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LTE/GSM
CSFB技術(shù)研討廣州2013-03-12移動(dòng)通信
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內(nèi)容CSFB
簡(jiǎn)介EPC/LTE簡(jiǎn)介CSFB關(guān)鍵信令/流程CSFB
KPICSFB性能優(yōu)化移動(dòng)通信
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–話音回落多種方案R8重定向R9重定向（帶系統(tǒng)消息）PSHO優(yōu)化用戶體驗(yàn)Fast
Return
or
Fast
Re-direct移動(dòng)通信
全球多數(shù)LTE運(yùn)營(yíng)商采用的方案m
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CSFB性能比較優(yōu)化后的CSFB性能已接近2G/3G語(yǔ)音呼叫移動(dòng)通信
通信人才網(wǎng)
內(nèi)容CSFB
簡(jiǎn)介EPC/LTE簡(jiǎn)介CSFB關(guān)鍵信令/流程CSFB
KPICSFB性能優(yōu)化移動(dòng)通信
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縮略語(yǔ)CSFB：Circuit
Switch
Fall-Back
for
Voice,
即:LTE語(yǔ)音業(yè)務(wù)回落到電路域完成MO：Mobile
Originating
Call，即：起呼方、主叫MT：MobileTerminating
Call，即：被叫方、被叫Reselection：小區(qū)重選HO：切換Redirection：重定向RAT：Radio
Access
Technology，3GPP的無(wú)線接入技術(shù)IRAT：inter
RAT，通常指3GPP接入技術(shù)間的互操作，例如2/3G和LTE的互操作移動(dòng)通信
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LTE
+
EPC移動(dòng)通信m
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LTE系統(tǒng)節(jié)點(diǎn)移動(dòng)通信m
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移動(dòng)通信
基于Gn/Gp的PS域2/3G+4G互操作SGiGnGnS1-MMEPCRFGxS6aHSSS10UEGERANUTRANGn/GpSGSNE-UTRANMMES11S5SGWPGWOperator's
IP
Services(e.g.
IMS,
PSS
etc.)RxGrS1uIP連接通過(guò)Gn/Gp接口的4G與2/3G互操作原理上是MME/PGW對(duì)SGSN仿真SGSN/GGSN。好處是可以減少對(duì)2/3G
GPRS
網(wǎng)的升級(jí)改造。m
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CSFB系統(tǒng)構(gòu)架EPS
architecturefor
CS
fallback
over
SGsUEE-UTRANMMELTE-UuS1-MMEGERANUTRANUmUuSGSNMSCServerSGsGsAGbIu-psS3/Gn
Iu-cs移動(dòng)通信m
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協(xié)議棧–控制面移動(dòng)通信m
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協(xié)議棧–用戶面移動(dòng)通信m
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PDN
connectionData
BearerSRB0Data
BearerSRB
1SRB
2CCCH:
RRC
connection
request/setupDCCH:L1/L2
and
measurement
configurationPaggyback
NASNAS移動(dòng)通信
承載的邏輯：Radio
Bearer–終端側(cè)用戶面mPrivilegeandCon通fide信nt人ial才網(wǎng)
控制面RRC
(UE/eNB/MME)ConnectedidleLTE
UE
移動(dòng)性管理和主要狀態(tài)機(jī)EMM
(UE/MME)RegisteredDeregisteredESM(UE/MME)–
Always
onGPRS
PDP
context(UE/SGSN)ActivatedDeactivated小區(qū)重選小區(qū)切換移動(dòng)通信
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移動(dòng)尋通信呼論區(qū)壇
域www.：區(qū)、位置區(qū)和路由區(qū)LTE
–
tracking
areaTAI=PLMN
id
+
TACGSM
–
Location
areaLAI
=
PLMN
id+LACGPRS
–
Routing
areaRAI
=
PLMN
id+LAC+RACm
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UE
IDSGSNP-TMSIMSCTMSI2/3G
CorePGW:IP
addressMME:
M-TMSISGSN:
P-TMSIMSC:
TMSI移動(dòng)通信m
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LTE基本消息和信令RRC
-
Radio
Resource
Control系統(tǒng)消息SI本小區(qū)信息，鄰區(qū)信息。LTE用于空閑態(tài)移動(dòng)管理。GSM移動(dòng)管理：在空閑態(tài)BCCH，連接態(tài)在SACCH無(wú)線資源連接建立、無(wú)線層L1/L2的配置無(wú)線測(cè)量管理NAS
–
Non
Access
Stratum
