LTE-Uu口信令流程详解汇总
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LTE空口信令流程详解以及相关优化案例汇总1、附着信令流程
1.1 、Attach附着信令流程
（统计时延：红色的为开始和结束信令）
EPS MM Attach request
EPS MM Unknown(0x0734)
UL CCCH rrcConnectionRequest
DL CCCH rrcConnectionSetup
UL DCCH rrcConnectionSetupComplete
DL DCCH rrcConnectionReconfiguration
DL DCCH dlInformationTransfer
UL DCCH rrcConnectionReconfigurationComplete
EPS MM Security protected NAS message
EPS MM Authentication request
EPS MM Authentication response
EPS MM Unknown(0x077B)
UL DCCH ulInformationTransfer
DL DCCH dlInformationTransfer
EPS MM Security protected NAS message
EPS MM Security mode command
EPS MM Security mode complete
EPS MM Unknown(0x0790)
UL DCCH ulInformationTransfer
DL DCCH ueCapabilityEnquiry
UL DCCH ueCapabilityInformation
DL DCCH securityModeCommand
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete
EPS MM Security protected NAS message
EPS MM Attach accept
EPS SM Activate default EPS bearer context request
EPS SM Activate default EPS bearer context accept
EPS MM Attach complete
EPS MM Unknown(0x072D)
UL DCCH ulInformationTransfer
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete
attach.xls
Attach信令流程详解
1.2、Detach去附着信令流程
（统计时延：红色的为开始和结束信令）
EPS MM Detach request
EPS MM Unknown(0x0734)
UL DCCH ulInformationTransfer
DL DCCH dlInformationTransfer
EPS MM Security protected NAS message
EPS MM Detach accept
DL DCCH rrcConnectionRelease
EPS SM PDN connectivity request
deatch.xls
Detach信令流程详解
2、呼叫业务信令流程
2.1、UE主叫信令流程
（统计时延：红色的为开始和结束信令）
EPS MM Extended service request
UL CCCH rrcConnectionRequest
DL CCCH rrcConnectionSetup
UL DCCH rrcConnectionSetupComplete
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL DCCH securityModeCommand
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete
UE 主叫信令.xls
UE主叫信令流程详解
2.2、UE被叫信令流程
（统计时延：红色的为开始和结束信令）
DL PCCH Paging
EPS MM Extended service request
UL CCCH rrcConnectionRequest
DL CCCH rrcConnectionSetup
UL DCCH rrcConnectionSetupComplete
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL DCCH securityModeCommand
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete
UE 被叫信令.xls
UE被叫信令流程详解
3、重选与切换信令流程
3.1、小区重选信令流程
DL BCCH:DL SCH systemInformationBlockType1 DL BCCH:DL SCH systemInformation
DL BCCH:DL SCH systemInformationBlockType1 DL BCCH:DL SCH systemInformationBlockType1 DL BCCH:DL SCH systemInformation
DL BCCH:DL SCH systemInformationBlockType1 DL BCCH:DL SCH systemInformationBlockType1 DL BCCH:DL SCH systemInformationBlockType1
重选.xls
重选信令流程详解