09-08-2012, 11:25 AM
UMTS
[attachment=30706]
History of 3G
At 1985 : ITU started the process of defining the standard for third generation systems, referred to as International Mobile Telecommunications 2000 (IMT-2000)
Some of the features that IMT-2000 3G network must include
1-Circuit and packet oriented services
2-Simultaneous multiple services
3-Symmetrical and Asymmetrical services
4-Migration path from 2G systems
5-Supporting Multimedia services
Car speed environment: 144kbps
Walk speed environment: 384kbps
Indoor environment: 2048kbps
3GPP R99 network Architecture
Interoperability with GSM
CS domain elements are able to handle 2G and 3G subscribers.
Changes (upgrades) in MSC/VLR and HLR/AC/EIR.
For example SGSN
2G responsible for mobility management (MM) for packet connections
3G MM divided between RNC and SGSN
3GPP R4 network Architecture
The 3GPP R4 introduces separation of the connection, its control, and services for CS domain of CN.
Media Gateway (MGW): an element for maintaining the connection and performing switching function when required.
MSC server: an element controlling MGW and responsible for signaling
Packet switched voice
The CS call is changed to the packet switched call in MGW.
[attachment=30706]
History of 3G
At 1985 : ITU started the process of defining the standard for third generation systems, referred to as International Mobile Telecommunications 2000 (IMT-2000)
Some of the features that IMT-2000 3G network must include
1-Circuit and packet oriented services
2-Simultaneous multiple services
3-Symmetrical and Asymmetrical services
4-Migration path from 2G systems
5-Supporting Multimedia services
Car speed environment: 144kbps
Walk speed environment: 384kbps
Indoor environment: 2048kbps
3GPP R99 network Architecture
Interoperability with GSM
CS domain elements are able to handle 2G and 3G subscribers.
Changes (upgrades) in MSC/VLR and HLR/AC/EIR.
For example SGSN
2G responsible for mobility management (MM) for packet connections
3G MM divided between RNC and SGSN
3GPP R4 network Architecture
The 3GPP R4 introduces separation of the connection, its control, and services for CS domain of CN.
Media Gateway (MGW): an element for maintaining the connection and performing switching function when required.
MSC server: an element controlling MGW and responsible for signaling
Packet switched voice
The CS call is changed to the packet switched call in MGW.