Gsm architecture

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

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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


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

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

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


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 .


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

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


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…)


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


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 )

11 © NOKIA MSC Server marketing1 .PPT / 26.9.2000 / Tu/
A KN

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

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

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


S ecurity Level: INTE RNA L

Thanks
www. hua we i. c o m
www.h u awe i.com


Gsm architecture

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