US6590533B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for enhanced 911 location using power control in a wireless system
Assignee: AT&T Mobility II LLC
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Filing: 2002-05-24
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Granted: 2003-07-08
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Expires: 2022-05-24
Abstract
Abstract A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone, the call including a dialed number and a TDMA signal. In the transmitting step, the base station transmits a control message to the mobile telephone when the dialed number meets a predetermined criterion, such as being 911. The control message instructs the mobile telephone to transmit the TDMA signal at a maximum power. In the increasing step, the mobile telephone increases the TDMA signal to maximum power in response to the control message. Then in the determining step, location information for the mobile telephone is determined based on at least one characteristic of the TDMA signal received at at least one of the first base station and other base stations. In an alternate embodiment, the method is practiced in a mobile telephone and the power level is automatically increased in response to the dialed number meeting a predetermined criterion.
Inventors
- 👤 Nelson Ray Sollenberger
- 👤 Jack Harriman Winters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:22
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/28; H04W52/283; G; G01; G01S; G01S5/00; G01S5/01; G01S5/019; G01S5/02; H04W4/00; H04W4/02; H04W4/029; H04W52/30; H04W52/36; H04W52/367; G01S2205/00; G01S2205/01; G01S2205/06; H04W4/90; H04W52/38; H04W52/50; H04W76/00; H04W76/50; H04W8/00; H04W8/18
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
88 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a call from a mobile telephone, the call including a dialed number and a signal; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit the signal at a maximum power; increasing the signal to maximum power in response to the control message; and determining location information for the mobile telephone based on at least one characteristic of the signal received at the base station.
Claim 2
Independent Claim
88 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a call from a mobile telephone, the call including a dialed number and a signal; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit the signal at a maximum power; increasing the signal to maximum power in response to the control message; and determining location information for the mobile telephone based on at least one characteristic of the signal received at the base station.
Claim 3
Dependent Claim
27 words
The method according to claim 1 , wherein the at least one characteristic of the signal is the time of arrival of a portion of the signal.
Claim 4
Dependent Claim
24 words
The method according to claim 1 , wherein the at least one characteristic of the signal is the angle of arrival of the signal.
Claim 5
Dependent Claim
41 words
The method according to claim 1 , further comprising: receiving a MN from the mobile telephone; querying a user profile database with the MN to determine whether the location function should be invoked; and invoking location function based on the query.
Claim 6
Dependent Claim
30 words
The method according to claim 1 , further comprising: receiving a dialed number from the mobile telephone; and invoking the location function when the dialed number meets a predetermined criterion.
Claim 7
Dependent Claim
38 words
The method according to claim 1 , further comprising: determining location information for the mobile telephone based on pre-specified data comprised by the signal received at the base station, the pre-specified data selected to assist in location determination.
Claim 8
Dependent Claim
19 words
The method according to claim 6 , further comprising: providing the location information to a recipient of the call.
Claim 9
Dependent Claim
26 words
The method according to claim 7 , further comprising: providing the location information to a geographic information system for displaying the location information on a map.
Claim 10
Independent Claim
110 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a signal from a mobile telephone; invoking a location function in response to the signal; determining whether the mobile telephone should increase power for location determination; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit a signal at an increased power level based on the determining; receiving at least one of a plurality of base stations the signal transmitted at the increased power level; and calculating a location of the mobile telephone based on the signal received at least one of the plurality of base stations.
Claim 11
Independent Claim
110 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a signal from a mobile telephone; invoking a location function in response to the signal; determining whether the mobile telephone should increase power for location determination; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit a signal at an increased power level based on the determining; receiving at least one of a plurality of base stations the signal transmitted at the increased power level; and calculating a location of the mobile telephone based on the signal received at least one of the plurality of base stations.
Claim 12
Dependent Claim
46 words
The method of claim 9 , further comprising: calculating a location of the mobile telephone based at least in part on pre-specified data comprised by the signal received at least one of the plurality of base stations, the pre-specified data selected to assist in location determination.
Claim 13
Dependent Claim
29 words
The method according to claim 9 , wherein determining is performed based on the time of arrival of the signal at least one of the plurality of base stations.
Claim 14
Dependent Claim
29 words
The method according to claim 9 , wherein determining is performed based on the angle of arrival of the signal at least one of the plurality of base stations.
Claim 15
Dependent Claim
41 words
The method according to claim 9 , further comprising: receiving a MN from the mobile telephone; querying a user profile database with the MN to determine whether the location function should be invoked; and invoking location function based on the query.
Claim 16
Dependent Claim
30 words
The method according to claim 9 , further comprising: receiving a dialed number from the mobile telephone; and invoking the location function when the dialed number meets a predetermined criterion.
