US5670964A — Navigation assistance for call handling in mobile…

Claim 1

Independent Claim 127 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a signal from at least one of said fixed stations; decoding said signal to obtain broadcast information; measuring the signal strength of said signal received from said at least one fixed station; averaging said measured signal strength to produce an average signal strength value; estimating a propagation loss from said mobile station to said at least one fixed station using said average signal strength value and said broadcast information; and estimating an appropriate transmitter power level for said mobile station to use in making a first transmission to said at least one fixed station using said estimated propagation loss.

Claim 2

Independent Claim 127 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a signal from at least one of said fixed stations; decoding said signal to obtain broadcast information; measuring the signal strength of said signal received from said at least one fixed station; averaging said measured signal strength to produce an average signal strength value; estimating a propagation loss from said mobile station to said at least one fixed station using said average signal strength value and said broadcast information; and estimating an appropriate transmitter power level for said mobile station to use in making a first transmission to said at least one fixed station using said estimated propagation loss.

Claim 3

Dependent Claim 21 words

A method in accordance with claim 1, wherein said broadcast information includes transmit power of said at least one fixed station.

Claim 4

Dependent Claim 41 words

A method in accordance with claim 1, wherein said broadcast information includes an adjustment for said appropriate transmitter power level representing a difference in antenna gain between a receive antenna and a transmit antenna of said at least one fixed station.

Claim 5

Independent Claim 122 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal strength of said first signal from said first fixed station; receiving at said mobile station at least a second signal from at least one other fixed station; measuring signal strength of said at least said second signal; estimating a propagation loss from said mobile station to said first fixed station using said signal strength measurements; and estimating an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station using said estimated propagation loss.

Claim 6

Independent Claim 122 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal strength of said first signal from said first fixed station; receiving at said mobile station at least a second signal from at least one other fixed station; measuring signal strength of said at least said second signal; estimating a propagation loss from said mobile station to said first fixed station using said signal strength measurements; and estimating an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station using said estimated propagation loss.

Claim 7

Dependent Claim 41 words

A method according to claim 4, wherein said step of estimating propagation loss includes subtracting said measured signal strengths from known transmit power levels of said first fixed station and said at least one other fixed station in said mobile station.

Claim 8

Dependent Claim 32 words

A method according to claim 4, wherein said step of estimating propagation loss includes estimating a position of said mobile station relative to said first fixed station using said signal strength measurements.

Claim 9

Independent Claim 124 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a signal from at least one of said plurality of fixed stations; decoding said signal to obtain broadcast information; measuring signal strength of said signal received from said at least one fixed station; averaging said measured signal strength to produce an average signal strength value; and estimating a propagation delay from said mobile station to said at least one fixed station using said average signal strength value and said decoded broadcast information, and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said at least one fixed station.

Claim 10

Independent Claim 124 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a signal from at least one of said plurality of fixed stations; decoding said signal to obtain broadcast information; measuring signal strength of said signal received from said at least one fixed station; averaging said measured signal strength to produce an average signal strength value; and estimating a propagation delay from said mobile station to said at least one fixed station using said average signal strength value and said decoded broadcast information, and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said at least one fixed station.

Claim 11

Dependent Claim 21 words

A method in accordance with claim 7, wherein said broadcast information includes transmit power of said at least one fixed station.

Claim 12

Dependent Claim 27 words

A method in accordance with claim 7, wherein said broadcast information includes a signal strength profile at various points relative to said at least one fixed station.

Claim 13

Independent Claim 115 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said plurality of fixed stations; measuring signal strength of said first signal; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal strength of said at least one second signal; and estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 14

Independent Claim 115 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said plurality of fixed stations; measuring signal strength of said first signal; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal strength of said at least one second signal; and estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 15

Dependent Claim 50 words

A method according to claim 10, wherein said step of estimating a propagation delay includes estimating a position of said mobile station relative to said first fixed station and said at least one other fixed station using said signal strength measurements and thereby the propagation delay expected at said position.

Claim 16

Independent Claim 118 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal timing of said first signal from said first fixed station; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal timing of said at least one second signal; and estimating a propagation delay from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 17

Independent Claim 118 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal timing of said first signal from said first fixed station; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal timing of said at least one second signal; and estimating a propagation delay from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 18

Independent Claim 113 words

A method of establishing communications between a mobile radio station and at least one of a network of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal timing of said first signal; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal timing of said at least one second signal; and estimating a propagation loss from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station.

