LTE RRC System Information MBMS r14

Message Fact Sheet

Protocol	lte-rrc	Network	lte
Spec	3GPP TS 36.331	Spec Section	5.8, 6.2.2
Direction	Broadcast	Message Type	Broadcast System Information

Full message name	LTE RRC System Information MBMS r14
Protocol	LTE-RRC
Technology	LTE
Direction	Broadcast
Interface	Uu
Signaling bearer / channel	Broadcast / BCCH-DL-SCH
Typical trigger	Read by the UE after MBMS-specific broadcast anchoring.
Main purpose	Delivers MBMS-specific later system information after the UE acquired the earlier MBMS broadcast anchors.
Main specification	3GPP TS 36.331, 5.8, 6.2.2
Release added	Release 14
Procedures where used	MBMS system information acquisition

What is LTE RRC System Information MBMS r14 in simple terms?

Broadcast LTE RRC message carrying later MBMS-specific system information.

Delivers MBMS-specific later system information after the UE acquired the earlier MBMS broadcast anchors.

Why this message matters

System Information MBMS r14 is the later MBMS-specific LTE system-information container.

Where this message appears in the call flow

MBMS later system-information acquisition

LTE flow showing System Information MBMS r14 acquired after the earlier MBMS anchor — After the early MBMS anchor, the UE reads System Information MBMS r14 to continue the MBMS broadcast branch.

Call flow position: Later MBMS system-information block read after the earlier MBMS anchor.

Typical state: The UE is collecting MBMS-specific SI needed for later service interpretation.

Preconditions:

The UE already acquired the earlier MBMS broadcast anchor.

Next likely message: Later MBMS continuation

MBMS broadcast-change handling

LTE flow showing System Information MBMS r14 refresh after an MBMS broadcast change — The same later MBMS system-information container is used again when the MBMS broadcast branch changes.

Call flow position: Refreshed MBMS system-information read when the MBMS broadcast branch changed.

Typical state: The message updates MBMS broadcast context rather than connected-mode dedicated state.

Preconditions:

An MBMS broadcast context exists.

Next likely message: Updated MBMS continuation

Call flow position

Previous message(s): SystemInformationBlockType1-MBMS-r14

Next message(s): Later MBMS service continuation

Message direction and transport

Sender and receiver: Broadcast

Interface: Uu

Domain: Access-side broadcast control for MBMS

Signaling bearer: Broadcast

Logical channel: BCCH-DL-SCH

Transport / encapsulation: LTE broadcast system information

Security context: Broadcast information

Message Structure Overview

SystemInformation-MBMS-r14 is the later MBMS-specific system-information container.

ASN.1 for LTE RRC System Information MBMS r14

SystemInformation-MBMS-r14 ::= SEQUENCE {
  criticalExtensions CHOICE {
    c1 CHOICE {
      systemInformation-MBMS-r14 SystemInformation-MBMS-r14-IEs,
      spare3 NULL,
      spare2 NULL,
      spare1 NULL
    },
    criticalExtensionsFuture SEQUENCE {}
  }
}

How to read this ASN.1

Read it as the later MBMS system-information container after the earlier MBMS anchor.

LTE RRC System Information MBMS r14 - Example Dump

BCCH-DL-SCH-Message
  message c1 : systemInformation-MBMS-r14 : present

How to read this dump

The useful read is how it extends the MBMS broadcast branch after the earlier anchors.

Important Information Elements

IE	Required	Description
`SystemInformation-MBMS-r14`	Yes	Carries later MBMS-specific system information.

Detailed field explanation

`SystemInformation-MBMS-r14`

Carries later MBMS-specific system 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.

What to check in logs and traces

Check that the earlier MBMS anchor was already acquired.
Compare the message with later MBMS service behavior.

Common Issues and Troubleshooting

The UE reaches early MBMS broadcast acquisition but not the later MBMS information branch.

Likely cause: System Information MBMS r14 may be missing, stale, or not reacquired.

What to inspect: Check whether the message appears after the earlier MBMS anchor.

Next step: Treat it as MBMS-specific system-information acquisition troubleshooting.

FAQ

What is System Information MBMS r14 in LTE?

It is the later MBMS-specific LTE system-information container used after the earlier MBMS broadcast anchors.

Related message pages

Related Procedures

Related Tools

Use This Reference in Practice

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.