| Protocol | lte-rrc | Network | lte |
|---|---|---|---|
| Spec | 3GPP TS 36.331 | Spec Section | 5.8, 6.2.2 |
| Direction | eNodeB -> UE | Message Type | MBMS Broadcast Control |
| Full message name | LTE RRC MBSFN Area Configuration r9 |
|---|---|
| Protocol | LTE-RRC |
| Technology | LTE |
| Direction | eNodeB -> UE |
| Interface | Uu |
| Signaling bearer / channel | BCCH / DL-DCCH context dependent / Configuration delivery for MBMS handling |
| Typical trigger | Triggered when the network needs to configure or update an MBSFN area branch. |
| Main purpose | Carries MBMS area-related configuration so the UE can interpret and receive MBMS services in the configured MBSFN area. |
| Main specification | 3GPP TS 36.331, 5.8, 6.2.2 |
| Release added | Release 9 |
| Procedures where used | MBMS configuration |
Downlink LTE RRC message used to deliver MBSFN area configuration to the UE.
Carries MBMS area-related configuration so the UE can interpret and receive MBMS services in the configured MBSFN area.
MBSFN Area Configuration r9 is the LTE message that tells the UE how the MBMS area is configured.
Call flow position: Network message used to configure MBMS area context for the UE.
Typical state: The UE is receiving MBMS-related area information needed for later service interpretation.
Preconditions:
Next likely message: Later MBMS continuation
Call flow position: Configuration message used when the MBMS area branch changes.
Typical state: The message updates MBMS broadcast context instead of starting a dedicated failure or mobility branch.
Preconditions:
Next likely message: Updated MBMS service reception handling
Previous message(s): SystemInformationBlockType13
Next message(s): Later MBMS service continuation
Security context: Read it as configuration delivery rather than a failure or recovery message.
MBSFNAreaConfiguration-r9 ::= SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
mbsfnAreaConfiguration-r9 MBSFNAreaConfiguration-r9-IEs,
spare3 NULL,
spare2 NULL,
spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}
The useful read is the MBMS area context being delivered or updated.
DL-DCCH-Message
message c1 : mbsfnAreaConfiguration-r9 : {
criticalExtensions c1 : mbsfnAreaConfiguration-r9 : {
mbsfn-AreaInfoList-r9 present
}
}
| IE | Required | Description |
|---|---|---|
mbsfn-AreaInfoList-r9 | Yes | Carries the configured MBSFN area information. |
mbsfn-AreaInfoList-r9Carries the configured MBSFN area information.
Presence: Required
In practice: In practice, compare this field with the original request and with any later release-dependent optional fields so you can see whether the network accepted the same service model the UE asked for.
Likely cause: The relevant MBSFN area configuration may be missing, outdated, or misunderstood.
What to inspect: Check whether MBSFN Area Configuration r9 appears and what area context it delivers.
Next step: Treat it as MBMS area-configuration analysis rather than normal LTE dedicated signaling troubleshooting.
It is the LTE RRC message used to deliver MBMS MBSFN area configuration to the UE.
Decode this message with the 3GPP Decoder, inspect the related message database, or open the matching call flow to see where this signaling step fits in the full procedure.