| 摘要 |
For some mobile communication services, a media stream such as video, will be combined with another media stream such as voice. For example, a user of a first terminal (101) is involved in a voice call over e.g. a circuit switched network (103) with a friend. During the voice call, the user of the first terminal decides to start transmitting another media stream, such as live streamed video, which may be transmitted over a packet switched network (104), to the friend's terminal (102). In such a case there is problem in that the two media streams voice and video may have quite different end-to-end time delays, i.e. the time from a part of the media stream is transmitted from the first user's terminal (101) until that part of the media stream is presented at the friend's terminal (102). Since comments from the first user will be presented to the user's friend earlier than the commented part of the video this will be quite annoying to the friend. To avoid this problem this invention presents the video to the user of the first terminal (101) delayed with a time dependent on the time difference between the end-to-end time delay of video and the end-to-end time delay of voice. Thereby, comments from the user of the first terminal (101) regarding the video will be received at the friend's terminal (102) approximately synchronized with the video.
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