Design and implementations series VII: Building next-gen applications enabled by broadband wireless

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<ul><li><p>IEEE Communications Magazine August 201126</p><p>elcome to the seventh installment of the Designand Implementation (D&amp;I) Series. The goal of</p><p>the D&amp;I Series is to facilitate knowledge transfer betweenindustry-oriented engineers and scientists. To differentiatefrom other peer-reviewed, academically rigorous articleson communications technologies, the focus of D&amp;I articlesis primarily on the Lessons Learned information gainedwhile designing, implementing, and deploying new commu-nications products, services, and solutions.</p><p>Lessons Learned information includes: mistakes, trade-offs, redesigns, re-engineering, bugs, protocol inadequa-cies, inefficiencies, interoperability issues, and othernegative results. Traditionally, such results are consid-ered non-publishable by academia, and trade secrets orcompetitive intelligence by industry but in fact theseresults may be quite valuable: The Communications Soci-etys industry members can use them to potentially reducetime and cost for their projects while improving quality;academic researchers can use them as motivation forfuture research or standardization work. In the spirit ofthe open source software movement, the D&amp;I Series pro-motes the open sharing of D&amp;I experiential knowledge.</p><p>This installments three topic areas span the major com-ponents of telecommunications systems: endpoints, signal-ing and switching systems, and interconnecting networks,all in the context of mobile networking and broadbandwireless.</p><p>The Network: Internet access is undergoing a funda-mental change. Advances in broadband wireless communi-cation have produced more efficient, higher-speed,lower-cost radio technologies and architectures (WiFi,Mobile WiMax/IEEE 802.16, LTE, etc.). These are surelyfacilitating a migration to the mobile Internet, whichenables a variety of mobile devices to access a diverserange of services and applications anytime and anywhere.The mobile Internet has the potential to significantlyreduce the cost of applications such as live news broad-casts (LNB) from the field, which are the mainstay of tele-</p><p>vision news providers. Today, however, bandwidth-inten-sive LNB nodes in the field, which supply a video feed toremote news centers, would compete for single-radio net-work resources with many other mobile terminals that alsoaccess bandwidth-intensive applications. Congestionensues, and subsequent reduction in quality perceived bythe user hinders the uptake of LNB over the mobile Inter-net.</p><p>C. H. Wang, H. S Liu, and W. Liao from Ming ChuanUniversity and National Taiwan University offer a solutionto LNB over the mobile Internet in their article, i-SNG:A Cost-Effective Live News Broadcasting System overHeterogeneous Wireless Networks. They show how theStream Control Transmission Protocol (SCTP), with itsmultilink Concurrent Multipath Transfer (CMT) exten-sion, may be used to aggregate multiple heterogeneouswireless links in order to provide sufficient bandwidth tosupport a high-fidelity LNB video feed node in the field.By using VPN technology, the mobile LNB node may beattached to the same private IP network as the remotenews center.</p><p>The Endpoint: Multimedia conferencing systems, aswell as more advanced telepresence systems, are becomingmore popular every day in the enterprise. The term telep-resence is used to describe systems that provide high-defi-nition, high-quality audio/video, enabling a being thereexperience.</p><p>Increases in the bandwidth of broadband wireless band-width and in the capabilities of smartphone devices arecreating user expectations to access advanced conferencingsystems from their smartphones rather than from fixedequipment installed in some conferencing room at theoffice.