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Internal
OWA000001
WCDMA R4 Communication
Flow (For CN-CS)
ISSUE 1.0
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Chapter 1 Security Management
Chapter 2 Location Update Sequence of CS
Chapter 3 Call Sequence of CS
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Security Management
Network Authentication Function
User Authentication Functionfor USIM
Ciphering
Integrity Data Check
TMSI Reallocation
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Generation of Authentication Vectors
K
SQNRAND
f1 f2 f3 f4 f5
MAC XRES CK IK AK
AUTN := SQN AK || AMF || MAC
AV := RAND || XRES || CK || IK || AUTN
Generate SQN
Generate RAND
AMF
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AuthenticationMS VLR/SGSN HE/HLR
Generate authenticationvectors AV(1..n)
Store authentication vectors
Select authentication vector AV(i)
Authentication data request
Authentication data responseAV(1..n)
User authentication requestRAND(i) || AUTN(i)
User authentication responseRES(i)
Compare RES(i) and XRES(i)
Verify AUTN(i)Compute RES(i)
Compute CK(i) and IK(i) Select CK(i) and IK(i)
Authentication and
key establishment
Distribution ofauthenticationvectors from HEto SN
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User Authentication Function
K
SQN
RAND
f1 f2 f3 f4
f5
XMAC RES CK IK
AK
SQN AK AMF MAC
AUTN
Verify MAC = XMAC
Verify that SQN is in the correct range
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Integrity and Ciphering
MS
2. Initial L3 message with user identity, KSI etc.
VLR/SGSN
3. Authentication and key generation
1. Storage of HFNs START values and UE security capability
4 Decide allowed UIAs and UEAs
SRNC
1. RRC connection establishment includingtransfer of the HFNs START values and the UE security capability from MS to SRNC
5. Security mode command (UIAs, IK, UEAs, CK, etc.)
6. Select UIA and UEA, generate FRESHStart integrity
7. Security mode command (CN domain, UIA, FRESH,UE security capability, UEA, MAC-I, etc.)
10. Verify received message
9. Security mode complete (MAC-I, etc.)
11. Security mode complete (selected UEA and UIA)
8. Control of UE security capability, Verify
message, Start of integrity
UE security capability indicates UIAs and UEAs supported by MS
Start ciphering/deciphering Start ciphering/deciphering
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Integrity Data Check
f 9
COUNT-I DIRECTION
MESSAGE FRESH
IK
MAC -I
f 9
COUNT-I DIRECTION
MESSAGE FRESH
IK
XMAC -I
Sender
UE or RNC
Receiver
RNC or UE
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Ciphering
PLAINTEXT
BLOCK
f8
COUNT-C DIRECTION
BEARER LENGTH
CK
KEYSTREAM
BLOCK
CIPHERTEXT
BLOCK
f8
COUNT-C DIRECTION
BEARER LENGTH
CK
KEYSTREAM
BLOCK
PLAINTEXT
BLOCK
Sender
UE or RNC
Receiver
RNC or UE
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TMSI Reallocation
MS VLR/SGSN
TMUI Allocation Complete
TMUI Allocation Command
TMUIn, LAIn
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Abbreviations
AK Anonymity Key
AMF Authentication management field
AUTN Authentication Token
AV Authentication Vector
XRES Expected Response CK Cipher Key
CKSN Cipher key sequence number
IK Integrity Key
KSI Key Set Identifier
SQN Sequence number
MAC The message authentication code included in AUTN,
computed using f1*
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Chapter 1 Security Management
Chapter 2 Location Update Sequence of CS
Chapter 3 Call Sequence of CS
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Location Update Sequence
Brief Introduction to Location Update
Several Typical Location Update Sequences
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Brief Introduction to Location Update
Periodic Location Update
IMSI Attach/Detach
Normal Location Update
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Intra-VLR Location UpdateMS RNS MSC Server VLR
LAI & TMSI
HLR1 RRC Connection Request
2 RRC Connection Setup
3 RRC Connection Setup Complete
