Cisco Cisco Packet Data Gateway (PDG) Guida Alla Risoluzione Dei Problemi
Multimedia Broadcast and Multicast Service
▀ Services and Application in MBMS
▄ Cisco ASR 5000 Series Enhanced Feature Configuration Guide
OL-22983-01
MBMS UE Context
A MBMS UE context is defined per UE. Session Manager assign a separate context structure for a MBMS UE Context.
Session Manager maintains the following information as part of MBMS UE Context:
IP multicast address: IP multicast address identifying an MBMS bearer that the UE has joined.
APN: Access Point Name on which this IP multicast address is defined.
SGSN address: The IP address of SGSN
IMSI: IMSI identifying the user.
TEID for Control Plane: The Tunnel Endpoint Identifier for the control plane between SGSN and GGSN.
MBMS NSAPI: Network layer Service Access Point Identifier which identifies an MBMS UE Context.
Important:
For capacity and resource purpose one MBMS UE context is equal to one PDP
context.
MBMS Bearer Context
The MBMS bearer context is created in the SGSN and GGSN for each provisioned MBMS service. This is created
when the first MS requests for this service or when a downstream node requests it. Once created, an MBMS context can
be in two states:
when the first MS requests for this service or when a downstream node requests it. Once created, an MBMS context can
be in two states:
Active - is the state in which network resources are required for the transfer of MBMS data.
Standby - is the state in which no network resources are required.
The MBMS Bearer Context contains all information describing a particular MBMS bearer service and is created in each
node involved in the delivery of the MBMS data.
node involved in the delivery of the MBMS data.
Broadcast Multicast Service Center (BM-SC)
The BM-SC includes functions for MBMS user service provisioning and delivery. It serves as an entry point for content
provider MBMS transmissions, used to authorize and initiate MBMS Bearer Services within the PLMN. It can also be
used to schedule and deliver MBMS transmissions.
provider MBMS transmissions, used to authorize and initiate MBMS Bearer Services within the PLMN. It can also be
used to schedule and deliver MBMS transmissions.
The BM-SC consists of five sub-functions:
Membership function
Session and Transmission function
Proxy and Transport function
Service Announcement function
Security function.
BM-SC is a functional entity and must exist for each MBMS User Service.