Nokia Corporation

Nokia Technologies Oy

Gábor Bajko

Tao Haukka

Valtteri Niemi

Aki Niemi

György Wolfner

József Varga

Zsolt Rajko

Gábor Jaro

An apparatus and method for selecting a security association timer between user equipment and a control entity in a communication system are disclosed. The apparatus includes a transmitter configured to transmit a registration request message to a control entity in a communication system, whereby the registration request message is configured to request registration with the control entity. The apparatus further includes a receiver configured to receive an authentication challenge including a temporary timer, whereby the temporary timer is configured to set a time duration for the apparatus to respond to the authentication challenge. The receiver is further configured to receive an acknowledgement message including a security association timeout value in response to the transmitted registration message, whereby the security association timeout value includes a set time length of a security association equal to a registration time length set for registration of the apparatus. The transmitter is further configured to transmit a registration authentication message to the control entity before expiration of the temporary timer.

Method and communication system for controlling security association lifetime

A method of communication between a calling party in a first network and a called party in a second network is disclosed. The method comprises determining in the first network an address associated with the called party. The method also comprises determining, based on the address, if the called party is in a trusted network, and controlling the communication between the called party and the calling party in dependence on if the called party is in a trusted network.

Method of communication

A method in a communication system wherein a user () is arranged to register with a control entity () comprises sending a message from the communication system to the user () requesting that the user re-register with said communication network. The user is caused to re-register with said network in response to said message.

Subscriber registrations in a mobile communication system

A method for selecting a time length of a security association (SA) between user equipment (UE) which transmits and receives communications and a control entity in a communication system in accordance with the invention, includes transmitting a registration message (SM) from the user equipment to the control entity (P-CSCF) requesting registration of the user equipment with the control entity; after transmission of the registration message, setting the time length of the security association between the user equipment and the control entity to be equal to a registration time length set between the user equipment and the control entity during which registration of the user equipment with the control entity is valid; and transmitting the set time length of the security association to the user equipment as part of an acknowledgment message (SMor SM) to the registration message to cause the security association to have a time equal to the registration timer length.

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Budapest, Hungary

Gábor Bajko