RE: fota dowload and a-gps run in parallel

Øyvind — Mon, 11 Jul 2022 06:32:49 GMT

From the description you have provided, you want to run A-GPS while the FOTA is ongoing. This is not possible as the GPS cannot be active while the LTE connection is active. You application must finish the LTE connection and enter PSM before A-GPS can be active.

RE: fota dowload and a-gps run in parallel

Praveen Deshmane — Mon, 11 Jul 2022 05:36:55 GMT

Hi Øyvind,

I am still unable to understand, is there any sample code?

RE: fota dowload and a-gps run in parallel

Øyvind — Wed, 06 Jul 2022 07:57:23 GMT

Hello,
the DevZone team and Nordic Semiconductor are currently entering summer vacation period, some delays in answers must be expected due to lower staffing during this period. We apologize for the inconvenience.

The GPS operation of the nRF9160 is time multiplexed with LTE modem, and it is possible to use the GPS and QZSS receiver to obtain position either while the LTE is in RRC Idle mode or power saving mode (PSM), or when the LTE modem is completely deactivated. Read more in the GPS Receiver chapter in nRF9160 Product Specification

From the Practical considerations in the nRF Cloud A-GPS library documentation

When A-GPS data is downloaded using LTE network, the LTE link is in RRC connected mode. The GNSS module can only operate when the device is in RRC idle mode or Power Saving Mode (PSM). The time to go from RRC connected mode to RRC idle mode is network-dependent. This time is usually not controlled by the device and is typically in the range of 5 to 70 seconds. If the GNSS module has already started before the device enters the RRC idle mode, this RRC inactivity may make TTFF appear longer than the actual time spent searching for the GNSS satellite signals.

Hopes this clears the confusion.

Kind regards,
Øyvind