Directed retry method for use in a wireless location system
First Claim
1. A method for use in dual mode wireless communications systems, operated by one or more wireless carriers, supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, wherein a wireless transmitter is capable of supporting both modulation methods, and wherein it is preferred that emergency 911 calls generally take place with the first modulation method, comprising the steps of:
- when the wireless transmitter is currently using the second modulation method and attempts to originate a call to 911, causing the wireless transmitter automatically to switch to the first modulation method; and
originating the call to 911 using the first modulation method on one of the set of RF channels prescribed for use in the first modulation method.
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Abstract
A method for use in a dual mode wireless communication system supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, wherein a wireless transmitter is capable of supporting both modulation methods, and wherein it is preferred that emergency 911 calls generally take place with the first modulation method, comprising the steps of: when the wireless transmitter is currently using the second modulation method and attempts to originate a call to 911, causing the wireless transmitter automatically to switch to the first modulation method; and originating the call to 911 using the first modulation method on one of the set of RF channels prescribed for use in the first modulation method.
154 Citations
12 Claims
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1. A method for use in dual mode wireless communications systems, operated by one or more wireless carriers, supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, wherein a wireless transmitter is capable of supporting both modulation methods, and wherein it is preferred that emergency 911 calls generally take place with the first modulation method, comprising the steps of:
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when the wireless transmitter is currently using the second modulation method and attempts to originate a call to 911, causing the wireless transmitter automatically to switch to the first modulation method; and originating the call to 911 using the first modulation method on one of the set of RF channels prescribed for use in the first modulation method. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. A Wireless Location System employing a "directed retry" method for use in connection with dual-mode wireless communications systems supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, such as channels for the wireless communications system supporting the Wireless Location System (WLS) and a Personal Communications System (PCS) system, respectively, and wherein a wireless transmitter to be located is capable of supporting both modulation methods, wherein the "directed retry" method comprises the step of, when the wireless transmitter is currently using the PCS modulation method and attempts to originate a call to 911, the wireless transmitter is caused to switch automatically to the first modulation method, and then to originate the call to 911 using the first modulation method on one of the set of RF channels prescribed for use by the wireless communications system, whereby location services can be provided to customers of a PCS system that is not served by its own Wireless Location System.
Specification