Automatic location identification (ALI) emergency services pseudo key (ESPK)
First Claim
1. An emergency services pseudo key replacement module, comprising:
- a plurality of emergency services pseudo keys (ESPKs); and
a positioning center maintaining said plurality of ESPKs;
wherein said positioning center receives an emergency services query key (ESQK) or emergency services routing key (ESRK), and replaces said ESQK or ESRK identifying a query message with one of said plurality of ESPKs to identify a response message in response to said query message.
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Accused Products
Abstract
ESQK and/or ESRK (ESxK) number pool exhaustion and reuse errors are eliminated by replacing the ESxK identifier with an emergency services pseudo key (ESPK) identifier. A positioning center (MPC/VPC) replaces an ESxK received with a query with a ESPK in a return message. The ESPK is either a unique 10-digit number or unique alpha-numeric identifier that can be used to re-query the source of dynamic ALI data. The ESPK may be generated using, e.g., unique prefixing, suffixing, or randomizing. The ESPK is a non-constrained, unique identifier that preferably remains unique for the call instance over an extended period of time. The ESPK is used for any subsequent ALI request for the call. Each time a positioning center receives a query with ESPK, it is directly associated with, and returns, the updated location for the original emergency call, regardless of whether or not the original ESxK was reallocated to another emergency call.
199 Citations
28 Claims
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1. An emergency services pseudo key replacement module, comprising:
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a plurality of emergency services pseudo keys (ESPKs); and a positioning center maintaining said plurality of ESPKs; wherein said positioning center receives an emergency services query key (ESQK) or emergency services routing key (ESRK), and replaces said ESQK or ESRK identifying a query message with one of said plurality of ESPKs to identify a response message in response to said query message. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier, comprising:
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receiving a query message identified with a constrained emergency services key (ESxK); obtaining a non-constrained emergency services pseudo key (ESPK); and sending a response to said query message, said response to said query message being identified with a non-constrained emergency services pseudo key (ESPK) in replacement of said constrained ESxK received with said message. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Apparatus for replacing a constrained emergency services key identifier received in a message with a non-constrained emergency services pseudo key identifier, comprising:
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means for receiving a query message identified with a constrained emergency services key (ESxK); means for obtaining a non-constrained emergency services pseudo key (ESPK); and means for sending a response to said query message, said response to said query message being identified with a non-constrained emergency services pseudo key (ESPK) in replacement of said constrained ESxK received with said message. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification