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1、Wireless Data Services In Cdma2000,ByMohammed Yousuf Shareef St Id#220326,Introduction,Cdma-Code Division Multiple Access.Spread Spectrum technique using Direct Sequence i.e.each data bit is represented(spread)by multiple bits in transmitted signal.Cdma2000-multi carrier mode CdmaIt supports data ra
2、tes both circuit and packet switched of 9.6kbps to 2 Mbps.Operates in wide range of environmentsOutdoor Mega cells(cells 35km radius)Outdoor macro cells(1-35 km radius)Indoor/outdoor micro cells(1km radius)Indoor/outdoor Pico cells(50-m radius),Contd,Cdma2000 can be deployed inIndoor/Outdoor environ
3、mentWireless Local LoopsVehicular EnvironmentsMixed Vehicular&Indoor/Outdoor Environments Cdma2000 services supportOverlay configurationBackward compatibility to TIA/EIA-95B signaling&networkGraceful&gradual upgrade from 2G to 3 G systems Common channels with an underlay TIA/EIA-95B system during tr
4、ansition periods,Contd,CDMA 2000 is a radio and network access system that is part of the IMT-2000(ITU)specification suite of 3G systems.Goals of IMT-2000:Global Standard.High Speed Packet Data Services:2Mbps for stationary use.384kbps for pedestrian use.144kbps for vehicular use.3G applications ena
5、bled by CDMA 2000:Packet based services like,wireless Internet,e-mail,ecommerceand multimedia,location based services,longer battery life.,Evolution Of Wireless Technologies,Wireless Technologies,1GAnalog based cellular technologyServicesVoice2GDigital technologiesServicesVoiceLow rate data3GService
6、sVoiceHigh Speed Data,1St Gen,2G,3G,Evolution Of Wireless Technologies,CDMA 2000 enables migration from and seamless backward compatibility tocdmaOne 2G to 3G without fork-lifting the legacy system.CDMA 2000 migration path:CDMA 2000-1X(1xRTT)Currently available.Incorrectly considered 2.5G.First vers
7、ion of CDMA 2000 by Qualcomm.144kbps data rate and 1.5 times the voice capacity.1xEV-DO(HDR)Evolution of 1x to provide high data rate only,over a separate carrier.2.4Mbps downstream and 300kbps upstream.,Evolution Of Wireless Technologies,1xEV-DVEvolution of 1x to provide high data rate and voice ca
8、pacity.5.2Mbps.CDMA 2000-3X(3xRTT)Conceptual phase.Use of a new 3.75MHz(3 x1.25MHz)spectrum.,CDMA Advantage,GSM is discrete with no forward and backward compatibilityCDMA terminals are fully forward and backward compatible.,Approximate Download time for 3 minute mp3,NetworkMax.Data RateDownload time
9、GSM9.6Kbps41 minutesIS95-A CDMA14.4Kbps31 minutesGPRS45Kbps9 minutesIS95-B CDMA64Kbps6 minutesCDMA 2000-1X307Kbps1.5 minutesWCDMA384Kbps61 secondsCDMA2000 1XEV-DO2.4Mbps11 seconds,CDMA 2000 Forward Link,CDMA 2000 Forward Link,Spreading RatesSR1(1.2288Mcps)and SR3(3xRTT).Nine forward link radio confi
10、gurationsRC1-RC9.Each RC is characterized by physical layer parameters such as different modulation and coding.RC Max.Data Rate Code Rate SR1 9.6kbps 1/2 SR12 14.4kbps 1/2 SR13 153.6kbps 1/4SR16 307.2kbps 1/6 SR19 1.036Mbps 1/3 SR1,CDMA 2000 Forward Link,New Common Channels:7 Forward Common Control
11、Channels(F-CCCH)Signaling and MAC messages.8 Forward Broadcast Control Channels(F-BCCH)Paging messages.-Specifically for CDMA2000 mobiles to reduce load on cdmaOne channels.Forward Common Auxiliary Pilot Channel(F-CAICH)Used to generate spot beams in a particular area(hot spot).3 Forward Quick Pagin
12、g Channels(F-QPCH)Indicator to the mobile to wake up for a message on the paging channel.Useful for conserving battery during idle time.4 Forward Common Power Control Channels(F-CPCCH)Used to control the reverse access channels.,CDMA 2000 Forward Link,Dedicated Channels:cdmaOne:Forward Fundamental C
13、hannel(F-FCH)Primarily for voice,but may carry data up to 14.4kbps.IS-95B(2.5G):Up to 7 Forward Supplemental Code Channels(F-SCCH)per userStrictly for data traffic supporting either RC1 or RC2.Multiple channel aggregation:9.6-115.2kbps.New Dedicated Channels:Forward Dedicated Common Control Channel(
14、F-DCCH)High-priority data traffic,such as data re-transmissions.Up to 2 Forward Supplemental Channels(F-SCH)per userAlso only for data,but supports RC3 through RC9.,CDMA 2000 Reverse Link,CDMA 2000 Reverse Link,New Common Channels:Reverse Enhanced Access Channel(REACH).Reverse Common Control Channel
