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Communications Magazine, IEEE

Issue 6 • Date June 2014

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Displaying Results 1 - 25 of 36
  • IEEE Communications Magazine - Cover

    Page(s): c1
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  • Table of contents

    Page(s): 2 - 4
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    Freely Available from IEEE
  • Communications and standards: A natural pairing [The President's Page]

    Page(s): 6 - 10
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    Freely Available from IEEE
  • Conference calendar

    Page(s): 11
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  • Tribute to George Heilmeier, inventor of liquid crystal display, former DARPA director, and industry technology leader

    Page(s): 12 - 13
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  • Context-aware networking and communications: Part 1 [Guest Editorial]

    Page(s): 14 - 15
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    Freely Available from IEEE
  • Context-aware quality of service in wireless sensor networks

    Page(s): 16 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (244 KB) |  | HTML iconHTML  

    In wireless sensor networks, densely deployed and resource-constrained sensor nodes observe their surroundings and communicate the sensed data to the sink. However, those observations are correlated - spatially and temporally. Furthermore, the communicated data, depending on their priority, require differentiated QoS, such as end-to-end delay and jitter. In this work, we use context awareness as a means of sharing information required to control the network, and providing differentiated QoS to the nodes and their transmitted data by exploiting spatial and temporal correlation. Simulation results show that context awareness helps nodes to manage the network in an energy-efficient manner. View full abstract»

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  • A survey of context-aware middleware designs for human activity recognition

    Page(s): 24 - 31
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    The ever increasing technological advances in embedded systems engineering, together with the proliferation of small-size sensor designs and deployment, have enabled smart devices to recognize daily human-based actions, activities, and interactions. Therefore, inferring a vast variety of user-device-based activities from diverse contexts obtained by a series of sensory observations has drawn much interest to the research area of ubiquitous sensing. The existence and awareness of context provides the capability of being conscious of physical environments or situations around users, and this allows network services to respond proactively and intelligently based on such awareness. Hence, with the evolution of smartphones, software developers have been empowered to create context-aware applications for recognizing human-centric or community based innovative social and cognitive activities in any situation and at any location. However, the middleware services provided in mobile devices have limited resources in terms of power, memory, and bandwidth compared to the capabilities of PCs and servers. Also, power is a major restriction on implementation of context-aware applications. Mobile device batteries do not last a long time while operating sensor(s) constantly. To this end, this article extensively surveys the emerging concepts of context awareness in mobile platforms by providing up-to-date literature and future research directives. We also point out the challenges faced in this regard and enlighten them by offering possible solutions. View full abstract»

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  • CA-P2P: context-aware proximity-based peer-to-peer wireless communications

    Page(s): 32 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (269 KB) |  | HTML iconHTML  

    Many new wireless applications such as public safety and social networking have been emerging in recent years. Those applications introduce the necessity of direct communications among devices or peers without core network or wireless routers, which is not well supported in current network infrastructures. While some existing technologies can support certain levels of direct peer-to-peer communications, they are context-oblivious and inefficient. This article proposes a context-aware proximity-based P2P (CA-P2P) wireless communication system architecture to enable context awareness for direct P2P communications. The main idea is to systematically incorporate appropriate context information in direct communication protocols to improve overall performance. One of the major features is application-based communication, which connects peers according to their common applications. Accordingly, radio resources can be managed more efficiently among and within different application groups. Specifically, the scheme proposed in this article includes several new mechanisms such as context-aware peer discovery and context-aware peer association. Simulation results demonstrate that the proposed context awareness system achieves fast and efficient peer discovery and peer association in terms of latency and overhead. View full abstract»

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  • CACC: A context-aware congestion control approach in smartphone networks

    Page(s): 42 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (226 KB) |  | HTML iconHTML  

    One of the major challenging issues of smartphone networks is congestion control due to the limitation of node resources. In this article, we focus on exploring context knowledge between nodes to control congestion. For this purpose, we first measure the effect of context information on congestion, and specify several major congestion factors. We then model the congestion control problem as multiple criteria decision making, in which the weight of each congestion factor is measured by the CRITIC method. Subsequently, we develop a context-aware congestion control approach (CACC) to determine the forwarding set, including those messages that incur the least congestion on the network. Extensive real-trace driven simulation is conducted, and the experimental results finally validate the efficiency of our proposed CACC. View full abstract»

