文件名称：Personal Networks_ Wireless Networking for Personal Devices.pdf
文件大小：2.09MB
文件格式：PDF
更新时间：2022-09-03 05:03:45
Networks Wireless Networking Personal Devices
Preface RecentdecadeshaveshownatremendousexpansionoftheInternet.Thenumberof connectedterminalshasincreasedbyordersofmagnitude,traffichasgrownexponen- tially,coveragehasbecomeubiquitousandworldwide,andtoday’ssophisticatedWeb 2.0applicationsareincreasinglyprovidingserviceswhichhithertohavebeentherealm oftelecommunications,suchasSkypeandvideoconferencing.Thishasevenledtothe thoughtthataccesstotheInternetmightonedaybeauniversalrightofeverycitizen. Thisevolutionwillaccelerateinthecomingdecades.ThedrivingfactorismobileInter- net,aresultofthecontinuingvalidityofMoore’slaw,accordingtowhichthedensityof microelectroniccircuitrydoubleseveryyearandahalf.Theimplicationisthatcomputing powerand,initswake,communicationpowerwillcontinuetoincreaseexponentially.Its corollaryisafallinthecostofprovidingacertainamountofcomputingandcommu- nicationpowertotheextentthatitisbecomingperfectlyfeasibletoequipeveryartifact withcomputingandcommunicationcapabilities.Thisiswhatenables‘theInternetof things’–itisexpectedthattherewillbeoftheorderof1000devicesperpersoninthe year2017(Tafazolli2004).Therangeofdevicetypesandtheircapabilitieswillbemind- boggling.Mostofthesedeviceswillbemobileoratleastwirelesslyconnected.Ahuge challengewillbetoexploitthisseaofdevicesandtheirconnectednesstocreatenoveland usefulapplicationswithoutdrowninginthecomplexityofmanaginglargeheterogeneous distributedsystems. Thevisionofpersonalnetworkswasbasedonthesetrends,whichwereforeseeable givenMoore’slawandthederivedtechnologyroadmaps.Itwastheresultofbrainstorming sessionstakingplacein2000atEricssonResearchandDelftUniversityofTechnology intheNetherlands.Thedreamwastocreateanenvironmentinwhicheverypersonhas athisfingertipsallthedigitaldevicesheownsregardlessofwhereheorsheisand wherethosedevicesare,aslongastheyareconnected.Weenvisagedapersontobe alwayssurroundedbya‘virtualdigitalbubble’formedbyhisorherpersonaldevices. Thispersonalnetworkwouldenhanceaperson’sprivateandprofessionalcapabilitiesin termsofaccesstoinformation,controlofhisenvironment,socialinteraction,etc.Itwould dynamicallychangeasthepersonmovedaroundandengagedindifferentactivities.It wouldhaveaglobalreachandwouldalwaysincorporatethosedevicesthataremost suitabletosupporttheperson. Aswebeganexploringtheidea,wecameupontheMopedprojectofRobinKravetz attheUniversityofIllinois,whichhadasimilarvision.Thistogetherwithotherideas triggeredtheconceptofapersonalnetwork,thesubjectofthisbook.Theideaswere elaboratedintwolargeEuropeanresearchprojects,MAGNETandMAGNETBeyond, andtwoDutchprojects,PNP2008andQoSforPN@Home.Theselednotonlytothe xiv Preface developmentandprototypesoftechnicalsolutionsforthebasicfunctionalitiesrequiredin personalnetworks,butalsotofirstexperimentswithapplicationsandthestudyofpotential businessmodels.Theconcretesolutionsthatarepresentedinthisbookweredevelopedin thoseprojects.Inparallel,similarideashadbeendevelopedintheUKinthecontextofthe MobileVirtualCentreofExcellencebyJamesIrvineandJohnDunlopattheUniversity ofStrathclyde.Theirconceptwasnamedthe‘personaldistributedenvironment’. Theideasaboutpersonalnetworkswereverymuchcenteredonthepersonandhow hercapabilitiescouldbeenhancedbycreatingasynergeticenvironmentconsistingofthe hundredsofpersonaldigitaldevicesshemightowninthenearfuture.Anaturalnextstep wastoexplorehowsimilarsynergiescouldbeachievedbypoolingpersonalresources tosupportandenhancetheactivitiesofagroupofpeople.Thisledtotheconceptof federationsofpersonalnetworksbelongingtodifferentpeople.Theseideaswerealso exploredintheMAGNETBeyondandPNP2008projects. Thebasicfoundationshavebeenlaidtobuildpersonalnetworksandtheirfederations, andprototypesanddemonstratorshavebeenbuilt.Moreresearchisneededinparticular tocreateenvironmentsthatallowrapiddevelopmentofpersonalnetworkapplications, andtofacilitatedifferentbusinessrolesandmodelstomaketheconceptscommercially viable.Thiswillalsorequireeffortsinstandardization,whichhavealreadystarted. Themarketpulltobuildandusepersonalnetworksandtheirfederationsisnotthere yet.However,webelievethatweareonthebrinkofabreakthroughinthisrespect.If theWWRFpredictionsof1000devicesperpersonin2017andthe100billionmobile InternetdevicesinthenextdecadeforeseenbyCisco(CiscoSystems2009)becomea reality,conceptssuchaspersonalnetworkswillbegoodtoolsnotonlytomanagethe resultingcomplexity,but,evenmoreimportantly,tocreatehithertounknownopportunities toempowerpeopleintheirprivatelivesandatwork. Thisbookcoversthecoreconceptsofpersonalnetworksandfederationsofpersonal networks,andexplainstheirarchitecture.Itelaboratesindetailthevariousaspectsof thesearchitectures,includingtopicssuchasnetworking,self-configuration,security,per- sonalservices,servicesharing,andcontextmanagement.Italsodiscussestheoutcomes ofseveralpersonalnetworkresearchprojects,includingtheprototypes.Itisaimedat researchers,developers,andstandardizationexpertsinmobileandwirelesscommunica- tionsystemsandservices.Itshouldalsobeofinteresttograduatestudentsinthefieldof telecommunicationsanddistributedsystems. Thebookisorganizedasfollows.TheintroductoryChapter1describesthevisionunder- lyingpersonalnetworks.ThisisfollowedbyChapter2thatsetthestagebydiscussing userrequirementsandChapter3thatcoverstrendsinpersonalnetworking.Readerswho areuptodateonthestateoftheartofdevelopmentsinwirelessandmobiletechnologies andapplicationsandubiquitouscomputingmaygostraighttoChapter4thatdiscusses thepersonalnetworkarchitecture.Nextareseveraldetailedchaptersthatmayberead independently:Chapter5onclusterformationandrouting,Chapter6oninter-cluster tunneling,Chapter7oncommunicationbetweenapersonalnetworkandentitiesthatdo notbelongtoit(theso-calledforeigndevices),Chapter8onapplicationsupport,Chapter 9onsecurity,andChapter10onfederationsofpersonalnetworks.Chapter11introduces threedifferentexistingpersonalnetworkprototypesthatbuildsontheconceptsintroduced inthepreviouschapters.ThebookisroundedoffbyChapter12,whichgivestheauthors’ viewonthefutureofpersonalnetworks.