Hi everyone,
I’m using a custom board (a tracker) that can travel at speeds up to 65 km/h and transmits data regularly every 200 ms. I expect, therefore, that the inactivity timer should not be activated. While the device is in motion, I’m seeing intermittent data gaps ranging up to several seconds, which is unacceptable for our application.
Could this be caused by non-optimal cell-handover settings? I’ve attached a few logs below for reference.
Any suggestions would be greatly appreciated.
Thanks,
Martin
Three log fragments examples, related to data send drops:
17:31:57.179 +CSCON: 0
17:31:57.230 <inf> main: RRC mode: Idle
17:31:57.276 +CEREG: 1,"04D3","0DBC2351",7,,,"11100000","11100000"
17:31:57.298 <inf> main: Cell update, cell tac: 1235, cell id: 230433617
17:31:57.371 +CSCON: 1
17:31:57.429 <inf> main: RRC mode: Connected
17:31:57.539 +CSCON: 0
17:31:57.568 <inf> main: RRC mode: Idle
17:31:57.907 +CSCON: 1
17:31:57.926 <inf> main: RRC mode: Connected
***
17:37:54.095 +CEREG: 1,"04D3","0DC18750",7,,,"11100000","11100000"
17:37:54.154 [00:54:10.770,263] <inf> main: Cell update, cell tac: 1235, cell id: 230786896
***
17:38:05.373 +CEREG: 1,"04D3","0DDD4350",7,,,"11100000","11100000"
17:38:05.434 <inf> main: Cell update, cell tac: 1235, cell id: 232604496
***
Modem firmware: mfw_nrf91x1_2.0.2
Current 9161 modem initiation sequence is:
AT+CFUN=0
AT%XSYSTEMMODE=1,0,0,0
AT+CPSMS=0
AT+CEDRXS=0
AT%RAI=0
AT+CSCON=1
AT+CEREG=5
AT+CFUN=1
