Adapter that converts precision time protocol (PTP) to global positioning system (GPS)
First Claim
Patent Images
1. A method for relaying a global positioning system (GPS) signal using an Ethernet cable, comprising:
- receiving a power over Ethernet (PoE) flow and a precision time protocol (PTP) at an adapter;
converting at least one of the PoE flow or the PTP to the GPS signal in the adapter; and
sending the GPS signal to a type of base station, wherein the GPS signal includes a L1 band frequency but does not include location data and subframes 1, 2, or 3.
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Abstract
A method and apparatus are provided for converting a precision time protocol (PTP) to a GPS signal. Enterprise versions of Femtocells are located within buildings and do not have access to a GPS signal directly from a GPS satellite. An adapter is provided that takes an available PTP and power over Ethernet (PoE) flow and converts the signal into a pseudo-GPS signal that acts as a timing input into the Femtocell. The pseudo-GPS signal is a GPS signal modulated at the L1 band frequency or 1575.42 megahertz, but does not have location data nor subframes 1, 2, or 3, as found in an ordinary GPS signal.
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Citations
13 Claims
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1. A method for relaying a global positioning system (GPS) signal using an Ethernet cable, comprising:
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receiving a power over Ethernet (PoE) flow and a precision time protocol (PTP) at an adapter; converting at least one of the PoE flow or the PTP to the GPS signal in the adapter; and sending the GPS signal to a type of base station, wherein the GPS signal includes a L1 band frequency but does not include location data and subframes 1, 2, or 3. - View Dependent Claims (2)
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3. An apparatus for creating a global positioning system (GPS) signal using an Ethernet cable, comprising:
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a power over Ethernet (PoE) splitter that receives a PoE flow and a precision time protocol (PTP); the PoE splitter that provides power to an oscillator and a conversion engine, and that provides the PTP to the conversion engine; the oscillator that provides a frequency to the conversion engine; and the conversion engine that provides the GPS signal, wherein the GPS signal is a pseudo-GPS signal, which is the GPS signal with a L1 band frequency but without location data and subframes 1, 2, or 3. - View Dependent Claims (4, 5, 6, 7)
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8. A conversion engine for converting an Ethernet signal to a GPS signal, comprising:
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a precision time protocol (PTP) stack that receives a PTP over Ethernet; the PTP stack that sends a one pulse per second signal and a 10.23 megahertz signal to a controller, and that provides an Ethernet output; a phase lock loop that provides a corrective phase alignment from the controller to an oscillator; the controller that receives a power signal, receives a frequency from the oscillator, and receives the one pulse per second signal and the 10.23 megahertz signal from the PTP stack; and the controller that provides the GPS signal, wherein the GPS signal is a pseudo-GPS signal, which is the GPS signal with a L1 band frequency but without location data and subframes 1, 2, or 3. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification