TDLTE关键过程信令流程解析精.docx

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TDLTE关键过程信令流程解析精.docx

TDLTE关键过程信令流程解析精

TD-LTE关键过程信令流程解析

1.目的

该文档通过对TD-LTE信令流程的说明和解析,向读者详细描述了TD-LTE信令流程和信令解码,有助于帮助读者在读懂信令的基础上,更好地分析信令,分析问题。

2.关键过程信令流程解析

E-UTRAN初始附着过程

1、流程概述——对于过程进行整体描述

附着过程就是UE向网络注册的过程。

注册成功,UE和MME从都会进入EMM注册状态。

网络根据用户UE当前状态和签约的信息为用户提供“一直在线”的IP服务连接。

附着过程结束,在MME里面为UE建立起一个上下文,在UE和PGW间为UE建立起一条默认EPS承载。

UE刚开机时,先进行物理下行同步,搜索测量进行小区选择,选择到一个suitable或者acceptable小区后,驻留并进行附着过程。

附着流程图如下:

Attach流程图

说明:

1步骤1~5会建立RRC连接,步骤6、9会建立S1连接,完成这些过程即标志着

NASsignallingconnection建立完成。

2消息7的说明:

UE刚开机第一次attach,使用的IMSI,无Identity过程;后续,

如果有有效的GUTI,使用GUTIattach,核心网才会发起Identity过程(为上下行直传消息。

3消息10~12的说明:

如果消息9带了UERadioCapabilityIE,则eNB不会发送

UECapabilityEnquiry消息给UE,即没有10~12过程;否则会发送,UE上报无线能力信息后,eNB再发UECapabilityInfoIndication,给核心网上报UE的无线能力信息。

为了减少空口开销,在IDLE下MME会保存UERadioCapability信息,在

INITIALCONTEXTSETUPREQUEST消息会带给eNB,除非UE在执行attach或

者"firstTAUfollowingGERAN/UTRANAttach"or"UEradiocapabilityupdate"TAU

过程(也就是这些过程MME不会带UERadioCapability信息给eNB,并会把本地

保存的UERadioCapability信息删除,eNB会问UE要能力信息,并报给MME。

注:

"UEradiocapabilityupdate"TAUisonlysupportedforchangesofGERANand

UTRANradiocapabilitiesinECM-IDLE.。

在CONNECTED下,eNB会一直保存UERadioCapability信息。

UE的E_UTRAN无线能力信息如果发生改变,需要先detach,再attach。

4发起UE上下文释放(即21~25的条件:

eNodeB-initiatedwithcausee.g.O&MIntervention,UnspecifiedFailure,UserInactivity,RepeatedRRCsignallingIntegrityCheckFailure,ReleaseduetoUEgeneratedsignallingconnectionrelease,etc.;orMME-initiatedwithcausee.g.authenticationfailure,detach,etc.

5eNB收到msg3以后,DCM给USM配置SRB1,配置完后发送msg4给UE;eNB

在发送RRCConnectionReconfiguration前,DCM先给USM配置DRB/SRB2等信息,配置完后发送RRCConnectionReconfiguration给UE,收到RRCConnectionReconfigurationComplete后,控制面再通知用户面资源可用。

6消息13~15的说明:

eNB发送完消息13,并不需要等收到消息14,就直接发送消

息15。

7如果发起IMSIattach时,UE的IMSI与另外一个UE的IMSI重复,并且其他UE

已经attach,则核心网会释放先前的UE。

如果IMSI中的MNC与核心网配置的不一致,则核心网会回复attachreject。

8消息9的说明:

该消息为MME向eNB发起的初始上下文建立请求,请求eNB建

立承载资源,同时带安全上下文,可能带用户无线能力、切换限制列表等参数。

UE的

安全能力参数是通过attachrequest消息带给核心网的,核心网再通过该消息送给eNB。

UE的网络能力(安全能力信息改变的话,需要发起TAU。

2、消息解析——对于关键参数进行解析

(1MasterInformationBlock(主信息块

RRC:

