Method and apparatus for performing handover of an emergency call between wireless networks
First Claim
1. A method for wireless communication, comprising:
- communicating with a packet-switched wireless network by a user equipment (UE) for an emergency call;
receiving an indication to perform handover from the packet-switched wireless network to a circuit-switched wireless network;
sending a message from the UE, the message comprising an emergency indication to initiate handover to the circuit-switched wireless network, the emergency indication comprising a preconfigured called party number,wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to a Mobile Switching Center (MSC) of the circuit-switched wireless network in response to a query from the MSC;
communicating with the circuit-switched wireless network for the emergency call after handover;
obtaining location services via the packet-switched wireless network for the emergency call prior to handover; and
obtaining location services via the circuit-switched wireless network for the emergency call after handover.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques for supporting handover of an emergency call between wireless networks are described. A UE may communicate with a first wireless network (e.g., a 3GPP E-UTRAN) for an emergency call and may receive an indication to perform handover to a second wireless network (e.g., a CDMA2000 1xRTT network). In an aspect, the UE may send a message including an emergency indication (an emergency global number, or a reserved emergency number, or some other indication) to initiate handover to the second wireless network. A designated network entity may recognize the emergency call based on the emergency indication and may map the emergency indication to a local emergency number or an Emergency Session Transfer Number for SRVCC (E-STN-SR), which may be used to establish a new incoming call leg to a network server anchoring the emergency call. The UE may then communicate with the second wireless network via the network server for the emergency call after handover.
24 Citations
32 Claims
-
1. A method for wireless communication, comprising:
-
communicating with a packet-switched wireless network by a user equipment (UE) for an emergency call; receiving an indication to perform handover from the packet-switched wireless network to a circuit-switched wireless network; sending a message from the UE, the message comprising an emergency indication to initiate handover to the circuit-switched wireless network, the emergency indication comprising a preconfigured called party number, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to a Mobile Switching Center (MSC) of the circuit-switched wireless network in response to a query from the MSC; communicating with the circuit-switched wireless network for the emergency call after handover; obtaining location services via the packet-switched wireless network for the emergency call prior to handover; and obtaining location services via the circuit-switched wireless network for the emergency call after handover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An apparatus for wireless communication, comprising:
-
means for communicating with a packet-switched wireless network by a user equipment (UE) for an emergency call; means for receiving an indication to perform handover from the packet-switched wireless network to a circuit-switched wireless network; means for sending a message from the UE comprising an emergency indication to initiate handover to the circuit-switched wireless network, the emergency indication comprising a preconfigured called party number, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to a Mobile Switching Center (MSC) of the circuit-switched wireless network in response to a query from the MSC; means for communicating with the circuit-switched wireless network for the emergency call after handover; means for obtaining location services via the packet-switched wireless network for the emergency call prior to handover; and means for obtaining location services via the circuit-switched wireless network for the emergency call after handover. - View Dependent Claims (11, 12, 13)
-
-
14. An apparatus for wireless communication, comprising:
-
at least one processing unit configured to communicate with a packet-switched wireless network by a user equipment (UE) for an emergency call, to receive an indication to perform handover from the packet-switched wireless network to a circuit-switched wireless network, to send a message comprising an emergency indication to initiate handover of the emergency call to the circuit-switched wireless network, the emergency indication comprising a preconfigured called party number, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to a Mobile Switching Center (MSC) of the circuit-switched wireless network in response to a query from the MSC, to communicate with the circuit-switched wireless network for the emergency call after handover, to obtain location services via the packet-switched wireless network for the emergency call prior to handover, and to obtain location services via the circuit-switched wireless network for the emergency call after handover. - View Dependent Claims (15, 16)
-
-
17. A computer program product, comprising:
-
a non-transitory computer-readable medium comprising; code to cause at least one computer to communicate with a packet-switched wireless network by a user equipment (UE) for an emergency call; code to cause the at least one computer to receive an indication to perform handover from the packet-switched wireless network to a circuit-switched wireless network; code to cause the at least one computer to send a message comprising an emergency indication to initiate handover to the circuit-switched wireless network, the emergency indication comprising a preconfigured called party number, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to a Mobile Switching Center (MSC) of the circuit-switched wireless network in response to a query from the MSC; code to cause the at least one computer to communicate with the circuit-switched wireless network for the emergency call after handover; code to cause the at least one computer to obtain location services via the packet-switched wireless network for the emergency call prior to handover; and code to cause the at least one computer to obtain location services via the circuit-switched wireless network for the emergency call after handover.
