US6334059B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified transmission method for improving accuracy for e-911 calls
Assignee: Qualcomm Inc
•
Filing: 2000-03-31
•
Granted: 2001-12-25
•
Expires: 2020-03-31
Abstract
Abstract The accuracy of the location estimate of a Wireless Location System is dependent, in part, upon both the transmitted power of the wireless transmitter and the length in time of the transmission from the wireless transmitter. In general, higher power transmissions and transmissions of greater transmission length can be located with better accuracy by the Wireless Location System than lower power and shorter transmissions. Wireless communications systems generally limit the transmit power and transmission length of wireless transmitters in order to minimize interference within the communications system and to maximize the potential capacity of the system. The inventive method disclosed herein meets the conflicting needs of both systems by enabling the wireless communications system to minimize transmit power and length while enabling improved location accuracy for certain types of calls, such as wireless 9-1-1 calls. The method comprises the following steps: a wireless transmitter receives normal transmission parameters from a base station; the user of the wireless transmitter initiates a call on the wireless transmitter by dialing a sequence of digits and pressing "SEND" or "YES"; a processor within the wireless transmitter compares the dialed sequence of digits with one or more trigger events stored within the wireless transmitter; if the dialed sequence of digits does not match the trigger event, then the wireless transmitter uses the normal transmission parameters in making the call; and if the dialed sequence of digits matches the trigger event, then the wireless transmitter uses a modified transmission sequence.
Inventors
- 👤 Louis A. Stilp
- 👤 Robert J. Anderson
- 👤 Joseph W. Sheehan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:45
CPC Classifications
H; H04; H04W; H04W64/00; G; G01; G01S; G01S5/00; G01S5/02; G01S5/0205; G01S5/021; G01S5/06; H04W4/00; H04W4/90; H04W76/00; H04W76/50; G01S1/00; G01S1/02; G01S1/022; G01S1/026; G01S2205/00; G01S2205/001; G01S2205/006; G01S2205/008
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
128 words
A method for use in a Wireless Location System (WLS) in locating a mobile wireless transmitter, comprising the steps of: a) a wireless transmitter receives normal transmission parameters from a base station; b) the user of the wireless transmitter initiates a call on the wireless transmitter by dialing a sequence of digits and pressing “SEND” or “YES”; c) a processor within the wireless transmitter compares the dialed sequence of digits with one or more trigger events stored within the wireless transmitter; d) if the dialed sequence of digits does not match the trigger event, then the wireless transmitter uses the normal transmission parameters in making the call; and e) if the dialed sequence of digits matches the trigger event, then the wireless transmitter uses a modified transmission sequence.
Claim 2
Independent Claim
128 words
A method for use in a Wireless Location System (WLS) in locating a mobile wireless transmitter, comprising the steps of: a) a wireless transmitter receives normal transmission parameters from a base station; b) the user of the wireless transmitter initiates a call on the wireless transmitter by dialing a sequence of digits and pressing “SEND” or “YES”; c) a processor within the wireless transmitter compares the dialed sequence of digits with one or more trigger events stored within the wireless transmitter; d) if the dialed sequence of digits does not match the trigger event, then the wireless transmitter uses the normal transmission parameters in making the call; and e) if the dialed sequence of digits matches the trigger event, then the wireless transmitter uses a modified transmission sequence.
Claim 3
Dependent Claim
40 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter increasing its transmitted power by a predetermined amount over the power level setting in the normal parameters, up to a maximum power setting.
Claim 4
Dependent Claim
26 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter increasing its transmitted power to the maximum power setting.
Claim 5
Dependent Claim
41 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter transmitting an additional predetermined number of access probes even after the base station has acknowledged receipt of the access probes to the wireless transmitter.
Claim 6
Dependent Claim
43 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter including additional fields in the transmitted message even if these fields are not requested in the normal parameters broadcast on forward channels by the base station.
Claim 7
Dependent Claim
16 words
A method as recited in claim 5 , wherein the additional field is an Authentication field.
Claim 8
Dependent Claim
17 words
A method as recited in claim 5 , wherein the additional field is a Serial Number field.
Claim 9
Dependent Claim
20 words
A method as recited in claim 5 , wherein the additional field is a Mobile Assisted Channel Allocation Report field.
Claim 10
Dependent Claim
28 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter following a transmitted message with one or more repeated registration messages.
Claim 11
Dependent Claim
36 words
A method as recited in claim 9 , wherein the one or more repeated registration messages may be of the normal length determined from the transmission parameters broadcast on the forward channels by the base station.
Claim 12
Dependent Claim
27 words
A method as recited in claim 9 , wherein the one or more repeated registration messages may be modified to a longer length by including additional fields.
