Its main value is how it anchors the later BR SI branch.
Important Information Elements
IE
Required
Description
SystemInformationBlockType1-BR-r13
Yes
Carries the BR-specific first system-information block.
Detailed field explanation
SystemInformationBlockType1-BR-r13
Carries 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.
What to check in logs and traces
Check that it appears before later System Information BR.
Use it to interpret how the later BR SI branch is scheduled or updated.
Common Issues and Troubleshooting
The UE cannot move from the initial broadcast anchor into later BR-specific system information.
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.
FAQ
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.
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.
