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5G Fundamentals
Radio Network Temporary Identifiers allow the gNB scheduler to address individual UEs and identify different transmission types on the 5G NR air interface. Each RNTI is embedded in the CRC field of the Downlink Control Information carried on the PDCCH. A UE monitors the PDCCH by attempting to decode DCI candidates using its assigned RNTI values and only processes a message when the CRC check passes. This elegant mechanism lets multiple UEs share the same search space while each responds only to its own scheduling grants, system information broadcasts, or paging notifications.
Try these first, even if you're not sure. Guessing primes your brain.
Many phones share one cell's control channel. How does one phone know a grant is for it?
System info and paging must reach all phones in a cell. Should those use per-phone IDs?
A phone goes idle after heavy downloads. Should it keep its dedicated short ID forever?
Answer all 3to continue — it's OK to be wrong.