LOCATION AWARE INTELLIGENT TRANSPORTATION SYSTEMS
First Claim
1. A method of determining ranges between a plurality of communication devices, the plurality of communication devices including at least one mobile communication device, the method comprising:
- receiving, at the mobile communication device, receive messages transmitted from a plurality of other communication devices, each receive message including a transmit count stamp corresponding to a remote counter value at the transmission of the receive message from the corresponding other communication device, wherein the mobile communication device generates a receive count stamp for each receive message corresponding to a local counter value at the receipt of the receive message;
as the mobile communication device travels along a path relative to the plurality of other communication devices, dynamically associating and disassociating the mobile communication device with a plurality of sub-groups of the plurality of other communication devices, wherein the associating and disassociating are based at least in part on receiving receive messages from a predetermined number of other communication devices for each sub-group; and
for each sub-group currently associated with the mobile communication device, generating range estimates between the mobile communication device and the other communication devices in the particular sub-group, the range estimates based on a combination of the transmit count stamps and the receive count stamps.
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Accused Products
Abstract
A location aware intelligent transportation system determines ranges between a plurality of communication devices, including at least one mobile communication device. A method includes receiving receive messages transmitted from a plurality of other communication devices. Each receive message includes a transmit count stamp corresponding to a remote counter value. The mobile communication device generates a receive count stamp for each receive message. The method includes dynamically associating and disassociating the mobile communication device with a plurality of sub-groups of the plurality of other communication devices. The associating and disassociating are based at least in part on receiving receive messages from a predetermined number of other communication devices for each sub-group. For each sub-group currently associated with the mobile communication device, the method includes generating range estimates between the mobile communication device and the other communication devices in the particular sub-group. The range estimates are based on a combination of the transmit count stamps and the receive count stamps.
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Citations
5 Claims
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1. A method of determining ranges between a plurality of communication devices, the plurality of communication devices including at least one mobile communication device, the method comprising:
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receiving, at the mobile communication device, receive messages transmitted from a plurality of other communication devices, each receive message including a transmit count stamp corresponding to a remote counter value at the transmission of the receive message from the corresponding other communication device, wherein the mobile communication device generates a receive count stamp for each receive message corresponding to a local counter value at the receipt of the receive message; as the mobile communication device travels along a path relative to the plurality of other communication devices, dynamically associating and disassociating the mobile communication device with a plurality of sub-groups of the plurality of other communication devices, wherein the associating and disassociating are based at least in part on receiving receive messages from a predetermined number of other communication devices for each sub-group; and for each sub-group currently associated with the mobile communication device, generating range estimates between the mobile communication device and the other communication devices in the particular sub-group, the range estimates based on a combination of the transmit count stamps and the receive count stamps. - View Dependent Claims (2, 3, 4, 5)
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Specification