15、(RCCCH).Used to provide more reliable and power efficient access.Dedicated Channels:cdmaOne:Reverse Fundamental Channel(R-FCH).IS-95B(2.5G):Up to 7 Reverse Supplemental Code Channels(R-SCCH)per user.New Dedicated Channels:Reverse Dedicated Control Channel(R-DCCH).Up to 2 Reverse Supplemental Channel
16、s(R-SCH)per user.Reverse Pilot Channel(R-PICH)Improves reception at the receiver.Power control bits multiplexed(at 800Hz)for forward link power control.,Packet Data Call,Packet Data Call,a)In Origination Message,MN requests packet dataservice(can also request supplementary services likefax over circ
17、uit.)b)BSC acknowledges.c)BSC sends Service Request message to MSC.d)After authentication,MSC sends channel Assignment Request message.e)Forward and Reverse channel assignment procedures(same as(e)thru(j).f)A9-Setup-A8 message to PCF to establish A8 connection.g)Procedure for establishing A10/A11 co
18、nnection between PCF and PDSN(R-P interface).h)PCF transmits A9-Connect-A8 message to BSC.i)BSC transmits Assignment Complete message to MSC.j)PPP connection establishment procedure and Mobile IP registration procedure initiated.,3G Network Architecture,Contd,IP MobilityAbility to move with an IP ad
19、dress while the connection using the IP address is activeIP Mobility may be provided by a combination of“RAN mobility”and“CN mobility”Radio Access Network IP mobilityHandoff/handoverCell selection/reselectionCore Network IP mobilityMobile IP,GPRS,Cdma2000 Network Architecture,AAA:Authentication,Auth
20、orization and AccountingFA:Foreign AgentGR:Gateway RouterHA:Home AgentPDSN:Packet Data Serving Node,Cdma2000 packet Data Network Architecture,Cdma2000 Layering Structure,Upper Layer ServicesVoice End User data bearing servicesSignalingLower Layer Link Access Control(LAC)Media Access Control(MAC),Con
21、td,LAC manages point to point communication channels MAC provides 3 functionsMedia Access control stateBest Effort DeliveryMultiplexing&QOS control,Cdma2000 Layer Structure,Layer functionsSignaling ControlData ServicesVoice ServicesMac Control statesQosResource AllocationMultiplexingCoding&Modulatio
22、n,Packet Data Mac Operation States in Cdma2000&TIA/EIA-95B,Contd,Active StateTraffic,PC and control channels assignedControl Hold StatePC and Control channels assignedVery fast traffic channel reassignmentSuspended StateNo Dedicated ChannelsFast traffic ChannelReassignmentRLP state may be maintained
23、PPP state maintainedSlotted sub mode,Contd,Dormant StateNo dedicated channelsNo BS,MSC resourcesPPP state maintainedShort data bursts,Channel Bandwidths and Data rates supported by Cdma2000,Services Of CDMA2000 Networks,Short Message Services(SMS)low cost/high value services increased network traffi
24、chigher profits and greater customer loyaltyMessage Over IP-SMSOver-the-Air Services E-Mail DistributionUnified Messaging:The end-user can send,retrieve and manage e-mail,voice mail and fax mail with one subscription,to one service,provided by one operator.,AAA Services cdma2000 networks,AAA Service
25、s of Cdma2000 NetworksMigrate from a“one size fits all”model to personalized servicesPackage premium services for both residential and corporate usersCollect detailed usage information for flexible billing optionsTrack resource usage in real time for guaranteed access and access control.AAA consists
26、 of three key functions:Authentication recognize the user Authorization enforce access controls and deliver services Accounting track users usage of network resources,Vendors Of Cdma2000,cdma2000(3GPP2)Vendors Qualcomm Lucent Nortel Motorola Samsung,Ericsson,OperatorsSprint PCSVerizon,KDDI,SKT,Concl
27、usion,A brief overview of wireless data services has been presented New Channels Of Forward and Reverse channel specifications of cdma2000 is shown.Network Architecture Of Cdma2000 has presented Various wireless data services likeSMSUnified MessagingAAA Services of cdma2000 networks,References,Wirel
28、ess Network evolution by Vijay K.Garg.“cdma2000:A Third generation radio transmission technology”,Bell Labs technical Journal,sept.1998.TIA/EIA IS-2000-3“Medium Access Control Standard for cdma2000 Spread Spectrum Systems,”Nov.1999.Douglas N.Kinsley,Sarath Kumar,Subhasis Laha,and Sanjiv Nanda,”Evolution Of Wireless Data Services IS-95 to cdma2000”Technology Primer AAA Services for Cdma2000 Networks,Bridge Water Systems,
