Modified transmission method for improving accuracy for E-911 calls
First Claim
1. 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.
2 Assignments
0 Petitions
Accused Products
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.
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Citations
61 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A wireless transmitter for use in a wireless communications system, capable of performing the following functions:
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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. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A Wireless Location System capable of locating a wireless transmitter using a modified transmission sequence, wherein the modified transmission sequence comprises a message sent from the wireless transmitter using transmission parameters different from the normal transmission parameters broadcast on the forward control channel by the base stations in a wireless communications system.
Specification