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calculate number sub from BHCA

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  • #40549 Reply
    peterholl2004
    Guest

    can you help me!
    I would like to calculate total number sub in local exchange from BHCA.
    thanks

    #40550 Reply
    mohsin ismail
    Guest

    hi peter

    this is my proposal of calculation:-

    BHCA= A*3600/B
    A=C/D
    D=C/D

    where
    A= traffic in erlang
    C= traffic in erlang per sub
    D= total number of sub.
    B= Mean holding time in secs.

    Here you must know:-
    B,C,BHCA, then you get the A. From A you will get D.

    good luck.

    rgds
    mohsin Ismail

    #40551 Reply
    Mohsin Ismail
    Guest

    corrections:-

    A=C*D

    #40552 Reply
    xxx
    Guest

    Hi Ismail

    Sorry, but too many mistake in your formular:

    D=C/D ?????????????????

    Pls check carefully before post it.

    #40553 Reply
    Vijay
    Guest

    Hi Moshin,

    I have a GSM Network with 300 K Subscribers.MHT is 100 Seconds.

    How can I calculate BHCA ?

    Rgds

    #40554 Reply
    Mohsin Ismail
    Guest

    hi xxx

    please see in my corrections..

    sorry for my mistake..

    #40555 Reply
    Mohsin Ismail
    Guest

    Hi Vijay

    you need Traffic in erlang/sub value. From that put in A=C*D, then compute in BHCA formula.

    good luck

    #40556 Reply
    xxx
    Guest

    Hi Ismail,

    Your correction still has the error. What is the formular D=C/D ?????????????????

    Pls correct it

    #40557 Reply
    Mohsin Ismail
    Guest

    XXX

    forget about D=C/D, the correct one is A=C*D.

    #40558 Reply
    Misa
    Guest

    Hi Vijay

    Here is the calculation:

    BHCA = BHT * 3600 / MHT

    where
    BHT = Busy Hour Traffic in Erlang
    MHT = Mean Holding Time in second

    BHT = NSUB * C

    where
    NSUB = number of subscribers
    C = traffic in Erlang per subscriber

    -> BHCA = NSUB * C * 3600 / MHT

    Normally C = 0.025 Erl/sub

    -> BHCA = 300000*0.025*3600/100
    -> BHCA = 270000

    Misa

    #40559 Reply
    Hi MISA
    Guest

    For this BHCA what are the routes we have to consider ?

    Let me Put my list of routes.

    ALL EXTERNAL PSTN
    ALL INTER MSC LINKS
    ALL BSC ROUTES
    VMS ROUTES
    SCP ANNOUNCEMENT ROUTE
    VAS SERVICE ROUTE

    Rgds

    Scot

    #40560 Reply
    Scot
    Guest

    Hi MISA,

    For Traffic Calculations and Engineering which routes we have to Montior ?

    BSC Incoming / Outgoing.

    PSTN Incoming /Outgoing.

    VMS Outgoing.

    What else ?

    Rgds

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