Signaling移動(dòng)管理MM網(wǎng)絡(luò)附著Attach、Detach區(qū)更新TAU會(huì)話管理SM承載Bear建立，修改和移動(dòng)通信m
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系統(tǒng)廣播消息LTESIB1,小區(qū)識(shí)別信息SIB2,本小區(qū)接入信息SIB3,小區(qū)重選設(shè)定SIB4,同頻4G鄰區(qū)信息SIB5,異頻4G鄰區(qū)信息SIB6,TDS鄰區(qū)信息SIB7,GSM鄰區(qū)信息。。。GSMSIB1本小區(qū)頻點(diǎn)…SIB2鄰區(qū)頻點(diǎn)…SIB2bis鄰區(qū)擴(kuò)展的BCCH…SIB2ter,跨band鄰區(qū)…SIB2Q,3/4G鄰區(qū)...SIB3,小區(qū)識(shí)別信息LAC/CI,小區(qū)選擇控制，接入信息…SIB4,LAC,本小區(qū)選擇控制…SIB5,鄰區(qū)頻點(diǎn)…SIB5Bis,鄰區(qū)跨擴(kuò)展BCCH…SIB5ter,鄰區(qū)跨band頻點(diǎn)…SIB6,本小區(qū)識(shí)別信息LAC、CI…SIB13,本小區(qū)GPRS接入信息…移動(dòng)通信
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移動(dòng)通信
GSM
SIB1：本小區(qū)頻點(diǎn)??????????SYSTEM_INFORMATION_1cell_chan_desc
format_id
=
2
(0x2)
format_id_2
=
1
(0x1)
format_id_3
=
3
(0x3)
ccd_format
var_bit_map=
621
(0x26d)
1
7
=
42
(0x2a)
('0101010'b)
8
15
=33
(0x21)
('00100001'b)?1623
=0
(0x0)
('00000000'b)?2431
=
0
(0x0)
('00000000'b)?3239
=
0
(0x0)
('00000000'b)?4047
=
0
(0x0)
('00000000'b)?4855
=
0
(0x0)
('00000000'b)?5663
=
0
(0x0)
('00000000'b)?6471
=
0
(0x0)
('00000000'b)?7279
=
0
(0x0)
('00000000'b)?8087
=
0
(0x0)
('00000000'b)?8895
=
0
(0x0)
('00000000'b)?96_103
=
0
(0x0)
('00000000'b)?????????????_104_111
=
0
(0x0)
('00000000'b)rach_ctrl_params
max_retrans=
2(0x2)
tx_int
=
14
(0xe)
cell_barr_access
=0
(0x0)
re
=
1
(0x1)ac
=
0
(0x0)
si_1_restpadding_bits_L
=0
(L)
Band
indicatorBAND_INDICATOR_L
=
0(L)spare_padding0_count
=6(0x6)
spare_padding0
=
0
(0x0)?m
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移動(dòng)通信
GSM
SIB3：LAC/ID,接入信道chan_type
=
1
(0x1)
l2_pseudo_len=
18
(0x12)
trans_id_or_skip_ind
=
0
(0x0)prot_disc
=
6
(0x6)
(GSM_RR_MANAGEMENT)
msg_type
=
27
(0x1b)prot
rr_man_protSYSTEM_INFORMATION_3cell_identcell_ident_val
=
19617
(0x4ca1)
loc_area_identmcc_1
=
4
(0x4)
mcc_2
=
6
(0x6)
mcc_3
=
0
(0x0)
mnc_3
=
15
(0xf)
mnc_1
=
0
(0x0)
mnc_2
=
0
(0x0)loc_area_code
=
22457
(0x57b9)
control_chan_descmscr
=
1
(0x1)
att
=
1
(0x1)bs_ag_blks_res
=
2
(0x2)
ccch_conf
=
2
(0x2)
cbq3
=
0
(0x0)
bs_pa_mfrms
=
0
(0x0)t_3212_timeout=
20(0x14)cell_options
pwrc
=
1
(0x1)
dtx
=
1
(0x1)radio_link_timeout
=7(0x7)
cell_sel_params
cell_reselect_hys
=
5(0x5)
ms_txpwr_max_cch
=
5
(0x5)
acs
=
0
(0x0)neci
=
1
(0x1)
rxlev_access_min
=
10
(0xa)
rach_ctrl_params
max_retrans
=
2
(0x2)
tx_int
=
12
(0xc)
cell_barr_access
=
0
(0x0)
re
=
1
(0x1)ac
=
0
(0x0)
si_3_rest??????????????????????????????????????????????Optional
Selection
Parameters
padding_bits_H
=
1
(H)
Selection
ParametersmPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)通信
GSM
SIB
2Quater：3/4G鄰區(qū)??????????????????????????????????????????…SYSTEM_INFORMATION_2QUATERsi_2quater_rest…SI2quater_INDEX
=
3
(0x3)
SI2quater_COUNT
=
3
(0x3)……e_utran_measurement_parameters_description_present
=
0
(0x0)
gprs_e_utran_measurement_parameters_description_present
=
0
(0x0)
struct0_count
=
1
(0x1)struct0[0]
const_1=
1(0x1)Repeated
E-UTRAN
Neighbour
Cells
struct0_count
=
2
(0x2)struct0[0]
const_1
=
1
(0x1)=38000
(0x9470)measurement_bandwidth_present
=
0
(0x0)
struct0[1]const_1
=
1
(0x1)=38950
(0x9826)measurement_bandwidth_present
=
0
(0x0)const_0=
0
(0x0)
e_utran_priority_present
=
1
(0x1)
E-UTRAN_PRIORITY
=
7
(0x7)
THRESH_E-UTRAN_high
=
10
(0xa)thresh_e_utran_low_present
=
1
(0x1)
THRESH_E-UTRAN_low=
20
(0x14)e_utran_qrxlevmin_present
=
1
(0x1)
E-UTRAN_QRXLEVMIN
=
5
(0x5)const_0=
0
(0x0)
struct1_count
=
0
(0x0)
const_0=
0
(0x0)
struct2_count
=
0
(0x0)
const_0=
0
(0x0)_3g_csg_description_present
=
0
(0x0)
e_utran_csg_description_present
=
0
(0x0)
padding_bits_L
=0
(L)
spare_padding0_count
=56
(0x38)
spare_padding0
=0x00000000000002595Mhz2330Mhzm
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移動(dòng)通信
RRC：配置UE-eNB接入?yún)f(xié)議m
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RRC建立SRB0SRB1MSG3MSG4e.g.
NAS:Attach
or
MO
CSFBTM,
SR
config,
SRB
config.RRC
Security
Mode
CommandRRC
Security
Mode
Command
completeSRB
2移動(dòng)通信m
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連接建立的業(yè)務(wù)觸發(fā)“Service”->UERespond
to
a
pageCS
page
CSFB
MTPSpageDL
dataNetwork
initiated
NAS
msg- UEinitiated
NAS
msgESR:
CSFB
MOTAUAttach/Detach
…SR-
…rrcConnection…SRB2:
NASDRB:data移動(dòng)通信m
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RRC：承載控制信令UE->eNB:
RRC
connection
request由業(yè)務(wù)觸發(fā)，例如ESR或SRRRC
connection
setup配置SRB1,MAC和物理層RRC
connection
completePiggyback
NAS：
Atta O
CSFB
etc…RRCConnectionReconfiguration配置SRB2和DRBSRB2用來(lái)直傳NAS消息DL/UL
Information
Transfer移動(dòng)通信
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移動(dòng)通信RRwCw全w.部h信ro令pt(S.pceocm36.331)DLSRB0CCCHTMRRCConnectionRejectDLSRB1DCCHAMRRCConnectionReleaseULSRB0CCCHTMRRCConnectionRequestDLSRB0CCCHTMRRCConnectionSetupULSRB1DCCHAMRRC
pleteDLSRB1/2DCCHAMDLInformationTransferULSRB1/2DCCHAMULInformationTransferDLSRB1DCCHAMUECapabilityEnquiryULSRB1DCCHAMUECapabilityInformationDL_PCCHTMPagingDLSRB1DCCHAMmandULSRB1DCCHAMpleteULSRB1DCCHAMSecurityModeFailureDLSRB1DCCHAMRRCConnectionReconfigurationULSRB1DCCHAMRRCConnectionpletem
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DLULDLULSRB0SRB0CCCHCCCHTMTMRRCConnectionReestablishmentRejectRRCConnectionReestablishmentRequestDL_BCCHTMSystemInformationDL_BCCHTMSystemInformationBlockType1DL_BCCHTMMasterInformationBlockDLSRB1DCCHAMCounterCheckULSRB1DCCHAMCounterCheckResponseULSRB1DCCHAMMeasurementReportDLSRB1DCCHAMMo
mandULSRB1DCCHAMCSFBParametersReq
DMA2000DLSRB1DCCHAMCSFBParametersResponseCDMA2000ULSRB1DCCHAMULHandoverPreparationTransfer
(CDMA2000)DLSRB1DCCHAMHandoverFromEUTRAPreparationRequestSRB0SRB1CCCHDCCHTMAMRRCConnectionReestablishmentRRCConnectionplete(CDMA2000)移動(dòng)通信RRwCw全w.部h信ro令pt(S.pceocm36.331)m
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NAS消息EPS–
