Media Gateway
Mika Ahola
mika.ahola@ericsson.fi
Mobile Switching Systems Unit, L M Ericsson in Finland
Media Gateway
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Outline
 Background
 New network architecture
 Media gateway
 Standardization
 Summary
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Background
Liberalization
Competition
Global
customers
The New Telecoms World
- a global marketplace
- a challenge, a possibility
IP &
Internet
Price pressure
Fixed <> Mobile
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Technologies
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Wireless Internet Services
 News, weather, sports
 Traffic information
 Directory services
 Time tables
 Location-dependant information
services, like “find a nearby restaurant”
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GSM/UMTS Network (Phase 1)
Internet/
intranet
PSTN/ISDN
GSM/UMTS
core network
GSM
radio
access
GSM
Narrow
band
UMTS
radio
access
GSM/UMTS
UMTS
Wide band
Access to people and information
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UMTS/GSM Reference Model
User equipment
SIM
BTS
MT
Um
SIM
GSM BSS
MT
External
network
Core network
BSC
SCP
SMSGMSC
MSC
GMSC
Abis
A
BSC
BTS
BTS
BTS
BTS
BTS
Gb
UTRAN
USIM
ME
Cu
USIM
Media Gateway
Uu
ME
6
BTS
BTS
BTS
BTS
BTS
BTS
BTS
BTS
BTS
BTS
Iu
RNC
Iub
EIR
Iu
HLR
AUC
SGSN
Iur
RNC
GGSN
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UMTS Standardization
Abis
GSM
BTS
A
UMTS
BTS
7
Iu
UMTS
RNC
Revolution
Media Gateway
GSM based
evolution to
UMTS
GSM
BSC
Iub
Core network
-circuit switched
evolution
-packet switched
(GPRS)
evolution
Evolution
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Migration Roadmap
Packet switched
GPRS
GGSN+
SGSN
Circuit switched
HSCSD
Bandwidth
Core
network
Radio
network
UTRAN
WCDMA
EDGE
Bandwidth
MSC
GSM
1998
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1999
2000
2001
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Service Production
Functionality
IT based services
Value Added
SIM
Services
toolkit
Service
WAP
enabling
SERVER
technology
IN
?
Applications
VOICE
MAIL
GSN
MSC
BSS
Infrastructure
Time
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Next-generation Network Structure
Today
Future
Single-service networks
Multi-service networks/client-server
Services
Content
CATV
Data/IP Networks
PSTN/ISDN
Cellular/PLMN
Communcation
applications
Access Transport & Switching Networks
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Content
Servers
Control
Backbone Network
Wireless
Access
Wireline
Access
Cable
Access
Clients/Applications
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Ericsson Network Architecture
Appl Servers
Application
SCP
SCS
HLR
Control
MSC
Server
GSN
Server
Connectivity
MGW
Connectivity backbone
(STM, ATM, IP, …)
Resource
Node
MGW
MGW
UTRAN
Wireless AN
UTRAN
Wireline AN
Internet
Intranets
MGW
PSTN/ISDN/
PLMN
Media Gateway, handling User Plane
Server, handling Control Plane & Applications
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Features of New Architecture:











Separation of call control and connectivity/bearer control
Flexible architecture that is possible to use for any connectivity (ATM, IP, STM)
Keep the N-ISDN/GSM service paradigm. Use MAP, ISUP, etc.
All devices needed for user plane manipulation are moved to the Media Gateway
(echo cancellers, codecs, etc.)
Possible to place infrequently used equipment in centralized resource nodes
Transmission efficient to have coded speech all the way to the rim of the PLMN
UTRAN and the Iu interface is ATM based. A good way to bring in ATM in the core
network is needed
Allows stable and mature introduction of UMTS networks since building on GSM
products
New protocol to control media gateway remotely
Services/applications outside core network enables service convergence
In line with standardization trends
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Backbone Network
MGW
ATM
AXD
AXI 540
ATM
MGW
ATM
ATM
ATM
ATM
MGW
AXI 520
ATM
ATM
MGW
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Services/Applications Outside Core Network
Application 1
Application 2
Application n
Open I/F
Service Capability Servers
PLMN
Gen 2
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UMTS
PLMN
Gen 3
PSTN/
ISDN
Other
members
IMT-2000
Family
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UMTS Standardization Bodies for New Architecture
Control
HLR
MAP
MSC
Server
ITU-T
SG11
BICC
GMSC
/Transit
Server
ITU-T
SG16
RANAP
N-ISUP
GCP
GCP
MEGACO
UTRAN
BTS
RNC
PSTN/ISDN
PLMN
Internet/
Intranet
Media
GW
Media
GW
Connectivity Backbone NW
ATM, IP...
Sigtran
3GPP R00
Architecture
SS7 over IP
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Reference Architecture for an All IP Network
Alternative
Access
Network
Legacy mobile
signaling
Network
Applications &
Services *)
SCP
Mh
SGSN
GGSN
Mw
CAP
Gn
Other PLMN
Gp
CSCF
R
Um
Iu-ps'
TE
R
T-SGW *)
Mc
GGSN
Gi
Gn
Iu 1
UTRAN
MT
Gi
MGCF
Gi
Gc
SGSN
Iu
Mg
MRF
Gf
ERAN
MT
Mr
Gi
EIR
TE
Mm
Cx
HSS *)
Gr
Multimedia
IP Networks
CSCF
R-SGW
Ms
MGW
MGW
Uu
Iu 2
PSTN/
Legacy/External
Nb
Mc
Mc
1
Iu = Iucs (RTP, AAL2)
Nc
MSC server
Iu 2 = Iu(RANAP)
GMSC server
T-SGW *)
MAP
MAP
Applications
& Services *)
Signalling Interface
Signalling and Data Transfer Interface
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Mh
HSS *)
R-SGW *)
*) those elements are duplicated for figure
layout purpose only, they belong to the same
logical element in the reference model
Source:
3GPP TR 23.922
V1.0.0 (1999-10)
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Summary
 Ericsson offers via the layered architecture an evolutionary approach to
the multi-service network
 Ericsson offers deployment of ATM & IP-based transport technologies
for both UMTS and GSM/GPRS based on open standards.
 A Media Gateway product is introduced handling all user plane data in an
integrated way and that connects to ATM & IP backbones
 New network architecture will be included in release 00 of 3GPP
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