Method for determining position of mobile communication terminals
First Claim
1. A method for determining the position of a mobile station in a cellular communications network, comprising the steps of:
- activating an uplink positioning channel in each of a plurality of cells in said cellular communications network;
transmitting a handover message to said mobile station responsive to a position request;
responsive to said handover message, said mobile station transmitting a handover access request on said uplink positioning channel;
responsive to a detection of said handover access request, a number of said plurality of cells determining a distance to said mobile station; and
determining said position of said mobile station from said number of distances.
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Accused Products
Abstract
A number of different solutions are described for gathering access delay and distance measurement information for use in determining the position of a cellular mobile station. For all of these solutions, one frequency and one uplink channel in each cell are dedicated for position determination. In one aspect of the present invention, a method is provided for determining the position of a mobile station using handover procedures for all of the cells or certain predefined cells in the network. One uplink channel is dedicated within each cell in the network to be used for position determination. These positioning channels continuously listen for handover access requests. Cells detecting the access bursts can measure the access delay and determine the distance to the requesting mobile station. A triangulation calculation is used to pinpoint the mobile station'"'"'s position. In another aspect of the present invention, a method is provided for determining the position of a mobile station using position determination procedures for all of the cells or certain predefined cells in the network.
96 Citations
16 Claims
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1. A method for determining the position of a mobile station in a cellular communications network, comprising the steps of:
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activating an uplink positioning channel in each of a plurality of cells in said cellular communications network; transmitting a handover message to said mobile station responsive to a position request; responsive to said handover message, said mobile station transmitting a handover access request on said uplink positioning channel; responsive to a detection of said handover access request, a number of said plurality of cells determining a distance to said mobile station; and determining said position of said mobile station from said number of distances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the position of a mobile station in a cellular communications network while maintaining a connection with said mobile station, comprising the steps of:
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activating an uplink positioning channel in each of a plurality of cells in said cellular communications network; transmitting a positioning message to said mobile station responsive to a position request; responsive to said positioning message, said mobile station transmitting a positioning access request on said uplink positioning channel, said positioning access request transmitted as an access burst; responsive to a detection of said positioning access request, a number of said plurality of cells determining a distance to said mobile station; and determining said position of said mobile station from said number of distances. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification