Cannot connect to LTE after trying to disconnect/reconnect 30 times

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

sheldon_b — Thu, 17 Mar 2022 21:15:08 GMT

Is there a way to know that you have been throttled other than preventative measures? Waiting for the registration to timeout is very energy intense.

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

jlangballeswift — Wed, 06 Nov 2019 14:12:01 GMT

I'm getting the same issue but I'm disconnecting and reconnecting every 30 minutes, so it takes 15 hours to reach the 30 ATTACH limit. The pdf there says 30 per hour, but I'm doing just 2 per hour, so I thought I wouldn't hit the limit. Is this a bug in the modem firmware? Is there a way to work around? My use-case is basically getting GPS and pushing to the cloud periodically with a sleep state in-between.

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

arthurkoroghlian — Sun, 03 Nov 2019 05:08:18 GMT

Is the fix for this truly to reset the board after the 30th request ? We are running into the identical issue at the moment.

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

Sigurd — Tue, 15 Oct 2019 19:51:55 GMT

[quote userid="84231" url="~/f/nordic-q-a/53264/cannot-connect-to-lte-after-trying-to-disconnect-reconnect-30-times/215162"]Or is this all regulated within the nRF9160 itself?[/quote]

Correct, it's implemented in the modem firmware. If you power-cycle your board, this counter will also be reset.

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

jgv_sl_bolt — Tue, 15 Oct 2019 19:19:04 GMT

Hmm, but it says 30 per hour? I'm able to bypass it by simply resetting the board and thus going over the limit. Or is this all regulated within the nRF9160 itself?

RE: Cannot connect to LTE after trying to disconnect/reconnect 30 times

Sigurd — Tue, 15 Oct 2019 19:11:08 GMT

Hi,

This is the GSMA specified Radio Policy Manager (RPM) feature which is blocking the ATTACH command. RPM is used for protecting the network from excessive signalling loads in various scenarios. In this case default value 30 is used for PDP Context Activation Requests (TS.34_8.2.4_REQ_010, See page 43 in this pdf)

Edit: There is a bug in modem fw v1.0.x were the PDP Context Activation Requests counter is not reset after 1 hours. This is fixed in modem fw v1.1.0