CPRI测试仪.ppt
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1、CPRI Option for TX300Training REV Cn Network Overviewn CPRI Technology Primern Test Methodologyn TX300 CPRI Configuration and ResultsVeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.2AgendaNetwork OverviewConfidential&Proprietary Information of VeEX Inc.3VeEX CPRI TrainingConfident
2、ial&Proprietary Information of VeEX Inc.4Traditional RAN ArchitectureTraditional MacrocellCoreBTS/NodeBBTS/NodeBBTS/NodeBBSC/RNCUuBase StationBackhaul:Ethernet or E1/T1 VeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.5Base Station co-located with Radio Tower Base Station/Node BTra
3、ditional deployment the base station functions are co-located with the radio tower at the base of the antenna or basement of a tall building.Drawbacks of co-location:nRF transceiver and power amplifier needed to drive the radio functions are co-located with the other functions of the base station su
4、ch as backhaul transport,control and baseband processing.nNeeds to be physically located very close to the antenna because they are driven over very lossy electrical cables.nHigh power dissipation requires that require costly special enclosures with climate control and power redundancynMakes it diff
5、icult to install and find a location that can host the enclosure and/or increase lease price due to additional space needed Electrical cableVeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.6Distributed Antenna System ModelDASRERERadio Equipment ControllerRadio EquipmentREREC handle
6、s:Network Interface transport Radio base station control and managementDigital baseband processingRECBackhaul:Ethernet over Fiber/MicrowaveRE handles:Radio frequency functionsPower amplifierFronthaul:CPRI/OBSAI over Fiber Base Station Hotelin CO or ColocationDAS is not to be confused with micro-cell
7、,pico cells!VeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.7Benefits of distributed modelnOne REC(Radio Equipment Controller)can manage many REs(Radio Equipment)nREC can be physically located far from radio towers in a centralized indoor location and temperature controlled enviro
8、nmentnREC to RE optical link allows long distances(up to 10 km)without loss.nSimplified RE function makes it more compact,easier to install and therefore increases the number of possible sites nFurther economy of scale by having one REC manage many towers,and also increases the deployment flexibilit
9、y to add new cell sites.VeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.8The need for CPRI/OBSAInThe communication link between the REC and RE must be able to support:Transport of digital radio data over either optical or electrical media Transport mechanism flexible to support mu
10、ltiple protocols(UMTS,WiMAX,LTE)Support demand for large bandwidth In-band transport of a high-stability network frequency and time references Accurate calibration of the link delay Multi-vendor interoperabilitynCPRI and OBSAI are two competing standardsnCPRI stands for Common Public Radio Interface
11、,this protocol has been developed by Ericsson AB,Huawei Technologies Co.Ltd,NEC Corporation,Alcatel Lucent and Nokia SiemensnOBSAI stands for Open Base Station Architecture Initiative,this protocol has been developed by Hyundai,LGE,Nokia,Samsung and ZTEnCPRI Rates range from 614 Mbps to 9.8 GbpsnOBS
12、AI Rates range from 728 Mbps to 6.8 GbpsnCPRI has higher market penetration rate than OBSAIVeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.9CPRI vs OBSAICPRI Technology PrimerConfidential&Proprietary Information of VeEX Inc.10VeEX CPRI TrainingConfidential&Proprietary Information
13、of VeEX Inc.11CPRI OverviewnCPRI stands for Common Public Radio Interface,this protocol has been developed by Ericsson AB,Huawei Technologies Co.Ltd,NEC Corporation,Alcatel Lucent and Nokia SiemensnIt is an industry cooperation aimed at defining a publicly available specification for the key interna
14、l interface of radio base stations between the Radio Equipment Control(REC)and the Radio Equipment(RE)nThe standard is public and can be downloaded from http:/www.cpri.info/nThe current version is v4.2(2010-09-29)VeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.12CPRI Interface Spe
15、cificationsnCPRI specification defines only Layer 1 and Layer 2nSpecification written with the goal to be generic enough to support scalable rates,physical access medium type and air interface technologiesVeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.13CPRI Protocol StackElectri
16、cal PHYOptical PHYLine coding:8b/10bFraming&Time Division MuxCPRI Layer 1Physical LayerData Link LayerUser DataControl&ManagementSYNCCPRI Layer 2VeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.14Physical LayerThe following Line bit rates are defined in the standard:CPRI line bit r
17、ate option 1:614.4 Mbit/s CPRI line bit rate option 2:1228.8 Mbit/s(2 x 614.4 Mbit/s)CPRI line bit rate option 3:2457.6 Mbit/s(4 x 614.4 Mbit/s)CPRI line bit rate option 4:3072.0 Mbit/s(5 x 614.4 Mbit/s)CPRI line bit rate option 5:4915.2 Mbit/s(8 x 614.4 Mbit/s)CPRI line bit rate option 6:6144.0 Mbi
18、t/s(10 x 614.4 Mbit/s)CPRI line bit rate option 7:9830.4 Mbit/s(16 x 614.4 Mbit/s)Rates chosen to be integer multiples of UMTS chip rate at 3.84 MVeEX CPRI TrainingConfidential&Proprietary Information of VeEX Inc.15Physical LayerLine coding:8B/10B line coding shall be used for serial transmission ac
19、cording to IEEE 802.3-2005,clause 36.(Same encoding as used for Gigabit Ethernet and Fibre Channel)Bit Error correction/detection:The physical layer is designed in such a way that a very low bit error ratio can be achieved without expensive forward error correction schemes.Therefore,no general bit e
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