-
LTE
信令分析
一、
概述:
本文信令内容为
< br>2011
年
6
月杭州
LTE
实验网期间,采用
NSN
< br>的网络设备,数据卡终端
为创毅,测试软件使用
CDS<
/p>
吐出的信令内容。由于试验网期间网络、终端、测试软件都没
有完
全成熟,所以信令内容只局限于现有试验网阶段。
以下是终端
空闲态、
RRC
连接态做业务涉及到的所有信令内容。
从消息看主要是无线资
源控制层
RRC
消息和非接入层
NAS
消息。
< br>NAS
高层消息不再多做描述,主要对
RRC
层消息
做简单介绍。
RRC: RRCConnectionRequest
RRC: RRCConnectionSetup
NAS:
Attach Request
NAS: Authentication
Request
NAS: Authentication Response
NAS: Security Mode Command
NAS: Security Mode Complete
RRC: UECapabilityEnquiry
RRC: UECapabilityInformation
NAS: Attach Accept
RRC:
RRCConnectReconfigurationComplete
NAS:
Attach Complete
RRC:
RRCConnectionRelease
RRC:
MasterInformationBlock
RRC: Paging
RRC: MeasurementReport
二、
信令流程
1.
切换流程:
待补充
2.
重选信令流程
重选过程是
RRC
空闲状态下的流程,只有
2
条信令:
RRC:
RRCConnectionRe
quest
、
RRC:
Master
InformationBlock
。
如下图所示:
3.
FTP
信令流程:
待补充
三、
详细信令
1.
RRC
层信令内容
业务和功能
广播和
NAS
相关的系统消息
广播和
AS
相关的系统消息
寻呼
建立、维护和释放终端和
E-UTRAN
之间的
RRC
链接包括分配临时的终端标识,配置
信令承载
安全功能包括密钥的管理
建立、维护和释放点对点的无线承载
移动性管理功能,包括测量控制和上报、切换、小区选择和重选、切换时
RRC
上下文
传递
广播
MBMS
业务
建立、维护和释放
MBMS
无线承载
QoS
管理功能
终端测量控制和上报
上下行透明传递
NAS
消息
1)
RRC:
RRCConnectionRequest
Message type:
CCCH_UL
Direction: Uplink
Computer Timestamp: 14:57:41.890
uL-CCCH-Message
message
c1
rrcConnectionRequest
criticalExtensions
rrcConnectionRequest-r8
ue- Identity
randomValue:
1101
establishmentCause
: mo-
Signalling
spare : 0
5D DD DD DD DD D6
主要内容:终端身份、建立原因。
2)
RRC: RRCConnectionSetup
Message type: CCCH_DL
Direction: Downlink
Computer
Timestamp: 14:57:41.937
dL-CCCH-Message
message
c1
rrcConnectionSetup
rrc-TransactionIdentifier : 2
criticalExtensions
c1
rrcConnectionSetup-r8
radioResourceConfigDedicated
srb-ToAddModList
SRB
-ToAddMod
srb-Identity : 1
rlc-Config
explicitValue
am
ul-AM-RLC
t-PollRetransmit : ms100
RLC
控制参数:
pollPDU
t-PollRetransmit
、
、
pollPDU : pInfinity
pollByte
、
maxRetxThreshol
d
。
pollByte : kBinfinity
maxRetxThreshold : t16
dl-AM-RLC
t- Reordering : ms50
t-
StatusProhibit : ms0
logicalChannelConfig : defaultValue
mac-MainConfig
HARQ
重传、
MAC
层控制参数:
BSR
重发
定时器等。
物理层控制参数:
PDSCH;
PUSCH:ACKRICQI
;
上行功控;
CQI
控制参数;
SRS
参数;
天线信息:
transmissio
nMode
;
p>
。
。
。
。
。
explicitValue
ul-SCH-Config
maxHARQ-Tx : n4
periodicBSR
-Timer : infinity
retxBSR-Timer : sf2560
ttiBundling :
false
timeAlignmentTimerDedicated : sf10240
physicalConfigDedicated
pdsch
-ConfigDedicated
p-a : dB0
pusch
-ConfigDedicated
betaOffset-ACK-
Index : 10
betaOffset-RI-Index : 3
betaOffset-CQI-Index : 8
uplink
PowerContr
ol
Dedicated
p0-UE-PUSCH : 2
deltaMCS-Enabled : en0
accumulationEnabled : true
p0-UE-PUCCH : 2
pSRS-Offset : 7
filterCoefficient : fc4
cqi-Report
Config
cqi-ReportModeAperiodic :
rm30
nomPDSCH-
RS-EPRE-Offset : 0
cqi-ReportPeriodic
setup
cqi-PUCCH-ResourceIndex : 4
cqi-pmi-ConfigIndex : 8
cqi-
FormatIndicatorPeriodic : widebandCQI
simultaneousAckNackAndCQI : false
soundingRS
-UL-
ConfigDedicated
setup
srs-Bandwidth : bw0
srs-HoppingBandwidth : hbw0
freqDomainPosition : 0
duration : true
srs-ConfigIndex : 21
