软交换相关原理及概念

爱立信软交换------相关原理及概念郑伟生Highlight软交换基本概念从MSC到MSCServer,GSM网络构架的演进MSCServerMGW网络拓扑及内外部接口Highlight软交换的基本概念从MSC到MSCServer,GSM网络构架的演进MSCServerMGW网络拓扑及内外部接口Softswitch——软交换机或软交换设备–于1997年由贝尔实验室提出–相对于传统的“硬”交换机而言，指实现呼叫控制和语音承载分离后通过软件实现呼叫控制等多种控制功能的一种设备Softswitching——软交换体系–指实现呼叫控制和呼叫承载分离后，利用多种接入手段实现接入，并基于核心IP网络进行传输的一种有机体系结构–主要特点是：体系分层、协议开放和标准化、实现综合接入业务什么是软交换？移动软交换移动软交换是用于移动网络中分层的电路域核心网络的技术,在这种分层结构的网络里，负责呼叫控制和业务管理的控制层与负责业务信息传输的连接层是从物理和逻辑上独立分开的。爱立信的软交换网络针对WCDMA和GSM是采用一个公共的电路域核心网络，即能从传统的GSM向3G网络演进。软交换的核心思想是：一个IP核心承载网呼叫控制与呼叫承载两分离Highlight软交换的基本概念从MSC到MSCServer,GSM网络构架的演进MSCServerMGW网络拓扑及内外部接口3GPP分层网络结构ApplicationServersApplicationServiceenablersServices/applicationsControlServersControlMSCHLR/AuC/FNRGMSC/TransitConnectivityMGWMGWServerServerPSTN/ISDNPLMNInternetIntranetsGSMEDGEWCDMAGGSNSGSNSGWUserdata爱立信的移动软交换实现MSCTraditionalMSC(controlandswitching)MSC-SMSCServer(Control)MobileMediaGateway(Switching)EricssonMobileSoftswitchSolutionTraditionalMSCSolutionMGWTDMMSCMSCMSCTDM/ATM/IPControlLayerConnectivityLayerMSC-SMGWMGWMGWMGWMGWMSCMSCTraditionalcircuit-switchednetworkLayeredArchitecturenetworkCommonGSM/WCDMAcoreforefficiency&investmentprotectionEricssonCircuitCoreNetworkVisionApplicationServersServiceenablersServices/applicationsApplicationServersMobile-PBNMGWPSTN/ISDNPLMNGSM/EDGEWCDMAMGWSeparatecomplexexecutionandcontrolfunctionsfromservicepayloadtransport•Optimumnodetechnology•Independentplanning,dimensioning&evolutionControlHLR/AuC/FNRSGWMSC/GMSC/TSCServerPoolCentralization&poolingofnetworkcontrolfunctionsPayloadusesshortestpathandmostefficientcodingSingleIPBackbone–efficientfordifferentapplicationsMSCMGWRelationbetweenMSC-serverandMGWMasterslaveH.248MGWactasBearerfunctionMGWpeerpeerMAP/CAPISUPBSSAPMGWactasSignalinggatewayMSC从传统的MSC演进到MSC-Server基于相同的平台（AXE）基于相同的软件版本（R10~R12）呼叫的承载功能移至MGW完成和传统电路域相关的硬件移至MGW(逐步)-支持宽带IP信令MSC-S结构O&MsupportapplicationsAPG40platformRPB-E100BaseTIP/EthernetSLIALIHSLGCP155Mb/sATMTDMO&MsupportapplicationsAPG40CplatformIPNRPB-S100BaseTEthernetSLIALIHSLGCP155Mb/sATMTDMETETSTSTCPorRPB-SGSGSO&MsupportapplicationsAPG40platformRPB-E100BaseTIP/EthernetSLIALIHSLGCP155Mb/sATMTDMO&MsupportapplicationsAPG40CplatformIPNRPB-S100BaseTEthernetSLIALIHSLGCP155Mb/sATMTDMETETSTSTCPorRPB-SGSGS-ISUPBSSAPINAP/CAPMAPBICCMSCServerBSSAPPSTN/PLMNTDMBSCTDMH.248MAPSMS-CHLRAucINAP/CAPSCPBSCBSSAP(Iu接口)TDMIP/MPLSBackbone(Seeslide15)Nb接口MSCServerVLRMGwSGWMGwSGW爱立信网络构架演进（1）爱立信网络构架演进（2）SGSNGGSNRNCBSCMGWSDHNetworkMGWMSCServerIP/ATMBackboneIPRIPRIPRGMSCServerPSTNISDNPLMNInternetIntranetServiceDelivery&ChargingSolutionsHSSFNRAUCEIRSMS-CMMSMPSOSGBGwCCNSCSOSS-RCRAN-OSSHighlight软交换的基本概念从MSC到MSCServer,GSM网络构架的演进MSCServerMGW网络拓扑及内外部接口Highlight软交换的基本概念从MSC到MSCServer,GSM网络构架的演进MSCServerMGW网络拓扑及内外部接口MGW媒体网关CPP平台介绍爱立信MGW特点及属性硬件配置各类板子介绍及实现功能软件配置及构架MGW工作原理MGW各类接口和MGW相关的重点概念介绍配置文件及脚本CPP平台（ConnectivityPacketPlatform)连接分组平台----面向3G的平台HWATMswitchscalable,modularHWmultiprocessorarchitectureprocessorclusterforcentralSWOSErealtimeoperatingsystemdistributedfilesystem:local,globalandreplicatedvolumesCPPHW-NodeArchitecture•1mainsubrack•0to30extensionsubract•SwitchModuleNumber(SMN)•startopology•redundantInterSubractLinks(ISL)main...CPPHW-Subrack•28slotspersubrack•AccessPointNumber(APN)•PlugInUnit(PIU)•communicationviabackplanecontrolledbySCB...11222802727...SCBSCBSlotAPNCPPHW-Boards•GPBGeneralPurposeBoard•SCBSwitchCoreBoard•SXBSwitchExtensionBoard•TUBTimingUnitBoard•ETM1ExchangeTerminalM1•ETM4ExchangeTerminalM4•SPBSpecialPurposeBoardMSBMPCMPMPMPBPBPBPBPBPBPBPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPDSPCPP处理器架构，ProcessorHierarchyICPICP=InternalControlPath•主处理器(MP)–高业务等级–用于中央控制和资源处理软件和节点管理业务•MP簇–提供程序级的冗余备份–提供运行条件下的软件升级•设备板处理器(BP)–用于板卡上运行软件的控制–较低的业务等级•专用目的处理器(SP)–用于协议处理和信令•数字信号处理器(DSP)–用于媒体流的处理CPP处理器架构-CoreMP•OnededicatedcoreMP•OnededicatedstandbycoreMP•Faulttolerantcore•Centralbasicnodefunction–Systemmanager–Restart,ethernetconnection,filehandling,cvhandlingCPPHW-FileSystem•HDonlyatMP•Dedicatedfilestructure•/dlocalvolume–localateachMP•/cglobalvolume–existsoncoreMP–mirroredtostandbycoreMP-cBPBPMPMPMP-cs/d/d/d/d/c/cCPPSW-LMdistribution•pgmtablemappingLMtoMP•RPUtablemappingactivetopassiveLM1aLM2pLM1aLM1pLM5pLM4pLM3pLM1pLM5aLM4aLM3aLM2aLM6aLM6pMP1MP4MP3MP2LM7aLM8aLM8aCPPSW-CV•Configurationdata–‘dt’–distributionlistfortheLM’s•program(pgm)–redundancyonLMlevel•ReliableProgramUnit(RPU)–SoftwareApplicationInformationNetworkCelloNodeANSSCCACTAETNSSCMAOMSEMASSPPOSOSACLSSPASApplicationAPIOperatorNCHCoreCPPSW-SubsystemStructureO&MCPPSW举例-LMviewofSPAS•Spas_resource_lm–CXC1321408_R6G03--coreMP(GPB)•Spas_connection_lm–CXC1320742_R10E02--allGPB•Spas_sm_lm–CXC1321409/3_R1F02--allSCB•Spas_link_lm–CXC1321407/3_R1E02--allSCB&SXBCPPSW-ProcessviewCelloSubsystemLoadmoduleProcessorProcessCPP节点备份机制（1）冗余，Redundancy•SwitchCoreBoard交换核心板:1+1热备份–故障时仅有少量ATM信元丢失•ISL链路:1+1或N+1冗余•电源分配:1+1冗余•ET-C41-4支持MSP1+1and设备保护(MultipleSectionProtectionandEquipmentProtection)–MSP提供对物理链路故障的保护–EP提供对板上硬件故障的保护•媒体流设备板以资源池方式配置–单板故障仅导致容量降级CPP节点备份机制(2)容错，Fau