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  • Experimenting with floating content in an office setting

    Page(s): 49 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (582 KB) |  | HTML iconHTML  

    The growing ubiquity and pervasiveness of sensors and smart devices, with the consequent availability of a large amount of "local" and contextualized information, are giving rise to a wealth of "context-aware" applications and services. In this work we consider an opportunistic communication scheme called Floating Content (FC), which was specifically designed for serverless distributed context-aware applications. So far, the performance analysis of FC, and in particular of content lifetime and availability, was based on simplified system models and fluid system analysis. The resulting performance estimates did not account for the effects of propagation characteristics, mobility patterns, and communication protocols, all factors known to significantly affect the performance of opportunistic communication schemes. This article studies the main issues related to the performance of FC service in a realistic office setting through a first experimental evaluation of a mobile app for Android devices. Our experimental results confirm the feasibility of FC service for supporting practical context-aware mobile applications in office settings. View full abstract»

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  • Prospects and challenges of context-aware multimedia content delivery in cooperative satellite and terrestrial networks

    Page(s): 55 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB) |  | HTML iconHTML  

    Cooperative satellite cells and terrestrial wireless communication networks (comprising macrocells, picocells, and the Internet) are much anticipated access technologies to enable users to seamlessly access rich multimedia content (e.g., TV broadcasting, VoD streaming, and other services) on their devices. Furthermore, context awareness has become popular to accompany these services not only to enhance the users' perceived service quality but also to improve the overall utilization of such cooperative networks. However, delivering context-aware multimedia content through these cooperative networks is associated with a significant research challenge due to the inherently different satellites and terrestrial networks technologies. For example, to provide context-specific TV programs to a user, a satellite needs to adopt unicast-style delivery. This may be an expensive operation since satellites are intrinsically useful for broadcasting or multicasting services to a wide audience. In contrast, terrestrial communication networks can be better suited to perform unicast-based context-aware content delivery. In this article, we address these challenges, and propose a dynamic bandwidth allocation method to effectively utilize the satellite and terrestrial networks for providing context-aware contents to many users. Computer-based simulation results are presented to demonstrate the effectiveness of our proposed method. View full abstract»

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  • A context-aware system architecture for leak point detection in the large-scale petrochemical industry

    Page(s): 62 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB) |  | HTML iconHTML  

    In the large-scale petrochemical industry, one of the most concerning problems is the leakage of toxic gas. To solve this problem, it is necessary to locate the leak points and feed the possible location of leak points back to rescuers. Although some researchers have previously presented several methods to locate leak points, they ignored the impact of external factors, such as wind, and internal factors, such as the internal pressure of equipment, on the accurate detection of leak points. Fundamentally, both of those factors belong to context-aware data in a context-aware system. Therefore, this article proposes a context-aware system architecture for leak point detection in the large-scale petrochemical industry. In this three-layer architecture, a distributed database based on data categorization is designed in the storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then a real-time template matching algorithm for context-aware systems is presented in the computing layer to process the context-aware data stream. The architecture is a new scheme for accurate leak point detection, which is more consistent with practical application in the large scale petrochemical industry. View full abstract»

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  • On systems generating context triggers through energy harvesting

    Page(s): 70 - 77
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB) |  | HTML iconHTML  

    Context awareness is one of the building blocks of smart applications that constitutes smart spaces. With the emergence of cyber physical systems, it is now possible to create spaces that are truly adaptable and smart. In these spaces, contextual parameters are captured by many wireless sensor nodes. This collected data is processed to understand the context in real time. Since a large number of sensors are deployed, processing all the data is a big task. Moreover, since the sensors are powered by batteries, they have a limited lifetime. Sensing only when there is a context event can save energy as well as reduce data processing. To make sensor nodes operate perpetually, ambient energy harvesters can be used. Typically, the energy harvesting source of a sensor is related to the physical parameters the sensor is measuring. We propose exploiting this property to develop a context-event triggering mechanism in this article. We also adapt the context-aware application framework for incorporating context-event triggers by harvesters. A Smart-M3-based architecture is also proposed. Through a real-world use case, we illustrate significant energy savings and reduced data processing in our proposed approach. View full abstract»

