LTE空口信令流程详解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
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
1.3、前台测试中Detach& Attach信令流程
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 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 2.3、前台测试中UE主叫、切换L3信令流程
2.4、后台软件中掉线、接入、RRC连接的L3信令与对应的Event事件
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
3.2、基站内同频切换信令流程
（统计时延：红色的为开始和结束信令）
UL DCCH measurementReport
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL BCCH:DL SCH systemInformationBlockType1
DL BCCH:DL SCH systemInformationBlockType1
DL BCCH:DL SCH systemInformationBlockType1
DL BCCH:DL SCH systemInformationBlockType1
DL BCCH:DL SCH systemInformation
3.3、基站间同频切换信令流程
（统计时延：红色的为开始和结束信令）
UL DCCH measurementReport
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete DL BCCH:DL SCH systemInformationBlockType1
DL DCCH rrcConnectionReconfiguration
UL DCCH rrcConnectionReconfigurationComplete 4、跟踪区域更新信令流程
4.1、新小区所属跟踪区域不在终端跟踪区域列表中信令流程
4.2、周期性跟踪区域更新信令流程
4.2、ENODEB间同频切换及TAU更新流程
4.2、ENODEB间同频切换MR中的消息