This document describes the evolution of 2G and 3G mobile network architectures. It shows: 1) The separation of the control plane and user plane in 3GPP Release 4, with the MSC Server handling signaling and Media Gateways handling transmission. 2) How the MSC Server system provides operational expenditure savings by moving voice and signaling transmission to IP networks and separating equipment for more flexible siting. 3) How the MSC Server system allows investment protection by supporting existing services on GSM, EDGE, 3G and TDM, IP, and ATM transmission networks.

1. G S M 2G Bas ic N e twork Arch ite ctu re
Internet
GPRS (TCP/IP)
2G SGSN
PS Core
GGSN
GSM
mobile
BSS SRRi
Base Station Subsystem CS Core
BSC T
GSM BTS C
GSM S MSCi HLR
mobile M
mobile Indoor 2G
BTS PLMN/PSTN/ISDN
IN SCP
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2. 3G PP R99 A rchitecture
Internet
GPRS (TCP/IP)
2G/3G SGSN
GGSN
GSM
mobile
BSS
CS Core SRRi
Base Station Subsystem
BSC T
GSM BTS C
GSM S MSCi HLR
mobile M
M
G
R W
N
C
3G MSC
mobile 3G BTS
(Node B) PLMN/PSTN/ISDN
IN SCP
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3. MS C S erver - s eparates us er and control
plane
MSC 3GPP Rel99 MSC Server 3GPP Rel4
• MGW is a part of 3G MSC • MGW is separate from MSS
• GSM and 3G Circuit Switching • GSM and 3G Circuit Switched services
• Transmission is TDM • Transmission is IP (also ATM can be
used)
• Voice and signaling over IP
MS Ci - M11 MS S M12
A TDM based
Backbone & PSTN
A' H.248/Megaco
Sigtran
Packet based
Backbone (IP/ TM)
A
Iu-CS A & Iu-CS & TDM based PSTN
MGW - U1 .5 MGW - U2
control plane
user plane
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4. 3G PP Rel. 4 A rchitecture
Network Operator
Application Plane
CAP/INAP CAP/INAP
APSE
HLR
MAP MAP
MSC
Server Control Plane
BICC-CS-2 / SIP-T MSC Server or GCS
Sigtran/ Sigtran/
Megaco, H248 Megaco, H248
GSM/EDGE BSS A User Plane
IP/MPLS/ATM
3G RAN Iu-CS PSTN
Backbone
MGW MGW
Control Plane and User plane separated in Rel-4
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5. MS C S erver s ys tem brings OPE X s avings
Ne w M SC Se r ve r w o r l d
 Vo ic e a n d s ig n a lin g l
o ve r I P
M S S  N o t r a n s it s w it c h e s
needed
 O &M S a v in g s
 F r e e M S S s it e
GE RAN
l c a t io n
o
 M GWs in u n m a n n e d
H .2 4 8
S ig t r a n B S C / RN C s it e s
U T RAN A  H ig h c a p a c it y , s m a l l
M G W
T r f l s m sispsaio n s a v in g s
an o r
o ce
I P / AT M M G W
I u -CS  L o c a l s w it c h in g
 B a n d w id t h s a v in g s
PS TN / I S D N
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6. Inves tment protection – C A PE X
s avings
I N
Fu l s u pport
l f o r e x is t in g
MA s e r v ic e s
P
C AP / I N A
 GS M / E D GE s u p p o r t
C AP / I N AP /
M AP P
H L R
M AP M AP
 T D M , I P a n d AT M
M S S M S S t r a n s m is s io n
 3G
GE RAN GE RAN
Mc Mc L o n g t e r m in v e s t m e n t
A M G
I P / AT
M M G A
p r o t e c t io n
W Bac k b o W
ne Al M S C S e r v e r s y s t e m
l
U T RAN
U T RAN el ment s
e
l -CS
u l -CS
u
s u pport f u l I P M u l im e d ia ,
l t
PS T N / I S
DN
3 GP P Re l / Re l / Re l 7
.5 .6 .
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

7. Rel.4 Network Des ign with MS S and MG Ws
Network Operator
Application Plane
CAP/INAP CAP/INAP
APSE
HLR
MAP MAP
MSC
Server Control Plane
BICC-CS-2 / SIP-T MSC Server or GCS
Sigtran/ Sigtran/
Megaco, H248 Megaco, H248
GSM/EDGE BSS A User Plane
IP/MPLS/ATM
3G RAN Iu-CS PSTN
Backbone
MGW MGW
Control Plane and User plane separated in Rel-4
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

