5G QoS 学习笔记

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1、陈yy的自学笔记5GQos学习笔记(一)Qosmapping的流程1.信令流程1)SMF从PCF/PCC等网元获取Qos信息；2)UE或者AN发起PDUsessionmodification过程，AMF转发给SMF；3)SMF对AMF响应Nsmf_PDUSession_UpdateSMContext消息，这个消息中包含：N2SMinformation（PDUsessionid，QFI，Qosprofile，SessionAMBR）N1SMcontainer（PDUsessionid，Qosrule，QosflowlevelQosparameter，sess

2、ionAMBR）4)AMF收到后，将N2SMinformation发给AN节点；5)SISMcontainer中会有一个PDUSessionModificationCommand，指示给AMF是否要将这个container内容发给UE。陈yy的自学笔记5GQosUERANAMFSMFUPFUDMPCF1a.PDUSessionModificationRequest1a.Nsmf_PDUSession_UpdateSMContextRequest1b.PCFinitiatedSMPolicyAssociationModification1c.Nudm_SDM

3、_Notification1d.QoSUpdateTrigger1e.N2message(PDUsessionID,SMinformation)1e.Nsmf_PDUSession_UpdateSMContextRequest2.SMFinitiatedSMPolicyAssociationModification2a.N4SessionModificationRequest2b.N4SessionModificationResponse3a.Nsmf_PDUSession_UpdateSMContextResponse3b.Namf_Communicat

4、ion_N1N2MessageTransfer3c.Nsmf_PDUSession_SMContextStatusNotify4.N2SessionRequest5.AN-specificresourcemodification(includingPDUSessionModificationCommand/Ack)6.N2SessionResponse7a.Nsmf_PDUSession_UpdateSMContextRequest7b.Nsmf_PDUSession_UpdateSMContextResponse8a.N4SessionModificat

5、ionRequest9.PDUSessionModificationCommandAck8b.N4SessionModificationResponse10.N2NASuplinktransfer11a.Nsmf_PDUSession_UpdateSMContextRequest11b.Nsmf_PDUSession_UpdateSMContextResponse12a.N4SessionModificationRequest12b.N4SessionModificationResponse13.SMFinitiatedSMPolicyAssociatio

6、nModification2.RAN获知Qosprofile：SMF向RAN提供Qosprofile等内容从而实现QosFlowmaping，RAN使用这个Qosprofile进行空口资源的适配，SMF发给RAN的内容含有：QFIQosprofile可选的，对上行业务给出传输级别的报文标签值（从N3tunnel外部IP头提取的DSCP值）陈yy的自学笔记5GQos消息与接口：SMF->AMF->RANN2Sessionmanagement消息，见235024.3.3，SMF将Qosprofile和QFI带给RAN3.UE获得Qosrule/param

7、eter的方法1)信令显式配置，告知UE关于Qosflow到DRBmapping规则SMF以NAS信令的方式向UE提供以下内容。EachsignalledQoSrulecontains:a)anindicationofwhethertheQoSruleisthedefaultQoSrule;b)aQoSruleidentifier(QRI);c)aQoSflowidentifier(QFI);d)optionally,asetofpacketfilters;ande)aprecedencevalue.NOTE:ThedefaultQoSruleindica

8、tion(DQR)ofasignalledQoSrulecanno