Claim 13
Dependent Claim
48 words
A method as recited in claim 1 , wherein the modified transmission sequence comprises the wireless transmitter following a transmitted message transmitted on a first one of a plurality of channels with one or more repeated registration messages transmitted on another second one of a plurality of channels.
Claim 14
Dependent Claim
36 words
A method as recited in claim 12 , wherein the one or more repeated registration messages may be of the normal length determined from the transmission parameters broadcast on the forward channels by the base station.
Claim 15
Dependent Claim
27 words
A method as recited in claim 12 , wherein the one or more repeated registration messages may be modified to a longer length by including additional fields.
Claim 16
Independent Claim
18 words
A method as recited in claims 11 or 14 , wherein the additional field is an Authentication field.
Claim 17
Independent Claim
19 words
A method as recited in claims 11 or 14 , wherein the additional field is a Serial Number field.
Claim 18
Independent Claim
22 words
A method as recited in claims 11 or 14 , wherein the additional field is a Mobile Assisted Channel Allocation Report field.
Claim 19
Independent Claim
19 words
A method as recited in claims 11 or 14 , wherein the additional field is a Capability Report field.
Claim 20
Dependent Claim
54 words
A method as recited in claim 12 , wherein the second one of a plurality of channels is selected to be one in use by a second base station within listening range of the wireless transmitter and for which the wireless transmitter can receive the forward control channel broadcast by that second base station.
Claim 21
Dependent Claim
38 words
A method as recited in claim 12 , wherein the second one of a plurality of channels is selected to be one for which the wireless transmitter can detect no forward control channel activity by any base station.
Claim 22
Dependent Claim
35 words
A method as recited in claim 19 , wherein the second base station may be the same as the first base station, another sector of the first base station, or an entirely separate base station.
Claim 23
Dependent Claim
29 words
A method as recited in claim 20 , wherein the wireless transmitter will transmit the one or more registration messages without expecting any acknowledgement from the wireless communications system.
Claim 24
Dependent Claim
19 words
A method as recited in claim 1 , wherein the trigger events are permanently stored in the wireless transmitter.
Claim 25
Dependent Claim
21 words
A method as recited in claim 1 , wherein the trigger events are programmed by the user into the wireless transmitter.
Claim 26
Dependent Claim
27 words
A method as recited in claim 1 , wherein the trigger events are broadcast by the wireless communications system for receipt by a plurality of wireless transmitters.
Claim 27
Dependent Claim
27 words
A method as recited in claim 1 , wherein the actions to be taken during the modified transmission sequence may be permanently stored in the wireless transmitter.
Claim 28
Dependent Claim
28 words
A method as recited in claim 1 , wherein the actions to be taken during the modified transmission sequence are programmed by the user into the wireless transmitter.
Claim 29
Dependent Claim
32 words
A method as recited in claim 1 , wherein the actions to be taken during the modified transmission sequence are broadcast by the wireless communications system for receipt by all wireless transmitters.
Claim 30
Dependent Claim
24 words
A method as recited in claim 1 , wherein the trigger event includes the dialed digits “9-1-1” and/or variations such as “*9-1-1” or “#9-1-1”.
Claim 31
Dependent Claim
19 words
A method as recited in claim 1 , wherein the wireless transmitter deactivates encryption when a trigger event occurs.
Claim 32
Dependent Claim
25 words
A method as recited in claim 1 , wherein the wireless transmitter deactivates encryption for all messages transmitted as part of the modified transmission sequence.
Claim 33
Dependent Claim
103 words
A wireless transmitter for use in a wireless communications system, capable of performing the following functions: a) receiving normal transmission parameters from a base station; b) initiating a call when a user of the wireless transmitter dials a sequence of digits and presses “SEND” or “YES”; c) comparing the dialed sequence of digits with one or more trigger events stored within the wireless transmitter; d) using the normal transmission parameters in making the call if the dialed sequence of digits do not match the trigger event; and e) using a modified transmission sequence if the dialed sequence of digits matches the trigger event.
Claim 34
Dependent Claim
103 words
A wireless transmitter for use in a wireless communications system, capable of performing the following functions: a) receiving normal transmission parameters from a base station; b) initiating a call when a user of the wireless transmitter dials a sequence of digits and presses “SEND” or “YES”; c) comparing the dialed sequence of digits with one or more trigger events stored within the wireless transmitter; d) using the normal transmission parameters in making the call if the dialed sequence of digits do not match the trigger event; and e) using a modified transmission sequence if the dialed sequence of digits matches the trigger event.
Claim 35
Dependent Claim
41 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter increasing its transmitted power by a predetermined amount over the power level setting in the normal parameters, up to a maximum power setting.
Claim 36
Dependent Claim
27 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter increasing its transmitted power to the maximum power setting.
