G通訊的發(fā)展與應(yīng)用趨勢技術(shù)篇英文版課件

1、3G通訊的發(fā)展與應(yīng)用趨勢技術(shù)篇3G通訊的發(fā)展與應(yīng)用趨勢技術(shù)篇Contents Basic Concept of Mobile SystemDevelopment of Mobile CommunicationGSM Network ArchitectureCDMA Network ArchitectureContents Basic Concept of MobiObjectivesUnderstand the development of 3GName the concept of the three different multiple access technologies and un

2、derstand where each be usedUnderstand the IMT-2000 systemOn completion of this section will be able to:ObjectivesUnderstand the develYear 2000 and LaterBetter Voice ServiceHigh Rate Data AccessMore Value-added ServiceLarge CapacityHigher Spectrum EfficiencyMore Safe ServiceLow Operation CostHigh Qua

3、lity VoiceHigh Speed Mobile AccessMulti Media, E-CommercePersonalized ServiceNew Requirement90sBetter Voice ServiceSome Value-added ServiceLarge CapacityLow Operation CostEnhance Spectrum EfficiencyHigh Quality VoiceLower Data ServiceShort MessageCurrent RequirementEarlier Requirement80sVoice Servic

4、eCapacityBasic Voice Service,Voice QualityOperatorCustomerDifferent Period, Different Requirement Year 2000 and LaterBetter VoicDifferent Requirement, Different Technology 3G provides customers and operators with complete integrated service solutions AMPSTACSNMT其它Generation 1 in the 1980sAnalogAnalo

5、g technology (l) GSMCDMA IS95TDMAIS-136PDCGeneration 2 in the 1990sDigitalDigital technology Voice service Generation 3IMT-2000UMTSWCDMAcdma2000TD-SCDMABroadband service Different Requirement, DiffereMultiple Access TechnologiesUser 1User 2User 3TimeFrequencyFDMATimeFrequencyCodeCDMAUser3 User2 User

6、1 Based on codes, all users obtain traffic channels at the same time and on the same frequency band, for example, WCDMA and CDMA2000Traffic channels on different frequency bands are allocated to different users,for example, AMPS and TACSTraffic channels at different time slots are allocated to diffe

7、rent users, for example, DAMPS and GSMUser 1User 2TimeFrequencyTDMAUser 9User 10Multiple Access TechnologiesUsObjectives of 3GGlobally universal frequency band and standard, global seamless coverage Highly effective spectrum efficiencyHigher quality of service, security and reliabilityEasy to smooth

8、ly develop and transit from 2G, compatible with 2G in a reverse directionProviding multimedia services, with the rate of up to 2MbpsVehicle environment: 144kbpsEnvironment for walk: 384kbpsIndoor environment: 2MbpsObjectives of 3GGlobally univeIMT-2000 Technical Specification System3GSystemWCDMACore

9、 Network：Based on MAP & GPRSRTT： WCDMAFDD/TDD TD-SCDMARTT Specification：TD-SCDMAOther systems:EDGE DECTCDMA2000Network：Based on ANSI 41 & MAPRTT：CDMA2000IMT-2000 Technical SpecificatiComparison of the Three ModesWCDMAcdma2000TD-SCDMAStructure of the receiver RAKERAKERAKEClosed loop Power control Sup

10、portedSupportedSupportedHandoffSoft/hard handoff Demodulation modeCoherent demodulation Chip rate (Mcps) 3.84N*1.22881.28Mode of transmit diversityTSTDSTTDFBTDOTDSTSNoMode ofsynchronization AsynchronousSynchronousAsynchronousCore network GSM MAPANSI-41GSM MAPCoherent demodulation Coherent demodulati

11、on Soft/hard handoff Soft/hard handoff Comparison of the Three ModesWContents Basic Concepts of Mobile SystemDevelopment of Mobile CommunicationGSM Network ArchitectureCDMA Network ArchitectureContents Basic Concepts of MobObjectivesOn completion of this section the student will be able to: Name the

