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RF Contest!

Viewing 15 posts - 31 through 45 (of 72 total)
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  • 18th February 2008 at 18:51 #50858
    Pix
    Guest

    ParaHO, great 🙂 i’m glad i could help. FYI, I don’t know in which 3GPP ref you could find this information…

    Regards,
    Pix

    21st February 2008 at 11:22 #50859
    RaDiAtEd
    Guest

    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 #50860
    Pix
    Guest

    Hello Radiated,

    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 ?

    Best regards,

    Pix

    22nd February 2008 at 16:46 #50861
    Pix
    Guest

    wow… i got you real quiet now !

    23rd February 2008 at 07:08 #50862
    Bilal
    Guest

    Next question 🙂

    23rd February 2008 at 08:18 #50863
    Pix
    Guest

    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 #50864
    Arsal
    Guest

    Its 120 ms & 235 ms for TCH & SDCCH repectively.

    Regards

    Arsal

    23rd February 2008 at 14:45 #50865
    Bilal
    Guest

    I think for SDCCH it is 471ms.

    23rd February 2008 at 15:05 #50866
    paraHO
    Guest

    The SACCH periodicity SDCCH 470.2ms

    The SACCH periodicity TCH 480ms

    23rd February 2008 at 16:12 #50867
    pix
    Guest

    and the winner is …

    paraHO !!!!

    :))

    finally, we have a winner !

    do you have a question for us ?

    23rd February 2008 at 18:19 #50868
    paraHO
    Guest

    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 #50869
    Bilal
    Guest

    I am aware of SAPI 3 only

    25th February 2008 at 17:17 #50870
    paraHO
    Guest

    Agree Bilal, SAPI3 is assigned specifically for SMS text.

    LAPDm: the classes associated with handling SMS there are:

    Annex F
    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 #50871
    pix
    Guest

    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 #50872
    paraHO
    Guest

    I have tried five time to put up the class A to F but it seem the website is allowing it to be posted.

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