Patent ID: 9055397
Filing Date: 2015-06-09
Classification: H04W

Abstract:
1. A method for providing a roaming functionality related to an Internet Protocol Multimedia Subsystem (IMS) session, wherein a first User Equipment (UE) is associated to a Home Public Land Mobile Network (HPLMN) and wherein the first UE roams in a Visited Public Land Mobile Network (VPLMN), wherein the Home Public Land Mobile Network (HPLMN) comprises a first IMS domain, wherein the VPLMN comprises a second IMS domain, and wherein the VPLMN comprises a Roaming Border Control Function (RBCF), wherein a session set-up of an IMS session requires the handling of control signaling and the establishment of a user plane path, wherein a session set-up request originates from the roaming first UE towards a second UE, the second UE being attached to a target network, the method comprising the steps of: transmitting, by the second IMS domain, a session set-up request control signaling to the first IMS domain; transmitting, by the first IMS domain, the session set-up request control signaling in a forward direction to the RBCF of the VPLMN; and handling, by the second IMS domain, the user plane path and the associated control signaling to terminate the session set-up; wherein local break out of media is applied for the roaming first UE; and wherein the RBCF of the VPLMN provides a linking of signaling received via a loop through the first IMS domain in the HPLMN with media anchored due to the local break out in the second IMS domain in the VPLMN.