-
-
18. A method of supporting wireless communication, comprising:
-
receiving at a network entity a first message sent by a user equipment (UE) to initiate handover of an emergency call from a packet-switched wireless network to a circuit-switched wireless network; recognizing the emergency call based on an emergency indication included in the first message; determining a designated number for the emergency call from a location server; replacing the emergency indication in the first message with the designated number for the emergency call to obtain a second message; sending the second message from the network entity to a Mobile Switching Center (MSC) of the circuit-switched wireless network for call origination for handover of the emergency call, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to the MSC in response to a query from the MSC; and sending an identity of a target serving node in the circuit-switched wireless network to the location server to support location services for the UE in the circuit-switched wireless network after handover and during at least the emergency call to maintain location continuity. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
-
25. An apparatus for wireless communication, comprising:
-
means for receiving at a network entity a first message sent by a user equipment (UE) to initiate handover of an emergency call from a packet-switched wireless network to a circuit-switched wireless network; means for recognizing the emergency call based on an emergency indication included in the first message; means for determining a designated number for the emergency call from a location server; means for replacing the emergency indication in the first message with the designated number for the emergency call to obtain a second message; means for sending the second message from the network entity to a Mobile Switching Center (MSC) of the circuit-switched wireless network for call origination for handover of the emergency call, wherein an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for the emergency call of the UE is sent by a Mobile Positioning Center (MPC) to the MSC in response to a query from the MSC; and means for sending an identity of a target serving node in the circuit-switched wireless network to the location server to support location services for the UE in the circuit-switched wireless network after handover and during at least the emergency call to maintain location continuity. - View Dependent Claims (26, 27)
-
-
28. A method of supporting wireless communication, comprising:
-
determining an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for an emergency call for a user equipment (UE) at a network entity; receiving a query for the UE at the network entity, the query being sent by a Mobile Switching Center (MSC) of a circuit-switched wireless network in response to handover of the emergency call from a packet-switched-wireless network to the circuit-switched wireless network; sending, by a Mobile Positioning Center (MPC), the E-STN-SR for the emergency call for the UE from the network entity to the MSC in response to the query, the E-STN-SR being used to route the emergency call to a network server anchoring the emergency call; and sending an identity of a target serving node in the circuit-switched wireless network to the location server to support location services for the UE in the circuit-switched wireless network after handover and during at least the emergency call to maintain location continuity. - View Dependent Claims (29, 30)
-
-
31. An apparatus for supporting wireless communication, comprising:
-
means for determining an Emergency Session Transfer Number for single radio voice call continuity (SRVCC) (E-STN-SR) for an emergency call for a user equipment (UE) at a network entity; means for receiving a query for the UE at the network entity, the query being sent by a Mobile Switching Center (MSC) of a circuit-switched wireless network in response to handover of the emergency call from a packet-switched wireless network to the circuit-switched wireless network; sending, by a Mobile Positioning Center (MPC), the E-STN-SR for the emergency call for the UE from the network entity to the MSC in response to the query, the E-STN-SR being used to route the emergency call to a network server anchoring the emergency call; and means for sending an identity of a target serving node in the circuit-switched wireless network to the location server to support location services for the UE in the circuit-switched wireless network after handover and during at least the emergency call to maintain location continuity. - View Dependent Claims (32)
-
Specification