12.07.2015 Views

Tema 2 – Teletráfico Dimensionado de Sistemas

Tema 2 – Teletráfico Dimensionado de Sistemas

Tema 2 – Teletráfico Dimensionado de Sistemas

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Re<strong>de</strong>s Telefónicas <strong>–</strong> <strong>Tema</strong> 2: <strong>Teletráfico</strong>. <strong>Dimensionado</strong> <strong>de</strong> sistemasCola M/M/1 A partir <strong>de</strong> dicho resultado se pue<strong>de</strong> caracterizar el sistema…−−−Número medio <strong>de</strong> clientes en el sistema∞∞∞= ⎛ ⎞= ρ ( − ρ ) = ρ( − ρ) ρ = ρ( − ρ ) ⎜ ∑∞kk-1 d kN ∑kPk∑k1 1 ∑k1ρ ⎟ =k=0 k=0k=0dρ⎝ k=0 ⎠d ⎛ 1 ⎞ ρ= ρ( 1−ρ ) ⎜ ⎟ =dρ⎝1−ρ ⎠ 1−ρNúmero medio <strong>de</strong> clientes en la colaNw∞∞kt+1( k -1P ) = ( k -1) ρ ( 1−ρ ) = tρ( 1−ρ )= ∑ ∑ ∑kk= 1k=1t=012ρ− ρTiempo medio en el sistema y en la cola, aplicando la relación <strong>de</strong> Little∞=W SWWN= =λρ 1 1=1−ρ λ µ − λ2NWρ 1 ρ= = =λ 1−ρ λ µ − λ1 ρWS − WW= − =µ − λ µ − λ1µRamón Agüero Calvo37

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