterogeneous Networks) is identified as a key method to meet future demands. In this paper one promising HetNet component is studied, the low power pico node. The 3GPP LTE (Long Term Evolution) pico features are described and the deployment aspects are investigated by means of simulations. It is found that with good deployment the capacity increase from low power nodes can be significantly improved. Capturing hot spot traffic has larger impact on performance than radio access features like range extension. Thus, knowing the hot spot cluster positions and ability to deploy the pico node near these positions is important. Also the hotspot positions relative the overlaying macro cells have impact. View full abstract»

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  • Development of Home Energy Management System with Advice Function

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    First of all, this paper describes the present situation of the Japanese energy consumption trend and the necessity of home energy saving. Next, the feature of the present Home Energy Management System (HEMS) is described. Finally, this paper introduces our HEMS with advice function. The main feature of our HEMS is provision of suitable advice to user by analyzing his or her electric power consumption. View full abstract»

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  • Distributed Antenna Systems and Their Applications in 4G Wireless Systems

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (4)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (567 KB) |  | HTML iconHTML  

    Distributed antenna systems (DAS) are traditionally deployed for the coverage purpose, where multiple antennas connected with a common source are geographically separated within the cell. In order to provide high rate services in the 4G wireless system, DAS should be further enhanced with the help of advanced MIMO techniques. In this paper, we start with reviewing the typical scenarios for DAS, which are widely discussed in standardization. Then, the benefits of DAS with single antenna selection (SAS) are analyzed. Based on this, a DAS transmission mode compatible with 3GPP Long Time Evolution (LTE) Release 8 standard is proposed. According to the system level simulation, the cell average and cell edge throughput can be improved by 35.0% and 82.3% respectively, compared with LTE Release 8 system. Moreover, the total transmitted power can be reduced by 75%. View full abstract»

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  • Distributed Scheduling in Smart Grid Communications with Dynamic Power Demands and Intermittent Renewable Energy Resources

    Publication Year: 2011 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (151 KB) |  | HTML iconHTML  

    Concerns about climate change, rising fossil fuel prices and energy security have spurred interest in renewable energy generation and smart grid. Due to the dynamic power demands and intermittent renewable energy resources, optimal scheduling of power generation systems is important to minimize cost and green house gas emissions, and to avoid blackouts in smart grid. In this paper, we propose a distributed stochastic scheduling scheme in smart grid communications with dynamic power demands and intermittent renewable energy resources. Due to meteorological instability and complex system dynamics, hidden Markov models are used in modeling renewable energy resources. We formulate the stochastic scheduling problem as a partially observable Markov decision process multi-armed bandit problem. A value iteration algorithm is used to solve the above problem. Simulation results are presented to show the effectiveness of the proposed scheme. View full abstract»

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