METHOD AND SYSTEM FOR TIME-DEPENDENT ROUTING
First Claim
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1. A method of determining a time-dependent route parameter for a transportation network, for use in an automated routing system in connection with traffic, transportation, and logistics, said method comprising the steps:
- a) modelling the transportation network in the form of a graph (G) in the memory (2) of a computer system (1), said graph comprising a plurality of nodes (s, t, u, v, w), wherein said nodes correspond to starting-locations, target locations, and intermediate way-points in said transportation network, and a plurality of edges (E) interconnecting pairs of said nodes, wherein said edges indicate travel costs for travelling between respective nodes, wherein at least some of said travel costs are time-dependent quantities;
b) for at least one arbitrary starting-node (s) of said plurality of nodes and for a first set of departure times (τ
), computing and storing first travel costs for respective first routes on said graph, said first routes leading from said one starting-node to a first plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes;
c) for at least one arbitrary target node (t) of said plurality of nodes and for a second set of departure times, computing and storing second travel costs for respective second routes on said graph, said second routes leading from a second plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes to said one target node;
d) for a plurality of target nodes and/or starting-nodes, determining a time-dependent travel cost for at least one route on said graph between said starting-node and said target node via at least one intermediate way-point node, which at least one intermediate way-point node is comprised in both of said first and second plurality of intermediate way-point nodes, from said first travel costs and said second travel costs, ande) for a third set of departure times (τ
), determining said time-dependent route parameter based on said time-dependent travel cost.
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Abstract
A method of determining a time-dependent route parameter for a transportation network, for use in an automated routing system in connection with traffic, transportation, and logistics is provided. While shortest distances from all source nodes in S to all target nodes in T are time-independent, travel times are not. The method models the transportation network and computes travel costs from an arbitrary starting node to a plurality of intermediate way-points, and from intermediate way points to the target node.
60 Citations
19 Claims
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1. A method of determining a time-dependent route parameter for a transportation network, for use in an automated routing system in connection with traffic, transportation, and logistics, said method comprising the steps:
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a) modelling the transportation network in the form of a graph (G) in the memory (2) of a computer system (1), said graph comprising a plurality of nodes (s, t, u, v, w), wherein said nodes correspond to starting-locations, target locations, and intermediate way-points in said transportation network, and a plurality of edges (E) interconnecting pairs of said nodes, wherein said edges indicate travel costs for travelling between respective nodes, wherein at least some of said travel costs are time-dependent quantities; b) for at least one arbitrary starting-node (s) of said plurality of nodes and for a first set of departure times (τ
), computing and storing first travel costs for respective first routes on said graph, said first routes leading from said one starting-node to a first plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes;c) for at least one arbitrary target node (t) of said plurality of nodes and for a second set of departure times, computing and storing second travel costs for respective second routes on said graph, said second routes leading from a second plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes to said one target node; d) for a plurality of target nodes and/or starting-nodes, determining a time-dependent travel cost for at least one route on said graph between said starting-node and said target node via at least one intermediate way-point node, which at least one intermediate way-point node is comprised in both of said first and second plurality of intermediate way-point nodes, from said first travel costs and said second travel costs, and e) for a third set of departure times (τ
), determining said time-dependent route parameter based on said time-dependent travel cost. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A computer-readable storage medium adapted for use in a computer system (1) with a program code for execution by the computer system (1), wherein said computer system with the program code is adapted to
a) model a transportation network in the form of a graph (G) in a memory (2) of the computer system (1), said graph comprising a plurality of nodes (s, t, u, v, w), wherein said nodes correspond to starting-locations, target locations, and intermediate way-points in said transportation network, and a plurality of edges (E) interconnecting pairs of said nodes, wherein said edges indicate travel costs for travelling between respective nodes, wherein at least some of said travel costs are time-dependent quantities; -
b) for at least one arbitrary starting-node (s) of said plurality of nodes and for a first set of departure times (τ
), computing and storing first travel costs for respective first routes on said graph, said first routes leading from said one starting-node to a first plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes;c) for at least one arbitrary target node (t) of said plurality of nodes and for a second set of departure times, computing and storing second travel costs for respective second routes on said graph, said second routes leading from a second plurality of intermediate way-point nodes (u, v, w) of said plurality of nodes to said one target node; d) for a plurality of target nodes and/or starting-nodes, determining a time-dependent travel cost for at least one route on said graph between said starting-node and said target node via at least one intermediate way-point node, which at least one intermediate way-point node is comprised in both of said first and second plurality of intermediate way-point nodes, from said first travel costs and said second travel costs, and e) for a third set of departure times (τ
), determining said time-dependent route parameter based on said time-dependent travel cost. - View Dependent Claims (16, 17, 18, 19)
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Specification