Claim 17
Independent Claim
144 words
An apparatus for locating a mobile telephone, the apparatus comprising: a plurality of base stations communicating signals with a mobile telephone; a mobile switching center, coupled with the plurality of base stations, the mobile switching center a) receiving from one of the plurality of base stations a call that includes a dialed number of the mobile telephone, b) determining whether the dialed number invokes a location function, and c) sending an instruction to the mobile telephone via one of the plurality of base stations to increase transmission power when the location function is invoked; and a location processor, coupled with the plurality of base stations and the mobile switching center, the location processor determining the location of the mobile telephone based on the signals received from the mobile telephone via at least one of the plurality of base stations at the increased power level.
Claim 18
Independent Claim
144 words
An apparatus for locating a mobile telephone, the apparatus comprising: a plurality of base stations communicating signals with a mobile telephone; a mobile switching center, coupled with the plurality of base stations, the mobile switching center a) receiving from one of the plurality of base stations a call that includes a dialed number of the mobile telephone, b) determining whether the dialed number invokes a location function, and c) sending an instruction to the mobile telephone via one of the plurality of base stations to increase transmission power when the location function is invoked; and a location processor, coupled with the plurality of base stations and the mobile switching center, the location processor determining the location of the mobile telephone based on the signals received from the mobile telephone via at least one of the plurality of base stations at the increased power level.
Claim 19
Dependent Claim
36 words
The apparatus according to claim 15 , further comprising: a geographic information system, coupled with the location processor, the geographic information system receiving the location from the location processor and plotting the location on a map.
Claim 20
Dependent Claim
33 words
The apparatus according to claim 15 , further comprising: a public switched telephone network, coupled to the mobile switching center, for transmitting a call to a destination telephone corresponding to the dialed number.
Claim 21
Dependent Claim
32 words
The apparatus according to claim 15 , wherein the mobile switching center further determines whether the call invokes the location function based on a mobile identification number received from the mobile telephone.
Claim 22
Dependent Claim
42 words
The apparatus of claim 15 , the location processor determining the location of the mobile telephone based at least in part on pre-specified data comprised by the signals received from the mobile telephone, the pre-specified data selected to assist in location determination.
Claim 23
Independent Claim
103 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a call from a mobile telephone, the call including a dialed number and a signal; invoking a location function in one of a mobile switching center and a location system; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit the signal at a maximum power; increasing the signal to maximum power in response to the control message; and determining location information for the mobile telephone based on at least one characteristic of the signal received at the base station.
Claim 24
Independent Claim
103 words
A method of locating a mobile telephone, the method comprising: receiving at a base station a call from a mobile telephone, the call including a dialed number and a signal; invoking a location function in one of a mobile switching center and a location system; transmitting from the base station to the mobile telephone a control message instructing the mobile telephone to transmit the signal at a maximum power; increasing the signal to maximum power in response to the control message; and determining location information for the mobile telephone based on at least one characteristic of the signal received at the base station.
Claim 25
Dependent Claim
20 words
The method of claim 20 further comprising: invoking the location function according to a result of an A/B number analysis.
Claim 26
Independent Claim
67 words
A method comprising: a mobile telephone determining to transmit at a higher-than-normal operating power level according to a number to dial; the mobile telephone placing a call to the number to dial and transmitting at the higher power level; the mobile telephone receiving a signal in response to successful location determination of the mobile phone; the mobile telephone decreasing transmission power in response to receiving the signal.
Claim 27
Independent Claim
67 words
A method comprising: a mobile telephone determining to transmit at a higher-than-normal operating power level according to a number to dial; the mobile telephone placing a call to the number to dial and transmitting at the higher power level; the mobile telephone receiving a signal in response to successful location determination of the mobile phone; the mobile telephone decreasing transmission power in response to receiving the signal.
Claim 28
Dependent Claim
21 words
The method of claim 22 further comprising: the mobile telephone receiving and displaying information describing the location of the mobile telephone.
References Cited (Backward Citations)
US4818998A
Cited
US4891650A
Cited
US5055851A
Cited
US5208756A
Cited
US5218367A
Cited
US5493694A
Cited
US5742666A
Cited
US5461365A
Cited
US5650770A
Cited
US5736964A
Cited
US5508708A
Cited
US5764188A
Cited
US5732354A
Cited
US5767788A
Cited
US5893036A
Cited
US5973643A
Cited
US6172644B1
Cited
US6184829B1
Cited
US6334059B1
Cited
US6404388B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-07-07 | 2007-01-06 | 2007-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-07-07 | 2011-01-06 | 2011-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-07-07 | 2015-01-06 | 2015-07-08 | $7700.00 | Window Closed / Lapsed |