Internet protocol (IP) multimedia subsystem (IMS) availability detection

• US 7,031,706 B2
• Filed: 07/23/2002
• Issued: 04/18/2006
• Est. Priority Date: 08/21/2001
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Latvakoski, Juhani, Karjalainen, Ilpo, Polet, Jyrki, Pyörälä, Reijo, Tuohimetsä, Sakari, Niskanen, Jussi
• Primary Examiner(s): Trinh, Sonny
• Assistant Examiner(s): PHAN, HUY Q
• Application Number:
  US10/202,563
• Publication Number:
  US 20030045290A1
• Time in Patent Office: 1,365 Days
• Field of Search: 455/432.3, 455/432.1, 455/433, 455/435.1, 455/435.2, 455/418, 455/419, 455/422.1, 370/328, 370/338, 370/352, 370/354
• US Class Current: 455/432.3
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 67/303 Terminal profiles
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

A method is disclosed for providing information related to an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS) to a mobile terminal. The method includes storing the information into a memory that is readable by the mobile terminal, and reading the stored information from the memory. The memory may be at least one of a USIM, an EEPROM or a RAM. In one embodiment the information is stored during a PDP context activation procedure. A wireless communications system that operates in accordance with the method is also disclosed.

Claims

1. A method, comprising:

providing information related to an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS) to a mobile terminal;

storing the information into a memory that is readable by the mobile terminal, and

reading the stored information from the memory,

where an Activate PDP Context Request message is sent from the mobile terminal to a Serving GPRS Support Node (SGSN) and comprises a special identifier that signals an IMS query by the mobile terminal; and

when activating a PDP context, the SGSN includes a parameter P in place of a PDP address in an Activate PDP Context Accept message when responding to the Activate PDP Context Request message, where the value of P indicates the availability or the nonavailability of IMS to the mobile terminal.

2. A method, comprising:

providing information related to an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS) to a mobile terminal;

storing the information into a memory that is readable by the mobile terminal, and

reading the stored information from the memory,

where the information is descriptive of a Proxy Call State Control Function (pCSFS) address through which the IMS is available, and

where the value of the pCSCF is sent to the mobile terminal in a GPRS attach procedure before a PDP Context Activation procedure.

3. A wireless communications system, comprising means for providing information from a wireless network to a mobile terminal, said information being related to availability of an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS), further comprising memory means, readable by said mobile terminal, for storing said information,

where an Activate PDP Context Request message is sent from said mobile terminal to a Serving GPRS Support Node (SGSN) and comprises a special identifier that signals an IMS query by said mobile terminal;

and

when activating a PDP context, said SGSN includes a parameter P in place of a PDP address in an Activate PDP Context Accept message when responding to said Activate PDP Context Request message, where said value of P indicates said availability or said nonavailability of IMS to said mobile terminal.

4. A wireless communications system, comprising means for providing information from a wireless network to a mobile terminal, said information being related to availability of an Internet Protocol (IP) Multi-Media (IM) Subsystem (IMS), further comprising memory means, readable by said mobile terminal, for storing said information, where said information is descriptive of a Proxy Call State Control Function (pCSFS) address through which said IMS is available, and where said value of said pCSCF is sent to said mobile terminal in a GPRS attach procedure before a PDP Context Activation procedure.