IEEE Communications Surveys & Tutorials ... Communications Surveys and Tutorials. Paper in ... distributed network services and applications have emerged.
IEEE COMMUNICATIONS SURVEYS & TUTORIALS, VOL. 12, NO. 4, FOURTH QUARTER 2010
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ELCOME to the fourth issue of 2010 of the IEEE Communications Surveys and Tutorials. Paper in this issue survey the research effort in several areas such as green networking, scheduling and admission control in 802.16 networks, network coordinates systems, Wireless sensor networks software defined radio and Interference in Wireless Ad Hoc Networks. Since the energy crisis and environmental protection are gaining increasing concerns in recent years, new research topics to devise technological solutions for energy conservation are being investigated in many scientific disciplines. Specifically, due to the rapid growth of energy consumption in Information and Communication Technologies (ICT), lot of attention is being devoted towards “green” ICT solutions. In “Energy Efficiency in Telecom Optical Networks”, Yi Zhang, Pulak Chowdhury, Massimo Tornatore, and Biswanath Mukherjee provide a comprehensive survey of the most relevant research activities for minimizing energy consumption in telecom networks, with a specific emphasis on those employing optical technologies. They investigate the energyminimization opportunities enabled by optical technologies and classify the existing approaches over different network domains, namely core, metro, and access networks. A section is also devoted to describe energy-efficient solutio ns for some of todayâs important applications using optical network technology, e.g., grid computing and data centers. Moreover, the authors provide an overview of the ongoing standardization efforts in this area. The IEEE 802.16 standard supports heterogeneous classes of traffic with different QoS requirements and defines several signaling mechanisms to request and allocate resources. Also it offers the possibility of adapting the modulation and coding schemes based on channel conditions and proposes a set of techniques such as packing and fragmentation to allow efficient use of the available bandwidth. The standard, however, leaves open the resource management and scheduling algorithms. In “Scheduling and CAC in IEEE 802.16 Fixed BWNs: A Comprehensive Survey and Taxonomy”, Ikbal Chammakhi Msadaa, Daniel Câmara, and Fethi Filali provide an understanding of different technical issues that researchers have been facing to ensure QoS support in IEEE 802.16 fixed broadband wireless networks. Moreover, they provide insight into the new research interests. During the last decade, a new class of large scale globallydistributed network services and applications have emerged. Those systems are flexible in the sense that they can select their communication path among a set of available ones. However, ceaselessly gathering network information such as latency to select a path is infeasible due to the large amount of Digital Object Identifier 10.1109/SURV.2010.110210.00000
measurement traffic it would generate. To overcome this issue, Network Coordinates Systems (NCS) have been proposed. An NCS allows hosts to predict latencies without performing direct measurements and, consequently, reduce the network resources consumption. During these last years, NCS opened new research fields in which the networking community has produced an impressive amount of work. In “A Survey on Network Coordinates Systems, Design, and Security”, Benoit Donnet, Bamba Gueye, and Mohamed Ali Kaafar survey the various NCS proposed as well as their intrinsic limits. In particular, they focus on security issues and on how to use NCS for predicting bandwidth. The Dedicated Short-Range Communications (DSRC) standards suite is based on multiple cooperating standards mainly developed by the IEEE. In “Notes on DSRC & WAVE Standards Suite: Its Architecture, Design, and Characteristics”, Y. L. Morgan focus on the core design aspects of DSRC which is called Wireless Access in Vehicular Networks (WAVE). WAVE is highlighted in IEEE 1609.1/.2/.3/.4. The DSRC and WAVE standards have been the center of major attention in both research and industrial communities lately . This attention reflects the potential of WAVE to facilitate much of the vehicular safety applications. Fundamental mechanisms used in WAVE standards in response to the vehicular communication environments as defined in both DSRC and IntelliDriveSM towards, primarily, enhancing road safety are discussed in the paper. The author also discusses relevant to MAC services, QoS and service management and describedthe use of channel coordination, WAVE communication types and WBSS policies in plain language. Wireless sensor networks (WSNs) allow a variety of applications, including military surveillance, habitat monitoring, and infrastructure protection, etc. Operating system (OS) support for WSNs plays a central role in building scalable distributed applications that are efficient and reliable. Over the years, there has been a variety of OSes development to facilitate developing WSN applications. Aside from the basic system implementations, there is also a large body of work devoted to improving OS capabilities in different dimensions. In “Providing OS Support for Wireless Sensor," Wei Dong, Chun Chen, Xue Liu, and Jiajun Bu provide a comprehensive review of existing work in sensornet OS design. The authors examine the challenges in the OS design space and introduce the major components of a sensornet OS. They also provide an overview of existing work, present a taxonomy of stateof-the-art OSes, and discuss various approaches to address the design challenges. Moreover, recom mendations from the perspectives of OS developers and OS users are pointed out and several open problems identified. Software Defined Radio (SDR) may provide flexible, upgradeable and longer lifetime radio equipment for the mili-
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IEEE COMMUNICATIONS SURVEYS & TUTORIALS, VOL. 12, NO. 4, FOURTH QUARTER 2010
tary and for civilian wireless communications infrastructure. SDR may also provide more flexible and possibly cheaper multistandard- terminals for end users. It is also important as a convenient base technology for the future context-sensitive, adaptive and learning radio units referred to as cognitive radios. Furthermore, SDR poses many challenges, some of them causing SDR to evolve slower than otherwise anticipated. Transceiver development challenges include size, weight and power issues such as the required computing capacity, but also SW architectural challenges such as waveform application portability. In “Software Defined Radio: Challenges and Opportunities”, Tore Ulversøy furnishes a comprehensive view of Software Radio including regulatory issues. The intrinsic characteristics of ad hoc networks require interference models capable of capturing these characteristics, making these models appropriate for designing, analyzing and deploying such networks. As a consequence, a myriad of interference models for ad hoc networks can be found in the literature, that describe the effects of interference at different layers and with different levels of detail. Some of these models describe interference as a random process whose statistics depend mainly on physical layer parameters, and are better suited for the analysis of issues related to the physical layer. Other models focus on the effects of interference at higher layers, and are more appropriate when the analysis of network-related issues is of interest. In“Modeling Interference in Wireless Ad Hoc Networks”, Paulo Cardieri presents a comprehensive survey of interference models for wireless ad hoc networks, emphasizing their domains of application, illustrated with examples. The interference models are presented in this
survey from the perspective of the radio capture phenomenon, resulting in a unified view of interference models, which may be helpful when selecting the appropriate model for a given purpose. I hope that you found the articles of this issue informative and useful. Please bear in mind that we have an open call for submissions of surveys and tutorials on any communications or networking related topic. I hope that you will consider developing and submitting an article. In addition, we would appreciate if you could please encourage others to develop an article whenever you believe sharing their expertise would be valuable to our community. Please refer to the Author Guidelines at http://www.comsoc.org/pubs/surveys for detailed submission instructions and submit your paper at
Nelson L. S. da Fonseca, Editor-in-Chief IEEE Communications Surveys & Tutorials http://mc.manuscriptcentral.com/comst-ieee.