移動(dòng)性管理Attach/detachTAUAuthenticationIdentity
requestSecurity
mode–
移動(dòng)連接管理Service
requestPagingNAS
transport
(SMS)–
會(huì)話管理PDN
connectionEPS
bearer
act/deact/modif.GSM/GPRS–
移動(dòng)性管理通用AuthenticationIdentity
requestSecurity
modeCS:LAUAttach/detachCall
ControlPS:GMMRAUGMM
attach/detach–
PS會(huì)話管理PDP
contextactivate/deactivatPDP
context
modification移動(dòng)通信m
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DLULDLULAttach
acceptAttach
completeAttach
rejectAttach
requestULDLDLULDLULAuthentication
failureAuthentication
rejectAuthentication
requestAuthentication
responseIdentity
requestIdentity
responseDLULULBHSecurity
mode
commandSecurity
mode
completeSecurity
mode
rejectSecurity
protected
NAS
messageDLULDownlink
NAS
TransportUplink
NASTransportDLULDLULTracking
area
update
acceptTracking
area
update
completeTracking
area
update
rejectTracking
area
update
requestDLULULServicerejectServicerequestExtended
service
requestDLULDetach
acceptDetach
requestDLCS
service
notificationDLULEMM
informationEMM
statusDLULGUTI
reallocation
commandGUTI
reallocation
complete移動(dòng)通信論N壇AS
EPwS
wMwM.h全ro部p信t.令co(Smpec
24.301)DLPDN
connectivity
rejectDLPDN
disconnect
rejectULPDN
connectivity
requestULPDN
disconnect
requestULULDLULULDLULULDLActivate
dedicated
EPS
bearercontext
acceptActivate
dedicated
EPS
bearer
context
rejectActivate
dedicated
EPS
bearercontext
requestActivate
default
EPS
bearer
context
acceptActivate
default
EPS
bearercontext
rejectActivate
default
EPS
bearer
context
requestModify
EPS
bearer
context
acceptModify
EPS
bearer
context
rejectModify
EPS
bearer
context
requestULDLDeactivate
EPS
bearer
context
acceptDeactivate
EPS
bearer
context
requestDLULDLULBearer
resource
allocation
rejectBearer
resource
allocation
requestBearerresource
modification
rejectBearerresource
modification
requestDLULDLESM
informationrequestESM
informationresESM
statusmPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)通信NA(Spec
24.301)內(nèi)容CSFB
簡(jiǎn)介EPC/LTE簡(jiǎn)介CSFB關(guān)鍵信令/流程CSFB
KPICSFB性能優(yōu)化移動(dòng)通信
m
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CSFB信令流程-1聯(lián)合CSFB主叫流程回歸LTE重選重定向移動(dòng)通信
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聯(lián)合移動(dòng)通信m
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移動(dòng)通信
CSFB
–
Combined
AttachMME
to
figure
out
a
VLRfor
CS
service,
the
MSC/VLRcreate
SG
interface
to
MME1.
Attach
RequestDerive
VLR
numberLocation
Update
RequestCreate
SGs
association7.
Location
UpdateAcceptUEMMEHSSMSC/VLR2.
Step
3
to
step
16
of
the
Attach
procedure
specified
in
TS
23.4016.
Location
update
in
CS8.
Step
17
to
step
26
of
the
Attach
procedure
specified
in
TS
23.401m
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m
Privilegeand1.
Attach
RequestOld
ME/SGSNServing
GWPCRFHSS3.
Identification
RequestPDN
GW2.
AttachRequest3.
Identification
Response4.
Identity
Request4.
