(1)S1AP/InitialContextSetupRequest, MME >> MeNB
* 如果id-HandoverRestrictionList包含nRestriction参数,则表示LTE核心网禁止UE做NSA业务
(2)LTE-RRC_DCCH_DL (ueCapabilityEnquiry), MeNB >> UE
(3)LTE-RRC_DCCH_UL (ueCapabilityInformation), UE >> MeNB
(4)LTE-RRC_DCCH_DL (ueCapabilityEnquiry), MeNB >> UE
(5)LTE-RRC_DCCH_UL (ueCapabilityInformation), UE >> MeNB
(6)LTE-RRC_DCCH_DL (ueCapabilityEnquiry), MeNB >> UE
(7)LTE-RRC_DCCH_UL (ueCapabilityInformation), UE >> MeNB
* 如果UE未上报NR能力,则可能终端不具备5G能力
(8)S1AP/InitialContextSetupResponse, MeNB >> MME
(9)LTE-RRC_DCCH_DL (rrcConnectionReconfiguration), MeNB >> UE
(10)LTE-RRC_DCCH_UL (measurementReport), UE >> MeNB
(11)X2AP/SgNBAdditionRequest, MeNB >> SgNB
…
…
…
(12)X2AP/SgNBAdditionRequestAcknowledge, SgNB >> MeNB
…
* 如果SgNB添加失败,SgNB则回复为SgNBAdditionReject
(13)LTE-RRC_DCCH_DL (rrcConnectionReconfiguration), MeNB >> UE
(14)LTE-RRC_DCCH_UL (rrcConnectionReconfigurationComplete), UE >> MeNB
* 如果失败则UE随后立即回复RRC SCG Failure Information NR消息给MeNB。
(15)X2AP/SgNBReconfigurationComplete, MeNB >> SgNB
MeNB向SgNB确认UE已完成重配
(16)X2AP/SgNBReleaseRequest, MeNB >> SgNB
(17)X2AP/SgNBReleaseRequestAcknowledge, SgNB >> MeNB
(18)LTE-RRC_DCCH_DL (rrcConnectionReconfiguration), MeNB >> UE
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