METHOD AND APPARATUS FOR IMPROVING SERVICE EFFICIENCY IN WIRELESS COMMUNICATION SYSTEM

• US 20150358477A1
• Filed: 07/30/2014
• Published: 12/10/2015
• Est. Priority Date: 07/30/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JEONG, Sangsoo, CHO, Songyean, KIM, Hyejeong
• Granted Patent: US 10,142,490 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04M 15/56 for VoIP communications
• CPC Class Codes: H04M 15/57 for integrated multimedia messaging subsystem [IMS]
• CPC Class Codes: H04M 15/66 Policy and charging system
• CPC Class Codes: H04M 15/8016 based on quality of service [QoS]
• CPC Class Codes: H04W 4/16 Communication-related supplementary services, e.g. call-transfer or call-hold
• CPC Class Codes: H04W 4/24 Accounting or billing
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 48/04 based on user or terminal location or mobility data, e.g. moving direction, speed
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service

Abstract

Disclosed are a method and an apparatus for selecting a domain for a voice call in a mobile communication network. A terminal, which uses VoLTE, receives, from a network, identification information indicating whether IMS Voice over PS (IMS VoPS) is supported, determines whether the network supports IMS VoPS and determines a domain (PS or CS) to which a voice service will be provided through the network according to the determination result.

Claims

1-16. -16. (canceled)

17. A method for providing a voice over IP multimedia subsystem (IMS VoPS) by a terminal in a mobile communication system, the method comprising:

initiating a call based on the IMS VoPS;

receiving network feature support information indicating whether the network supports the IMS VoPS from a network;

identifying whether a bearer associated with the call is released; and

after the bearer associated with the call is released, attempting to select a GSM edge radio access network (GERAN) or a UMTS terrestrial radio access network (UTRAN) based on the network feature support information and a network update result received from the network.

18. The method of claim 17, wherein the receiving of the network feature support information comprises:

transmitting a first message if entering a tracking area that is not registered;

receiving a second message including the network feature support information; and

identifying whether the network feature support information indicates that the IMS VoPS is not supported by the network.

19. The method of claim 18,

wherein the first message comprises a tracking area update request message, and

wherein the second message comprises a tracking area update accept message.

20. The method of claim 17, wherein the attempting to select the GERAN or the UTRAN is performed if the network feature support information indicates that the IMS VoPS is not supported by the network and a value of the network update result indicates that a circuit switched fall back is not supported by the network.

21. The method of claim 17, further comprising:

transmitting a combined tracking area update request message;

receiving a tracking area update accept message including a value of the network update result; and

identifying whether the terminal is registered for evolved packet system services only based on the value of the network update result.

22. The method of claim 17, further comprising:

disabling a function associated with an evolved UMTS terrestrial radio access network (E-UTRAN).

23. The method of claim 17, further comprising identifying whether the bearer associated with the call is established.

24. The method of claim 23, wherein the bearer associated with the call is identified to be established if a quality of service class identifier indicates 1.

25. The method of claim 23, further comprising:

maintaining, until the established bearer associated with the call is released, a context of the bearer associated with the call even though the network feature support information indicates that the IMS VoPS is not supported by the network.

26. A terminal for providing a voice over IP multimedia subsystem (IMS VoPS) in a mobile communication system, the terminal comprising:

a transceiver configured to transmit and receive signals; and

a controller configured to;

initiate a call based on the IMS VoPS,

receive network feature support information indicating whether the network supports the IMS VoPS from a network,

identify whether a bearer associated with the call is released, and

attempt, after the bearer associated with the call is released, to select a GSM edge radio access network (GERAN) or a UMTS terrestrial radio access network (UTRAN) based on the network feature support information and a network update result received from the network.

27. The terminal of claim 26, wherein the controller is further configured to:

transmit a first message if entering a tracking area that is not registered;

receive a second message including the network feature support information; and

identify whether the network feature support information indicates that the IMS VoPS is not supported by the network.

28. The terminal of claim 27,

wherein the first message comprises a tracking area update request message, and

wherein the second message comprises a tracking area update accept message.

29. The terminal of claim 26, wherein the controller is further configured to attempt to select the GERAN or the UTRAN if the network feature support information indicates that the IMS VoPS is not supported by the network and a value of the network update result indicates that a circuit switched fall back is not supported by the network.

30. The terminal of claim 26, wherein the controller is further configured to:

transmit a combined tracking area update request message;

receive a tracking area update accept message including a value of the network update result; and

identify whether the terminal is registered for evolved packet system services only based on the value of the network update result.

31. The terminal of claim 26, wherein the controller is further configured to:

disable a function associated with an evolved UMTS terrestrial radio access network (E-UTRAN).

32. The terminal of claim 26, wherein the controller is further configured to:

identify whether the bearer associated with the call is established.

33. The terminal of claim 32, wherein the bearer associated with the call is identified to be established if a quality of service class identifier indicates 1.

34. The terminal of claim 32, wherein the controller is further configured to maintain, until the established bearer associated with the call is released, a context of the bearer associated with the call even though the network feature support information indicates that the IMS VoPS is not supported by the network.