Locating a wireless user
First Claim
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1. A method for locating a subscriber unit, the method comprising:
- transmitting, from a plurality of antennas of a communication network, a plurality of spread spectrum signals having an associated code;
receiving, at the subscriber unit, the plurality of spread spectrum signals at and determining a plurality of chip timing differences from the plurality of spread spectrum signals, wherein each determined chip timing difference indicates a difference in received chip offset between a pair of antennas of the plurality of antennas;
determining a location of the subscriber unit using hyperbolas and the determined plurality of chip timing differences;
transmitting, from the subscriber unit, location information over a spread spectrum signal to the communication network which provides a location service; and
displaying information indicative of the determined location at the subscriber unit, wherein the displayed information includes a street address.
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Abstract
A plurality of antennas transmit a first spread spectrum signal having an associated code. The first spread spectrum signal is received at the wireless user. For each received first spread spectrum signal, a second spread spectrum signal is transmitted having an associated code having a same phase as that received first spread spectrum signal. The second spread spectrum signals are received at the plurality of antennas. A distance measurement is determined between each antenna and the wireless user based on in part a received timing of the second signals. The wireless user'"'"'s location is determined based on in part the distance determinations.
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Citations
14 Claims
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1. A method for locating a subscriber unit, the method comprising:
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transmitting, from a plurality of antennas of a communication network, a plurality of spread spectrum signals having an associated code; receiving, at the subscriber unit, the plurality of spread spectrum signals at and determining a plurality of chip timing differences from the plurality of spread spectrum signals, wherein each determined chip timing difference indicates a difference in received chip offset between a pair of antennas of the plurality of antennas; determining a location of the subscriber unit using hyperbolas and the determined plurality of chip timing differences; transmitting, from the subscriber unit, location information over a spread spectrum signal to the communication network which provides a location service; and displaying information indicative of the determined location at the subscriber unit, wherein the displayed information includes a street address. - View Dependent Claims (2, 3)
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4. A subscriber unit capable of being located, the subscriber unit comprising:
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a code division multiple access (CDMA) receiver configured to receive a plurality of spread spectrum signals transmitted from a plurality of antennas in a communication network; a control device and a CDMA transmitter configured to determine a plurality of chip timing differences from the plurality of spread spectrum signals, wherein each determined chip timing difference indicates a difference in received chip offset between a pair of antennas of the plurality of antennas; the control device further configured to determine a location of the subscriber unit using hyperbolas and the determined plurality of chip timing differences; a CDMA transmitter configured to transmit location information from the subscriber unit over a spread spectrum signal to the communication network which provides a location service; and a display configured to display a location of the subscriber unit, wherein the location includes a street address. - View Dependent Claims (5, 6)
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7. A method for use in a subscriber unit for enabling location of the subscriber unit, the method comprising:
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receiving a plurality of spread spectrum signals transmitted from a plurality of antennas of a communication network; determining a plurality of chip timing differences from the plurality of spread spectrum signals, wherein each determined chip timing difference indicates a difference in received chip offset between a pair of antennas of the plurality of antennas; determining a location of the subscriber unit using hyperbolas and the determined plurality of chip timing differences; transmitting location information from the subscriber unit over a spread spectrum signal to the communication network which provides a location service; and displaying information indicative of the determined location of the subscriber unit, wherein the displayed information includes a street address. - View Dependent Claims (8)
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9. A method for use in a communication network having a plurality of antennas, the method comprising:
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transmitting from the plurality of antennas a plurality of spread spectrum signals having an associated code; receiving location information from a subscriber unit over a spread spectrum signal, wherein the received location information is determined using a plurality of chip timing differences from the transmitted plurality of spread spectrum signals and hyperbolas, each determined chip timing difference indicating a difference in received chip offset between a pair of antennas of the plurality of antennas; and sending the received location information to a processing device to provide a location service, wherein the location service provides information including a street address. - View Dependent Claims (10, 11)
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12. A communication network comprising:
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a plurality of antennas configured to transmit a plurality of spread spectrum signals having an associated code; the plurality of antennas configured to receive location information from a subscriber unit over a spread spectrum signal, wherein the received location information is determined using a plurality of chip timing differences from the transmitted plurality of spread spectrum signals and hyperbolas, each determined chip timing difference indicating a difference in received chip offset between a pair of antennas of the plurality of antennas; and a processing device configured to provide a location service using the received location information, wherein the location service provides information including a street address. - View Dependent Claims (13, 14)
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Specification