1. Mobile Switching Systems Unit, L M Ericsson in Finland
Media Gateway
Mika Ahola
Mobile Switching Systems Unit, L M Ericsson in Finland

2. Outline Background New network architecture Media gateway
Standardization
Summary

3. - a challenge, a possibility Fixed <> Mobile Technologies
Background
The New Telecoms World
- a global marketplace
- a challenge, a possibility
Liberalization
Global customers
IP & Internet
Competition
Price pressure
Fixed <> Mobile Technologies

4. Wireless Internet Services
News, weather, sports
Traffic information
Directory services
Time tables
Location-dependant information services, like “find a nearby restaurant”

5. GSM/UMTS Network (Phase 1)
PSTN/ISDN
Internet/ intranet
GSM/UMTS core network
GSM radio access
UMTS radio access
GSM
GSM/UMTS
UMTS
This picture illustrates one cornerstone in the Ericsson UMTS strategy:
The core network providing services for UMTS will be based on evolvement of the GSM core network with the addition and modification of services.
One and the same core network will simultaneously serve both an evolved GSM access (including EDGE) as well as the new UMTS access.
Dual mode mobiles are essential for a flexible introduction of UMTS. Handover and roaming between the GSM access and the UMTS access shall be supported.
The most economic way for both operator and end-user in achieving mobile multimedia capabilities, for a range of bandwith, narrow and wide band, and type of services.
Narrow band
Wide band
Access to people and information

6. UMTS/GSM Reference Model
User equipment
GSM BSS
Core network
External network
SCP
SMS- GMSC
SIM MT
BTS
BSC Um
Abis
SIM MT
BTS
BSC
MSC
GMSC A Gb
EIR
UTRAN Iu
HLR
AUC
USIM ME
BTS
RNC Iu
SGSN
This is the total reference model used in ETSI for a combined GSM/UMTS network. It consist of three major parts
A GSM radio network
A UMTS radio network
A GSM/UMTS core network
The terminals MT and ME can be single or dual mode. Handover between the radiointerface will be standardized.
Also see previous picture text Cu Uu
Iub
Iur
GGSN
USIM ME
BTS
RNC

7. UMTS Standardization Abis A Iu Iub Revolution Evolution Core network
GSM based evolution to UMTS
-circuit switched evolution
-packet switched (GPRS) evolution
Abis A Iu
Iub
GSM BTS
GSM BSC
UMTS BTS
UMTS RNC
UMTS standardization will mean a new radionetwork is introduced called UTRA and based on WCDMA technology. New basestations and RNC (“BSC: s”), but infrastructure like shelters, towers, cooling and power can be reused. On the core network side standardization and products will be evolved from circuit to packet by GPRS and then both circuit and packet evolution when adding UMTS.
Interfaces are shown.
Revolution
Evolution

8. Migration Roadmap Core network GPRS GGSN+ SGSN HSCSD MSC Radio network
Packet switched
GGSN+ SGSN
Bandwidth
Circuit switched
HSCSD
MSC
Radio network
UTRAN WCDMA
GSM has several steps on the roadmap the coming years. It is important to understand the nature of each step.
Core network is the first part that will be evolved first with HSCSD –High Speed Circuit Switched Data, increased speed by multislot technology in the radio interface, which increases user bitrate on circuit switched data services.
By introduction of GPRS the Core Network takes the step into the packet switched services.
The radio interface is developed in two steps, first EDGE a new modulation scheme on existing GSM channel structure. Then a new radionetwork WCDMA/UTRA optimized for packet data transport.
When looking upon these steps it is important to understand what they mean to me as an operator. They effect different parts of the network and depending on how I use them, they effect the business in different ways.
EDGE
Bandwidth
GSM

9. ? Value Added Services Service enabling technology Infrastructure
Service Production
Functionality
IT based services
Value Added Services
SIM toolkit ?
Service enabling technology
WAP
Applications
SERVER
VOICE MAIL IN
GSN
During the lifetime of mobile communications the way of producing services have changed. In the beginning of the 90´s we had a split between basic telecom services produced in the infrastructure (MSC: s) and supplementary/value added services. During the recent years the functionality of services has increased, going towards more and more IT based services. At the same time a new type of infrastructure has grown up in producing services, we call it Service Enabling Technology. Today we have a split between three domains instead of two.
Infrastructure
MSC
BSS
Time

10. Next-generation Network Structure
Today
Single-service networks
Future
Multi-service networks/client-server
Servers
Services
Content
Content
Communcation
applications Control
Backbone Network
Cellular/PLMN
PSTN/ISDN
Data/IP Networks
CATV
Wireless
Access
Cable
Access
Wireline
Access
Access Transport & Switching Networks
Clients/Applications

11. Connectivity backbone
Ericsson Network Architecture
Appl Servers
Application
SCP
SCS
HLR
Control
MSC Server
GSN Server
Connectivity
Internet
Intranets
MGW
Connectivity backbone
(STM, ATM, IP, …)
Resource Node
MGW
MGW
MGW
PSTN/ISDN/ PLMN
UTRAN
Wireless AN
UTRAN
Wireline AN
Media Gateway, handling User Plane
Server, handling Control Plane & Applications

12. 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

13. Backbone Network MGW MGW MGW MGW AXD AXI 540 AXI 520 ATM ATM ATM ATM

14. Services/Applications Outside Core Network
Application n
Open I/F
Service Capability Servers
PLMN Gen 2
UMTS PLMN Gen 3
PSTN/ ISDN
Other members IMT-2000 Family

15. UMTS Standardization Bodies for New Architecture
ITU-T
SG11
Control
HLR
MAP
GMSC
/Transit
Server
MSC
Server
BICC
RANAP
ITU-T
SG16
N-ISUP
GCP
MEGACO
GCP
PSTN/ISDN
PLMN
Internet/
Intranet
UTRAN
Media GW
Media GW
BTS
RNC
Connectivity Backbone NW
ATM, IP...
Sigtran
3GPP R00
Architecture
SS7 over IP

16. Reference Architecture for an All IP Network
Source:
3GPP TR V1.0.0 ( )

17. 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