VOLTE信令流程

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1、文档名称文档密级一、基于IMS的语音业务示意图PCRFMMEEPCE-UTRANIMSCoreS/P-GWSBCI/S-CSCFHandset/P-CSCFDefaultbearer:IMSSignalingSIP信令Dedicatedbearer:VoiceMedia语音处理过程：1、UE附着过程中为IMS信令建立一个默认的承载。2、UE发起呼叫，IMS的SIP信令通过默认承载经过P-GW送到IMSCore中接续呼叫。3、呼叫发起过程中建立IMS语音媒体的专有承载。4、主被叫的语音媒体流经过专有承载进行传送。注：PCRF在建立默认承

2、载和专有承载过程中分配和下发信令和媒体的QoS规则，保证信令和语音在承载通道中的质量。2014-12-24华为保密信息,未经授权禁止扩散第1页,共5页文档名称文档密级二、VOLTE信令流程图UEeNodeBMMEHSSS-GWRRCConnectionRequestRRCConnectionSetupRRCConnectionSetupComplete--AttachRequest--PDNConnectivityRequest--eSM-information-transfer-flagInitialUEMsgSendAuthent

3、icationInfoSendAuthenticationInfoAckDownlinkNASTransportRRCDLInfoTransfer--AuthenticationRequestRRCULInfoTransferUplinkNASTransport--AuthenticationResponseDownlinkNASTransportRRCDLInfoTransfer--SecurityModeCommandRRCULInfoTransferUplinkNASTransportUpdateLocation--Securi

4、tyModeCompleteUpdateLocationAckRRCDLInfoTransferDownlinkNASTransport--Apn1：ims--ESMInformationRequest--Apn2：cmnetRRCULInfoTransferUplinkNASTransport--ESMInformationResponseCreateSessionRequest--Apn1：imsCreateSessionResponseInitialContextSetupRequestRRCUECapEnquiry--Atta

5、chAcceptRRCUECapInfo--ActivateDefaultEPSBearerContextRequestUECapabilityInfoIndicationRRCSecurityModeRRCConnectionReconfigurationRRCSecurityModeCompleteRRCConnectionReconfigurationCompleteInitialContextSetupRespRRCULInfoTransferUplinkNASTransport--AttachCompleteModifyBe

6、arerRequest--ActivateDefaultEPSBearerContextAcceptModifyBearerResponse2014-12-24华为保密信息,未经授权禁止扩散第2页,共5页文档名称文档密级UEeNodeBMMEHSSS-GWRRCULInfoTransfer--PDNConnectivityRequestUplinkNASTransportCreateSessionRequest--Apn2：cmnetCreateSessionResponseE-RABSetupRequest--ActivateDef

7、aultEPSBearerContextRequestRRCConnectionReconfigurationRRCConnectionReconfigurationCompleteE-RABSetupResponseRRCULInfoTransfer--ActivateDefaultEPSBearerContextAcceptUplinkNASTransportModifyBearerRequestModifyBearerResponseNoDataTransmissionandnoIMSSignalinginUEInactiveT

8、imerUEContextReleaseRequestReleaseAccessBearersRequestReleaseAccessBearersResponseUEContextReleaseCommandRRCCo