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nrf9160 power consumption in PS

Mmcharfi

Hello,

I am curently working on project with a nrf9160. I will use the nrf9160 as modem controled by a nrf52840 and command AT. I will send data true GSM every 12 hours.

I need to estimate the life of my porduct on batterie and for that i try to estimate the average power consumption of my system. Firstly i used the online power profile, I start to simulate with LTEM, no PSM, no RRC Idle mode and upload 100 byte of data. I have en average power consumption of 2.2mA.

After i take a look on the nrf9160_PS_V2.0 Modem current consumption, and i was litlle bit confusing with the value indicate in "Average current consumption, radio resource control (RRC) mode, Cat-M1".

For example, the Irmc_23dbm for B13 indicate 190mA. Is this represent the average power comsumption of the modem when we uplink data ? If yes why such a difference with the results that i have with the online power profiler ?

I need to consider the worst case for my estimation, do i need to use the power profiler or the value in the PS ?

Many thanks,

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    Hello,

    What is stated in the PS is the subframe (TX/RX parameter), so that tells the current usage in the moment it transmits sate or communicates with the network. When it is don then the modem will most likely go into DRX mode( DRX is also in RRC connected mode),  that means that it will listen to the network in intervals. that interval(cDRX) can be configured in OPP. 

    If the network dos not support DRX then the modem will be in RX mode constantly. RX consumes around 45mA. it is stated in the following line in the PS:
     

    IRX_-90DBM RX subframe, Pin -90 dBm 45 45 45 45 mA


    So that would give you a worst case scenario  of 45mA, in the case of no form of power saving(DRX).
     

    The number you refer to is TX/RX subframe and it is mostly TX(80%) so that is why the current is so high. 

    Pout 23 dBm, BPSK, 1SC, 3.75 kHz, TX 80% RX 10% ("TX intensive"), 
RMC settings as per 3GPP TS 36.101 Annex A.2.4


    Regards,
    Jonathan

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  • 0

    Hello,

    What is stated in the PS is the subframe (TX/RX parameter), so that tells the current usage in the moment it transmits sate or communicates with the network. When it is don then the modem will most likely go into DRX mode( DRX is also in RRC connected mode),  that means that it will listen to the network in intervals. that interval(cDRX) can be configured in OPP. 

    If the network dos not support DRX then the modem will be in RX mode constantly. RX consumes around 45mA. it is stated in the following line in the PS:
     

    IRX_-90DBM RX subframe, Pin -90 dBm 45 45 45 45 mA


    So that would give you a worst case scenario  of 45mA, in the case of no form of power saving(DRX).
     

    The number you refer to is TX/RX subframe and it is mostly TX(80%) so that is why the current is so high. 

    Pout 23 dBm, BPSK, 1SC, 3.75 kHz, TX 80% RX 10% ("TX intensive"), 
RMC settings as per 3GPP TS 36.101 Annex A.2.4


    Regards,
    Jonathan

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