METHODS AND APPARATUS RELATING TO THE USE OF RECEIVED SIGNALS TO DETERMINE WIRELESS TERMINAL LOCATION AND/OR REFINE LOCATION DETERMINATION MODELS
First Claim
1. A method of determining the location of a wireless terminal, the method comprising:
- accessing a first access point antenna radiation model generated from measurements of a first antenna radiation pattern of a first access point antenna or generating the first access point antenna radiation model from a computer model of the first access point antenna;
performing a multipath correction to the first access point antenna radiation model to correct for multipath effects which are expected in an actual physical environment where the first access point antenna is to be deployed as part of a first access point, said multipath correction producing a first location adjusted access point antenna radiation model;
generating a first probability surface corresponding to the first access point for a first received signal strength, the first probability surface indicating location probabilities when a signal is received from the first access point at said first received signal strength; and
generating, based on at least said first probability surface a first wireless terminal location estimate for a wireless terminal reporting receipt of a signal from said first access point having said first received signal strength.
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Accused Products
Abstract
Methods and apparatus relating to use of actual and/or virtual beacons are described. Virtual beacons are virtual in that an actual beacon need not be transmitted but a rather a virtual beacon transmitter at a desired location maybe considered to transmit virtual beacons. In some embodiments a set of beacon transmitter information for one or more beacons is supplied to devices in a communications system. The beacon transmitter information indicates transmission power and location of actual and virtual beacon transmitters as well as information to be communicated by virtual beacons. Devices with access to beacon information can determine based on the location of a wireless terminal whether the wireless terminal is within coverage area of a virtual beacon and report reception of the virtual beacon to the wireless terminal or a component of the wireless terminal which acts upon receiving an indication of beacon reception.
57 Citations
20 Claims
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1. A method of determining the location of a wireless terminal, the method comprising:
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accessing a first access point antenna radiation model generated from measurements of a first antenna radiation pattern of a first access point antenna or generating the first access point antenna radiation model from a computer model of the first access point antenna; performing a multipath correction to the first access point antenna radiation model to correct for multipath effects which are expected in an actual physical environment where the first access point antenna is to be deployed as part of a first access point, said multipath correction producing a first location adjusted access point antenna radiation model; generating a first probability surface corresponding to the first access point for a first received signal strength, the first probability surface indicating location probabilities when a signal is received from the first access point at said first received signal strength; and generating, based on at least said first probability surface a first wireless terminal location estimate for a wireless terminal reporting receipt of a signal from said first access point having said first received signal strength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A location determination device, comprising:
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memory including a first access point antenna radiation model generated from measurements of a first antenna radiation pattern of a first access point antenna or an interface for receiving said first access point antenna radiation model; and a processor configured to; access said first access point antenna radiation model; perform a multipath correction to the first access point antenna radiation model to correct for multipath effects which are expected in an actual physical environment where the first access point antenna is to be deployed as part of a first access point, said multipath correction producing a first location adjusted access point antenna radiation model; generate a first probability surface corresponding to the first access point for a first received signal strength, the first probability surface indicating location probabilities when a signal is received from the first access point at said first received signal strength; and generate, based on at least said first probability surface a first wireless terminal location estimate for a wireless terminal reporting receipt of a signal from said first access point having said first received signal strength. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A non-transitory computer readable medium for use in a device, said non-transitory computer readable medium including processor executable instructions which when executed by at least one processor cause said device to:
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access a first access point antenna radiation model generated from measurements of a first antenna radiation pattern (e.g., in an anechoic chamber) of a first access point antenna or generating the first access point antenna radiation model from a computer model of the first access point antenna; perform a multipath correction to the first access point antenna radiation model to correct for multipath effects which are expected in an actual physical environment where the first access point antenna is to be deployed as part of a first access point, said multipath correction producing a first location adjusted access point antenna radiation model; generate a first probability surface corresponding to the first access point for a first received signal strength, the first probability surface indicating location probabilities when a signal is received from the first access point at said first received signal strength; and generate, based on at least said first probability surface a first wireless terminal location estimate for a wireless terminal reporting receipt of a signal from said first access point having said first received signal strength.
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Specification