MasterInformationBlock

Messagetype:

BCCH_BCH

Direction:

Downlink

FrameNo:

1020

SubframeNo:

4

ComputerTimestamp:

17:

23:

26.843

BCCH-BCH-Message

message

dl-Bandwidth:

n100(下行带宽,目前配置为100PRB,20MHz带宽

phich-Config

phich-Duration:

normal(PHICH持续时间

phich-Resource:

half(PHICH资源大小,Ng配置为1/2即可保证PHICH资源够用,一般系统内的资源占用率不会到100%,上行单次传输平均占用的资源块数也可能比较大,此时一个PHICH组内实际占用的资源数会比较小,能够保证传输性能。

systemFrameNumber:

0xFF

spare:

0x0000

(2SysInfoType1(系统信息块1

RRC:

SysInfoType1

Messagetype:

BCCH_SCH

Direction:

Downlink

FrameNo:

1022

SubframeNo:

7

ComputerTimestamp:

17:

23:

26.843

BCCH-DL-SCH-Message

message

c1

systemInformationBlockType1

cellAccessRelatedInfo

plmn-IdentityList

PLMN-IdentityInfo

plmn-Identity

mcc

MCC-MNC-Digit:

4

MCC-MNC-Digit:

6

MCC-MNC-Digit:

0

mnc

MCC-MNC-Digit:

0

MCC-MNC-Digit:

0

cellReservedForOperatorUse:

notReserved

trackingAreaCode:

0x0200(小区所属跟踪区的ID

cellIdentity:

0x00099020

cellBarred:

notBarred

intraFreqReselection:

allowed

csg-Indication:

false

cellSelectionInfo

q-RxLevMin:

-60(小区重选最小信道要求,目前配置为-60dBmp-Max:

23(UE最大发射功率,目前配置为23dBm

freqBandIndicator:

38(E-UTRA工作频段,38指2570Mhz-2620Mhz

schedulingInfoList

SchedulingInfo

si-Periodicity:

rf32

sib-MappingInfo

sibType3

sibType4

tdd-Config

subframeAssignment:

sa1(上下行子帧配置,sa1指2U2D

specialSubframePatterns:

ssp7(特殊子帧配置,ssp7指10:

2:

2si-WindowLength:

ms10

systemInfoValueTag:

0

(3SysInfo(系统信息块

RRC:

SysInfo

Messagetype:

BCCH_SCH

Direction:

Downlink

FrameNo:

0

SubframeNo:

5

ComputerTimestamp:

17:

23:

26.843

BCCH-DL-SCH-Message

message

c1

systemInformation

criticalExtensions

systemInformation-r8

sib-TypeAndInfo

sib2

radioResourceConfigCommon

rach-ConfigCommon

preambleInfo

numberOfRA-Preambles:

n48(竞争前导码数量,预留48个Preamble码用于竞争随机接入

preamblesGroupAConfig

sizeOfRA-PreamblesGroupA:

n48

messageSizeGroupA:

b56

messagePowerOffsetGroupB:

dB8

powerRampingParameters

powerRampingStep:

dB2

preambleInitialReceivedTargetPower:

dBm-106

ra-SupervisionInfo

preambleTransMax:

n4

ra-ResponseWindowSize:

sf10

mac-ContentionResolutionTimer:

sf48

maxHARQ-Msg3Tx:

4

bcch-Config

modificationPeriodCoeff:

n4

pcch-Config

defaultPagingCycle:

rf64

nB:

halfT

prach-Config

rootSequenceIndex:

24(前导码根序列逻辑索引,当采用PreambleFormat0~3时,ZC根序列的选择与当前小区是否为高速小区有关,当采用PreambleFormat0~3且为高速小区时,RootSeqIndex的取值与Ncs有关,Preamble格式影响RootSeqIndex的取值范围以及选择原则

prach-ConfigInfo

prach-ConfigIndex:

3

highSpeedFlag:

false

zeroCorrelationZoneConfig:

3

prach-FreqOffset:

