METHOD AND APPARATUS TO CONFIRM MOBILE EQUIPMENT HAS REMAINED RELATIVELY STATIONARY USING ONE OR MORE PILOT SIGNAL
First Claim
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1. A method of using received radio frequency signals to determine whether mobile equipment has remained relatively stationary;
- the method comprising;
storing a first strength of a radio frequency signal previously received by a tracking unit of the mobile equipment;
subsequently receiving at the mobile equipment the radio frequency signal;
calculating a second strength of the subsequently received radio frequency signal;
comparing the second strength to the first strength,determining that the mobile equipment is substantially at a previously determined location if the second strength is with a predetermined tolerance of the first strength, wherebyit can be determined that the mobile equipment has been relatively stationary without performing a location determination.
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Abstract
A tracking unit operably coupled to mobile equipment is provided. The tracking unit is capable of using a pilot channel for CDMA networks, a broadcast channel for GSM networks or the like, to determine that the tracking unit has remained relatively stationary. The tracking unit determines it has remained relatively stationary by determining that it is receiving the same radio frequency signals at approximately the same strength as it previously received.
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Citations
30 Claims
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1. A method of using received radio frequency signals to determine whether mobile equipment has remained relatively stationary;
- the method comprising;
storing a first strength of a radio frequency signal previously received by a tracking unit of the mobile equipment; subsequently receiving at the mobile equipment the radio frequency signal; calculating a second strength of the subsequently received radio frequency signal; comparing the second strength to the first strength, determining that the mobile equipment is substantially at a previously determined location if the second strength is with a predetermined tolerance of the first strength, whereby it can be determined that the mobile equipment has been relatively stationary without performing a location determination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- the method comprising;
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13. A method of using received radio frequency signals to determine whether mobile equipment has remained relatively stationary;
- the method comprising;
receiving at the mobile equipment at least one repetitive radio frequency signal; establishing a database comprising information of previously received repetitive radio frequency signals received at the mobile equipment, the information comprising an identifier for each previously received repetitive radio frequency signal and a strength for each previously received repetitive radio frequency signal; comparing information of a currently received repetitive radio frequency signal to information in the database of previously received repetitive radio frequency signals to determine whether the mobile equipment is approximately in the same location; and updating the information in the database with the information from the currently received repetitive radio frequency signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 24, 25, 26, 27, 28)
- the method comprising;
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21. A tracking unit operably coupled to mobile equipment to determine whether the mobile equipment has been relatively stationary comprising:
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a wireless receiver operable to receive current radio frequency transmissions; a controller operably coupled to the wireless receiver to extract information from the current radio frequency transmissions, the information comprising an identifier for each of the radio frequency transmissions and a strength for each of the radio frequency transmissions; and a memory to store the information of previously received radio frequency transmissions, wherein the controller is operable to compare the information of the current radio frequency transmissions to the previously received radio frequency transmissions to determine that the mobile equipment has remained relatively stationary. - View Dependent Claims (22, 23)
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29. The tracking unit of claim 20 comprising a GPS receiver adapted to determine the position of the mobile equipment whereby the controller is operable to store the position of the mobile equipment in the memory and adapted to use the position of the mobile equipment to tune the ability to determine whether the mobile equipment has remained relatively stationary.
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29-1. A computer program product containing computer executable code stored on a computer readable storage medium that cause a computer to:
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receive current radio frequency transmissions; extract information from the current radio frequency transmissions, the information comprising an identifier for each of the radio frequency transmissions and a strength for each of the radio frequency transmissions; and store the information of previously received radio frequency transmissions; and compare the information of the current radio frequency transmissions to the previously received radio frequency transmissions to determine that the mobile equipment has remained relatively stationary.
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30. A tracking unit to receive radio frequency signals to determine whether mobile equipment has remained relatively stationary;
- the tracking unit comprising;
means for storing a first strength of a radio frequency signal previously received by a tracking unit of the mobile equipment; means for receiving at the mobile equipment the radio frequency signal; means for calculating a second strength of the received radio frequency signal received subsequent to storing the first strength; means for comparing the second strength to the first strength, means for determining that the mobile equipment is substantially at a previously determined location if the second strength is with a predetermined range of the first strength, whereby it can be determined that the mobile equipment has been relatively stationary without performing a location determination.
- the tracking unit comprising;
Specification