7. Circuit Switch Overview-Cont’
what is MSC?
Mobile Switching Center (MSC)
Combines of MSC-S & M-MGw
Responsible for:
– Routing traffic and
– Signaling information in the network
Some functions:
– Call control management (Registration,..)
– Mobility management (Location update,
handover, call routing,…)
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8. Circuit Switch Overview-Cont’
What is GMSC?
Gateway MSC (GMSC)
Interface with fixed network (PSTN/ISDN)
Retrieve information form HLR for location of
sub.
Route all calls to appropriate MSC/VLR
Also perform charging for mobile terminate call
8
9. Circuit Switch Overview-Cont’
What is HLR/AuC?
Home Location Register (HLR)
Centralized database of subscriber
– Administrative information
– Subscriber registration
– Any supplementary services
Authentication Center (AuC)
– Ciphering
– User authentication
9
10. Circuit Switch Overview-Cont’
What is VLR?
Visitor Location Register (VLR)
Database for both subscriber
information and
Information relates to MSC in
service area
One VLR for each MSC
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12. Packet Switch Overview-Cont’
What is SAU, PDP, SDS?
HLR Subscriber
SAU
– Stand for Simultaneously
Attached Users GSM/WCDMA
– Subscriber attached to the Sub
network
PDP Packet Sub
– Packet Data Protocol
– Data structure present for both
SGSN/GGSN
– Contains subscriber’s session SAU
information (Active user)
– Information such as IP address,
IMSI, Subscriber tunnel ID
SDS
SDS
– Simultaneous Data Session
– Can be a PDP or more
PDP
12
13. Packet Switch Overview- Cont’
What is SGSN?
Serving GPRS Support
Node
Packet routing and
transfer to/from SGSN
service area
Output of charging data
Session management
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14. Packet Switch Overview- Cont’
What is SGSN?
Connection to other nodes
(HLR, MSC, BSC, SMS-
GMSC, SMS-IWMSC,
GGSN).
Mobility management
Ciphering and
authentication
14
15. Packet Switch Overview- Cont’
What is GGSN?
Stand for Gateway GPRS
Support Node
Provide interface to
external packet network
Act as the router for routing
IP address for all
subscribers
Functionality for
associating subscriber to
the right SGSN
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16. Packet Switch Overview- Cont’
What is GGSN?
Charging support
(Output of billing)
GPRS session
management toward
external
Firewall
Border gateway
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19. One Family, Different Generations..
WCDMA
2G
GSM/GPRS WCDMA
EDGE
WCDMA
WCDMA
3G
Time
19
20. People want mobile
communication
Mobile voice traffic by region
35
30 LAM
25
Teraminutes
CEMA
20
15 APAC
10
NAM
5
WE
0
2005 2006 2007 2008 2009 2010 2011 2012
Cambodia: 66% growth Y on Y in number of subscribers (Q2 2008)
20
29. Network Evolution
IP Multimedia Subsystem (IMS)
Evolution to all IP
(Wireline/Wireless)
IMS
Multimedia services enable
– File sharing
– Video HSPA
PLMN
– Voice
– Text message
WiFi Hotspot Fixed Wireless
– Presence WLAN terminal
PC with WLAN
Soft client Phone
CS mobile phone PC with
Soft client
29
