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Erlang Model

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  • #50773 Reply
    Cesar Trevino
    Guest

    Is there an erlang model I could use to estimate a service level goal, by only having numer of agents expected on a specific week, number of calls forecasted,expected AHT & expected Occupancy?

    #50774 Reply
    Huawei RF
    Guest

    If you have the number of subscribers, GoS, and Erlang for each subscriber, you can expect the required number of channels.

    For example:

    Number of subscribers= 20,000
    GoS usually = 0.02
    Erlang for each subscriber is usually given to be 25 mErl

    for the normal S4/4/4 configuration, each cell will have totally 4TRX * 8 Time slots= 32 channel (TDMA Concept)
    1 BCCH and 2 SDCCH for each cell so: 32-3= 29 channels
    from Erlang B table, maximum traffic afforded will be 21.04 Erl

    number of subscribers will be:
    max Erl/ Erl of each subscriber= 21.04/0.025= 841.6 = 841 subscriber for each cell

    Total number of sites required will be:
    20,000/(841*3)= 7.9= 8 sites approximately

    Note: No queue channel assumed

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