Claim 37
Dependent Claim
42 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter transmitting an additional predetermined number of access probes even after the base station has acknowledged receipt of the access probes to the wireless transmitter.
Claim 38
Dependent Claim
44 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter including additional fields in the transmitted message even if these fields are not requested in the normal parameters broadcast on forward channels by the base station.
Claim 39
Dependent Claim
17 words
A wireless transmitter as recited in claim 36 , wherein the additional field is an Authentication field.
Claim 40
Dependent Claim
18 words
A wireless transmitter as recited in claim 36 , wherein the additional field is a Serial Number field.
Claim 41
Dependent Claim
21 words
A wireless transmitter as recited in claim 36 , wherein the additional field is a Mobile Assisted Channel Allocation Report field.
Claim 42
Dependent Claim
37 words
A wireless transmitter as recited in claim 36 , wherein the one or more repeated registration messages may be of the normal length determined from the transmission parameters broadcast on the forward channels by the base station.
Claim 43
Dependent Claim
29 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter following a transmitted message with one or more repeated registration messages.
Claim 44
Dependent Claim
28 words
A wireless transmitter as recited in claim 41 , wherein the one or more repeated registration messages may be modified to a longer length by including additional fields.
Claim 45
Dependent Claim
49 words
A wireless transmitter as recited in claim 32 , wherein the modified transmission sequence comprises the wireless transmitter following a transmitted message transmitted on a first one of a plurality of channels with one or more repeated registration messages transmitted on another second one of a plurality of channels.
Claim 46
Dependent Claim
37 words
A wireless transmitter as recited in claim 43 , wherein the one or more repeated registration messages may be of the normal length determined from the transmission parameters broadcast on the forward channels by the base station.
Claim 47
Dependent Claim
28 words
A wireless transmitter as recited in claim 43 , wherein the one or more repeated registration messages may be modified to a longer length by including additional fields.
Claim 48
Dependent Claim
19 words
A wireless transmitter as recited in claims 42 or 45 , wherein the additional field is an Authentication field.
Claim 49
Dependent Claim
20 words
A wireless transmitter as recited in claims 42 or 45 , wherein the additional field is a Serial Number field.
Claim 50
Dependent Claim
23 words
A wireless transmitter as recited in claims 42 or 45 , wherein the additional field is a Mobile Assisted Channel Allocation Report field.
Claim 51
Dependent Claim
20 words
A wireless transmitter as recited in claims 42 or 45 , wherein the additional field is a Capability Report field.
Claim 52
Dependent Claim
55 words
A wireless transmitter as recited in claim 43 , wherein the second one of a plurality of channels is selected to be one in use by a second base station within listening range of the wireless transmitter and for which the wireless transmitter can receive the forward control channel broadcast by that second base station.
Claim 53
Dependent Claim
39 words
A wireless transmitter as recited in claim 43 , wherein the second one of a plurality of channels is selected to be one for which the wireless transmitter can detect no forward control channel activity by any base station.
Claim 54
Dependent Claim
36 words
A wireless transmitter as recited in claim 50 , wherein the second base station may be the same as the first base station, another sector of the first base station, or an entirely separate base station.
Claim 55
Dependent Claim
30 words
A wireless transmitter as recited in claim 51 , wherein the wireless transmitter will transmit the one or more registration messages without expecting any acknowledgement from the wireless communications system.
Claim 56
Dependent Claim
20 words
A wireless transmitter as recited in claim 32 , wherein the trigger events are permanently stored in the wireless transmitter.
Claim 57
Dependent Claim
22 words
A wireless transmitter as recited in claim 32 , wherein the trigger events are programmed by the user into the wireless transmitter.
Claim 58
Dependent Claim
28 words
A wireless transmitter as recited in claim 32 , wherein the trigger events are broadcast by the wireless communications system for receipt by a plurality of wireless transmitters.
Claim 59
Dependent Claim
28 words
A wireless transmitter as recited in claim 32 , wherein the actions to be taken during the modified transmission sequence may be permanently stored in the wireless transmitter.
Claim 60
Dependent Claim
29 words
A wireless transmitter as recited in claim 32 , wherein the actions to be taken during the modified transmission sequence are programmed by the user into the wireless transmitter.
Claim 61
Dependent Claim
33 words
A wireless transmitter as recited in claim 32 , wherein the actions to be taken during the modified transmission sequence are broadcast by the wireless communications system for receipt by all wireless transmitters.
Claim 62
Dependent Claim
25 words
A wireless transmitter as recited in claim 32 , wherein the trigger event includes the dialed digits “9-1-1” and/or variations such as “*9-1-1” or “#9-1-1”.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-12-24 | 2005-06-25 | 2005-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-12-24 | 2009-06-25 | 2009-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-12-24 | 2013-06-25 | 2013-12-25 | $7700.00 | Window Closed / Lapsed |