I’m trying to do a 5G-only network scan with a EM9191 module, running firmware 03.04.03.00 GENERIC_030.012_000.
I’ve configured all 5G bands in the module:
AT!BAND=0C OK AT!BAND? Index, Name 0C, NR5G ALL OK
And I was hoping that triggering a standard network scan, it would return the list of available 5G networks in the area, but instead I’m getting an error:
AT+COPS=? +CME ERROR: operation not allowed
Using QMI and “NAS Network Scan” also fails:
$ sudo qmicli -d /dev/cdc-wdm0 -p --nas-network-scan error: couldn't scan networks: QMI protocol error (70): 'InvalidOperation'
There doesn’t seem to be any 5G around as the module doesn’t report anything in NRINFO:
AT!NRINFO? !NRINFO: Connectivity Mode: --- Connectivity Mode: --- Cell ID: --- NR5G band: --- Carrier Index: --- NR5G dl bw: --- NR5G ul bw: --- NR5G Rx chan: --- NR5G Tx chan: --- NR5G dl MIMO: --- NR5G ul MIMO: --- NR5G(sub6) RxM RSSI (dBm): --- NR5G(sub6) RxD RSSI (dBm): --- NR5G(sub6) RxM1 RSSI (dBm): --- NR5G(sub6) RxD1 RSSI (dBm): --- NR5G(mmw) Rx0 RSSI (dBm): --- NR5G(mmw) Rx1 RSSI (dBm): --- NR5G RSRP (dBm): --- NR5G RSRQ (dB): --- NR5G SINR (dB): --- OK
But I hoped I would at least get an empty returned list instead of an error. What’s the correct way to perform a 5G-only network scan?
I’m probably mistaken or missing something. For 5G NSA EN-DC, I understand the LTE anchor is first required, so LTE bands would have been needed. But if I configure only 5G bands, wouldn’t I be able to search for 5G SA networks?
BTW, the module is configured to select any access tech, I didn’t change that. I only change the selected bands:
$ sudo qmicli -d /dev/cdc-wdm0 -p --nas-get-system-selection-preference [/dev/cdc-wdm0] Successfully got system selection preference Emergency mode: 'no' Mode preference: 'umts, lte, 5gnr' Disabled modes: 'none' Band preference: 'none' LTE band preference: 'none' LTE band preference (extended): '' NR5G SA band preference: '1, 2, 3, 5, 28, 41, 66, 71, 77, 78, 79' NR5G NSA band preference: '1, 2, 3, 5, 28, 41, 66, 71, 77, 78, 79' TD-SCDMA band preference: 'none' Roaming preference: 'any' Network selection preference: 'automatic' Service domain preference: 'cs-ps' GSM/WCDMA acquisition order preference: 'automatic' Usage preference: 'data-centric' Voice domain preference: 'ps-preferred' Registration restriction: 'unrestricted' Acquisition order preference: 'lte, 5gnr, umts'