</p><p>In Meetecho Mobile: Accessing an IETF-CompliantConferencing Framework from Mobile Devices, SimonPietro Romano et al. from Meetecho and the Universita diNapoli Federico II discuss several reasons why enablingmobile client users to participate in multimedia conferences</p><p>SERIES EDITORIAL</p><p>W</p><p>DESIGN AND IMPLEMENTATIONS SERIES VII: BUILDING NEXT-GENAPPLICATIONS ENABLED BY BROADBAND WIRELESS</p><p>Salvatore Loreto Sean Moore</p><p>LYT-GUEST EDIT-Moore 7/21/11 1:16 PM Page 26</p></li><li><p>IEEE Communications Magazine August 2011 27</p><p>is a challenge. Dealing with audio and video encoding/decod-ing may be the trickiest part, requiring judicious choices inthe methods both for handling audio samples, so as to pro-vide for good perceived quality, and for capturing video fromthe video camera embedded in the smartphone.</p><p>The Internet Engineering Task Force (IETF) is heavilyinvolved in standardizing protocols for the negotiation,instantiation, and manipulations of conferences, as well asin providing support for functions like real-time streamingand mixing. Conformance to IETF standard protocols,besides enabling interoperability, can definitely ease thedevelopment phase, as a number of existing libraries canbe exploited.</p><p>The Switch: Service enablers expose telecom networkfunctionalities and assets to external service providers orthird-party application developers, making it possible fortelecom operators to create extra value from their uniqueassets and specific network function. Enablers can be usedas building blocks to build innovative services, and are typ-ically defined as standards by institutions like the OpenMobile Alliance (OMA) and adopted by the Third Gener-ation Partnership Project (3GPP) as IP Multimedia Sub-system (IMS) standards. Common examples of serviceenablers include presence, location, push-to-talk, SMS, andbilling capabilities.</p><p>Other than the service enablers standardized by OMA,several others have been designed and made available bythe different telecom operators or telecom suppliers toexpose other functionalities that have been demonstratedto be profitable building blocks useful to facilitate applica-tions development. The flourishing growth of new serviceenablers make it interesting to create a process that makesit possible to identify network functions which could beused in a wide enough variety of scenarios to merit thecreation of new service enablers.</p><p>In Design and Implementation of IMS Applications:An Enabler-Oriented Approach, Alberto Hernandez et al.from Universidad Politecnica de Madrid and EricssonEspana discuss their experience with creating new serviceenablers for IMS networks and combining them to createnew multimedia applications. They identify both theadvantages and challenges of developing with serviceenablers, and provide much insight on how similar projectsshould be approached.</p><p>We hope you both enjoy and learn from this installmentof D&amp;I as much as we did in serving as its editors. If thesearticles and past installments of D&amp;I have inspired you toconsider contributing your valuable D&amp;I knowledge to theCommunications Society members, or to serve as a review-er for D&amp;I submissions, contact us directly so that togeth-er we can create a first-rate publication for the benefit ofour industry members.</p><p>Please join us in acknowledging the many anonymousreviewers who ensured the quality of the articles.</p><p>BIOGRAPHIESSALVATORE LORETO [M01, SM09] ( has 15 years ofexperience in a variety of information and communication industries, andhas been working in networking and telecommunications since 1999. Cur-rently, he works as a research scientist in the Software and Service sectionbranch, which is part of the NomadicLab at Ericsson Research Finland. Hehas made contributions in Internet transport protocols (e.g., TCP, SCTP),signal protocols (e.g., SIP, XMPP), VoIP, IP-telephony convergence, confer-encing over IP, 3GPP IMS, HTTP, and web technologies. He is also an activecontributor to the IETF, where he has coauthored several RFCs and Internetdrafts. Currently he is serving within the IETF as co-chair of the SIP Over-load Control (soc) and Bidirectional or Server-Initiated HTTP (HyBi) workinggroups. For the IEEE Communications Society, he serves as a Design andImplementation Series co-editor and an Associate Technical Editor for IEEECommunications Magazine. He received an M.S. degree in engineer com-puter science and a Ph.D. degree in computer networking from Napoli Uni-versity in 1999 and 2006, respectively.