Claim 19

Independent Claim 113 words

A method of establishing communications between a mobile radio station and at least one of a network of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal timing of said first signal; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal timing of said at least one second signal; and estimating a propagation loss from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station.

Claim 20

Independent Claim 136 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal strength and timing of said first signal from said first fixed station; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal strength of said at least one second signal from at least one other fixed station; estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements; and determining an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station using both said propagation delay estimate and said timing measurement.

Claim 21

Independent Claim 136 words

A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising: receiving at said mobile station a first signal from a first of said fixed stations; measuring signal strength and timing of said first signal from said first fixed station; receiving at said mobile station at least one second signal from at least one other fixed station; measuring signal strength of said at least one second signal from at least one other fixed station; estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements; and determining an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station using both said propagation delay estimate and said timing measurement.

Claim 22

Independent Claim 76 words

A method of establishing communications between a mobile station and at least one of a plurality of fixed stations, said method comprising the steps of: receiving at said mobile station signals from at least a first, second and third of said fixed stations and making timing measurements on said signals; and combining said timing measurements to estimate a transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 23

Independent Claim 76 words

A method of establishing communications between a mobile station and at least one of a plurality of fixed stations, said method comprising the steps of: receiving at said mobile station signals from at least a first, second and third of said fixed stations and making timing measurements on said signals; and combining said timing measurements to estimate a transmitter timing for said mobile station to use in making a first transmission to said first fixed station.

Claim 24

Dependent Claim 179 words

A method according to claim 15, wherein said step of combining includes the steps of: comparing the timing measurements on a first fixed station and a second fixed station to determine a delta timing between the first station and the second station which places the mobile station on a first hyperbola having the first and second stations at its foci; comparing the timing measurements on a second fixed station and a third fixed station to determine a delta timing between the second station and the third station which places the mobile station on a second hyperbola having the second and third stations at its foci; solving for the intersection of the first and second hyperbolae to determine the position of the mobile station and therefore the mobile station's distance from the first station; estimating a propagation delay to the first station from said distance; and, combined with the timing received from the first station, determining the transmit timing needed to compensate for propagation delay such that the transmitted signal is received at the first station with a desired timing.

Claim 25

Dependent Claim 38 words

A method according to claim 16, wherein said step of combining further comprises the steps of: pre-computing propagation delay as a function of possible delta-timing values in steps of each value, and storing the result in a table.

Claim 26

Dependent Claim 76 words

A method according to claim 16, wherein said step of combining further comprises the steps of: broadcasting from each of said fixed stations a value representing distance to neighboring fixed stations thereby providing the mobile station lengths of sides of a triangle formed by three base stations, and, together with the delta-timing measurements, solving hyperbolic navigation equations for the distance of the mobile station from the station with which the mobile station is to initiate communications.

Claim 27

Independent Claim 123 words

A method of controlling transmitter power for transmitting from a mobile station to a plurality of fixed stations, said method comprising: receiving at said mobile station a signal transmitted from a first of said fixed stations; measuring signal strength of said first signal from said first fixed station; receiving at said mobile station at least one second signal transmitted from at least one other fixed station; measuring signal strength of said at least one second signal from at least one other fixed station; determining an appropriate transmitter power for said mobile station to use for transmitting to said plurality of fixed stations using a combination of said signal strength measurements; and controlling the transmitter power of said mobile station at the determined level.

Claim 28

Independent Claim 123 words

A method of controlling transmitter power for transmitting from a mobile station to a plurality of fixed stations, said method comprising: receiving at said mobile station a signal transmitted from a first of said fixed stations; measuring signal strength of said first signal from said first fixed station; receiving at said mobile station at least one second signal transmitted from at least one other fixed station; measuring signal strength of said at least one second signal from at least one other fixed station; determining an appropriate transmitter power for said mobile station to use for transmitting to said plurality of fixed stations using a combination of said signal strength measurements; and controlling the transmitter power of said mobile station at the determined level.

Claim 29

Dependent Claim 59 words

A method in accordance with claim 19, comprising the further step of: decoding information including power control information transmitted by said first station, wherein said step of determining an appropriate transmitter power for said mobile station to use for transmitting to said plurality of fixed stations using a combination of said signal strength measurements and said power control information.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2000-09-22	2001-03-24	2001-09-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2004-09-22	2005-03-24	2005-09-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2008-09-22	2009-03-24	2009-09-23	$7700.00	Window Closed / Lapsed

Navigation assistance for call handling in mobile telephone systems

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