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System and method of handling emergency calls from roaming mobile stations in a radio telecommunications network
| Details |
Inventors: Bugnon, Jacques; Nguyen, Binh;
Assignee: Telefonaktiebolaget L M Ericsson (publ) (Stockholm, SE)
Primary Examiner: Hunter; Daniel
Assistant Examiner: Le; Lana
Attorney, Agent or Firm: Smith, Danamraj & Youst, P.C.
A system and method in a radio telecommunications network for reconnecting an emergency call between a roaming mobile station with an emergency (emergency MS) and a public safety answering point (PSAP) when the call has been disconnected before the call was finished. The network includes a serving mobile switching center (MSC) serving the emergency MS, a border MSC bordering the serving MSC, and a home location register (HLR) that stores features and subscription data for the emergency MS. When the emergency call begins, a hotlining feature for the emergency MS is activated in the HLR which automatically reconnects the emergency MS to the PSAP when the MS accesses the network through a registration or by originating a subsequent call. Inter-exchange messages ensure that the emergency MS is automatically connected to the PSAP, even if the emergency MS accesses the network in the border MSC. |
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DETAILED DESCRIPTION In one aspect, the present invention is a method in a radio telecommunications network of reconnecting an emergency call between a mobile station with an emergency (emergency MS) and a public safety answering point (PSAP) when the call has been disconnected before the call was finished.
The network includes a serving mobile switching center (MSC) serving the emergency MS, and a home location register (HLR) that stores features and subscription data for the emergency MS.
The method comprises the steps of activating a hotlining feature in the HLR when the emergency call is begun, determining that the emergency call was disconnected before the call was finished, determining that the emergency MS attempts to access the network after the emergency call was disconnected, and automatically connecting the emergency MS to the PSAP.
The network may include a plurality of MSCs, and the emergency MS may register in a second MSC other than the serving MSC after the hotlining feature has been activated.
The method then includes the steps of notifying the HLR that the emergency MS has registered in the second MSC, determining in the HLR that the emergency MS has an unfinished emergency call, and instructing the second MSC to connect the emergency MS to the PSAP.
If the emergency MS registers within the service area of a second MSC other than the serving MSC before the hotlining feature has been activated, the method includes the steps of sending a registration notification (REGNOT) message from the second MSC to the HLR, sending a registration cancellation (REGCANC) message from the HLR to the previous serving MSC identifying the emergency MS, and sending a return REGCANC message from the previous serving MSC to the HLR identifying that the emergency MS has an unfinished emergency call and providing a PSAP number to the HLR.
This is followed by sending a qualification directive (QUALDIR) message from the HLR to the second MSC with the PSAP number and instructions to connect the emergency MS to the PSAP
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