4 RRC : Initial Direct Transfer
5 RANAP: Initial UE Message (SCCP,CR)
6 SCCP,CC
7 Authentication & Ciphering
8 Forward New TMSI
9 Direct Transfer (Location Update Accept)
10Direct Transfer (TMSI Reallocate Complete)
11 TMSI ACK
Only sent to HLR if this
is the first time the MS
has Location Updated in
this VLR
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Intra-VLR Location UpdateMS RNS MSC Server VLR HLR
12 IU Release Command
13 RRC Release Command
14 RRC Release Complete
15 IU Release Complete
16 SCCP: RLSD
17 SCCP :RLC
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Inter-VLR Location Update-Using G Interface
LAI & TMSI
MS RNS MSC Server VLRn HLR VLRo
TMSI&LAIO
TMSI,IMSI,CK,,IK,R,X,AUTN)
1 RRC Connection Request
2 RRC Connection Setup
3 RRC Connection Setup Complete
4 RRC : Initial Direct Transfer
5 RANAP: Initial UE Message (SCCP,CR
6 SCCP,CC
7 Send IdentificationSend Identification Ack
Authentication & Ciphering
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MS RNS MSC ServerVLRn HLR VLRo
Inter-VLR Location Update-Using G Interface
8 Location Update Request
9 Cancel location
10 Cancel location ACK
11 Insert Subscriber Data
12 Insert Subscriber Data Ack
13 Location Update accept
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Inter-VLR Location Update-Using G InterfaceRNS MSC Server VLR HLR
14 IU Release Command
15 RRC Release Command
16 RRC Release Complete
17 IU Release Complete
18 SCCP: RLSD
19 SCCP :RLC
MS
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Inter-VLR Location Update-Without G Interface
LAI & TMSI
MS RNS MSC Server VLRn HLR VLRo
1 RRC Connection Request
2 RRC Connection Setup
3 RRC Connection Setup Complete
4 RRC : Initial Direct Transfer5 RANAP: Initial UE Message (SCCP,CR)
6 SCCP,CC
7 Identification Request
8 Identification Response
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MS RNS MSC Server VLRn HLR VLRo
Inter-VLR Location Update-Without G Interface
9 Location Update Request
10 Cancel location
11 Cancel location ACK
12 Insert Subscriber Data
13 Insert Subscriber Data Ack
14 Location Update accept
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Inter-VLR Location Update-Without G Interface
RNS MSC Server VLR HLR
15 IU Release Command
16 RRC Release Command
17 RRC Release Complete
18 IU Release Complete
19 SCCP: RLSD
20 SCCP :RLC
MS
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Chapter 1 Security Management
Chapter 2 Location Update Sequence of CS
Chapter 3 Call Sequence of CS
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Call Sequence
General Introduction to Call Sequence
CN-CS Detailed Call Sequence
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General Introduction to Call Sequence
General Introduction to MO Sequence
General Introduction to MT Sequence
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MO Service Flow
UTRAN CN
AS : PLMN Selection , Cell Selection , RRC Connection Setup , Iu Connection Setup
MM Procedures of NAS : Attach , Security Functions , Location Management;
Start Service : Call Control Procedures of CS , Section Management Procedures of PS , set up the service bearer
MM Procedures of NAS : Detach ( include the IMSI Detach, GPRS Detach )
AS : RRC Connection Release
Switch on
Switch off
AS :RRC
Non Access Stratum : MM/SM/CC/SMS
AS : RANAP
Iu Connection Release
Finish Service: Call Control Procedures of CS , Section Management Procedures of PS, release the service bearer
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Call Sequence
General Introduction to Call Sequence
CN-CS Detailed Call Sequence
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CN-CS Detailed Call Sequence
MO Sequence (UE->PSTN)
MT Sequence (PSTN->UE)
Call Clearing Sequence
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PSTN->UE
TDM Connection between MGW-O and PSTN exchange
Backward Bear Establishment
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UE>PSTN
C1
RANO MGWO
T1 T2
.
.
.