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  • Multidimensional context-aware social network architecture for mobile crowdsensing

    Page(s): 78 - 87
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    This article proposes a multidimensional context-aware social network architecture, which aims to provide a mobile ecosystem to enable context awareness in the development and utilization of mobile crowdsensing applications. This mobile ecosystem is constructed to provide context awareness capabilities for different roles (i.e., users or developers) in the system and facilitate interactions between them. This system can ease the development of context-aware mobile applications, and enable context-aware mobile crowdsensing considering environmental, personal, and social information. We present a flow of context-aware solutions designed on this system, and highlight the orchestrations and advantages of different context-aware schemes in the system for different types of users (requesters and participants) in mobile crowdsensing. We demonstrate the feasibility of the proposed mobile ecosystem by presenting a novel context-aware mobile crowdsensing application called Smart City, and evaluate the system performance based on this application. View full abstract»

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  • Smart-device-to-smart-device communications: Part 2 [Guest Editorial]

    Page(s): 88 - 89
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  • Enable device-to-device communications underlaying cellular networks: challenges and research aspects

    Page(s): 90 - 96
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (221 KB) |  | HTML iconHTML  

    Device-to-device communication underlaying a cellular network is a promising technology in future wireless networks to improve network capacity and user experience. While D2D communication has great potential to improve wireless system spectral and energy efficiency due to the proximity of communication parties and higher spectrum reuse gain, tremendous work is still ongoing to turn the promising technology into a reality. This article discusses D2D technical challenges as well as standards progress and important research aspects that enable D2D communications underlaying cellular networks. The key research areas addressed include interference management, multihop D2D communications, and D2D communications in heterogeneous networks. When enabling D2D communications underlaying cellular networks, D2D communications can use either cellular downlink or cellular uplink resources. The two resource sharing modes will create different interference scenarios. The performance evaluation on D2D communications underlaying cellular networks under these two different scenarios is provided. View full abstract»

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  • Proximity discovery for device-to-device communications over a cellular network

    Page(s): 98 - 107
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    This article first reviews the proximity discovery techniques used in most device-to-device communication systems. The associated issues when applied to a cellular network and the potential solutions are then addressed. We propose a unified discovery design for full, partial, and off-network coverage scenarios. We discuss the advantages and disadvantages of packet and signature-based discovery schemes. We present a signature-based discovery design as a conceptual example for cellular applications. Through this example, we demonstrate that a cellular network can benefit from the information provided by the device discovery that a traditional cellular system lacks so that resources, interference, and connection selection can be more efficiently managed under a unified cellular network centric architecture. View full abstract»

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  • Resource control in network assisted device-to-device communications: solutions and challenges

    Page(s): 108 - 117
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    Network assisted Device-to-Device (D2D) communications is envisioned as a promising technology to facilitate the discovery of geographically close cellular devices and reduce the communication cost between these devices. In order to fully take advantages of the freedom in resource management introduced by D2D communications, it is essential to design optimal resource control policies. In this article, we first review and classify the state-of-the-art research based on different considered network scenarios. We then introduce our preliminary studies on delay-aware resource control with bursty traffic, in which we propose an optimization framework and formulate a general queuing model for performance evaluation and optimization. Finally, the challenges and open issues are highlighted to serve as guidelines for future research. View full abstract»

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  • Cooperative interference cancellation using device-to-device communications

    Page(s): 118 - 124
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB) |  | HTML iconHTML  

    The ongoing densification in cellular networks has turned interference into a serious problem in future cellular networks. Since the interference experienced by close-by users in a cellular network is usually correlated, it can be cooperatively suppressed to improve user experience. In this article, we introduce the idea of cooperative interference cancellation (CIC) between close-by users using device-to-device (D2D) communications for the example of the upcoming 3rd Generation Partnership Program (3GPP) Long Term Evolution (LTE) Rel-12 D2D technology. We understand CIC as a new network interference management tool, capable of exploiting interference correlation to improve downlink throughput. We discuss possible deployment scenarios as well as theoretical and practical challenges. To each challenge we provide some possible solutions. Finally, a first feasibility analysis using numerical simulations is presented that demonstrates the potential gains of CIC. View full abstract»

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  • Game theoretic D2D content dissemination in 4G cellular networks