12、 data servicesUnderstand the 3 location servicesObjectivesOn completion of thiData Services032649.61281443842,000Video StreamingVoiceText MessagingStill ImagingAudio StreamingElectronic newspaperHigh-quality videoconferenceTelephone (Voice)Voice MailE-MailFax Electronic bookSports, news and weather

13、report on demand Singing roomLow-quality videoconferenceJPEG Still PhotosMobile RadioVideo Surveillance,Video Mail, TravelImageDataWeather, transportation, news, sports and securitiesMobile TVE-commerceRemoteMedical ServiceDevelopment orientation of a networkData Services032649.6128144384There are 3

14、 location technology standards: Location ServicesGPS-aided measurement Accuracy: Suburbs-10m City-3070m Indoorunable to locate Response time: 310sMeasurement of base station pilot phase Accuracy: 50200m Response time: 36sLocating of a cell ID Accuracy: depends on the size of a cell Response time: wi

15、thin 3sThere are 3 location technologVVVROOM !110! Bandit!The system transfers to the nearest alarm processing center based on the location information of the user reporting an alarm.An alarm button can be set on a users mobile phone to achieve the goal of reporting an alarm without any conversation

16、.Location ServicesVVVROOM !110! Bandit!The systeContents Basic Concepts of Mobile SystemDevelopment of Mobile CommunicationGSM Network ArchitectureCDMA Network ArchitectureContents Basic Concepts of MobObjectivesName the frequency spectrum used in GSMName the service areaName the two different cell

17、types and understand why and when each would be used.Name the concept of frequency reuse.Understand the Characteristic of radio communicationOn completion of this section will be able to:ObjectivesName the frequency sThe Division Of Radio FrequencyDifferent frequency has different propagation charac

18、teristicsThe Division Of Radio Frequency300-3000GHzEHFExtremely HighFrequency30-300GHzSHFSuper High Frequency3-30GHzUHFUltra High Frequency300-3000MHzVHFVery High Frequency30-300MHzHFHigh Frequency3-30MHzMFMedium Frequency300-3000KHzLFLow Frequency30-300KHzVLFVery-low Frequency3-30KHzVFVoice Frequen

19、cy300-3000HzELFExtremely LowFrequency30-300Hz3-30HzDesignationClassificationFrequencyThe Division Of Radio FrequencIMT-2000 Frequency Assignment185019001950200020502100215022002250ITUEuropeUSAMSSPCSADBBCDCEFAFEMSSReserveBroadcast auxiliary2165 MHz1990 MHz1850190019502000205021002150220022501880 MHz1

20、980 MHzUMTSGSM 1800DECTMSS1885 MHz2025 MHz2010 MHzIMT 2000MSSUMTSJapanMSSIMT 2000MSSIMT 2000PHS18951918BC1885AA2170 MHzIMT 20002110 MHz2170 MHzMSSMSSCDMATDDWLLFDDWLL19802025MHzGSM1800CDMAFDDWLL196019201945Chinacellular(1)cellular(2)cellular(2)1805 MHz186518651870188518901895191019301945196519701975I

21、MT-2000 Frequency Assignment1The Frequency SpectrumTACS/GSMSeparation 45MHzChannel Bandwidth: 200KHzETACS/EGSM872 890 905 915 917 935 950 960MHzTACS/GSMGSMETACS/ EGSMTACS/GSMGSMThe Frequency SpectrumTACS/GSMThe Frequency SpectrumSeparation: 95MHzChannel Bandwidth: 200KHzBase Station Receive1710 1785

22、 1805 1880MHzBase Station TransmitDCS 1800The Frequency SpectrumSeparatiThe Frequency SpectrumCDMA450MHz800MHz1900MHz2100MHzSeparation increasesThe Frequency SpectrumCDMA450MService Area PLMN service area.System area PLMN service areaMSC area.Location area.Base station area.Radio cell.MSC area.Locat

