Method for operating a mobile device

1. A method for operating a mobile device, wherein the mobile device is configured to download a media stream comprising a plurality of data segments and to playback the media stream during download, wherein the media stream is downloaded as a plurality of blocks of data segments, each block of data segments comprising a set of the plurality of data segments representing a corresponding media stream portion of the media stream, wherein the method comprises:

determining a required playback time for a next block of data segments to be downloaded depending on a predetermined required minimum playback time defining a required minimum time duration for playing back the media stream portion provided by the next block of data segments;

determining a recent playback time of a block of data segments which has been downloaded recently;

determining the required playback time for the next block of data segments to be downloaded depending on the recent playback time;

requesting by the mobile device a download of the plurality of blocks of data segments having the required playback time, wherein a gap between a download of the next block of data segments and a download of the block after the next block spans a time period that enables a radio frequency (RF) receiver unit of the mobile device to be powered down during the gap;

downloading to the mobile device the plurality of blocks of data segments having the required playback time; and

powering down the RF receiver unit of the mobile device during the gap between the download of the next block of data segments and the download of the block after the next block of data segments.

2. The method according to claim 1 , further comprising:

determining the required minimum playback time based on an inactivity timer value configured for an RF receiver unit of the mobile device performing the download of the media stream, wherein the inactivity timer value controls a transition of the RF receiver unit between a first mode and a second mode, wherein a power consumption of the RF receiver unit in the first mode is higher than in the second mode.

3. The method according to claim 2 , wherein the inactivity timer value controls a radio resource control inactivity timer of the RF receiver unit and is configured by a network control layer of a communication network in which the mobile device is operated.

4. The method according to claim 1 , further comprising:

requesting a download of a block of data segments having the determined required playback time.

5. The method according to claim 1 , further comprising:

determining a recent download time required for downloading a block of data segments which has been downloaded recently, and

determining the required playback time for the next block of data segments to be downloaded depending on the recent download time.

6. The method according to claim 1 , wherein determining the required playback time for the next block of data segments to be downloaded comprises:

determining a ratio of the recent playback time to the recent download time, and

setting selectively, based on the determined ratio, the required playback time for the next block of data segments to be downloaded to either the predetermined required minimum playback time or to a maximum of the predetermined required minimum playback time and a time derived from a reduction of the recent playback time.

7. The method according to claim 6 , wherein at least some of the data segments of the media stream are each available in a plurality of different coding formats, wherein the different coding formats cause different amounts of data to be transferred for downloading the data segment, wherein the method further comprises

selecting, for the next block of data segments to be downloaded, a coding format of the available plurality of different coding formats depending on the recent playback time and the recent download time.

8. A mobile device, comprising:

a radio frequency (RF) receiver unit for downloading a plurality of data segments of a media stream,

an output device for playing back the media of the downloaded media stream to a user, and

a processing device configured to download the media stream and to playback the media stream during download, wherein the media stream is downloaded as a plurality of blocks of data segments, each block of data segments comprising a set of the plurality of data segments representing a corresponding media stream portion of the media stream, and

to determine a required playback time for a next block of data segments to be downloaded depending on a predetermined required minimum playback time defining a required minimum time duration for playing back the media stream portion provided by the next block of data segments;

to determine a recent playback time of a block of data segments which has been downloaded recently;

to determine the required playback time for the next block of data segments to be downloaded depending on the recent playback time;

requesting a download of the plurality of blocks of data segments having the required playback time, wherein a gap between a download of the next block of data segments and a download of the block after the next block spans a time period that enables the RF receiver unit of the mobile device to be powered down during the gap;

download to the mobile device the plurality of blocks of data segments having the required playback time; and

power down the RF receiver unit during the gap between the download of the next block of data segments and the download of the block after the next block of data segments.

9. The mobile device according to claim 8 , wherein the mobile device is configured to determine a required playback time for a next block of data segments to be downloaded depending on a predetermined required minimum playback time defining a required minimum time duration for playing back the media stream portion provided by the next block of data segments.

10. The mobile device according to claim 8 , wherein the mobile device comprises at least one device of a group consisting of a mobile telephone, a mobile media player, a mobile computer, and a tablet computer.