Method and terminal for tile selection amongst a set of tiles

1. A method for selecting, at a terminal, a tile amongst a set of tiles associated with a multimedia content requested by the terminal, said multimedia content being divided into a plurality of tile segments, said method comprising:

obtaining a next position of a viewport of the terminal at an expiration of a current tile segment based on an estimation of a trajectory of the viewport;

identifying one or several tiles amongst the set of tiles, consecutive ones of the one or several tiles overlap one another and each of the one or several tiles comprising at least the viewport at the next position;

for each identified tile, determining at least one processing parameter depending on at least a center of the identified tile and said next position of the viewport; and

selecting an identified tile for which the determined at least one processing parameter meets a selection criterion.

2. The method according to claim 1 , wherein:

the processing parameter is a scalar product of a distance vector with a movement vector;

the selection criterion is met when the scalar product of an identified tile is higher than the scalar products of the other identified tiles.

3. The method according to claim 2 , wherein:

the distance vector is defined between said next position of the viewport and a center of an identified tile;

the movement vector is defined from the current position of the viewport and the next position of the viewport.

4. The method according to claim 1 , wherein:

the processing parameter is a distance between said next position of the viewport and a center of an identified tile

the selection criterion is met when the distance of an identified tile is smaller than the distance of the other identified tiles.

5. The method according to claim 1 , wherein the identified tiles comprise at least the viewport.

6. The method according to claim 1 , wherein each identified tile presents an overlap with a tile associated with the current tile segment.

7. The method according to claim 1 , wherein the estimation of the trajectory of the viewport is obtained by linear approximation.

8. The method according to claim 1 , wherein the next position of the viewport is obtained by extrapolation from the estimated trajectory.

9. A terminal configured to select a tile amongst a set of tiles associated with a multimedia content requested by the terminal, said multimedia content being divided into a plurality of tile segments,

wherein said terminal comprises one memory and one processing circuitry configured to perform:

obtaining a next position of a viewport of the terminal at an expiration of a current tile segment based on an estimation of a trajectory of the viewport;

identifying one or several tiles amongst the set of tiles, consecutive ones of the one or several tiles overlap one another and each of the one or several tiles comprising at least the viewport at the next position;

for each identified tile, determining at least one processing parameter depending on at least a center of the identified tile and said next position of the viewport;

selecting an identified tile for which the determined at least one processing parameter meets a selection criterion.

10. The terminal according to claim 9 , wherein:

the processing parameter is a scalar product of a distance vector with a movement vector;

the selection criterion is met when the scalar product of an identified tile is higher than the scalar products of the other identified tiles.

11. The terminal according to claim 10 , wherein:

the distance vector is defined between said next position of the viewport and a center of an identified tile;

the movement vector is defined from the current position of the viewport and the next position of the viewport.

12. The terminal according to claim 9 , wherein:

the processing parameter is a distance between said next position of the viewport and a center of an identified tile;

the selection criterion is met when the distance of an identified tile is smaller than the distance of the other identified tiles.

13. The terminal according to claim 9 , wherein the identified tiles comprise at least the viewport.

14. The terminal according to claim 9 , wherein each identified tile presents an overlap with a tile associated with the current tile segment.

15. A computer program product which is stored on a non-transitory computer readable medium and comprises program code instructions executable by a processor for implementing a method for selecting, at a terminal, a tile amongst a set of tiles associated with a multimedia content requested by the terminal, said multimedia content being divided into a plurality of tile segments, which comprises:

obtaining a next position of a viewport of the terminal at an expiration of a current tile segment based on an estimation of a trajectory of the viewport;

identifying one or several tiles amongst the set of tiles, consecutive ones of the one or several tiles overlap one another and each of the one or several tiles comprising at least the viewport at the next position;

for each identified tile, determining at least one processing parameter depending on at least a center of the identified tile and said next position of the viewport;

selecting an identified tile for which the determined at least one processing parameter meets a selection criterion.