PSTN
Exchange
TDM
Preconditions:
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UE>PSTN
UE RNC-O
MSC
server-O MGW-O
PSTN
Exchange
Query VLR For Access Data
Query VLR For
Subscription Check
CM_Service_Req(Initial UE)
[IMSI/TMSI,CM_Serv_Type]
Auth_Req(DT)
[KSI,RAND,AUTN]/[CKSN,RAND]
Auth_Rsp(DT)
[XRES]/[SRES]
Security_Mode_Control / Cipher_Mode_Setting
[IK,EK,IPA,EA]/[Kc,CipherMode]
Security_Mode_Complete / Cipher_Mode_Complete
[Chosen IPA,EA]/[Chosen,CipherMode]
Setup(DT)
[Called Party BCD,Supported Codecs,
PLMN_BC,, Facility,LLC,HLC]
Call Proceeding(DT)
[PLMN_BC,Progress_Ind,Facility]
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UE>PSTN
UE RNC-O
MSC
server-O MGW-O
PSTN
ExchangeADD Request($,T2)
ADD Reply(C1,T2)
IAM
ADD Request(C1,$)
ADD Reply(C1,T1)
RAB Assignmen
TCH Assignment
TCH Assignment Complete
[ TerminationID = ?, ContextID=C1BNC-id = ?,
BIWF_Addr=?, BNC_CharNotifyNotRequested,
UPmode, UPVersion, Interface = Iu, InitDirect =Incoming,
Cut_Through_Direction = Backward(ReceiveOnly),
BC_Char = Derived from BC or Codec infor from Setup
(speech)
/Codec = Selected Codec (TrFO),
PLMN_BC = BC infor from Setup (Circuit Data) ]
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UE>PSTN
UE RNC-O
MSC
server-O MGW-O
PSTN
Exchange
ERQ(Q.2630 for AAL2 )
ECF(Q.2630 for AAL2 )
RAB ASSIGNMENT COMPL
IuUPInit
IuUPInit Ack
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UE>PSTN
UE RNC-O
MSC
server-O MGW-O
PSTN
Exchange
MOD Request(C1,T1)
MOD Reply(C1,T2)
Connect
[ TerminationID = T1, ContextID=C1
Cut_Through_Direction = Both ] /
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PSTN->UE
TDM Connection between MGW-O and PSTN exchange
Backward Bear Establishment
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UE>PSTN (Backward Bearer Establishment)
C1
RANO MGWO
T1 T2
.
.
.
PSTN
Exchange
IP/ATM
Preconditions:
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UE>PSTN (Backward Bearer Establishment)
UE RNC-O
MSCserver-O MGW-O
PSTNExchange
CM_Service_Req(Initial UE)
Auth_Req(DT)
[IMSI/TMSI,CM_Serv_Type]
[KSI,RAND,AUTN]/[CKSN,RAND]
Auth_Rsp(DT)
[XRES]/[SRES]
Security_Mode_Control / Cipher_Mode_Setting
[IK,EK,IPA,EA]/[Kc,CipherMode]
Security_Mode_Complete / Cipher_Mode_Complete
[Chosen IPA,EA]/[Chosen,CipherMode]
Setup(DT)
[Called Party BCD,Supported Codecs,PLMN_BC,, Facility,LLC,HLC]
Call Proceeding(DT)
[PLMN_BC,Progress_Ind,Facility]
Query VLR For Access Data
Query VLR For
Subscription Check
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UE>PSTN (Backward Bearer Establishment)
UE RNC-OMSC
server-O MGW-OPSTN
ExchangeADD Request($)
[ TerminationID = ?, ContextID=C1BNC-id = ?,
BIWF_Addr=?, BNC_CharNotifyNotRequested,UPmode, UPVersion, Interface = Iu, InitDirect
=Incoming,
Cut_Through_Direction = Backward(ReceiveOnly),
BC_Char = Derived from BC or Codec infor from Setup
(speech)/Codec = Selected Codec (TrFO),
PLMN_BC = BC infor from Setup (Circuit Data) ]
ADD Reply(C1,T1)RAB Assignment
TCH Assignment
TCH Assignment Complete
ERQ(Q.2630 for AAL2 )ECF(Q.2630 for AAL2 )
RAB ASSIGNMENT COMPL
IuUPInit
IuUPInit Ack
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UE>PSTN (Backward Bearer Establishment)
UE RNC-OMSC
server-O MGW-OPSTN
ExchangeADD Request($)
ADD Reply(C1,T2)
IAM (With Bearer Info)Bearer Establishemnt
UP Init
UP Init ackACM
Alerting
MOD Request(T1,signal=tone ID)
MOD Reply
ANM
MOD Request(T1,signal=tone ID)
MOD ReplyConnect
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CN-CS Detailed Call Sequence
MO Sequence (UE->PSTN)
MT Sequence (PSTN->UE)
Call Clearing Sequence
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PSTN->UE
C2
GMSC Server
C1
MSC Server-T
RANTMGW-G MGW-T
T4 T3 T2 T1
.