Identity
Response5a.
Authentication
/
SecurityUplink
Data23
Modify
Bearer
Request(B)(A)9.
Cancel
Location9.
Cancel
Location
Ack10.
Delete
Session
Request10.
Delete
Session
Response7.
Delete
Sesion
Request7.
Delete
Session
Response8.
Upda ocation
RequestEIR5b.
ME
Identity
Check5b.
Identity
Request/Response10.
PCEF
Initiated
IP-CAN
Session
Termination7.
PCEF
Initiated
IP-CAN
Session
Termination11.
Updaocation
AckCreate
Session
RequestCreate
Session
RequestPCEF
Initiated
IP-CAN
Session
Establishment/Modification(C)Create
Session
ResponseDownlink
Data
(if
not
handover)Create
Session
ResponseInitial
Context
Setup
Request
/
Attach
AcceptRRC
Connection
ReconfigurationRRC
Connection
Reconfiguration
CompleteInitial
Context
Setup
Response6.
Ciphered
Options
Request6.
Ciphered
Options
Response21.
Direct
Transfer22(E)(F)移動(dòng)通信EU才網(wǎng)聯(lián)合Attach
RequestAttach
type=2，聯(lián)合UE
id：GUTI或P-TMSI…esm_msg_container：PDN
connectivity
request
voice_
_pref_for_EUTRAN
=
2
(0x2)
(CSVoice
preferred,
IMS
PS
Voice
as
secondary)UE_usage_setting
=
0
(0x0)
(Voice
centric)移動(dòng)通信
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聯(lián)合
被接受Attach
Acceptattach_result
=
2
(0x2)
(comb
EPS/IMSI
attach)t3412
（TAU周期）tai_listloc_area_idms-idgutiesm_msg_container：
msg_type
=
193
(0xc1)
(Activate
defaultEPS
bearer
context
request)qci
=
8
(0x8)
(QC8)access_pointpdn_addrQos移動(dòng)通信
m
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Con通fide信nt人ial
才網(wǎng)
移動(dòng)通信
CSFB
–
MO
call
flow,
connected
modeUE/MSMMEBSS/RNSMSCeNodeB10b.
Location
Area
Update10a.
Service
RejectSGW/PGW4
S1-AP:
S1
UE
Context
Release
Request1a.
NAS
Extended
Service
Request1b.
S1-AP
UE
Context
Modification
Request
with
CS
Fallback
indicatorSGSN11.
Routing
Area
Update
or
Combined
RA/LA
UpdateIf
the
MSCis
changed10c.
CS
MO
call9.
CM
Service
Request9.
A/Iu-cs
message
(with
CM
Service
Request)ESR
with
CSFB
indication1c.
S1-AP
UE
Context
Modification
Response
message2.
Optional
Measurement
Report
Solicitation3a.
NACC, .
3b,
3c
RRC
connection
releaseMME
ask
UE
to
tune
away
to
2G/3G5.
S1
UE
Context
Release6.
UE
changes
RAT
then
LA
Update
or
RA
Update
or
LAU
and
RAU7a.
Suspend
(see
23.060)7b.
Suspend
Request
/
Response8.
Update
bearer(s)UE
access
2G/3G
for
CS
callm
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才網(wǎng)
g可以省100~200ms連接態(tài)移動(dòng)通信
通信人才網(wǎng)
移動(dòng)R通R信C論重壇RRC
release
with
Redirection{10,631,632,633,634,635,636,637,638,639,640}}}}value
DL-DC
essage
::={message
c1
:
rrcConnectionRelease
:{rrc-TransactionIdentifier
3,criticalExtensions
c1:
rrcConnectionRelease-r8
:{releaseCause
other,redirectedCarrierInfo
geran
:{8,bandIndicator
dcs1800,s
ex s
:?????????????????}mPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)通信
R9
RRC
release
with
SI
tunnelingvalue
DL-DC essage
::={message
c1
:
rrcConnectionRelease
:{rrc-TransactionIdentifier
0,criticalExtensions
c1
:
rrcConnectionRelease-r8
:{releaseCause
other,
redirectedCarrierInfo
geran
:{0,bandIndicator
dcs1800,s
ex s
:{560,70}},nonCriticalExtension{nonCriticalExtension{cellInfoList-r9
geran-r9
:{{physCellId-r9{networkColourCode
'010'B,
baseStationColourCode
'000'B},carrierFreq-r9{70,bandIndicator
dcs1800},systemInformation-r9{'
0000000000000100B100002B'H,
'1B4D6864F0005814D2001457A54DB100008000B053'H,
'00E0005878654A92A53B2942DB2B2B2B2B2B2B2B2B'H}},{physCellId-r9{networkColourCode
'011'B,
baseStationColourCode
'001'B???????????????????????????????????????????????mPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)E通xa信
plewwwlo.hgro(idle)
R8
redirection
+
MOCSFB_R8_MO_FR_idle_with_attachm
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CSFB信令流程-2CSFB被叫流程TAU
區(qū)更新移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
IF
THEMSC
ISCHANGEDUE/MSMMEMSC9c.
