5G connection establishment

Sebastian Sjöholm sebastian.sjoholm at gmail.com
Tue Sep 29 03:37:49 UTC 2020


When using NSA (ENDC) the anchor will always be LTE, so for the modem LTE will be the primary network.

The NR will only be used for the user plane, and activated only during data session, but even during data session signalling (control plane) will be on LTE.

Depending on network setup, the NR session will be disconnected right after the data session. At some it can be instant, other might have longer timeouts.

On RM500 you can check with at+qeng=”servingcell” and on SIM8200 at+cpsi? to see if the additional NR cell is connected after or during data session.



> On 29 Sep 2020, at 00:21, Nick B <nickberry17 at icloud.com> wrote:
> Hey,
> Just for the record, I am having the excat same experience in Australia with at Quectel RM500Q-GL and SIMCOM SIM8200EA-M2.  Is there any debugging info that would be helpful?
> Best,
> Nick
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