transmissionComb : 1
cyclicShift :
cs4
antenna
Info
explicitValue
transmissionMode :
tm2
ue-TransmitAntennaSelection
: release
schedulingRequestConfig
70 12 98 13 FD
94 04 99 F3 65
9F 28 E1 4D
3E CC 01 00 82 00
82 B8 14
10 06 C0
setup
sr-PUCCH-ResourceIndex : 32
sr-ConfigIndex : 13
dsr-TransMax : n64
主要内容:
RLC
层、
MAC
层、
PHY
层各种参数配置。
3)
RRC: UECapabilityEnquiry
Message type: DCCH_DL
Direction: Downlink
Computer
Timestamp: 14:57:42.296
dL-DCCH-Message
message
c1
ueCapabilityEnquiry
rrc-TransactionIdentifier : 2
criticalExtensions
c1
ueCapabilityEnquiry-r8
ue-
CapabilityRequest
: eutra
主要
内容:
UE
能力询问
4)
RRC:
UECapabilityInformation
Message type:
DCCH_UL
Direction: Uplink
Computer Timestamp: 14:57:42.296
uL-DCCH-Message
message
c1
ueCapabilityInformation
rrc-TransactionIdentifier : 2
criticalExtensions
c1
ueCapabilityInformation-r8
ue-
CapabilityRAT-ContainerList
UE-
CapabilityRAT-Containe
r
81000019d2810381d
3C 01 00 E8 10
00 01 9D 28 10
38 1D 18 34
42 00 00 00
rat-Type : eutra
ueCapabilityRAT-Container
:
主要内容:
UE
能力
< br>
5)
RRC: RRCConnectionReconfiguration
Message type: DCCH_DL
Direction: Downlink
Computer
Timestamp: 15:20:36.000
dL-DCCH-Message
message
c1
rrcConnectionReconfiguration
rrc-TransactionIdentifier : 1
criticalExtensions
c1
rrcConnectionReconfiguration-r8
measConfig
measObjectToAddModList
MeasObjectToAddMod
measObjectId : 1
measObject
下发
UE
需测量的信息:
measObjectEUTRA
频点、
carrierFreq
: 38050
频点带宽
allowedMeasBandwidth
:
mbw100
。
。
。
。
presenceAntennaPort1 : true
neighCellConfig : 00
offsetFreq : dB0
reportConfigToAddModList
ReportConfigToAddMod
reportConfigId : 1
reportConfig
reportConfigEUTRA
triggerType
event
eventId
eventA3
a3-Offset : 4
reportOnLeave :
false
sameAsTriggerQuantity
下发<
/p>
UE
需要上报的
控制参数:
A3A2A5
事件参数,
threshold-RSRP : 60
threshold-RSRP : 62
sameAsTriggerQuantity
hysteresis : 0
timeToTrigger : ms320
triggerQuantity
: rsrp
reportQuantity
maxReportCells : 8
reportInterval : ms1024
reportAmount :
infinity
ReportConfigToAddMod
reportConfigId : 2
reportConfig
reportConfigEUTRA
triggerType
event
eventId
eventA5
a5-Threshold1
a5-Threshold2
hysteresis : 0
timeToTrigger : ms480
triggerQuantity
: rsrp
reportQuantity
maxReportCells : 8
reportInterval : ms240
reportAmount :
infinity
ReportConfigToAddMod
reportConfigId : 3
reportConfig
reportConfigEUTRA
triggerType
event
eventId
eventA2
a2-Threshold
:
:
threshold-RSRP
: 1
sameAsTriggerQuantity
需要查看参考资料,
待补
充
移动性参数
hysteresis : 0
timeToTrigger :
ms256
triggerQuantity : rsrp
reportQuantity
:
maxReportCells : 8
reportInterval : min60
reportAmount : r1
measIdToAddModList
MeasIdToAddMod
measId : 1
measObjectId : 1
reportConfigId
: 1
MeasIdToAddMod
measId : 2
measObjectId :
1
reportConfigId : 2
MeasIdToAddMod
measId : 4
measObjectId : 1
reportConfigId
: 3
quantityConfig
quantityConfigEUTRA
filterCoefficientRSRP : fc4
filterCoefficientRSRQ : fc4
measGapConfig : release
s-Measure : 90
speedStatePars
setup
mobilityStateParameters
