Emergency Call Handling
First Claim
1. A user terminal for use with a communications system, the user terminal comprising:
- a non-volatile memory;
a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module;
a recording unit for recording a used and authenticated subscriber identity in said non-volatile memory; and
an emergency call initiation unit configured to initiate an unauthenticated emergency call in the absence of a subscriber identity module, and to retrieve said used and authenticated subscriber identity from said non-volatile memory and to provide the retrieved subscriber identity to the communications system during the initiation.
1 Assignment
0 Petitions
Accused Products
Abstract
A user terminal for use with a communications system. The user terminal comprises a non-volatile memory and a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module. A recording unit is provided for recording a used and authenticated subscriber identity in said non-volatile memory, whilst an emergency call initiation unit is configured to initiate an unauthenticated emergency call in the absence of a subscriber identity module, and to retrieve said used and authenticated subscriber identity from said non-volatile memory and to provide the retrieved subscriber identity to the communications system during the initiation.
21 Citations
19 Claims
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1. A user terminal for use with a communications system, the user terminal comprising:
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a non-volatile memory; a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module; a recording unit for recording a used and authenticated subscriber identity in said non-volatile memory; and an emergency call initiation unit configured to initiate an unauthenticated emergency call in the absence of a subscriber identity module, and to retrieve said used and authenticated subscriber identity from said non-volatile memory and to provide the retrieved subscriber identity to the communications system during the initiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A user terminal for use with a communications system, the user terminal comprising:
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a non-volatile memory; a subscriber identity authentication unit configured in use to communicate with a removable subscriber identity module and with said communications system in order to authenticate a subscriber identity stored in said subscriber identity module; a recording unit for recording in said non-volatile memory, details of unauthenticated emergency calls made from the terminal in the absence of a subscriber identity module; and a data handling unit configured, following re-installation of a subscriber identity module into the user terminal and at or following authentication of a subscriber to said system, to retrieve any emergency call details from said non-volatile memory, and to provide these to said system.
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- 14. An apparatus for use in a communication system and configured in use to receive from a user terminal an unauthenticated emergency call request, to retrieve from that request a previously used and authenticated subscriber identity, and to store that identity.
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16. A method of handling unauthenticated emergency calls in a communication system that requires authentication of subscriber identities for non-emergency calls, the method comprising:
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upon authentication of a subscriber identity stored on a subscriber identity module installed in a user terminal, storing the subscriber identity in a non-volatile memory of the user terminal outside of said subscriber identity module; and following removal of the subscriber identity module from the user terminal, initiating an unauthenticated emergency call from the terminal, retrieving the used and authenticated subscriber identity from said non-volatile memory and providing this to the communications system during the initiation. - View Dependent Claims (17)
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18. The method according to claim, wherein said communication system is a GSM, EPS, or UMTS system, and said subscriber identity is an IMSI.
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19. A method of handling unauthenticated emergency calls in a communication system that requires authentication of subscriber identities for non-emergency calls, the method comprising:
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following removal of a subscriber identity module from a user terminal, storing within a non-volatile memory of the terminal, details of unauthenticated emergency calls made from the terminal in the absence of the subscriber identity module; and following re-installation of a subscriber identity module into the user terminal and at or following authentication of a subscriber to said system, retrieving any emergency call details from said non-volatile memory, and providing these to said system.
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Specification