METHOD AND APPARATUS FOR PROCESSING EMERGENCY CALLS
First Claim
1. A method, implemented by a wireless transmit/receive unit (WTRU), for processing an emergency call, the method comprising:
- receiving a system information (SI) broadcast including emergency services support information that conveys various emergency call network support levels and setup procedures; and
decoding the SI broadcast to retrieve system parameters used to process an emergency call.
1 Assignment
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Accused Products
Abstract
A method and apparatus are described for processing emergency calls by simplifying call setup procedures and minimizing call setup delay. In one scenario, a system information (SI) broadcast may include emergency services support information that conveys various emergency call network support levels and setup procedures. The SI broadcast is decoded to retrieve system parameters used to process an emergency call. The SI broadcast may include a bitmap or at least one information element (IE), that indicates the various emergency call network support levels. In another scenario, an extended service request message indicating circuit switched fallback (CSFB) for an emergency call is transmitted to a packet switched (PS) radio access technology (RAT) network during a PS session. An inter-system change is performed from the PS RAT network to a circuit switched (CS) RAT without a PS handover, and a CS emergency call is initiated via the CS RAT network.
183 Citations
20 Claims
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1. A method, implemented by a wireless transmit/receive unit (WTRU), for processing an emergency call, the method comprising:
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receiving a system information (SI) broadcast including emergency services support information that conveys various emergency call network support levels and setup procedures; and decoding the SI broadcast to retrieve system parameters used to process an emergency call. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, implemented by a wireless transmit/receive unit (WTRU), for processing an emergency call, the method comprising:
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transmitting, to a packet switched (PS) radio access technology (RAT) network, an extended service request message indicating circuit switched fallback (CSFB) for an emergency call during a PS session; performing an inter-system change from the PS RAT network to a circuit switched (CS) RAT network without PS handover; and initiating a CS emergency call via the CS RAT network. - View Dependent Claims (12)
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13. A wireless transmit/receive unit (WTRU) for processing an emergency call, the WTRU comprising:
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a receiver configured to receive a system information (SI) broadcast including emergency services support information that conveys various emergency call network support levels and setup procedures; and a processor configured to decode the SI broadcast to retrieve system parameters used to process an emergency call. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A wireless transmit/receive unit (WTRU) for processing an emergency call, the WTRU comprising:
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a transmitter configured to transmit, to a packet switched (PS) radio access technology (RAT) network, an extended service request message indicating circuit switched fallback (CSFB) for an emergency call during a PS session; and the processor configured to perform an inter-system change from the PS RAT network to a circuit switched (CS) RAT network without PS handover, and initiate CS emergency call via the CS RAT network.
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Specification