Heavy Traffic Analysis of a Transportation Network Model
Heavy Traffic Analysis of a Transportation Network Model
William P Peterson
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Because the theory of what is now called multidimensional reflected Brownian motion was unknown at the time, Crane was able to explicitly describe his limit processes only for the case in which a single terminal in the network is critically loaded, in the sense that the exogenous passenger arrival rate at the terminal equals the rate at which vehicle capacity is provided there. Even in that case, the covariance manipulations presented are quite cumbersome. Our 1 Group 1 Group 1 ^N-l t t A \ N-1... A t Group 1 Group S2 ;si f 2 1 1 1 1 ' \ 1 1 ' If "N -N-1 >. 2 I amving passengers I disembarking passengers CI vehicle routes Figure 1: The transportation network. contribution here is to consider a sequence of systems in which all terminals approach critical loading. This state of affairs, which corresponds to the usual heavy traffic conditions con- sidered in the queueing literature, will be described precisely in Section . 3. In Section 4, we state and prove a hmit theorem for the vector process of queue lengths at the terminals, for which the limit process is a reflected Brownian motion (RBM) on the nonnegative orthant.
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