Navigation system
First Claim
1. A traffic information distribution server, wherein the server comprises:
- a traffic information obtaining unit for obtaining traffic information relating to a link configuring a route or a link belonging to an area including the link configuring the route, and to a predicted running duration of the link; and
a sending unit for downloading the obtained traffic information to a terminal unit.
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Accused Products
Abstract
The present invention aims to provide a technique that can download traffic information in a more efficient manner, in a navigation system including a traffic information distribution server and a terminal unit. The information distribution server narrows down whereas possible traffic information to that to be used for the processing at the terminal unit before downloading the information to the unit. For example, the traffic information distribution server includes: a traffic information obtaining unit for obtaining traffic information pertaining to a link configuring a route or the periphery of the link (e.g., mesh area including the link), and to a predicted running duration of the link; and a sending unit for downloading the obtained traffic information to the terminal unit. Means for narrowing down the object for download may be possessed by the server or the terminal unit.
42 Citations
12 Claims
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1. A traffic information distribution server, wherein the server comprises:
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a traffic information obtaining unit for obtaining traffic information relating to a link configuring a route or a link belonging to an area including the link configuring the route, and to a predicted running duration of the link; and
a sending unit for downloading the obtained traffic information to a terminal unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12)
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8. A terminal unit comprising:
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a route search unit for searching a route from a starting location to a destination by using a link cost stored in a memory unit possessed by the route search unit; and
a download request unit for requesting a traffic information distribution server for distributing traffic information to download traffic information relating to a link belonging to the searched route or to an area including the searched route, wherein the route search unit reperforms route search by using, for a link whose link cost is included in traffic information downloaded from the traffic information distribution server, the link cost, and for other links, a link cost stored in the memory unit possessed by the route search unit. - View Dependent Claims (9, 10)
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Specification