Location
Area
Update
or
Combined
RA/LA
UpdateS-GW/PGWect9b.Signalling
Connection
Release
9b.
CONNECTION
REJECT1A.
CS
SERVICE
NOTIFICATION1A.
PAGING
REQUESTSGSNeNodeB
BSS/RNS3a.
CCO/NACC, 3b,
3c.Signalling
connection
release4.
S1-AP:
S1
UE
CONTEXT
RELEASE
REQUEST1A.
SERVICE
R1b.
NAS
Extended
Service
Request
1c.
CS
Paging
RejEQUEST1d.
S1-AP
UE
Context
Modification
Request
with
CS
Fallback
indicator1e.
S1-AP
UE
Context
Modification
Response
message2.
Optional
Measurement
ReportS1
UE
CONTEXT
RELEASEUE
changes
RAT
then,
LAU
OR
RA
UPDATE
OR
LAU
ANDRAU7a.
Suspend
(see
TS
23.060)7b.
Suspend
Request
/
ResponseUpdate
bearer(s)Paging
Response9a.Establish
CS
connection移動(dòng)通信
CSFB
MT
call
flow
-
connected
modePaging
request
from
MSC
viaMMEMME
ask
UE
to
tune
away
to2G/3GUE
access
2G/3G
for
CS
callm
Privilegeand
Con通fide信nt人ial
才網(wǎng)移動(dòng)通信
Fast
Return
–
RR
channel
releaseIEIInformation
elementType
/
ReferencePresenceFormatlengthRR
managementProtocol
DiscriminatorProtocol
Discriminator10.2MV1/2Skip
IndicatorSkip
Indicator10.3.1MV1/2Channel
ReleaseMessage
TypeMessage
Type10.4MV1RR
CauseRR
Cause1MV173BA
RangeBA
RangeaOTLV6
-
?74Group
Channel
DescriptionGroup
Channel
Description4bO
(note
1)TLV5-138xGroup
Cipher
Key
NumberGroup
Cipher
Key
Number0CTV1CxGPRS
ResumptionGPRS
Resumption4cOTV175BAList
PrefBAList
PrefcOTLV3-?76UTRAN
Freq
ListUTRAN
Freq
ListdOTLV3-?62Cell
Channel
DescriptionCell
Channel
DescriptionbOTV1777Cell
selection
indicator
afterrelease
of
all
TCH
and
SDCCHCell
selection
indicator
afterrelease
of
all
TCH
and
SDCCH
eOTLV4
-
?AxEnhanced
DTM
CS
ReleaseIndicationEnhanced
DTM
CS
ReleaseIndication
4eOTV104VGCS
Ciphering
ParametersVGCS
Ciphering
Parameters2bOTLV3-1578Group
Channel
Description
2Group
Channel
Description
24fO
(note
1)TLV1379Talker
IdentityTalker
Identity5OTLV3-207ATalker
Priority
StatusTalker
Priority
Status4
通信O
人才T網(wǎng)LV
ww3
w.it7BVGCSAMR
ConfigurationVGCSAMR
ConfigurationOTLV32012
Dec
15
05:25:42.173
[00]
0x512F
GSM
RR
Signaling
Message
--Channel
Release…protrr_man_protCHANNEL_RELEASE…cell_select_ind_incl
=
1
(0x1)cell_select_indlength_of_cell_selection_indicator
=
3
(0x3)const_011
=
3
(0x3)struct3_count
=
1
(0x1)struct3[0]const_1
=
1
(0x1)E-UTRAN
Description=
39250(0x9952)measurement_bandwidth_present
=
0
(0x0)not_allowed_cells_present
=
0
(0x0)_pcid_present
=
0
(0x0)…mPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)通信
mPrivilegeandCon通fide信nt人ial才網(wǎng)
移動(dòng)通信
CSFB
–
MT
call
flow
-
idle
mode…TAU流程IRAT基于Gn/Gp24.301,D.3.62.
