Communication apparatus, terminal, and communication method

• US 10,701,543 B2
• Filed: 05/01/2019
• Issued: 06/30/2020
• Est. Priority Date: 06/26/2015
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Suzuki, Naoaki, Tamura, Toshiyuki
• Primary Examiner(s): Taylor, Nathan S
• Application Number:
  US16/400,714
• Publication Number:
  US 20190327598A1
• Time in Patent Office: 426 Days
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1033 Signalling gateways
• CPC Class Codes: H04L 65/104 in the network
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1073 Registration or de-registration
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14
• CPC Class Codes: H04W 88/14 Backbone network devices

Abstract

A communication apparatus includes a location information acquisition unit that acquires location information of a terminal, a reception unit that receives a call request transmitted by the terminal, a service identification unit that identifies a service of the request based on the location information of the terminal and a destination telephone number of the request, and a transmission unit that transmits a response to the terminal, when the service corresponding to the request cannot be provided.

Claims

1. A communication apparatus in a home network, the communication apparatus comprising:

a receiver configured to receive a session establishment request from a User Equipment (UE) being registered in an IMS (IP (Internet Protocol) Multimedia Subsystem) in the home network;

a controller configured to identify a visited network where the UE is located;

a transceiver configured to access a database to obtain information related to emergency numbers for the visited network, the information being used for detection of non-UE detectable emergency calls; and

a transmitter configured to send a session rejection to the UE, the session rejection indicating the session establishment request is rejected by the communication apparatus based on detecting non-UE detectable emergency calls in the session establishment request using the information.

2. The communication apparatus of claim 1, wherein the session rejection further includes a contact header field with an emergency service uniform resource name (URN).

3. The communication apparatus of claim 1, wherein the session rejection is a response using a response code 380.

4. The communication apparatus of claim 1, wherein the communication apparatus is a proxy call session control function (P-CSCF) in the home network.

5. A User Equipment (UE) comprising:

a transmitter configured to send a session establishment request to a communication apparatus in a home network, the UE being registered in an IMS (IP (Internet Protocol) Multimedia Subsystem) in the home network and located in a visited network;

a receiver configured to receive a session rejection from the communication apparatus, the session rejection indicating the session establishment request is rejected by the communication apparatus; and

a controller configured to select a domain for an emergency session based on information related to whether a domain is available to the UE.

6. The UE of claim 5, wherein the session rejection further includes a contact header field with an emergency service uniform resource name (URN).

7. The UE of claim 5, wherein the session rejection is a response using a response code 380.

8. The UE of claim 5, wherein the communication apparatus is a proxy call session control function (P-CSCF) in the home network.

9. The UE of claim 5, wherein the controller selects the domain amongst at least a packet switched (PS) domain or a circuit switched (CS) domain.

10. The UE of claim 5, wherein

the transmitter sends a session initiation protocol (SIP) register message to the communication apparatus in order to register the UE in the IMS, and

the transmitter sends the session establishment request to the communication apparatus after sending the SIP register message.

11. A communication method by a communication apparatus in a home network, the communication method comprising:

receiving a session establishment request from a User Equipment (UE) being registered in an IMS (IP (Internet Protocol) Multimedia Subsystem) in the home network;

identifying a visited network where the UE is located;

accessing a database to obtain information related to emergency numbers for the visited network, the information being used for detection of non-UE detectable emergency calls; and

sending a session rejection to the UE, the session rejection indicating the session establishment request is rejected by the communication apparatus based on detecting non-UE detectable emergency calls in the session establishment request using the information.

12. A communication method by a User Equipment (UE) the communication method comprising:

sending a session establishment request to a communication apparatus in a home network, the UE being registered in an IMS (IP (Internet Protocol) Multimedia Subsystem) in the home network and located in a visited network;

receiving a session rejection from the communication apparatus, the session rejection indicating the session establishment request is rejected by the communication apparatus; and

selecting a domain for an emergency session based on information related to whether a domain is available to the UE.