Hello Eric,
On Wed, 15 Jul 2009 11:00:14 +0200, "Eric Cathelinaud" e.cathelinaud@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
2009/7/15 Dieter Spaar spaar@mirider.augusta.de
Hello Eric,
On Wed, 15 Jul 2009 11:00:14 +0200, "Eric Cathelinaud" < e.cathelinaud@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@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
Hi,
Finally I think I find a solution to make the cell phone listening to every frames of the CCCH.
On Thursday 16 July 2009 15:44:21 Eric Cathelinaud wrote:
Hi,
parameter. I saw that the paging group is calculated from the IMSI. And then the paging block is calculated. Is it calculated in the BTS or in OpenBSC?
See paging.c in the source code for formatting the paging request (and calculating the group)
z.
-
Dieter Spaar -
Eric Cathelinaud -
Holger Freyther