8. MS C S erver, MS S (M13.2)
 2G/ CS traffic control in Rel4-based networks
3G
O v e r v ie w
 Media transportation handled by MGW
• GSM and WCDMA call control and
F u n c t io n a l y
it mobility management
• Controls several MGWs
• VLR, SSP, SMS, CS-data
C a p a c it y • 1 ,200,000 subscribers
• 1 ,200,000 BHCA
• 1 ,200,000 SMS/
BH
• 41 ,500 simult. calls
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9. Dis tributed Network A rchitecture of Us er Plane

M G W will b e locate d as clos e as th e acce s s ne twork to
h and le local s witch ing.
A MG
MSC Server W MSC Serverd e s 1 or m ore MG Ws
s ite inclu
A MG W s ite m ay h ave conne ctions to:
MGW Site 1 G S M BS S
WD C M A R AN
MGW Site 2
PS TN
O th e r M G W s ite s via an inte r-s ite b ackb one :
BSC MGW
A
MGW → Ibcb n
P ako e
GSM → A Mb c MGW e MGW
T ako bn BSC
→ TDMb c b n
ako e A
GSM
M G Ws o n th e s ite are conne cte d to e ach oth e r with an
RNC
IP/ATM/TDM
intra-s ite b ackb one
MGW Backbone
Iu
WCDMA Intra-s ite traffic is d is trib uMGW e ve nly am ong th e MG Ws on
te d RNC
Iu
th e s ite WCDMA
PSTN/
PLMN
PSTN/
PLMN
• Dimensioning can be done according to subscriber and traffic parameters
(number of 2G/3G subscribers, traffic per subscriber, call length, PSTN
interconnection point, used codec inside MSS network…)
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10. MG W Dimens ioning C riteria
 Th e M G W d oe s not inclu d e any s u b s crib e r d atab as e s s o it d oe s not
 care ab ou t th e nu m b e r of s u b s crib e rs , only ab ou t th e am ou nt of
 traffic ge ne rate d b y th os e s u b s crib e rs
 M G W is d im e ns ione d b as e d on
 B u s y H ou r C all Atte m p t (BH C A)
 N u m b e r of S im u ltane ou s C alls
 # of TD M P orts R e qu ire d
 # of ATM P orts R e qu ire d
 # of IP P orts R e qu ire d
 # of TC U (Trans cod ing U nit) R e qu ire d
 # of IS U (Inte rface S ignalling U nit) R e qu ire d
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11. MS C S erver overview
 Th e M S C S e rve r is a circu it-s witch e d call control p rod u ct
offe ring all G S M and 3G circu it-s witch e d s e rvice s .
 Th e M S C S e rve r allows op e rators to:
 p rovid e s am e C S s e rvice s as with an MS C
 com b ine trans p ort of voice and d ata (G P R S )
in a s ingle trans p ort ne twork
 op tim ize s ignaling & trans p ort ne tworks ,s e p arate ly
p u rch as e call control and traffic cap acity
 h ave a cle ar e volu tion to IP b ackb one with th e M G W
 th e M S C S e rve r is a fu nctionality wh ich can b e u p grad e d from
th e M S C i and TM S C i ne twork e le m e nts (2G or 3G )
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
11 © NOKIA MSC Server marketing1 .PPT / 26.9.2000 / Tu/
A KN

12. Integrated MS C S erver
 S till s u p p orts fu ll M S C i fu nctionality
 C ontains
 G ate way M S C F u n ctionality
 Vis ite d M S C F u nctionality
 M e d ia G ate way C ontrol F u nction
2) MSS activation
MSCi - M11 1 ) M1 2 upgrade MSCi - M12 MSS
GMSC VMSC GMSC VMSC GMSC VMSC
Switching IWF Switching IWF Switching IWF
MGCF
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13. S G W in MG W
MSC Server MSC Server
TDM
GSM BSS IP/ATM
BSC
2.
TDM
SGW SGW
ATM/IP 3.& 4.
ATM Backbone
PSTN/
1. MGW
PLMN
WCDMA
RNC
1) RANAP (SS7) / ATM <---> IP
2) BSSAP (SS7) / TDM <---> IP
SIGNALING 3) MAP/CAP/INAP (SS7 SCCP) / TDM <---> IP
TRANSPORT 4) ISUP/TUP/IUP (SS7 MTP3) / TDM <---> IP
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

14. Rel4 Network Interfaces & Protocols
HLR
Services
CAP BICC for Call
MAP
Control
H.248 for BICC, SIP
MSS ATM/IP (G)MSS
MGW control
Nc ISUP over IP
RANAP or
towards
BSSAP H.248 Mc
PSTN
towards IP H.248
radio Mc IP
network
RANAP AAL2/AAL5
AAL5/ATM ATM Nb SS7
PSTN
Iu- CS TDM
RTP
MGW IP (G)MGW
BSSAP
RNC AAL2
User data over
A
ATM BSC ATM or IP or TDM
TDM
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15. S ecurity Level: INTE RNA L
Thanks
www. hua we i. c o m
www.h u awe i.com
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