    Page(s): 125 - 132
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    The widespread proliferation of mobile devices has motivated Device-to-Device (D2D) communications as a means of cell offloading toward better Quality of Service (QoS) and higher energy efficiency. Although Wi-Fi networks have the lion's share regarding the D2D communications in the unlicensed spectrum, it is uncertain whether they constitute the best option as technology evolves. In particular, the increasing transmission data rates, the novel interference cancelation techniques, as well as the potential of centralized network support, stress the need for new Medium Access Control (MAC) protocols, especially in content dissemination scenarios where all nodes share the same goal. In this article we study the suitability of Wi-Fi technology in content dissemination scenarios with multiple available source nodes, and we propose two energy-aware game theoretic MAC strategies (a distributed and a network-assisted) as possible alternatives. Our simulation results show the effectiveness and the flexibility of our proposed solutions, highlighting the necessity for new MAC designs. View full abstract»

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  • Delay-aware cross-layer design for device-to-device communications in future cellular systems

    Page(s): 133 - 139
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    Device-to-device (D2D) communications allow direct communications between nodes without transmitting data via the base stations in cellular systems, which could bring significant performance improvement. Since most applications are delay-sensitive, it is very important to consider delay performance in addition to physical layer throughput for D2D communications. To improve delay performance it is necessary to dynamically control the radio resource in a cross-layer way according to both the channel fading information and the queue length information. The former allows an observation of good transmission opportunity and the latter provides the urgency of data flows. However, the resource control with delay constraints involves stochastic optimization, which is very challenging. In this article we first summarize various approaches to solve the delay-aware resource allocation problems for D2D communications. We propose a low complexity practical solution by exploiting the interference filtering property of CSMA-like MAC protocols in the D2D system. Based on the solution structure, we further discuss the implementation issues based on LTE-Advanced systems and evaluate the associated performance and complexity. Finally we discuss the choice of MAC parameters for the overall D2D system performance. View full abstract»

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  • Expanding cellular coverage via cell-edge deployment in heterogeneous networks: spectral efficiency and backhaul power consumption perspectives

    Page(s): 140 - 149
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (267 KB) |  | HTML iconHTML  

    Heterogeneous small-cell networks (HetNets) are considered to be a standard part of future mobile networks where operator/consumer deployed small-cells, such as femto-cells, relays, and distributed antennas (DAs), complement the existing macrocell infrastructure. This article proposes the need-oriented deployment of small-cells and device-to-device (D2D) communication around the edge of the macrocell such that the small-cell base stations (SBSs) and D2D communication serve the cell-edge mobile users, thereby expanding the network coverage and capacity. In this context, we present competitive network configurations, namely, femto-on-edge, DA-one-dge, relay-on-edge, and D2D-communication on- edge, where femto base stations, DA elements, relay base stations, and D2D communication, respectively, are deployed around the edge of the macrocell. The proposed deployments ensure performance gains in the network in terms of spectral efficiency and power consumption by facilitating the cell-edge mobile users with small-cells and D2D communication. In order to calibrate the impact of power consumption on system performance and network topology, this article discusses the detailed breakdown of the end-to-end power consumption, which includes backhaul, access, and aggregation network power consumptions. Several comparative simulation results quantify the improvements in spectral efficiency and power consumption of the D2D-communication-on-edge configuration to establish a greener network over the other competitive configurations. View full abstract»

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  • Social-aware D2D communications: qualitative insights and quantitative analysis

    Page(s): 150 - 158
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (407 KB) |  | HTML iconHTML  

    With emerging demands for local area services, device-to-device communication is conceived as a vital component for the next-generation cellular networks to improve spectral reuse, bring hop gains, and enhance system capacity. Ripening these benefits depends on efficiently solving several main technical problems, including mode selection, resource allocation, and interference management. Aiming to establish a new paradigm for solving these challenging problems in D2D communication, in this article we propose a social-aware enhanced D2D communication architecture that exploits social networking characteristics for system design. By developing a profound understanding of the interplay between social networks' properties and mobile communication problems, we qualitatively analyze how D2D communications can benefit from social features, and quantitatively assess the achievable gains in a social-aware D2D communication system. View full abstract»

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  • Automotive networking and applications [Guest Editorial]

    Page(s): 160 - 162
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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Sean Moore
Centripetal Networks