Patent ID: 7876789

Claim:
A method for synchronizing the presentation of a first and a second media stream at a receiving terminal in a mobile communication system, the method comprising: transmitting the first media stream from a sending terminal; presenting the first media stream at the sending terminal delayed from the transmission of the first media stream with a time dependent on an time difference between a first and a second end-to-end time delay; wherein the first media stream and the second media stream are transmitted separately but at least partly simultaneously from the sending terminal to the receiving terminal; wherein the first media stream is built up from data packets, which data packets are transmitted consecutively from the sending terminal to the receiving terminal and presented consecutively at the receiving terminal, wherein the first media stream is associated with the first end-to-end time delay and the second media stream is associated with the second end-to-end time delay; wherein the first end-to-end time delay is larger than the second end-to-end time delay, wherein the end-to-end time delays are defined as the time from transmitting a part of a media stream from the sending terminal until that part of the media stream is presented at the receiving terminal; wherein the first media stream is presented at the sending terminal delayed with a default value that is selected to be a typical value of the time difference between the first and the second end-to-end time delay, and wherein the default value is used to delay only a first number of data packets of the first media stream, and wherein the following number of data packets of the first media stream are presented delayed with a value dependent on an estimation of the difference between the first and the second end-to-end time delay.