Bug #1024 (oscillating re-camping), a possible solution.

Dieter Spaar spaar at openmoko.org
Tue May 26 12:45:03 CEST 2009


David Garabana Barro wrote:
> Dima: Could you please make any tests on battery life with and without 
> calypso_deep_sleep?

Just a note: The time how long the GSM modem can go into "Deep Sleep"
is mainly determined by a parameter of the cell. Its the BS_PA_MFRMS,
parameter, range 2 to 9, which translates to about 471.9 ms to 2122.2 ms
of time between receiving the PCH. The possible "Deep Sleep" time is
shorter because of the overhead for waking up, receiving the burst and so
on. Please keep this in mind when doing a test, it depends on the cell too.
You can query this cell parameter with "AT%EM=2,4", its the first number
of the result.

Best regards,

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