Cisco Cisco Packet Data Gateway (PDG) Guida Alla Risoluzione Dei Problemi
Multimedia Broadcast and Multicast Service
How MBMS Works ▀
Cisco ASR 5000 Series Enhanced Feature Configuration Guide ▄
OL-22982-01
Figure 40. Basic Procedure of MBMS Multicast Mode
MBMS capable
radio network
(GERAN/UTRAN)
MBMS enabled GGSN/
PS Core Network
QoS handling,
multicast area
control, provisioning
control, subscription
control, subscription
handling, activation
etc.
Multimedia services
Operator’s services
IP network
Services (news, sport,
results, video etc.)
MBMS capable
radio network
(GERAN/UTRAN)
- Service Synchronization
- User initiated activation
- Multicast data
SGSN
SGSN
A multicast service might consist of a single on-going session or may include several simultaneous multicast sessions
over and extended period of time.
over and extended period of time.
Some example of multicast mode service are:
transmission of sports video clips to subscribers on charging basis
transmission of news, movie, song, and audio clips to subscribed users on charging basis
MBMS Multicast Mode Procedure
The MBMS performs following steps for multicast mode user service:
Step 1
Subscription: Establishes the relationship between the user and the service provider, which allows the user to receive the
related MBMS multicast service.
related MBMS multicast service.
Step 2
Service Announcement: Through the service announcement mechanisms like, SMS, WAP, users shall be informed
about the available MBMS services.
about the available MBMS services.
Step 3
Joining: This is the process by which a subscriber joins a multicast group, i.e. the user indicates to the network that
he/she wants to receive Multicast mode data of a specific MBMS bearer service.
he/she wants to receive Multicast mode data of a specific MBMS bearer service.
Step 4
Session Start: This is the phase where BM-SC is ready to send data and this triggers establishment of network resources
for data transfer irrespective of whether a given user has activated the service or not.
for data transfer irrespective of whether a given user has activated the service or not.
Step 5
MBMS Notification: Notifies the MS of a impending MBMS data transfer.
Step 6
Data Transfer: It is the phase when MBMS data are transferred to the UEs.