17

pdsch-ConfigCommon

referenceSignalPower:

15(小区参考信号功率,15对应全带宽等效总功率45.79dBm

p-b:

1(无CRS的OFDM符号上的数据RE与有CRS的OFDM符号上数据RE的能量之比,一般取1,即功率比为1:

1

pusch-ConfigCommon

pusch-ConfigBasic

n-SB:

4

hoppingMode:

interSubFrame

pusch-HoppingOffset:

33

enable64QAM:

true

ul-ReferenceSignalsPUSCH

groupHoppingEnabled:

false

groupAssignmentPUSCH:

0

sequenceHoppingEnabled:

false

cyclicShift:

0

pucch-ConfigCommon

deltaPUCCH-Shift:

ds2

nRB-CQI:

2

nCS-AN:

0

n1PUCCH-AN:

36

soundingRS-UL-ConfigCommon

setup

srs-BandwidthConfig:

bw0

srs-SubframeConfig:

sc0

ackNackSRS-SimultaneousTransmission:

true

srs-MaxUpPts:

true

uplinkPowerControlCommon

p0-NominalPUSCH:

-85(持续调度期望接收功率,根据需要随时修改

alpha:

al1

p0-NominalPUCCH:

-112(PUCCH期望功率,根据需要随时修改

deltaFList-PUCCH

deltaF-PUCCH-Format1:

deltaF0

deltaF-PUCCH-Format1b:

deltaF1

deltaF-PUCCH-Format2:

deltaF0

deltaF-PUCCH-Format2a:

deltaF2

deltaF-PUCCH-Format2b:

deltaF2

deltaPreambleMsg3:

4

ul-CyclicPrefixLength:

len1

ue-TimersAndConstants

t300:

ms2000(T300定时器时长,当UE发送RRCCONNECTIONREQUEST消息后启动T300定时器,当收到RRCCONNECTIONSETUP消息后停止T300定时器。

一旦超时,若RRCCONNECTIONREQUEST消息重发次数小于常量N300则重发RRCCONNECTIONREQUEST,否则进入空闲模式。

T300的设置应结合UE、UTRAN处理时延以及传播时延考虑,T300设置越大,UE等待时间越长。

N300设置越大,RRC连接成功建立的可能性越高,同时用于RRC建立的时间也可能越长,有可能出现某个UE反复尝试接入和发送连接建立请求,而对其它用户造成较强干扰的情况。

t301:

ms600(用户摘机定时器

t310:

ms2000

n310:

n20

t311:

ms1000

n311:

n1

freqInfo

additionalSpectrumEmission:

1

timeAlignmentTimerCommon:

infinity

sib3

cellReselectionInfoCommon

q-Hyst:

dB2

cellReselectionServingFreqInfo

s-NonIntraSearch:

2

threshServingLow:

0

cellReselectionPriority:

3

intraFreqCellReselectionInfo

q-RxLevMin:

-53

p-Max:

23(UE最大发射功率,目前配置为23dBm

s-IntraSearch:

3

allowedMeasBandwidth:

mbw6

presenceAntennaPort1:

true

neighCellConfig:

0x40

t-ReselectionEUTRA:

3

sib4

intraFreqNeighCellList

IntraFreqNeighCellInfo

physCellId:

0

q-OffsetCell:

dB0

IntraFreqNeighCellInfo

physCellId:

1

q-OffsetCell:

dB0

IntraFreqNeighCellInfo

physCellId:

4

q-OffsetCell:

dB0

IntraFreqNeighCellInfo

physCellId:

5

q-OffsetCell:

dB0

(4AttachRequest

Messagetype:

EPSMM

Direction:

Uplink

ComputerTimestamp:

17:

23:

02.843

FrameNo:

674

SubframeNo:

6

AttachRequest

Securityheadertype:

(0PlainNASmessage,notsecurityprotected

protocol_discriminator:

EPSMobilityManagement

NASEPSMobilityManagementMessageType:

(0x41Attachrequest

Typeofsecuritycontextflag(TSC:

(0Nativesecuritycontext

NASkeysetidentifier:

(0

Sparebit(s:

0

EPSattachtype:

(1EPSattach

EPSmobileidentity-OldGUTIorIMSI

Length:

11octets

odd/evenindic:

0

Typeofidentity:

(6GUTI

MobileCountryCode(MCC:

(460China(People'sRepublicof(移动国家码

MobileNetworkCode(MNC:

(00ChinaMobile(移动网络码

MMEGroupID:

32768

MMECode:

50

M-TMSI:

0x203f09(临时移动用户识别

UEnetworkcapability

Length:

4octets

EEA0:

(1Support

128-EEA1:

(1Support

128-EEA2:

(1Support

EEA3:

(0Notsupport

EEA4:

(0Notsupport

EEA5:

(0Notsupport

EEA6:

(0Notsupport

EEA7:

(0Notsupport

EIA0:

(1Support

128-EIA1:

(1Support

128-EIA2:

(1Support

EIA3:

(0Notsupport

EIA4:

(0Notsupport

EIA5:

(0Notsupport

EIA6:

(0Notsupport

EIA7:

(0Notsupport

UEA0:

(0Notsupport

UEA1:

(0Notsupport

UEA2:

(0Notsupport

UEA3:

(0Notsupport

UEA4:

(0Notsupport

UEA5:

(0Notsupport

UEA6:

(0Notsupport

UEA7:

(0Notsupport

UCS2support(UCS2:

(0Notsupport

UMTSintegrityalgorithmUIA1:

(0Notsupport

UMTSintegrityalgorithmUIA2:

(0Notsupport

UMTSintegrityalgorithmUIA3:

(0Notsupport

UMTSintegrityalgorithmUIA4:

(0Notsupport

UMTSintegrityalgorithmUIA5:

(0Notsupport

UMTSintegrityalgorithmUIA6:

(0Notsupport

UMTSintegrityalgorithmUIA7:

(0Notsupport

ESMmessagecontainer

Length:

29octets

ESMmessagecontainercontents:

21d01127178080211011010816000083600000a0

0000....=EPSbeareridentity:

0

....0010=protocol_discriminator:

(2EPSsessionmanagement

messages

Proceduretransactionidentity:

1

NASEPSsessionmanagementmessages:

(0xd0PDNconnectivityrequest

PDNtype:

(1IPv4

Requesttype:

(1Initialrequest

ProtocolConfigurationOptions

ElementID:

39

Length:

23octets

Ext:

1

Configurationprotocol:

(0PPP

Protocolinformation:

[0]:

ProtocolID:

IPCP(Hex8021

Contentslength:

16octets

Protocalcontents:

(Hex01010010810600000000830600000000

[1]:

ProtocolID:

(HexA

Contentslength:

0octets

Protocalcontents:

(Hex

Trackingareaidentity-LastvisitedregisteredTAI

ElementID:

82

MobileCountryCode(MCC:

(460China(People'sRepublicof

MobileNetworkCode(MNC:

(00ChinaMobile

Trackingareacode(TAC:

0x200

(5RRCConnectionRequest(建立一个RRC连接

RRC:

RRCConnectionRequest

Messagetype:

CCCH_UL

Direction:

Uplink

FrameNo:

675

SubframeNo:

9

ComputerTimestamp:

17:

23:

02.843

UL-CCCH-Message

message

c1

rrcConnectionRequest

criticalExtensions

rrcConnectionRequest-r8

ue-Identity(初始UE标识

randomValue:

0x397737492F

establishmentCause:

mo-Signalling(建立原因

spare:

0x00

(6RRCConnectionSetup(建立一个SRB1

RC:

RRCConnectionSetup

Messagetype:

CCCH_DL

Direction:

Downlink

FrameNo:

680

SubframeNo:

2

ComputerTimestamp:

17:

23:

02.953

DL-CCCH-Message

message

c1

rrcConnectionSetup

rrc-TransactionIdentifier:

0(RRC操作标识

criticalExtensions

c1

r

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