</p><p>SEAN MOORE [M01, SM03] ( has over 25 years ofexperience in a variety of technology industries and has been working innetworking and telecommunications since 2001. Currently, he is chief tech-nology officer and vice president of research for Centripetal Networks, Inc.,a vendor of network security products and services. In the past, he waschief architect and chief scientist at Avaya, a vendor of enterprise commu-nications solutions; chief scientist at Cetacean Networks, a vendor ofadvanced routers and routing applications; senior director of R&amp;D, a developer of supply-chain management e-commercesolutions; and director of Advanced Systems and director of Business Devel-opment at BBN Corporation, an R&amp;D services provider to the U.S. Depart-ment of Defense. He has made contributions in network security,peer-to-peer media distribution protocols, network admission control, web-telephony convergence, network tomography, digital signal processing, fastFourier transform algorithms, medical imaging, global climate modeling,global-scale distributed databases, global-scale logistics and scheduling sys-tems, e-commerce, genetic algorithms, automated hardware design, queu-ing theory, TCP technology, and scheduling theory. His software for fastFourier transforms on the 2-sphere is open sourced as SpharmonicKit. Forthe IEEE Communications Society, he serves as a co-editor of the Designand Implementation Series and Associate Editor-in-Chief for IEEE Communi-cations Magazine. He received a B.S. degree in electrical engineering fromTulane University in 1983, an M.S. in mathematics from the University ofNew Orleans in 1990 (SIAM Applied Mathematics Award co recipient), andM.S. and Ph.D. degrees in computer science from Dartmouth College in1993 and 1994.</p><p>SERIES EDITORIAL</p><p>LYT-GUEST EDIT-Moore 7/21/11 1:16 PM Page 27</p><p> /ColorImageDict &gt; /JPEG2000ColorACSImageDict &gt; /JPEG2000ColorImageDict &gt; /AntiAliasGrayImages false /CropGrayImages true /GrayImageMinResolution 300 /GrayImageMinResolutionPolicy /OK /DownsampleGrayImages false /GrayImageDownsampleType /Average /GrayImageResolution 300 /GrayImageDepth -1 /GrayImageMinDownsampleDepth 2 /GrayImageDownsampleThreshold 1.50000 /EncodeGrayImages true /GrayImageFilter /DCTEncode /AutoFilterGrayImages true /GrayImageAutoFilterStrategy /JPEG /GrayACSImageDict &gt; /GrayImageDict &gt; /JPEG2000GrayACSImageDict &gt; /JPEG2000GrayImageDict &gt; /AntiAliasMonoImages false /CropMonoImages true /MonoImageMinResolution 1200 /MonoImageMinResolutionPolicy /OK /DownsampleMonoImages false /MonoImageDownsampleType /Average /MonoImageResolution 1200 /MonoImageDepth -1 /MonoImageDownsampleThreshold 1.50000 /EncodeMonoImages true /MonoImageFilter /CCITTFaxEncode /MonoImageDict &gt; /AllowPSXObjects false /CheckCompliance [ /None ] /PDFX1aCheck false /PDFX3Check false /PDFXCompliantPDFOnly false /PDFXNoTrimBoxError true /PDFXTrimBoxToMediaBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXSetBleedBoxToMediaBox true /PDFXBleedBoxToTrimBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXOutputIntentProfile (None) /PDFXOutputConditionIdentifier () /PDFXOutputCondition () /PDFXRegistryName () /PDFXTrapped /False</p><p> /CreateJDFFile false /Description &gt; /Namespace [ (Adobe) (Common) (1.0) ] /OtherNamespaces [ &gt; /FormElements false /GenerateStructure false /IncludeBookmarks false /IncludeHyperlinks false /IncludeInteractive false /IncludeLayers false /IncludeProfiles false /MultimediaHandling /UseObjectSettings /Namespace [ (Adobe) (CreativeSuite) (2.0) ] /PDFXOutputIntentProfileSelector /DocumentCMYK /PreserveEditing true /UntaggedCMYKHandling /LeaveUntagged /UntaggedRGBHandling /UseDocumentProfile /UseDocumentBleed false &gt;&gt; ]&gt;&gt; setdistillerparams&gt; setpagedevice</p></li></ul>


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