Method to control the update frequency of a positioning device by a mobile terminal
2 Assignments
0 Petitions
Accused Products
Abstract
A mobile radiocommunications terminal contains or is operatively connected to a position estimator, such as a GPS receiver. The mobile terminal stores at least one reference position. The mobile terminal updates its position at a frequency that is a function of its distance from the reference position, or as a function of the rate of change of its distance from the reference position.
31 Citations
37 Claims
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1-12. -12. (canceled)
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13. A method of initiating a search for a control channel in a communications network by a mobile terminal, said method comprising:
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storing at least one reference position indicative of a central point of said communications network in said mobile terminal;
determining the current position of said mobile terminal;
computing the distance of said current position of said mobile terminal from said reference position; and
initiating a search for a channel based on said distance between said mobile terminal and said communication network. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. (canceled)
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23. A mobile terminal comprising:
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a transceiver transmitting and receiving signals over a wireless channel;
memory storing at least one reference position indicative of a central point of a communications network;
a position estimator to determine a current position of said mobile terminal; and
control logic including a processor to calculate the distance of said mobile terminal from said reference position based on said current position of said mobile terminal and to initiate a search for a channel based on said calculated distance. - View Dependent Claims (24, 25, 26, 28)
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27. (canceled)
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29-33. -33. (canceled)
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34. A method of controlling the initiation of a search by a mobile terminal for a channel associated with a radiocommunication system comprising:
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repeatedly determining the location of the mobile terminal with respect to a central point associated with the radio communication system; and
initiating a search for a channel associated with said radio communication system if the computed distance between the mobile terminal and the central point is less than a predetermined distance.
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35. (canceled)
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36. A method of initiating a search for a control channel in a communications network by a mobile terminal, said method comprising:
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storing a plurality of reference positions defining the boundary of said communications network in said mobile terminal;
determining the current position of said mobile terminal;
comparing said current position of said mobile terminal to said boundary; and
initiating a search for a channel if said mobile terminal position is within said boundary.
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37. A mobile terminal comprising:
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a transceiver transmitting and receiving signals over a wireless channel;
memory storing a plurality of reference positions defining the boundary of a communications network;
a position estimator to determine a current position of said mobile terminal; and
control logic including a processor to compare the current position of said mobile terminal to said reference positions and to initiate a search for a channel if said current position is within said boundary.
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Specification