Internet protocol (IP) multimedia subsystem (IMS) availability detection
AssigneeNokia Corporation
InventorsSakari Tuohimetsä, Ilpo Karjalainen, Jyrki Polet, Juhani Latvakoski, Jussi Niskanen, Reijo Pyörälä
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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.
Claims4
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.
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.
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.
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.
Dependencies are inferred from the claim text.