Geodesic
Network flow assignment as a~fixed point problem
Diskretnyj analiz i issledovanie operacij, Tome 23 (2016) no. 2, pp. 63-87

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This paper deals with the user equilibrium problem (flow assignment with equal journey time by alternative routes) and system optimum (flow assignment with minimal average journey time) in a network consisting of parallel routes with a single origin-destination pair. The travel time is simulated by arbitrary smooth nondecreasing functions. We prove that the equilibrium and optimal assignment problems for such a network can be reduced to the fixed point problem expressed explicitly. A simple iterative method of finding equilibrium and optimal flow assignment is developed. The method is proved to converge geometrically; under some fairly natural conditions the method is proved to converge quadratically. Bibliogr. 30.
Keywords: user-equilibrium, system optimum, fixed point, network routes. 
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     author = {A. Yu. Krylatov},
     title = {Network flow assignment as a~fixed point problem},
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A. Yu. Krylatov. Network flow assignment as a~fixed point problem. Diskretnyj analiz i issledovanie operacij, Tome 23 (2016) no. 2, pp. 63-87. http://geodesic.mathdoc.fr/item/DA_2016_23_2_a3/