23、ion area.Base station area.Radio cellPLMN service areaService Area PLMN service areaCELLOmni1120degree123Omni-Directional Cells120 Degree SectorsCELLOmni1120123Omni-DirectionaFrequency Re-Use4(Site)X 3(Cell) Re-use51961027311591102128411739516Frequency Re-Use4(Site)X 3(CelIllustration of 4*3 Frequen

24、cy Reuse 1 2 3 4 5 6 7 8 9 10 11 12 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 Illustration of 4*3 Frequency Forward wave and Earth reflection wave（normal pr

25、opagation model）Troposphere lay reflection radio wave（propagation with the randomicity）Mountain diffracted wave （signal origin of shadow area）ionosphere reflection radio wave （over sight communication approach）Radio wave broadcast pathForward wave and Earth reflecDownlink and UplinkDownlink (in GSM)

26、Forward (in CDMA)Uplink (in GSM)Reverse (in CDMA)Downlink and UplinkDownlink (iPower ControlSave battery powerReduce interference8W0.8W5WBoth Uplink and Downlink power settings can be controlled independently and individually.Power ControlSave battery poweHandoffKeep voice/data successionIncrease ne

27、twork service qualityLow voice/data dropping rateBetter voice/data qualityHandoffKeep voice/data successTypes of HandoffSoft handoff A multi-sectors handoff, in which the mobile station keeps connecting with the previous base station. Soft handoff enhances the voice quality and decreases the possibi

28、lity of call dropping. Softer handoff Just like the soft handoff, the softer handoff takes place among the multi-sectors in the same base station.Hard handoff In the course of handoff, the mobile station will be disconnected from the previous base station before connecting with the next base station

29、. And this kind of handoff is characterized by a temporary disconnection of the traffic channel and includes Frequency change hard handoff Intersystem hard handoffTypes of HandoffSoft handoffSoft Handoff/Softer HandoffMulti-path combination in the BSC during soft handoffMulti-path combination in the

30、 BTS during softer handoffs Combine all the power from each sectorPower received from a single sectorSoft Handoff/Softer Handoff CoWhen loads of adjacent cells are different, the cell with heavier load lows its transmit rate and users at the edge of the cell hand off to the adjacent cells, so as to

31、implement load control. Cell BreathDynamic cell load allocation by cell breath brings better networkcoverage and larger system capacity.Load control mainly involves cell breath and handoff between cells on different frequencies.When loads of adjacent cells aMultipath FadingMultipath FadingDiversity

32、Time diversityBlock interleaving, error-correcting.Frequency diversityIn GSM system, use Frequency Hopping The CDMA signal energy is distributed on the whole 1.23MHZ bandwidth.Space diversityThe introduction of twin receive antennas .The RAKE Receivers of the mobile station and the base station can

33、combine the signals of different time delay.During a handoff, the mobile station contacts multiple base stations and searches for the strongest frame. Diversity Time diversitySpace DiversityWhen diversity is implemented two antennas are situated at the receiver. These antennas are placed several wav

34、elengths apart to ensure minimum correlation between the two receive paths.The two signals are then combined, this ensures that a low signal strength is less likely to occur.Compare oradd signalsResultant SignalApprox. 10 wavelengthsSpace DiversityWhen diversity Frequency HoppingEach time the BTS or

35、 mobile transmits a burst, it does so on a different RF carrier frequency.timefrequencyFrequency HoppingEach time theRAKE ReceiverThe RAKE technology can overcome the multi-path fading and enhance the receive performance of the system.Receive setCorrelator 1Correlator 2Correlator 3Searcher correlato

36、rCalculate the time delay and signal strength CombinerThe combined signaltts(t)s(t)RAKE ReceiverThe RAKE technoloVAD & DTXEncoding the speech silences at a rate of 500 bit/s rather than the full 13Kb/s.If the mobile does not transmit during silence there is a reduction in the overall power output requirementWithout DTXWith DTXComfort No