Tracking
Area
Update
Request3.
Tracking
Area
Update
RequestRNCBSC11.
PCEF
I
atedIP-CANSession
Mod
fication5.
SGSN
Context
Response4.
SGSNContext
RequestGn/GpServingOldPDNMMESGSNGWMMEGWPCRFHSSSecurity
proceduresSGSN
Context
AcknowledgeC1Create
Session
RequestModify
Bearer
Request
(A)1.
Trigger
to
startTAU
procedure移動(dòng)通信meNodeBModify
Bearer
ResponseCreate
Session
ResponseUpda ocation
RequestCancel
LocationCancel
LocationAckCancel
LocationIu
Release
CommandIu
Release
CompleteCancel
Location
AckUpda
ocation
AckTracking
Area
Update
AcceptTracking
Area
Update
CompleteProcedure
as
in通TS
23信.401,s人teps2才to7
o網(wǎng)f
Figurew5.4(A)UEeNodeBMMEServing
GWPDN
GWPCRFHSS5.
Update
Bearer
Request6.
Procedure
as
in
TS
23.401,
steps
3
to
10
ofFigure
-1
or
steps
3
to
8
of
Figure
5.4.3-17.
Update
Bearer2b.
Modify
Bearer
Command3.
Modify
Bearer
Command4.
PCEF
Initiated
IP
-CANSession
Modifica
tion(B)Response8.
Provision
Ack.
2a.
UE
Ctxt
Update1.
Insert
Subscriberdata1a.
Insert
Subscriber
data
Ack
Figure
-1:
HSS
Initiated
Subscribed
QoS
Modification移動(dòng)通信m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
(A)MMEServing
GWPDN
GWPCRFeNodeBUE(B)Modification1.
IP-CAN
SessionModificationUpdate
Bearer
RequestUpdate
Bearer
RequestDownlink
NAS
TransportDirect
TransferDirect
TransferUplink
NAS
TransportUpdate
Bearer
Response9.
Update
Bearer
Response10.
IP-CAN
SessionFigure
5.4.3-1:
Bearer
Modification
Procedure
without
Bearer
QoS
Update移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
(B)MMEServing
GWPDNGWPCRF11.
Update
Bearer
resUEeNodeB(A)1.
IP-CANSessionModificationionponse12.
IP-CAN
SessModificationUpdate
Bearer
requestUpdate
Bearer
RequestBearer
Modify
Request/Session
Management
RequestRRC
Connection
ReconfigurationRRCConnection
Reconfiguration
CompleteBearer
Modify
ResponseDirect
TransferSession
Management
ResponseUpdate
Bearer
ResponseFigure
-1:
Bearer
Modification
Procedure
with
Bearer
QoS
Update移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
移動(dòng)通信
通信人才網(wǎng)
移動(dòng)E通xa信
plewwwlo.hgro(idle)
MT
R8
redirection
+
FRm
Privilegeand
Con通fide信nt人ial
才網(wǎng)
小結(jié)移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
R8
redirection和R9
redirection的比較R8
redirection只攜帶目標(biāo)GSM頻點(diǎn)UE需要在指定頻率集上選擇頻點(diǎn)，并要花時(shí)間讀SIB信息R8
redirection攜帶目標(biāo)GSM頻點(diǎn)和所在頻點(diǎn)的小區(qū)列表+相應(yīng)接入必備的系統(tǒng)消息UE只需要在指定頻率集上選擇小區(qū)，不需要花時(shí)間讀SIB消息，平均可節(jié)省可達(dá)2秒。移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
MO和MT的CSFB比較MOUE發(fā)起ESR
CSFB
MO在GSM發(fā)起CMService
RequestMTLTE將來(lái)自MSC的尋呼轉(zhuǎn)給UE空閑態(tài)：PCCH:pagingCS
indicator連接態(tài)：CS
ServiceNotificationUE響應(yīng)ESR
CSFB
MT在GSM響應(yīng)PagingResponse