t-Evaluation : s180
t-HystNormal : s180
n-CellChangeMedium : 8
n-CellChangeHigh : 8
timeToTrigger-
SF
sf-Medium : oDot5
sf-
High : oDot5
radioResourceConfigDedicated
srb-ToAddModList
SRB-ToAddMod
srb-Identity : 2
rlc-Config
explicitValue
RLC
层
am
RRC
配
置
参数
SRB
参
ul-
AM-RLC
数
t-PollRetransmit : ms100
pollPDU : pInfinity
pollByte : kBinfinity
maxRetxThreshold : t16
dl-AM-RLC
t-Reordering : ms50
t-StatusProhibit : ms0
logicalChannelConfig : defaultValue
drb-ToAddModList
DRB-ToAddMod
eps-BearerIdentity : 5
drb-Identity : 4
pdcp-Config
discardTimer : ms300
rlc-AM
statusReportRequired : true
headerCompression : notUsed
rlc-Config
am
RLC
ul-
AM-RLC
层
t-PollRetransmit : ms250
DRB
pollPDU : p16
参
pollByte : kB25
maxRetxThreshold : t16
数
dl-
AM-RLC
t-Reordering : ms50
t-StatusProhibit : ms50
logicalChannelIdentity : 4
logicalChannelConfig
ul-SpecificParameters
priority : 10
prioritisedBitRate : kBps16
bucketSizeDuration : ms100
logicalChannelGroup : 2
mac-MainConfig
explicitValue
ul-
SCH-Config
periodicBSR-Timer : sf10
retxBSR-Timer : sf320
ttiBundling :
false
timeAlignmentTimerDedicated : sf10240
phr-Config
MAC
层参数
setup
periodicPHR-
Timer : sf200
prohibitPHR-Timer : sf100
dl-PathlossChange : dB6
physicalConfigDedicated
cqi-ReportConfig
cqi-ReportModeAperiodic :
rm30
nomPDSCH-RS-EPRE-Offset : 0
cqi-ReportPeriodic
setup
RRC
cqi-PUCCH-ResourceIndex : 3
cqi-pmi-ConfigIndex : 9
配
置
cqi-
FormatIndicatorPeriodic
widebandCQI
参数
simultaneousAckNackAndCQI : true
物理层
soundingRS-UL-ConfigDedicated
setup
层参数
srs-Bandwidth : bw0
srs-HoppingBandwidth : hbw0
freqDomainPosition : 0
duration : true
srs-ConfigIndex : 15
transmissionComb : 1
cyclicShift :
cs7
antennaInfo
explicitValue
transmissionMode : tm2
ue-
TransmitAntennaSelection : release
6)
RRC:
RRCConnectReconfigurationComplete
Message type: DCCH_UL
Direction: Uplink
Computer
Timestamp: 14:57:42.406
uL-DCCH-Message
message
c1
rrcConnectionReconfigurationComplete
:
rrc-TransactionIdentifier :
1
criticalExtensions :
rrcConnectionReconfigurationComplete-r8
12
00
主要内容:
RRC
重配消息确认
。
7)
RRC:
RRCConnectionRelease
Message type:
DCCH_DL
Direction: Downlink
Computer Timestamp: 14:58:12.546
dL-DCCH-Message
message
c1
rrcConnectionRelease
rrc-TransactionIdentifier : 3
criticalExtensions
c1
rrcConnectionRelease-r8
releaseCause :
other
主要内容:
RRC
释放消
息
8)
RRC:
MasterInformationBlock
Message type:
BCCH_BCH
Direction: Downlink
Computer Timestamp: 14:58:12.890
bCCH-BCH-Message
message
dl-Bandwidth : n6
______
a)
下行系统带宽【
4
比特】
phich-Config
_________b) PHICH
资源指示【
3
比特】
phich-Duration : normal
phich-Resource : oneSixth
systemFrameNumber :
11101011_________
2)
系统帧号
spare : 1010100111
03 AE A7
AC 00 DE
【
MIB
,约
31
比特】,在
PBCH
上传输,携带下列信息:
1)
物理层参数:
a)
下行系统带宽【
4
比特】
b) PHICH
资源指示【
3
比特】
2)
系统帧号(
SFN
【
8
比特】,除非通过另外的方式提供)
3) CRC
【
16
比特】
SIB
系统信息在
DL-SCH
上传输。按照调度要求(例如:周期)的不同,这些信息又分
在若干个
SI
上传输,系统最少支持
4
个
SI
(即
SI-1
、<
/p>
SI-2
、
SI-3
、
SI-4
),
SI
的信息不做
“
分
段
