System and method for clock distribution and synchronization and radio location
First Claim
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1. A method for synchronizing clocks in a wireless network, comprising:
- determining a distance of a first device from a clock source;
generating a time synchronization packet having a time stamp indicative of a time at the clock source and the distance to the first device;
distributing an adjusted time stamp to the first device based on the time stamp and the distance to the first device.
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Abstract
A system for locating a client in a wireless network. The system includes at least three access points. Each access point is adapted to wirelessly communicate with a client having a location using packeted data, be placed in wired data communication within a selected data network; and to share a common precise time reference using the selected data network. The system further includes a switch adapted to translate the relative position of the access points based on a shared common precise time reference and to calculate the location of the client based on a transmission from the client.
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Citations
20 Claims
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1. A method for synchronizing clocks in a wireless network, comprising:
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determining a distance of a first device from a clock source; generating a time synchronization packet having a time stamp indicative of a time at the clock source and the distance to the first device; distributing an adjusted time stamp to the first device based on the time stamp and the distance to the first device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus, comprising:
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a clock source; a first physical interface card communicatively coupled to the clock source and operable to determine a distance to a first device; wherein the first physical interface is further operable to receive a signal from the clock source indicative of a time at the clock source to generate a first timestamp based on the time at the clock source and the distance to the first device; and wherein the first physical interface is operable to distribute the first timestamp to the first device. - View Dependent Claims (13, 14, 15)
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16. A system, comprising:
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a network switch having a clock source; first, second and third access points at first, second and third locations respectively; wherein the switch is operable to determine a first distance to the first access point, a second distance to the second access point and a third distance to the third access point; wherein the switch is operable to distribute a first timing synchronization packet to the first wireless access point based on a current time at the clock source and the distance between the switch and the first access point; wherein the switch is operable to distribute a second timing synchronization packet to the second wireless access point based on a current time at the clock source and the distance between the switch and the second access point; and wherein the switch is operable to distribute a third timing synchronization packet to the third wireless access point based on a current time at the clock source and the distance between the switch and the third access point. - View Dependent Claims (17, 18, 19, 20)
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Specification