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1、ericssonWhitepaper28423-3166Uen
2、February2012Itallcomesbacktobackhaulsolutionssupportingsuperiorend-to-endQualityofexperienceinhetnetdeploymentsBackhaulplaysacriticalroleinmobilebroadband,andisrisinginimportanceonaccountoftheintroductionofheterogeneousnetworks,knownashe
3、tnets.Deployingvastnumbersofsmallcellstocomplementimprovedanddensifiedmacrocelllayerswillrequirearangeofhighlyscalable,flexiblemobilebackhaulsolutionsthatsupportsuperioruserexperience.WHYHETNETSAREIMPORTANTTherapidlygrowingneedformobile-broadbandcapacityandcoverage,and
4、thereforeadditionalbackhaul,isbeingdrivenbytherisingpopularityofconnecteddevices–smartphones,tabletsandlaptops–aswellasbymobileappsandcloudcomputing.Inthefewyearssincesmartphoneshavebeencommerciallyavailable,shipmentshaverisendrastically,reachingalmost500millionunitsin
5、2011,whentheysurpassedPcshipmentsforthefirsttime[1].Smartphoneusersareconsumingmoredatathaneverbefore:anaverageofabout300MBpermonth[2],andhavedownloadedmorethan15billionapplicationsfromApple’sAppStorealonesinceitfirstopenedforbusinessin2008[2].Smartphoneshipments,bandw
6、idth-heavyservicesandrisingpopularityofapplicationsaresomeofthedriversbehindthetenfoldincreasethatisexpectedinmobiletrafficduringthenextfiveyears–reachingaprojectedglobalmonthlytotalofalmost5,000petabytesbytheendof2016[3].Mostoperatorswillbeabletomeettheserisingtraffic
7、demandsforsomeyearstocomeby:deployingmoreadvancedhsPaandltetechnologies;gainingaccesstoadditionalspectrum;implementingtechniquesthataremorespectrum-efficient;anddensifyingthemacrolayer.However,continuedenhancementanddensificationmaynotalwaysbethemostcost-efficientwayto
8、boostcapacityathotspotsandimproveperformanceindoorsandatcelledges.Insuchsituations,additionalcapacitycanbeprovidedbydeployingsmall,low-powercellsthatcoverlessextensiveareas.Tensofthousandsofthesecellscouldpotentiallybedeployedindensemobilenetworksinurbanareas.Radiocell
9、sthatareeffectivelyintegrated,coordinatedandsynchronizedenablethedeliveryMacroofhigh-capacity,high-qualitySmallcellmo
