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 EPS MM UL CCCH DL CCCH UL DCCH DL DCCH DL DCCH UL DCCH EPS MM EPS MM EPS MM EPS MM UL DCCH DL DCCH EPS MM EPS MM EPS MM EPS MM UL DCCH DL DCCH UL DCCH DL DCCH DL DCCH UL DCCH EPS MM EPS MM EPS SM EPS SM EPS MM EPS MM UL DCCH DL DCCH UL DCCH
Attach request Unknown(0x0734)
rrcConnectionRequest rrcConnectionSetup
rrcConnectionSetupComplete rrcConnectionReconfiguration dlInformationTransfer
rrcConnectionReconfigurationComplete Security protected NAS message Authentication request Authentication response Unknown(0x077B)
ulInformationTransfer dlInformationTransfer
Security protected NAS message Security mode command Security mode complete Unknown(0x0790)
ulInformationTransfer ueCapabilityEnquiry ueCapabilityInformation securityModeCommand
rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete Security protected NAS message Attach accept
Activate default EPS bearer context request Activate default EPS bearer context accept Attach complete Unknown(0x072D)
ulInformationTransfer
rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete
attach.xlsAttach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 EPS MM UL DCCH DL DCCH EPS MM EPS MM DL DCCH EPS SM Detach request Unknown(0x0734)
ulInformationTransfer dlInformationTransfer
Security protected NAS message Detach accept
rrcConnectionRelease PDN connectivity request
deatch.xlsDetach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 UL CCCH DL CCCH UL DCCH DL DCCH UL DCCH DL DCCH DL DCCH UL DCCH DL DCCH UL DCCH Extended service request rrcConnectionRequest rrcConnectionSetup
rrcConnectionSetupComplete rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete securityModeCommand
rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete
UE 主叫信令.xlsUE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 EPS MM UL CCCH DL CCCH UL DCCH DL DCCH UL DCCH DL DCCH DL DCCH UL DCCH DL DCCH UL DCCH Paging
Extended service request rrcConnectionRequest rrcConnectionSetup
rrcConnectionSetupComplete rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete securityModeCommand
rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete rrcConnectionReconfiguration
rrcConnectionReconfigurationComplete
UE 被叫信令.xlsUE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 DL BCCH:DL SCH DL BCCH:DL SCH DL BCCH:DL SCH DL BCCH:DL SCH DL BCCH:DL SCH DL BCCH:DL SCH DL BCCH:DL SCH systemInformationBlockType1 systemInformation
systemInformationBlockType1 systemInformationBlockType1 systemInformation
systemInformationBlockType1 systemInformationBlockType1 systemInformationBlockType1
重选.xls重选信令流程详解