5G • RAN
SI-RNTI
System Information RNTI
Fixed 16-bit RNTI (0xFFFF) used to scramble PDCCH scheduling System Information Blocks (SIB1 and OSI).
Technical Explanation
SI-RNTI has a fixed value of 0xFFFF. The UE monitors Type0-PDCCH CSS (for SIB1) and Type0A-PDCCH CSS (for OSI) using SI-RNTI. Decoding a DCI scrambled with SI-RNTI provides the frequency allocation and modulation used to read broadcast system information on PDSCH.
Key Functions
- Fixed 16-bit identifier (0xFFFF) for system information scheduling
- Monitored in Type0 and Type0A Common Search Spaces
- Schedules PDSCH resources delivering SIB1 (RMSI) and OSI blocks
Specifications
3GPP TS 38.212, TS 38.331
Interfaces
Uu
Related 5G Concepts
Want to memorize 5G concepts like this one?
Study it with SuperMemo SM-2 spaced repetition flashcards.