而不是CMSR移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
同LA和跨LA的比較同LAUE在GSM發(fā)起CMService
Request或Paging
response不需要做LAU。通話結(jié)束后如未激活FR，先后發(fā)起LAU和RAU。跨LAUE在GSM發(fā)起CM
ServiceRequest或Paging
response時(shí)需要事先做LAUUE在此LAU中標(biāo)記Follow-On-Request（MO）或CSMT（MT）以保證LAU完成后NAS連接保持順便做后續(xù)的CM_SR或PagingResponse。如果跨MSC，則需要MSC網(wǎng)絡(luò)開啟MTRR/MTRF，否則會(huì)造成MT掉話。移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
移動(dòng)回通歸信論壇LTE小區(qū)重選和快速重定向的比較小區(qū)重選reselectionUE進(jìn)入空閑態(tài)后做RAU或LAU/RAU，然后再次進(jìn)入空閑態(tài)。在空閑態(tài)讀系統(tǒng)消息得到臨小區(qū)信息。根據(jù)重選判據(jù)選擇LTE小區(qū)，也何能由于移動(dòng)造成當(dāng)前無(wú)線環(huán)境變化而進(jìn)入其他RAT如TDS覆蓋。用戶活躍數(shù)據(jù)可能使UE無(wú)法短期進(jìn)入空閑態(tài)?？焖僦囟ㄏ騀RCSFB通話結(jié)束，GSM通過(guò)RRChannelRelease直接定向UE到指定LTE頻率UE在無(wú)需做LAU和RAU可快速回到LTE由于UE移動(dòng)可能導(dǎo)致離開LTE覆蓋區(qū)，致使FR失敗。–需要有能力識(shí)別適用
FR終端，否則對(duì)一些（例如漫入）客戶可能會(huì)造成一些問(wèn)題。m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
連接態(tài)CSFB的特點(diǎn)LTE
RRC
連接已經(jīng)具備，可以省去RRC連接建立時(shí)延約100~200msMT連接態(tài)時(shí)，用CSServiceNotification而不是PCCH:CS
paging。在GSMCSFB通話結(jié)束后LAU/RAU后可能會(huì)進(jìn)入數(shù)據(jù)傳輸模式，這時(shí)應(yīng)關(guān)閉應(yīng)用，以使UE重選會(huì)LTE。移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
內(nèi)容CSFB
簡(jiǎn)介EPC/LTE簡(jiǎn)介CSFB關(guān)鍵信令/流程CSFB
KPICSFB性能優(yōu)化移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
KPI呼叫建立時(shí)延LTE回歸時(shí)延電路域不可及時(shí)間(G->T)移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
CSFB過(guò)程空口關(guān)鍵步驟被叫響應(yīng)被叫流程:paging->ESR(CSFB
indication)LTE
RRC連接建立（空閑態(tài)）為了承載NAS信令:ESR
（CSFB
indication/CS
terminatingcall）GSM找網(wǎng)：Turn
away
to
GSMLTE
RRC
觸發(fā)GSM找網(wǎng)，包括讀必要的系統(tǒng)消息（例如SIB2包括小區(qū)接入信息）并接入小區(qū)GSM語(yǔ)音呼叫流程CM
Service
Request/Paging
Response
->NAS
Setup->Alerting->…->Disconnect->NAS
release->
RR
channelrelease移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
通話結(jié)束，回歸LTE重選回LTE
（Reselection）GSM
RR
release->LAU/RAU->測(cè)量找網(wǎng)。。。->讀LTE
SIB->TAU->TAU
accept快速定向到LTEGSM
RR
release
帶有指定重定向的LTE頻點(diǎn)->讀LTE
SIB
->
TAU->TAU
accept移動(dòng)通信
m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
移動(dòng)通信
L2L
CSFB端到端流程分解m
Privilegeand
Con通fide信nt人ial
才網(wǎng)
移動(dòng)通信
Exemplary
CSFB
Call
flowNo
UE
processingdelayGSMCS
callflowAdditional
process
than
anormal
GSM
callDelta
in
paging
delay
for
MT
callRRC
connection
for
sending
NASESRTune
away
to
GSMGSM
SIBreadingPCCH:
paging
with
CS
Doman
indicator45:13.4NAS
Extended
service
request:mobile
originating
CS
fallback45:13.4rrcConnectionRequest:
establishmentCause
mo-Data45:13.5rrcConnectionSetup45:13.5rrc
plete45:13.5LTE
ConnectionRelease
to
GSM
=8Tune
away
to
GSM45:14.8SYST
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