WIRELESS COMMUNICATION SYSTEM AND METHOD FOR TRAINS AND OTHER VEHICLES USING TRACKSIDE BASE STATIONS
First Claim
1. A method for wireless communication between a mobile router in a moving vehicle and an external wireless network comprising a plurality of base stations distributed along a vehicle path of travel in compliance with a Wireless Local Area Network (WLAN) standard, the method comprising:
- a) setting a current value for a timeout parameter within the WLAN standard to a default maximum value exceeding a maximum propagation time between neighboring base stations along said vehicle path;
b) determining when at least one mobile router is within the range of a first base station;
c) determining a roundtrip time for communication between the first base station and the mobile router of said at least one mobile router being most distant from said first base station;
d) setting, in case said roundtrip time is significantly lower than said current value, a new current value in dependence on said roundtrip time; and
e) repeating at least steps b-d.
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Accused Products
Abstract
A method and device for wireless communication between a mobile router in a moving vehicle, such as a train, and an external wireless network is disclosed. The external network includes a plurality of base stations distributed along a vehicle path of travel in compliance with a WLAN standard. The method includes: setting a current value for a timeout parameter within the WLAN standard to a default maximum value exceeding a maximum propagation time between neighboring base stations along the vehicle path; determining when at least one mobile router is within the range of a first base station; determining a roundtrip time for communication between the first base station and the mobile router of the mobile router being most distant from the first base station; setting, in case this roundtrip time is significantly lower than the current value, a new current value in dependence on the roundtrip time.
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Citations
15 Claims
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1. A method for wireless communication between a mobile router in a moving vehicle and an external wireless network comprising a plurality of base stations distributed along a vehicle path of travel in compliance with a Wireless Local Area Network (WLAN) standard, the method comprising:
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a) setting a current value for a timeout parameter within the WLAN standard to a default maximum value exceeding a maximum propagation time between neighboring base stations along said vehicle path; b) determining when at least one mobile router is within the range of a first base station; c) determining a roundtrip time for communication between the first base station and the mobile router of said at least one mobile router being most distant from said first base station; d) setting, in case said roundtrip time is significantly lower than said current value, a new current value in dependence on said roundtrip time; and e) repeating at least steps b-d. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless device for wireless communication between a mobile router in a moving vehicle and an external wireless network comprising a plurality of base stations distributed along a vehicle path of travel, in compliance with a Wireless Local Area Network (WLAN) standard, the device including a processor arranged to perform the steps:
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a) setting a current value for a timeout parameter within the WLAN standard to a default maximum value exceeding a maximum propagation time between neighboring base stations along said vehicle path; b) determining when at least one mobile router is within the range of a first base station; c) determining a roundtrip time for communication between the first base station and the mobile router of said at least one mobile router being most distant from said first base station; d) setting, in case said roundtrip time is significantly lower than said current value, a new current value in dependence on said roundtrip time; and e) repeating at least steps b-d.
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Specification