Amazon Technologies, Inc.

Livestreaming Sweden Ab

Net Insight Intellectual Property Ab

Anders Cedronius

Christer Bohm

Per Lindgren

Hans Insulander

Magnus Danielson

Magnus Danielsson

Ted Olsson

A method in a packet-based network like the Internet is provided, which is directed towards packet loss recovery for transmission of a data stream, DSin a packet-based network. The method comprises transmitting data packets associated with the data stream, and upon receiving a retransmission request of missing data, retransmitting the missing data applying a selective retransmission of missing data, which may be based on a priority ranking of data types to be retransmitted, performing retransmission if it is determined that missing data will be received in time for display, or performing retransmission with a rate control.

Retransmission of data in packet networks

Systems and methods for video distribution synchronization are described herein. An example method to distribute a media stream over a distribution network to a number of devices may include determining, by one or more computer processors coupled to memory, a common master-client shared time reference T. Example methods may include determining a mean intermediate arrival time for first packets of a first type of the media stream, determining respective first playout times for the first packets based on the mean intermediate arrival time and the time reference T, associating the first packets with the respective first playout times, and distributing the media stream to the plurality of devices.

Video distribution synchronization

There is provided a method in a distribution network (), comprising a central master nodefor distributing a received media stream DO comprising packets of a first type over the distribution network to a multiple of client devices. The method comprising providing a common master-client shared time reference T, and determining a mean intermediate arrival time for received packets of the first type, which is utilized for providing playout time information for the packets together with the time reference T.

There is provided a mechanism for providing Adaptive Bit Rate adjustments of media streams like video for live Over the Top distribution without the need to monitor buffer fill levels, which is advantageous for live video distribution over IP networks. An embodiment of the invention is based on monitoring change in the received bitrate level at a client device, and providing a predicted future bandwidth characteristics of the network based on the change. By monitoring the received bitrate and its rate of change over time, a prediction of (near future) available bandwidth in the network is advantageously provided. A drastic drop of the received bitrate may for instance indicate that the available bandwidth will become too low to sustain a currently received media stream, and the system can accordingly initiate a decision to request a lower video quality.

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Alvsjo, Sweden

Anders Cedronius