Real-world stories from the Private Cellular Network ecosystem — the challenges enterprises and operators faced, how they were solved, and the results. Drawn from deployments and device interoperability work across the ODA community.
Apple's move to its in-house C1 baseband modem, replacing the Qualcomm modems used in previous iPhones, changed how the newest iPhones negotiate their PDCCH control-channel configuration on 5G standalone networks. In a Private 5G deployment, the iPhone 16e and iPhone Air would not attach, while Qualcomm-based handsets on the same network connected normally. The root cause was a single CORE SET parameter that the C1 modem interprets more strictly than its predecessors. The resolution was a network-side RRC configuration change, with no iPhone firmware, SIM, or hardware modification required.
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