26-06-2013, 04:55 PM
Multimedia Broadcast/Multicast in UMTS
Multimedia Broadcast.ppt (Size: 402.5 KB / Downloads: 22)
What is MBMS?
Multimedia Broadcast/Multimedia Service
Aims to offer an efficient way to transmit data from single source to multiple destinations over radio network
Network resources are saved
MBMS is realised by addition of existing and new functional entities of the 3GPP architecture
Multimedia Broadcast/Multimedia Service
Aims to offer an efficient way to transmit data from single source to multiple destinations over radio network
Network resources are saved
MBMS is realised by addition of existing and new functional entities of the 3GPP architecture
Why Multicast/Broadcast is introduced to UMTS
For some applications multiple users can receive the same data in the same time: It would benefical for the network to transmit the data only once over a particular link.
Cell Broacast Services (CBS) can be used to transmit low bitrate data to particular cells (service areas).
IP multicast as such can not provide means for multiple subscribers to share radio or core network resources in UMTS system.
“With incresing use of high bandwidth applications in UMTS, especially with large number of users receiving the same high data rate services, efficient informantion distribution is essential. Thus broadcast and multicast are techniques to decrease the amount of data within the network and use the resources more efficiently.” 3GPP TS 22.146
MBMS Standardisation in 3GPP
What is 3GPP?
3rd Generation Partnership Project
Established in 1998
A collaboration agreement between numerous telecommunication standardisation bodies
Aims to maintain and develop GSM and 3rd Generation Mobile Systems by providing Technical Specifications (TSGs)
Functional entities to support MBMS
Minimum number of changes to existing infrastructure
User Equipment: UE
Radio Access Network: UTRAN/GERAN
Serving GPRS Support Node (SGSN )
Gateway GPRS Support Node (GGSN)
Broadcast-Multicast Service Centre: BM-SC
The multicast mode
First the user starts a relationship with the operator by subscribing to a spesific MBMS service
After subscription the user may receive related MBMS service and operator may charge for it
Subscription can be made for example in the internet
Conclusions and possible service solutions
IP multicast traffic can be received by mobile subcscribers already: However, IP multicast is transparent to UMTS system and ptp connection between each UE and GGSN is used.
MBMS is transparent to end users (they have same experience as with ptp connections) but saves resources on the mobile operator side: optimization of the radio access
For example in a sports event, playbacks can be broadcasted to all audience UEs automatically
Operators can use MBMS to inform about new services