Method, system and arrangements for setting up and maintaining a WLAN connection within predictably moving vehicles
First Claim
1. A wireless device comprising:
- a mobile router configured to be located within a vehicle that has a predictable path of movement and configured to act as a hub of a wireless network on board the vehicle,wherein the mobile router is configured to communicate with a fixed transceiver in a cell of which the mobile router resides during a predictable path of movement of the vehicle, and wherein the mobile router is equipped with routing capability,wherein said mobile router is configured to implement routing of data packets between a packet-switched data network and at least one end user terminal operating in the wireless network on board the vehicle, andwherein said mobile router is configured to perform a corrective measure in a radio connection between a transceiver of said mobile router and said fixed transceiver using a magnitude of a doppler shift of the radio connection and a determined speed at which the mobile router on board the vehicle is moving received from a speed determination unit, which corrective measure comprises dynamically selecting packet size based at least in part on the magnitude of the doppler shift, wherein a smaller packet size is selected when the magnitude of the doppler shift becomes larger and a larger packet size is selected when the magnitude of the doppler shift becomes smaller.
1 Assignment
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Accused Products
Abstract
Setting up and maintaining wireless communication connections with end user'"'"'s terminals (301) on board a predictably moving vehicle (303) is shown with mechanisms for correcting for Doppler effects. A central device (302) within the vehicle (303) acts as a hub of a wireless network. There are a number of fixed transceivers (304). A connection arrangement (305, 306, 705, 706, 1001, 1101, 1122) connects the fixed transceivers (304) to an external packet-switched data network. The central device (302) within the vehicle (303) is a mobile router (302) equipped with routing capability (407). The connection arrangement (305, 306, 705, 706, 1001, 1101, 1122) includes a connection (705, 706, 1001) between a number of fixed transceivers (304) and a fixed central device (305) The fixed central device (305) has routing capability (1007), and together with the mobile router (302) implement routing of packets between the packet-switched network and an end user'"'"'s terminal (301).
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Citations
10 Claims
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1. A wireless device comprising:
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a mobile router configured to be located within a vehicle that has a predictable path of movement and configured to act as a hub of a wireless network on board the vehicle, wherein the mobile router is configured to communicate with a fixed transceiver in a cell of which the mobile router resides during a predictable path of movement of the vehicle, and wherein the mobile router is equipped with routing capability, wherein said mobile router is configured to implement routing of data packets between a packet-switched data network and at least one end user terminal operating in the wireless network on board the vehicle, and wherein said mobile router is configured to perform a corrective measure in a radio connection between a transceiver of said mobile router and said fixed transceiver using a magnitude of a doppler shift of the radio connection and a determined speed at which the mobile router on board the vehicle is moving received from a speed determination unit, which corrective measure comprises dynamically selecting packet size based at least in part on the magnitude of the doppler shift, wherein a smaller packet size is selected when the magnitude of the doppler shift becomes larger and a larger packet size is selected when the magnitude of the doppler shift becomes smaller. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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establishing a wireless network around a mobile router on board a vehicle that has a predictable path of movement, setting up a radio connection between a transceiver of the mobile router and one of a number of fixed transceivers, each of which has a geographical coverage area that constitutes a cell, utilizing said radio connection to transfer data packets between the mobile router on board the vehicle and an external packet-switched data network, maintaining routing tables at said mobile router on board the vehicle, in order to route data packets between the packet-switched data network and an end user'"'"'s terminal operative in the wireless network on board the vehicle, determining a speed at which the mobile router on board the vehicle is moving relative to a fixed transceiver, and performing a corrective measure in said radio connection on a basis of a magnitude of a doppler shift of the radio connection and the determined speed, which corrective measure comprises dynamically selecting packet size based at least in part on the magnitude of the doppler shift, wherein a smaller packet size is selected when the magnitude of the doppler shift becomes larger and a larger packet size is selected when the magnitude of the doppler shift becomes smaller. - View Dependent Claims (6, 7, 8)
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9. Apparatus comprising:
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a control processor configured to cause said apparatus at least to; establish a wireless network around a mobile router on board a vehicle that has a predictable path of movement; set up a radio connection between a transceiver of the mobile router and one of a number of fixed transceivers, each of which has a geographical coverage area that constitutes a cell; utilize said radio connection to transfer data packets between the mobile router on board the vehicle and an external packet-switched data network; maintain routing tables at said mobile router on board the vehicle, in order to route data packets between the packet-switched data network and an end user'"'"'s terminal operative in the wireless network on board the vehicle; determine a speed at which the mobile router on board the vehicle is moving relative to a fixed transceiver; and perform a corrective measure in said radio connection on a basis of a magnitude of a doppler shift of the radio connection and the determined speed, which corrective measure comprises dynamically selecting packet size based at least in part on the magnitude of the doppler shift, wherein a smaller packet size is selected when the magnitude of the doppler shift becomes larger and a larger packet size is selected when the magnitude of the doppler shift becomes smaller. - View Dependent Claims (10)
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Specification