What is System Information BR r13 in LTE?
It is the LTE broadcast system-information container used for later BR-specific system information.
| Protocol | lte-rrc | Network | lte |
|---|---|---|---|
| Spec | 3GPP TS 36.331 | Spec Section | 5.2.2, 6.2.2 |
| Direction | Broadcast | Message Type | Broadcast System Information |
| Full message name | LTE RRC System Information BR r13 |
|---|---|
| Protocol | LTE-RRC |
| Technology | LTE |
| Direction | Broadcast |
| Interface | Uu |
| Signaling bearer / channel | Broadcast / BCCH-DL-SCH |
| Typical trigger | Read by the UE after BR-specific broadcast anchoring. |
| Main purpose | Delivers later BR-specific system information after the UE has already acquired the earlier broadcast anchors. |
| Main specification | 3GPP TS 36.331, 5.2.2, 6.2.2 |
| Release added | Release 13 |
| Procedures where used | BR system information acquisition |
Broadcast LTE RRC message carrying bandwidth-reduced system information.
Delivers later BR-specific system information after the UE has already acquired the earlier broadcast anchors.
System Information BR r13 is the later LTE broadcast system-information container for BR-specific operation.
Call flow position: Later broadcast block read after earlier BR-specific broadcast anchoring.
Typical state: The UE is collecting the BR-specific system information needed for later operation.
Preconditions:
Next likely message: Later BR-specific idle or access continuation
Call flow position: Broadcast read step used when BR-specific system information needs refreshing.
Typical state: The message updates BR-specific broadcast context rather than dedicated connected-mode state.
Preconditions:
Next likely message: Updated BR-specific continuation
Previous message(s): SystemInformationBlockType1-BR-r13
Next message(s): Later BR-specific idle or access handling
Security context: Broadcast information
SystemInformation-BR-r13 ::= SEQUENCE {
criticalExtensions CHOICE {
c1 CHOICE {
systemInformation-BR-r13 SystemInformation-BR-r13-IEs,
spare3 NULL,
spare2 NULL,
spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}
Read it as the BR-specific later system-information container.
BCCH-DL-SCH-Message
message c1 : systemInformation-BR-r13 : present
| IE | Required | Description |
|---|---|---|
SystemInformation-BR-r13 | Yes | Carries BR-specific later system information content. |
SystemInformation-BR-r13Carries BR-specific later system information content.
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 later BR system-information branch may be missing, stale, or not reacquired.
What to inspect: Check whether System Information BR r13 appears after the earlier BR broadcast anchor.
Next step: Treat it as BR-specific system-information acquisition troubleshooting.
It is the LTE broadcast system-information container used for later BR-specific system information.
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.