.
.
.
.
.
PSTN
Exchange
Preconditions:
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PSTN->UE
Forward Bearer Establishment
Backward Bear Establishment
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PSTN->UE (Forward Bearer Establishment)GMSCserver MGW-G
MSCserver-T MGW-T RNC-T UE
IAM
IAM
HLR Interrogation
Query VLR For Access Data
PagePage
RRC Connection Request
RRC Connection Setup
RRC Connection Complete
RRC:Page Response
Initial UE Message(Page Response)
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PSTN->UE (Forward Bearer Establishment)GMSCserver MGW-T
MSCserver-T RNC-T UE
Auth_Req(DT)
[CKSN,RAND,AUTN]/[CKSN,RAND]
Auth_Rsp(DT)
[RES]/[SRES]
Security_Mode_Control / Cipher_Mode_Setting
[IK,EK,IPA,EA]/[Kc,CipherMode]
Security_Mode_Complete / Cipher_Mode_Complete
[Chosen IPA,EA]/[Chosen,CipherMode]
Setup (DT)
[Called Party BCD, Codecs,
PLMN_BC,, Facility,LLC,HLC,Calling Party BCD]
Call Confirm (DT)
[PLMN_BC,Facility,Supported Codecs]
MGW selection
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[TerminationID = T2,ContextID=C1,BNC-ID = bearer1,BIWF_Addr = MGW-T]
ADD.req
PSTN->UE (Forward Bearer Establishment)GMSCserver MGW-G
MSCserver-T MGW-T RNC-T UE
[TerminationID = ?,ContextID=?BNC-id = ?,BIWF_Addr=?, BC_Char/Codec, BNC_CharNotifyRequested,UPmode, UPVersion, Interface = Nb,InitDirect =Incoming,Cut_Through_Direction = Both] (Codec selected whenTrFO)
(Network Side )
Prepare Bearer
ADD.rsp
APM(Bearer Info)
[BICC_Data(BNC-ID = bearer1,BIWF_Addr = MGW-T)]
MGW selection
ADD.req (Outcoming Side)
[TerminationID = ?,ContextID=?BNC-id = bearer1 ,BIWF_Addr=MGW-T, BC_Char/Codec, BNC_CharNotifyRequested,UPmode, UPVersion, Interface = Nb,InitDirect =Incoming,Cut_Through_Direction = Both]
Establish
Bearer
ADD.rsp
[TerminationID = T3,ContextID=C2
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PSTN->UE (Forward Bearer Establishment)
GMSC server MGW-GMSC server-T
MGW-T RNC-T UE
ERQ(Q.2630 for AAL2 ) /Request(Q.1970 for RTP)
ERQ(Q.2630 for AAL2 ) /Request(Q.1970 for RTP)
ADD.req (Incoming Side)[TerminationID = ?,ContextID=C2BNC-id = ?,BIWF_Addr=?,BC_Char/ Codec, BNC_CharNotifyRequested,UPmode, UPVersion, Interface = Nb,InitDirect =Incoming,Cut_Through_Direction = Both] (Codec recieved when TrFO)
PrepareBearer
ADD.rsp
[TerminationID = T4,BNC-ID = bearer3,BIWF_Addr = MGW-G]
APM(Bearer Info)
ERQ
ECF
UP Init
UP Init ack
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PSTN->UE (Forward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
Notify Req
Notify Rsp
UP Init
UP Init ackContinuity
Notify Req
Notify Rsp
Continuity
Prepare
Bearer
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PSTN->UE (Forward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
ERQ(Q.2630 for AAL2 )
ECF(Q.2630 for AAL2 )
IuUP-Init
[RFCI, SubFlowSizeInfo, IPTI, etc]
IuUP-Init Ack
RAB ASSIGNMENT COMPL
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PSTN->UE (Forward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
Modify.req
[ TerminationID = T1, ContextID=C1
Cut_Through_Direction = Both ] ]
Modify.rsp
ANM
ANM
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PSTN->UE
Forward Bearer Establishment
Backward Bear Establishment
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
IAM(+Bearer Info)
HLR Interrogation
Add req($)
Add rep
(TerminationID=T4,ContextID=C2)
Bearer Establishment
UP Init
UP Init ack
Notify Req(T4)
