Generic selectors
Exact matches only
Search in title
Search in content

Low Traf, Hidh TCH Congetion.Alcate

Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • #63825 Reply
    TA
    Guest

    Hello, all

    I have on the sector 1TRX with 1.1Erl BH and 6-10% TCH congetion.
    I have 1TS for BCCH, 1TS SDH, 5TS for TCH;
    EN_AMR_HR=ENABLE,
    MAX_PDCH=5, MAX_PDCH_HIGH_LOAD=1,MIN_PDCH=0

    how such it is possible?

    #63826 Reply
    pix
    Guest

    hello,

    so in the end the cell has 4 TCH TS, 1 PDCH TS, 1 BCCH TS and 1 SDCCH TS

    when applying the Erlang B formula
    4 channels @ 2% blocking = 1.05 erlang

    so the values you are sharing are not abnormal. It is rather high though, one should expect about 2% congestion, not 6-10%. Did you properly activate the TCH Queuing ? Is T11 around 6 seconds ?
    Also, try to decrease the max pdch to 4 instead of 5, and reduce the HIGH LOAD GPRS by 10%

    regards
    pix

    #63827 Reply
    TA
    Guest

    Hello, Pix
    Thanks for answer

    I have checked values:

    T11=15 seconds
    HIGH_TRAFFIC_LOAD_GPRS=85%

    First,I’ll try reduce high_traffic_load_gprs.
    But,I think reduce it to 10% is too much:)

    best regards

    #63828 Reply
    pix
    Guest

    hi,
    i didn’t say “to”, i said “by” ๐Ÿ˜‰

    #63829 Reply
    TA
    Guest

    ๐Ÿ˜‰ ok,Pix, i’ve understood you ๐Ÿ™‚

    I’ve reduced to 30%. Will see.

    What you think about T11=15 sec?

    #63830 Reply
    pix
    Guest

    it means the caller can wait 15 seconds in the queue. That seems humanly too long to wait, so caller might hang up by itself before the end of the queue. therefore your congestion will decrease… but it’s fake ๐Ÿ™‚

    (note: don’t put 15s on all your cells, because there is a limit on the total number of calls in queue at BSC level)

    altogether, i think you can play around with GPRS parameters (max pdch and the high load gprs), and then reduce the T11 down to a more normal value (6 to 10 s)
    Well, try and see…

    keep me posted,
    pix

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: Reply #63827 in Low Traf, Hidh TCH Congetion.Alcate
Your information:




<a href="" title="" rel="" target=""> <blockquote cite=""> <code> <pre class=""> <em> <strong> <del datetime="" cite=""> <ins datetime="" cite=""> <ul> <ol start=""> <li> <img src="" border="" alt="" height="" width="">