”
,但可能使用重传机制,最大
TB
大小约为
1200bit
< br>。
9)
RRC: Paging
Message type:
PCCH
Direction: Downlink
Computer Timestamp: 15:07:24.234
pCCH-Message
message
c1
paging
pagingRecordList
PagingRecord
ue-Identity
s-TMSI
mmec : 00000001
m-TMSI :
11101100
cn-
Domain : ps
主要内容:
TMSI Domain
10)
RRC:
MeasurementReport
Message type: DCCH_UL
Direction: Uplink
Computer
Timestamp: 15:11:32.781
uL-DCCH-Message
message
c1
measurementReport
criticalExtensions
c1
measurementReport-r8
measResults
measId : 1
measResultServCell
rsrpResult : 41
rsrqResult : 26
measResultNeighCells
measResultListEUTRA
MeasResultEUTRA
physCellId : 37
measResult
rsrpResult : 44
主要内容:切换上报
2.
NAS
层信令内容
1)
NAS: Attach
Request
Message type: EPS MM
Direction: Uplink
Computer
Timestamp: 14:57:41.937
uL-DCCH-Message
message
c1
rrcConnectionSetupComplete
rrc-TransactionIdentifier : 2
criticalExtensions
c1
rrcConnectionSetupComplete-r8
selectedPLMN-Identity : 1
dedicatedInfoNAS
:
85e0ed0201d116000000
00000a00
Attach Request
Security header type: (0) Plain NAS
message, not security protected
protocol_discriminator :
EPS Mobility Management
NAS
EPS Mobility Management Message Type : (0x41)
Attach request
Type of security context flag (TSC):
(0) Native security context
NAS key set identifier: (7)
No key is available
Spare
bit(s): 0
EPS
attach type: (1) EPS attach
EPS mobile identity - Old
GUTI or IMSI
Length : 8 octets
odd/even indic: 1
Type of
identity: (1) IMSI
IMSI: 463
UE network capability
Length : 5 octets
EEA0: (1)
Support
128-EEA1: (1) Support
128-EEA2: (1) Support
EEA3: (0) Not
support
EEA4:
(0) Not support
EEA5: (0) Not support
EEA6: (0) Not support
EEA7: (0) Not
support
EIA0:
(1) Support
128-EIA1: (1) Support
128-EIA2: (1) Support
EIA3: (0) Not
support
EIA4:
(0) Not support
EIA5: (0) Not support
EIA6: (0) Not support
EIA7: (0) Not
support
UEA0:
(0) Not support
UEA1: (0) Not support
UEA2: (0) Not support
UEA3: (0) Not
support
UEA4:
(0) Not support
UEA5: (0) Not support
UEA6: (0) Not support
UEA7: (0) Not
support
UCS2
support (UCS2): (0) Not support
UMTS integrity algorithm
UIA1: (0) Not support
UMTS integrity algorithm UIA2: (0) Not
support
UMTS
integrity algorithm UIA3: (0) Not support
UMTS integrity
algorithm UIA4: (0) Not support
UMTS integrity algorithm
UIA5: (0) Not support
UMTS integrity algorithm UIA6: (0) Not
support
UMTS
integrity algorithm UIA7: (0) Not support
1xSRVCC
capability: (0) SRVCC from E-UTRAN to cdma2000
1xCS Not supported
ESM message container
Length : 29
octets
ESM
message container contents: 2 1 d0 11 27 17 80 80
21 10 1 0 0 10 81 6 0 0 0 0 83 6
0 0 0
0 0 a 0
0000 .... = EPS bearer
identity : 0
.... 0010 = protocol_discriminator :
(2) EPS session management messages
Procedure transaction identity : 1
NAS
EPS session management messages : (0xd0) PDN
connectivity request
PDN type: (1)
IPv4
Request type: (1) Initial
attach
Protocol Configuration
Options
-
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