CCCH

[Dieter Spaar]

Hello Eric,

On Wed, 15 Jul 2009 11:00:14 +0200, "Eric Cathelinaud" <e.cathelinaud at googlemail.com> wrote:
>
> I was just thinking about performing a recursive paging in order to see how
> much time I have until the battery of a mobile phone run out.
> Does anyone know if the mobile phone answers at every paging or if it
> doesn't "listen" all the time? I think it listens periodically. If anyone
> can give me a clue, that would be appreciated.

This is an excerpt from a posting to another mainling list, I just
quote it because I don't want to repeat what I already wrote:

>  - The phone is in "idle" mode (no speech/data traffic)
>    and periodically receives the paging channel (PCH) to
>    find out if its being called. Further the phone measures
>    the signal strength of neighbor cells and every now
>    and then (not that frequent as the above actions)
>    receives the cell information in the broadcast common
>    control channel (BCCH) of the serving cell and of
>    at most six neighbor cells with the strongest signal.

....

>  - The time between receiving the PCH is determined by a
>    parameter of the serving cell (BS_PA_MFRMS, range 2 to 9).
>    Its measured in 51-multiframes until the PCH for the phone
>    repeats (if you want to know the details have a look at
>    the GSM specs  ;-) . The length of a 51-multiframe is
>    235.8 ms, this means the time between receiving the PCH
>    is in the range 471.9 ms to 2122.2 ms. In this time the
>    idle phone most of the time sleeps or receives the BCCH
>    of the serving cell or one of the neighbor cells with
>    the strongest signal (at most six).

Best regards,
  Dieter
-- 
Dieter Spaar, Germany                           spaar at mirider.augusta.de