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Erlang Formula

Viewing 15 posts - 61 through 75 (of 181 total)
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  • #32922 Reply
    Jidine
    Guest

    Hi everybody,

    I just want to ask a question and it might be confused. I hope you all did see Oliveira, Suda and Kim paper in IEEE, title ‘Adaptive bandwidth reservation scheme for high speed multimedia wireless networks’. If you all know what it is means by the bandwidth requirement and connection duration follows a geometric distribution. What is the solution for that. I hope you can give me an idea.

    Thank you

    #32923 Reply
    stanley matinenga
    Guest

    where can i get a free tutorail on traffic system design

    #32924 Reply
    John Patrick
    Guest

    Does any know how to speed up the calculation of erlang B. It appears the high the traffic value the slower the routine runs. I am using C/C++. Any help would be appreciated.

    #32925 Reply
    Anboo
    Guest

    I feel that the below mentioned example is wrong.. This was given in one of the famous website.

    The point is, user makes 30 calls in an hr.. so mean holding time is 2 mins on avg. then how can each call can be held on an avg of 5 min in the below example ? Am I wrong plz clarify ???

    For example, if a group of user made 30 calls in one hour, and each call had an average call duration of 5 minutes, then the number of Erlangs this represents is worked out as follows:

    Minutes of traffic in the hour = number of calls x duration
    Minutes of traffic in the hour = 30 x 5
    Minutes of traffic in the hour = 150
    Hours of traffic in the hour = 150 / 60
    Hours of traffic in the hour = 2.5
    Traffic figure = 2.5 Erlangs

    #32926 Reply
    anboo
    Guest

    Stupid me… I am wrong. Well the resource on the above example has to be considered. Say we have more than one timeslot and the calculation window is for an hr. the above example makes sense.

    Any input..

    #32927 Reply
    Anboo
    Guest

    Hi David Shapiro !!!

    Well, to answer your question.. you are right its the probability of your calls lands busy !! its blocking probability. Well circuits are different from lines. Here trunk line is 31 timeslots. And the next point is on the sample period say an hour, yes it is ur busy hr traffic. I hope now u get the answer .

    #32928 Reply
    AASHISH AHUJA
    Guest

    HI M WORKING ON A PROJECT FOR BHARTI.COULD ANYBODY HELP ME WITH ERLANG A.THE ASSUMPTIONS WHICH ERLANG USES LEADS TO ERRORS.HOWEVER WHENEVER WE ACCOUNT FOR REQUEING IN THE FORM OF CALLING AGAIN AND ABANDONMENT RESULTS SHALL DIFFER.
    HOW TO MAKE IT MORE TOWARDS PRECISION.

    #32929 Reply
    Dennis
    Guest

    My Co. using AXE switch. I’ve a question about the “Traffic Measurement of Routes results, LSR” on AXE. Even, I read the ALEX, I still don’t understand the calculation about “TRAFF”. I do hope someone can help me. Thanks in advance.

    **********************************************************************
    TRAFFIC MEASUREMENT ON ROUTES RESULTS, LSR
    TRG MP NRP RPL RPN GRN DATE TIME SI NM FCODE
    7 39 96 15 1 1 030704 0000 30 NO

    R TRAFF NBIDS CCONG NDV ANBLO MHTIME NBANSW
    CITIC2O 3.8 15 0.0 95 0.0 224.4 11
    IBASISO 0.0 2 0.0 30 0.0 0.0 0
    HCA01O 35.4 772 23.3 47 0.0 53.3 146
    CM01O 0.3 20 0.0 23 1.0 11.6 2
    WCOM02O 10.7 40 0.0 29 0.0 238.4 19
    ADVTELO 0.0 0 0.0 30 0.0 0.0 0
    END

    #32930 Reply
    David Shapiro
    Guest

    Thanks Anboo for the information.

    John Patrick, not sure what your code looks like. You could just compute all values likely to get used and save them to a database or flat file. Then, all your program would need to do is a query if you use a database. You could use hashing otherwise.

    #32931 Reply
    Lee Ann
    Guest

    TRAFF can be defined in the MSC’s as several different measurements based upon the set-up configuration. However, in your case, it appears TRAFF is the erlang counter. Erlang * 60 = Minutes of use. There is plenty of info on the erlang probability in this forum. Feel free to email me if you need more clarification. lejones@tritonpcs.com
    Lee Ann Jones
    Wireless Network Traffic Engineer

    #32932 Reply
    Vinod
    Guest

    Hello

    Any idea what is meant by derl?

    #32933 Reply
    Yumi
    Guest

    Hi….. How can I use the erlang table?

    I got to the Erlang number 55 and I want to know how many channels do I need at my central site… I used one calculator available at the internet, but I’d like to understand how it works… I search about it, but I didn’t find what I need..

    Could someone give me a brief explanation about it or inform me a site which has it?

    #32934 Reply
    Lee Ann
    Guest

    You have to pick a Grade of Service or acceptable level of congstion to derive channels needed (usually 1 to 5% and also known as probibility). I use P.01 (1% GOS) for trunks and P.02 (2% GOS) for wireless voice paths, plus decide on a utilization % to be ahead of the curve (80 to 95% utilization means I take the erlang divide by .8 or .95).

    55 erlang,
    at 100% utilization (what you requested) for 2% GOS = 66 voice paths; for 3% GOS = 63; for 4% = 61; for 5% = 60.

    Erlang B defined: A probability distribuiton developed by A.K. Erlang to estimate the # of telephone trunks needed to carry a given amount of traffic. Erlang B assumes that, when a call arriving at random finds all trunks busy, it vanishes. Erlang B is used when the traffic is random and there is no queuing.

    Lee Ann Jones
    Network Traffic Planning Engineer

    #32935 Reply
    Eugene
    Guest

    Hi i’m searching for the source code to programme the erlang B formula using MATLAB. Does anyone have or guide me to some website for me to try out.

    Thanks you

    #32936 Reply
    Francisco Armando
    Guest

    Dear Sir/Madam,

    I work at a telco company.

    I would like to know whta’s the formula used to convert erlang into miniutes.

    Thanks in advanced

    Regards

Viewing 15 posts - 61 through 75 (of 181 total)
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