3g call flow
TRANSCRIPT
3GCALL FLOW
3g network architecture
GSM/WCDMA common core with interfaces
R Um
SGSN
SGSN
Signaling
Signaling and/or Data
Gb
Mc
Nb
Nc
MAPMAP
Mc
Gi
Gp
Gn
Gf
Gr Gc
Gi
Gn
PS Domain
CS Domain
A
Other PLMN’s
PSTN / Legacy / External
Multimidea IP
Networks
Applications & Services
EIR
HSS
HSS
R Uu
IuPS
IuCS
TE MT UTRAN
TE MT GERAN GGSN
MGW
MSC Server GMSC Server
MGW
HLR/AUC
HLR/AUC
2G RAN
3G RAN
Figure 9-29: Adding the Termination toward the RNC
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDN
T4
T5
T6
ADD
T1
Cxt=1
Ctx=$ ADD(T$(MediaDes(LocalConDes(Mode=SR, BCP/BNCChar=AAL2,3gup/mode=SUPP, 3gup/interface=RAN, 3gup/Initdir=IN),LocalDes(AMR, Req.BIR, Req.BA),RemoteDes(AMR))))
Figure 9-30: Parameters in the ACCEPT reply
Ctx=1 ADDreply(T1(MediaDes(LocalDes(BIRT1, BAT1))))
BA and BIR is sent to the RNC as RAB assignmentis ordered and Bearer Set-up is triggered.
Figure 9-31: Adding a Termination in MGW-1 toward the Core Network
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDN
T4
T5
T6
T1
Cxt=1
ADD
T2
Ctx=1 ADD(T$(MediaDes(LocalConDes(Mode=RO, BCP/BNCChar=AAL2,3gup/mode=SUPP, 3gup/interface=CN, 3gup/Initdir=OUT),LocalDes(TMR, USI, Req.BIR, Req.BA),RemoteDes(TMR, USI))))
Figure 9-32: Acknowledgement of T2
Ctx=1 ADDreply(T2(MediaDes(LocalDes(BIRT2, BAT2))))
Figure 9-33: Adding a Termination in MGW-2 toward the Core Network
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDN
T4
T5
T6
T1
Cxt=1
ADD
T2 T3
Cxt=2
Ctx=$ ADD(T$(MediaDes(LocalConDes(Mode=SR, BCP/BNCChar=AAL2,3gup/mode=SUPP, 3gup/interface=CN, 3gup/Initdir=IN),LocalDes(TMR, USI),RemoteDes(TMR, USI, BIR, BA),BE_EVENT, SignalsDes(EstBNC))))
Figure 9-34: Acknowledgement of T3
Ctx=2 ADDreply(T3)
Bearer Set-up is triggered, ERQ is sent.After reception of confirmation (ECF):
Ctx=2 NOTIFY(T3(ObsrvdEvntDes(BE_EVENT)))
Ctx=2 NOTIFYreply(T3)
Figure 9-35: Adding a Termination toward the ISDN network
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDNT5
T6
T1
Cxt=1
T2 T3
Cxt=2
ADD
T4
Ctx=2 ADD(T4(MediaDes(LocalConDes(Mode=SR, BCP/BNCChar=TDM), LocalDes(TMR, USI), RemoteDes(TMR, USI))))
Figure 9-36: Acknowledgement of T4
Ctx=2 ADDreply(T4)
Figure 9-37: Insertion of an Echo Canceller in T4
Ctx=2 MODIFY(T4(MediaDes(LocalConDes(Mode=SR, BCP/BNCChar=TDM, tdmc/ec=on))))
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDNT5
T6
T1
Cxt=1
T2 T3
Cxt=2
T4
MODIFY
Figure 9-38: Acknowledgement of T4
Ctx=2 MODIFYreply(T4)
Figure 9-39: Through-connection in MGW-1
MGW-1
MSC TSC
MGW-2
Iu to RNC to ISDNT5
T6
T1
Cxt=1
T2 T3
Cxt=2
T4
MODIFY
Ctx=1 MODIFY(T2(MediaDes(LocalConDes(Mode=SR, BCP/BNCChar=AAL2,3gup/mode=SUPP, 3gup/interface=CN, 3gup/Initdir=OUT))))
Ctx=1 MODIFYreply(T2)
Figure 9-40: Acknowledgement of Through-connection