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# Paging group calculation

• This topic has 13 replies, 1 voice, and was last updated 8 years, 8 months ago by Deepak.
Viewing 14 posts - 1 through 14 (of 14 total)
• Author
Posts somnath dutta
Guest

With some IMSI value,CCCH_CONFIG=0,BS_AG_BLK_RES=1,BS_PA_MFRMS=4,how to calculate the actual paging group?I want the actual value of the paging group.Plz help. Garry
Guest

32 paging groups with non combined and 8 with combined. somnath dutta
Guest

No I want the actual paging group which is assigned for me.That means how to calculate the actual paging group based on my IMSI/TMSI which is assigned to me. pix
Guest

there’s a formula, that you can find in a 3GPP document.
http://www.3gpp.org somnath
Guest

Actually I have tried to calculate the same using that formula…but there Im facing some prob where mod value is returning a ‘0’…which is meaningless…so I feel Im doing some mistake somewhere.So can you help? pix
Guest

yes, but you’ll have to give me the formula, so i can give it a try. No time to look for the formula by myself, sorry… somnath
Guest

pagging_group(0….N-1)= (IMSI mod 1000)mod N

N=(no of CCCH group in a multiframe-no of blk for AGCH)*no of multiframe between pagging
for instance no of CCCH blk available=9,AGCH blobked=1,
no of pagging between multiframe=4

plz help pix
Guest

IMSI mod 1000 –> gives you the 3 last digits of the IMSI

3 last digits mod 48 –> in excel, type the formula
“=MOD(3digits;48)”

why 48 : because (9-1)x4 = 48

the result is the value of the paging group…

regards,
pix somnath
Guest

It will be 32 instead of 48 because
(9-1)*4=32 pix
Guest

what a shame… thx somnath, i’m doing really stupid mistakes sometimes ! :))

i was even wondering how come a “modulo 48” was used, while there is about 20 to 30 paging groups normally… never crossed my mind that 8×4 = 32. anh
Guest

Let say, we have 100 IMSIs belonging to paging group No.2
With paging request type 3 (4 MS per paging msg), how will these 100 IMSIs be paged?

Thanks, pix
Guest

hi,
these Ms will be paged by their TMSI, if the MSC has allocated a TMSI to these MS, and if the “TMSI paging” method is defined in the MSC.

regards
pix Mick
Guest

In case of Paging Request Type the mobile stations are identified by their TMSIs (TS 04.08) Deepak
Guest

CCCH-CONF Value tells,Whether you are using COMBINED or NON-COMBINED Configuration.
I dont remember exactly, What exactly CCCH_CONFIG=0 stands for.

First lets Consider COMBINED config

COMBINED : Total CCCH = 9
BS_AG_BLK_RES=1
So Channels reserved for Pagig = 9-1 = 8

BS_PA_MFRMS=4 : This tells After how many multiframes paging group repeats.

So total Paging groups = 8*4 = 32

Lets IMSI Value = x

Paging Group for a particular Mobile =

(x MOD 1000) MOD 32 where 32 is total Paging Groups.

e.g. if IMSI = 404685505601234
Paging Group = (404685505601234 MOD 1000)MOD32
i.e. => 234 MOD 32 => 10

Paging Group = 10.

NON-COMBINED:

Total CCCH = 3
BS_AG_BLK_RES=1
So Channels reserved for Pagig = 3-1 = 2

BS_PA_MFRMS=4
So total Paging groups = 2*4 = 8

Paging Group = (IMSI MOD 1000)MOD 8

e.g
404685505601234 MOD 1000 MOD 8
=> 234 MOD 8 = 2
Paging Group = 2

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