Kendall’s Notation ❚ Simple way of summarizing the characteristics of a queue. Arrival characteristics / Departure characteristics / Number of servers.

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Presentation transcript:

Kendall’s Notation ❚ Simple way of summarizing the characteristics of a queue. Arrival characteristics / Departure characteristics / Number of servers / Max number of customers. (M/M/1/100) The arrival and departure characteristics are summarized by ❚ M — Markov — Poisson distributed arrivals, exponentially distributed service times. ❚ D — Deterministically distributed times. ❚ G — General distribution for inter-arrival/service times.

Faster Arrivals than Service Notice that if the arrival rate (birth rate) is greater than the service rate (death rate) then ρ>1 and the series in doesn’t converge. This is indicative of the fact that if the birth rate is greater than the death rate there is no steady state distribution. The queue continues to grow in size.

M/M/1 : Average number in queue

Hints for the Simulation At each time step there are three possible events: ➥ the state of the system increases by one; ➥ the state of the system decreases by one and ➥ the state of the system stays the same.

Approximating a Continuous M/M/1 Queue ❚ We know that a Poisson process can be derived by considering the limit of a simple Markov chain. ❚ A continuous M/M/1 queue is the limit of the discrete model we are using for simulation. ❚ In lab class you can make this approximation by taking Δt to be much smaller than λ or μ. ❚ Then you may set P(b) = λΔt and P(d) = μΔt.