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I'm working with GSM modem and I'm wondering if anyone has come across any sort of measured or typical GSM current profiles for various actions such as:

  • Connecting to base station
  • Sending a SMS
  • Voice call
  • During an active data connection

I know the general trend of what the current consumption should look like when it is transmitting based upon frame rate and slot-time, what I'm looking for is more coarse view. For example when sending a SMS message it transmits for N number of slots.

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2 Answers

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I used some generic modules, so here are some values to work with:

  • voice call: 250 - 300 mA (unactive unused bursts: 20 - 50 mA)
  • GPRS (2Tx, 3Rx slots): 340 - 410 mA

This assumes having a matched antenna. The current consumption itself depends on the transmitted power and is thus dependend on the network. If you have a highly unmatched antenna, a voice call can draw up to 2500 mA.

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What chipset were you using? – Kortuk♦ Jun 2 '12 at 16:23
@Kortuk LEON-G200 – suha Jun 2 '12 at 18:10
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I meant that it is probably worth placing that in the answer. Did the datasheet for the chipset not give you this information? – Kortuk♦ Jun 3 '12 at 10:19
@Kortuk It did in some part. – suha Jun 3 '12 at 11:53
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Siemens, some time ago, made many GSM modules widely by machine-to-machine systems, like TC25, TC35, TC65, with very detailed technical data manuals. Some has good graphs showing the current rise time and peak duration, etc.

Try search, like http://www.op5.com/manuals/extras/op5_TC65_GSM_module_manual.pdf

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