Method and apparatus for handling emergency calls in a packet switched radio access network
First Claim
1. A method in a multimedia service network of providing location information to an emergency center in a circuit-switched network for a mobile radio terminal connected to a packet-switched mobile access network, comprising the following steps:
- receiving a packet-switched emergency request from the mobile radio terminal containing a calling number,sending a location query for said calling number to a mobile radio terminal positioning center in a mobile radio access network when more detailed location information is needed,receiving a location indication for the mobile radio terminal in response to the location query,translating the packet-switched emergency request into a circuit-switched control message for said emergency request, andsending the translated circuit-switched control message including the location indication for the mobile radio terminal to the emergency center according to prevailing standards for initiating a circuit-switched emergency call,wherein the method is executed in a media gateway control function node, coupled to the mobile radio terminal positioning center, a packet-switched core network node coupled to the mobile radio access network, and the emergency center, that translates packet-switched signalling messages into circuit-switched signalling messages to emulate the behavior of a circuit-switched network towards the emergency center,wherein the multimedia service network is an IP Multimedia Subsystem (IMS) network using Session Initiation Protocol (SIP) signalling, andwherein the emergency request is an SIP INVITE message.
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Accused Products
Abstract
A method and apparatus for providing location information for subscribers connected to a packet-switched mobile access network in connection with emergency calls made over a multimedia service network. An emergency request is received at the multimedia service network from a subscriber containing the calling number of the subscriber. In response thereto, a media gateway control function in the multimedia service network sends a location query including the calling number to a mobile positioning center in the mobile access network, which then can retrieve location information for the subscriber. After receiving location information from the mobile positioning center, the media gateway control function selects an emergency center and sends a location indication for the subscriber thereto in a circuit-switched control message for initiating an emergency call, according to prevailing standards.
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Citations
14 Claims
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1. A method in a multimedia service network of providing location information to an emergency center in a circuit-switched network for a mobile radio terminal connected to a packet-switched mobile access network, comprising the following steps:
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receiving a packet-switched emergency request from the mobile radio terminal containing a calling number, sending a location query for said calling number to a mobile radio terminal positioning center in a mobile radio access network when more detailed location information is needed, receiving a location indication for the mobile radio terminal in response to the location query, translating the packet-switched emergency request into a circuit-switched control message for said emergency request, and sending the translated circuit-switched control message including the location indication for the mobile radio terminal to the emergency center according to prevailing standards for initiating a circuit-switched emergency call, wherein the method is executed in a media gateway control function node, coupled to the mobile radio terminal positioning center, a packet-switched core network node coupled to the mobile radio access network, and the emergency center, that translates packet-switched signalling messages into circuit-switched signalling messages to emulate the behavior of a circuit-switched network towards the emergency center, wherein the multimedia service network is an IP Multimedia Subsystem (IMS) network using Session Initiation Protocol (SIP) signalling, and wherein the emergency request is an SIP INVITE message. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An arrangement in a multimedia service network for providing location information to an emergency center in a circuit-switched network for a mobile radio terminal connected to a packet-switched mobile access network, comprising:
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means for receiving a packet-switched emergency request from the mobile radio terminal containing a calling number, means for sending a location query for said calling number to a mobile radio terminal positioning center in a mobile radio access network when more detailed location information is needed, means for receiving a location indication for the mobile radio terminal in response to the location query, means for translating the packet-switched emergency request into a circuit-switched control message for said emergency request, and means for sending the translated circuit-switched control message including the location indication for the mobile radio terminal to the emergency center according to prevailing standards for initiating a circuit-switched emergency call, wherein the arrangement is implemented in a media gateway control function node coupled to the mobile radio terminal positioning center, to a packet-switched core network node, and to the emergency center, the media gateway control function node being configured to translate packet-switched signalling messages into circuit-switched signalling messages to emulate the behavior of a circuit-switched network towards the emergency center, wherein the multimedia service network is an IMS network using SIP signalling, and wherein said emergency request is an SIP INVITE message. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification