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Eric Cathelinaud e.cathelinaud at googlemail.com2009/7/15 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/openbsc/attachments/20090715/40a9f70b/attachment.htm>