Notify Rep(T4)
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
ADD.req
ADD.rsp
[TerminationID = T3,ContextID=C2
IAM(Bearer Info)
Query VLR For Access Data
PagePagePage
RRC Connection Request
RRC Connection Setup
RRC Connection Complete
RRC:Page Response
Initial UE Message(Page Response)
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
ADD.req (Network Side )
[TerminationID = ?,ContextID=?BNC-id = ?,
BIWF_Addr=?, BC_Char/Codec, BNC_Char
NotifyRequested,
UPmode, UPVersion, Interface = Nb,InitDirect
=Incoming,
Cut_Through_Direction = Both]
Prepare Bearer
ADD.rsp
[TerminationID = T2,ContextID=C1,
Bearer Establishment
UP Init
UP Init ack
Notify Req(T2)
Notify Rep(T2)
[TerminationID = T2,ContextID=C1
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
ADD.req (Access Side )
[ TerminationID = ?, ContextID=C1BNC-id = ?,
BIWF_Addr=?, BNC_CharNotifyNotRequested,UPmode, UPVersion, Interface = Iu, InitDirect
=Incoming,
Cut_Through_Direction = Inactive (Not Send and
Receive),
BC_Char = Derived from BC o from USI in IAM(speech)/
Codec = Selected Codec (TrFO) ]
Prepare Bearer
ADD.rsp
[TerminationID = T1, ContextID=C1,
BNC-ID = bearer5, BIWF_Addr = MGW-T]
RAB ASSIGNMENT REQ
[ RAB-ID = RAB2, RAB Param ( Traffic
Class,MBR,GBR,DeliveryOrder,
MaxSDUSize,SDU Format,SDU RBER etc.) UPMode
= SMpSDU, UPversion,TCh Assignment
TCh Assignment Complete
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
ERQ(Q.2630 for AAL2 )
ECF(Q.2630 for AAL2 )
IuUP-Init
[RFCI, SubFlowSizeInfo, IPTI, etc]
IuUP-Init Ack
RAB ASSIGNMENT COMPL
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
AlertingACM
ACMModify.req
[ TerminationID = T2, ContextID=C1
NotifyOnEvent Not Included, Signal Direction = Outgoing,
SignalTiming (Singal Length, LoopTimes, Type = Begin),
Signal = specific Tone ID ]
Send Tone
Modify.rsp
Connect (DT)
Modify.req
[ TerminationID = T2, ContextID=C1
SignalTiming (Singal Length, LoopTimes, Type = End),Signal = specific Tone ID,Signal Direction = Outgoing ]
Modify.rsp
Stop Tone
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PSTN->UE (Backward Bearer Establishment)
GMSC server MGW-G MSC server-T MGW-T RNC-T UE
Modify.req
[ TerminationID = T1, ContextID=C1Cut_Through_Direction = Both ] ]
Modify.rsp
ANM
ANM
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CN-CS Detailed Call Sequence
MO Sequence (UE->PSTN)
MT Sequence (PSTN->UE)
Call Clearing Sequence
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Network Initiated Call Clearing
MSC server-O MGW-ORNC-OUE
ReleaseDisconnect
SUB Request(T2)
SUB Reply(T2)
Rlease completeREL
RLC
MOD Request(T1,signal=tone ID)
IU Release Command
IU Release Complete
SUB Request(T1)
SUB Reply
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UE Initiated Call Clearing
MSC server-O MGW-ORNC-OUE
DisconnectRelease
REL
RLC
IU Release Command
IU Release Complete
SUB Request(T1)
SUB Reply(T1)
Rlease complete
SUB Request(T2)
SUB Reply (T2)
UE I iti t d C ll Cl i
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UE Initiated Call Clearing
MSC server-O MGW-ORNC-OUE
Notify Req(T2)
Notify Reply(T2)
RleaseDisconnect
REL
RLC
IU Release Command
IU Release Complete
SUB Request(T1)
SUB Reply
Rlease Complete
SUB Request(T2)
SUB Reply(T2)
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Question
Please think over the sequence of UE to UE.
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Thank You