What is System Information Block Type 1 BR r13 in LTE?
It is the first BR-specific LTE system-information block that points the UE to later BR 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 SIB1 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 the earliest BR-compatible broadcast anchor. |
| Main purpose | Provides the BR-specific broadcast anchor that tells the UE how to continue BR-oriented system-information acquisition. |
| 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 the first BR-specific system-information block.
Provides the BR-specific broadcast anchor that tells the UE how to continue BR-oriented system-information acquisition.
SIB1 BR r13 is the first BR-specific system-information block the UE reads before later BR system information.
Call flow position: Early BR-specific system-information block read after the earliest broadcast anchor.
Typical state: The UE learns how to continue BR-specific system-information acquisition.
Preconditions:
Next likely message: System Information BR r13
Call flow position: Refreshed BR-specific anchor read when later BR system information may have changed.
Typical state: The message anchors the BR system-information reacquisition path.
Preconditions:
Next likely message: Updated System Information BR r13
Previous message(s): MasterInformationBlock
Next message(s): SystemInformation-BR-r13
Security context: Broadcast information
SystemInformationBlockType1-BR-r13 ::= SEQUENCE {
...
}
Read it as the first BR-specific SI block that points the UE to later BR system information.
BCCH-DL-SCH-Message
SystemInformationBlockType1-BR-r13: present
| IE | Required | Description |
|---|---|---|
SystemInformationBlockType1-BR-r13 | Yes | Carries the BR-specific first system-information block. |
SystemInformationBlockType1-BR-r13Carries the BR-specific first system-information block.
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: SIB1-BR may be missing, stale, or not reacquired correctly.
What to inspect: Check whether SIB1 BR r13 is present and whether later System Information BR follows.
Next step: Treat it as BR broadcast anchoring analysis.
It is the first BR-specific LTE system-information block that points the UE to later BR 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.