CCCH

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Eric Cathelinaud e.cathelinaud at googlemail.com
Wed Jul 15 10:56:30 UTC 2009


2009/7/15 Dieter Spaar <spaar at mirider.augusta.de>

> 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
>

Thanks a lot for the explanation. It's a pity that the minimum period is 2
multiframes. I wish I could realize a paging on a mobile phone every frame
but it seems to be impossible finally.

Best regards,
Eric Cathelinaud
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