Method and controller for audio and/or video content delivery

A controller intended for being used in an audio and/or video content delivery system deployed on top of a network infrastructure, the audio and/or video content delivery system further comprising a plurality of caching platforms for delivering an audio and/or video content via the network infrastructure, the audio and/or video content being segmented into data segments available in various representations with respective audio and/or video qualities, the representations being time-aligned per segments further divided into chunks having same chunk duration with respect to the audio and/or video content, wherein the controller comprises electronic circuitry configured for, for each caching platform:

• obtaining a physical round-trip time information pertaining to the caching platform in question with respect to delivering audio and/or video contents by the caching platform in question to terminals via the network infrastructure;
• computing a minimum burst transfer size mTBS from the maximum average bitrate of the various representations of the audio and/or video content and from the obtained physical round-trip time information;
• computing a minimum burst transfer duration mTBDi, for one or more representations i of the audio and/or video content, from the minimum burst transfer size mTBS;
• and, the electronic circuitry is further configured, when the audio and/or video content has to be delivered to the terminal, for:
• selecting, from a set L0 of candidate caching platforms, the caching platform to be used to deliver the audio and/or video content to the terminal, as a function of the minimum burst transfer duration mTBDi computed for one or more representations i of the audio and/or video content;
• and
• redirecting the terminal to the selected platform for further delivery of the audio and/or video content in the form of bursts of chunks;
• and wherein the electronic circuitry is further configured, so as to select the caching platform to be used, for:
• forming a list L1, from the set L0 of candidate caching platforms, containing the caching platforms that exhibit a minimum burst transfer duration mTBDi for one or more representations i of the audio and/or video content which is lower or equal to the chunk duration applicable to the delivery of the audio and/or video content in question, and when the cardinality of the list L1 is above a predefined threshold, selecting the caching platform to be used from the list L1;
• and otherwise forming a list L2, from the set L0 of candidate caching platforms, containing the caching platforms that exhibit a minimum burst transfer duration mTBDi lower or equal to a predefined threshold TH that is a multiple of the chunk duration applicable to the delivery of the audio and/or video content in question, and selecting the caching platform to be used from the list L2.