Audiovisual session switchover from a first access network to a second access network

摘要

A method of switching over an audiovisual session involves receiving a request for session switchover to a second access network, emitted following a change of a state of attachment of the terminal; ordering switchover of the audiovisual session from a first output interface to a second output interface at a data stream gateway; recovering information related to a context of the audiovisual session switched over to the second interface; ordering evaluation at a contents profiles server of an adaptation of quality, that can be supported by the second interface; and requesting an update of the data stream to ensure the quality adaptation.

主权项

1. A method of switching over an audiovisual session in a telecommunications network comprising at least one first access network and one second access network, an audiovisual session being in progress, during which at least one user terminal attached to said first access network and able to attach itself to said second access network receives from a contents server at least one data stream constituent of an audiovisual content by way of a data stream gateway comprising a first interface to said first access network and a second output interface to said second access network, wherein said audiovisual content is encoded in the form of a plurality of scaled data streams comprising a basic stream and at least one enhancement stream, said method, when said terminal has attached itself to said second access network, comprising the steps:
receiving a request for session switchover to the second access network, said switchover request having been emitted following a change of a state of attachment of said terminal to said second network; ordering switchover of said audiovisual session at said data stream gateway from the first output interface to the second output interface; recovering information related to a context of said audiovisual session switched over to the second interface; ordering evaluation at a contents profile server of an adaptation of the audiovisual content quality, that can be supported by said second interface, of the audiovisual content transmitted for said audiovisual session as a function of said recovered information related to the context of said audiovisual session switched over to the second interface; receiving from said contents profile server a response comprising characteristics of an adaptation of the audiovisual content quality that can be supported by said second interface, said response of said contents profile server indicating a number of enhancement streams to be activated; saving context information relating to connections established between said user terminal and said data stream gateway in respect of said audiovisual session for a predetermined duration; and requesting to the contents server an update of said data stream emitted during said audiovisual session on the basis of the received characteristics of an adaptation of the audiovisual content quality that can be supported by said second interface, so as to ensure said evaluated adaptation of quality.