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18th February 2008 at 18:51 #50858PixGuest
ParaHO, great 🙂 i’m glad i could help. FYI, I don’t know in which 3GPP ref you could find this information…
Pix21st February 2008 at 11:22 #50859RaDiAtEdGuest
waiting for your answer pix, i tried to look for the answer but i couldnt find the significance of 15 seconds anywhere.21st February 2008 at 13:45 #50860PixGuest
Nice nickname ! How do you recognize a good GSM radio engineer ?
Headaches, Hair loss and Sterile :))
More seriously, the answer is in 3GPP 45.008
Chapter 6.6.2 Path loss criteria and timings for cell re selection
ii) b. in case of a cell reselection occurring within the previous 15 seconds in which case the C2 value for the new cell shall exceed the C2 value of the serving cell by at least 5 dB for a period of 5 seconds.
Basically, it means that there is an anti ping-pong mechanism during reselection, which lasts 15s, and applies a 5dB margin to all neighbour cells.
Do you agree ?
Pix22nd February 2008 at 16:46 #50861PixGuest
wow… i got you real quiet now !23rd February 2008 at 07:08 #50862BilalGuest
Next question 🙂23rd February 2008 at 08:18 #50863PixGuest
it’s quite difficult to find questions which are not vendor-dependent…
Let’s go, easy one :
* What is the SACCH periodicity on a Dedicated channel (TCH and SDCCH) ?23rd February 2008 at 09:32 #50864ArsalGuest
Its 120 ms & 235 ms for TCH & SDCCH repectively.
Arsal23rd February 2008 at 14:45 #50865BilalGuest
I think for SDCCH it is 471ms.23rd February 2008 at 15:05 #50866paraHOGuest
The SACCH periodicity SDCCH 470.2ms
The SACCH periodicity TCH 480ms23rd February 2008 at 16:12 #50867pixGuest
and the winner is …
finally, we have a winner !
do you have a question for us ?23rd February 2008 at 18:19 #50868paraHOGuest
Thanks Pix… 🙂
ok…this is hopefully easy-ish question.
LAPDm: there are a number of classes associated with handling for short message service:
How many classes are there and what class reference is given to each?25th February 2008 at 10:54 #50869BilalGuest
I am aware of SAPI 3 only25th February 2008 at 17:17 #50870paraHOGuest
Agree Bilal, SAPI3 is assigned specifically for SMS text.
LAPDm: the classes associated with handling SMS there are:
Six classes and they are Class A to F as set out in e.g.
3GPP TS04.11 v7.1.0 (2000-09) Release 98 or if you want to go back further ETS 300 559: September 1995 (GSM 04.11 version 4.8.0)25th February 2008 at 19:41 #50871pixGuest
and what are the differences between each classes ?
i guess i could have a look to the 3gpp later…25th February 2008 at 20:13 #50872paraHOGuest
I have tried five time to put up the class A to F but it seem the website is allowing it to be posted.