System and method of routing emergency services calls in a radio telecommunications network
First Claim
1. A method of routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network, said method comprising the steps of:
- intelligently selecting the PSAP from a plurality of PSAPs;
sending an alert signal to the selected PSAP prior to routing the call to the selected PSAP, said alert signal warning the PSAP that the emergency services call is coming and providing the PSAP with advanced information regarding the context of the call; and
routing the call to the selected PSAP.
1 Assignment
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Accused Products
Abstract
A system and method for routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network. The system intelligently selects the PSAP from a plurality of PSAPs, warns the selected PSAP that the emergency services call is coming prior to routing the call to the selected PSAP, and provides the selected PSAP with advanced information regarding the context of the call. The emergency services call is received by a serving mobile switching center (MSC) which determines that the call is an emergency services call and sends cell or sector information to a service control point (SCP). The SCP includes a PSAP selector which selects the PSAP based on such information as, for example, the location of the mobile station, the Local Access and Traffic Area (LATA) in which the mobile station is located, the time-of-day, and the day-of-week. The SCP then sends an alerting signal to the selected PSAP and includes a tag and information relating to the context of the call. The SCP then returns the tag and the identity of the selected PSAP to the serving MSC which determines the PSAP routing number and delivers the call to the selected PSAP.
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Citations
23 Claims
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1. A method of routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network, said method comprising the steps of:
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intelligently selecting the PSAP from a plurality of PSAPs; sending an alert signal to the selected PSAP prior to routing the call to the selected PSAP, said alert signal warning the PSAP that the emergency services call is coming and providing the PSAP with advanced information regarding the context of the call; and routing the call to the selected PSAP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network, said method comprising the steps of:
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transmitting the emergency services call from the mobile station to a serving mobile switching center (S-MSC); determining in said S-MSC that the call is an emergency services call; sending a first message from the S-MSC to a service control point (SCP), said first message including mobile station parameters and location parameters for said mobile station; intelligently selecting the PSAP in the SCP; sending an alert signal from the SCP to the selected PSAP, the alert signal including a tag identifying the call and information relating to the context of the call; sending a second message from the SCP to the S-MSC, said second message including an identity of the selected PSAP and the tag identifying the call; determining in the S-MSC, a routing number for the selected PSAP; and delivering the call from the S-MSC to the selected PSAP.
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14. A system for routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network, said system comprising:
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means for intelligently selecting the PSAP from a plurality of PSAPs; means for sending an alert signal to the selected PSAP prior to routing the call to the selected PSAP, said alert signal warning the PSAP that the emergency services call is coming and providing the PSAP with advanced information regarding the context of the call; and means for routing the call to the selected PSAP. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for routing an emergency services call from a mobile station to a selected Public Safety Answering Point (PSAP) in a radio telecommunications network, said system comprising:
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a serving mobile switching center (S-MSC) which receives the emergency services call from the mobile station, said S-MSC including an emergency services call analyzer which determines that the call is an emergency services call and informs a service control point (SCP) of the cell in which the call originated; a SCP connected to the S-MSC, said SCP including; a mobile station location analyzer for determining the location of the mobile station; an intelligent PSAP selector which intelligently selects the PSAP, sends an alert signal from the SCP to the selected PSAP prior to routing the call, and sends a message to the S-MSC identifying the selected PSAP; and a call tagger which places a tag identifying the call in the alert signal and in the message to the S-MSC identifying the selected PSAP; and means for delivering the emergency services call from the S-MSC to the selected PSAP.
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Specification