Nokia Corporation

Ru-Shang Wang

Emre Baris Aksu

Viktor Varsa

Igor Danilo Diego Curcio

David Leon

Keith D Miller

Igor D Curcio

Ragip Kurceren

Miikka Lundan

Igor Danilo Curcio

Igor DD Curcio

A method in a communication system, a communication system and a communication device wherein in the method media streams are transmitted from a sending communication device to a receiving communication device at least partly via a wireless communication network. At least one media stream is selected to be transmitted to the receiving communication device. QoS requirements for transmitting the selected at least one media stream are defined, transmission resources are reserved from the wireless communication network for the transmission of at least one media stream, and a setup procedure is performed between the receiving communication device and the sending communication device for activating the one packet data transmission connection.

Method in a communication system, a communication system and a communication device

The present invention relates to a method for transmitting video information, in which a bitstream is formed comprising a set of frames comprising macroblocks. At least one switching frame is formed into the bitstream, macroblocks of the switching frame are arranged into a first and a second group of macroblocks, each macroblock of the first group of macroblocks are encoded by a first encoding method to provide a switching point for continuing the transmission of video information with another bitstream formed from the video information; and macroblocks of the second group of macroblocks are encoded by another encoding method. Errors in transmission of video information are reduced by forming at least one SP-encoded frame by predictively encoding the macroblocks; replacing part of the SP-encoded macroblocks with intra encoded blocks; and transmitting the encoded frame containing both predictively and intra encoded macroblocks instead of the SP-encoded frame.

Transmission of video information

A method to provide to a sender of RTP packets the actual receiver buffer fullness level in a receiver of the RTP packets at a certain time instant represented as remaining playout duration in time. The receiver sends in an RTCP report the sequence number of a selected RTP packet in the receiver buffer and the time difference between the scheduled playout time of this packet and the current time. Based on this timing information, the sender calculates the amount of time it would take for the receiver buffer to empty if the receiver continues to playout at normal speed and no further RTP packets arrive to the receiver buffer. This receiver buffer fullness level information can be used at the sender to adjust the transmission rate and/or nominal playout rate of the RTP packets in order to maintain a targeted receiver buffer fullness level.

Method and device for controlling receiver buffer fullness level in multimedia streaming

A method for the client in a multimedia streaming network to control the receiver buffer fullness by way of effectively shifting the transmission clock in the server who provides streaming data to the client. In order to avoid buffer underflow or overflow, the client sends a message to the server requesting the shift of the transmission clock either forward or backward depending on whether the client wants to increase or decrease the receiver buffer. Based on the message, the server adjusts the data transmission amount by effectively shifting its transmission clock. The request from the client can be sent through RTCP or RTSP.

Rate adaptation method and device in multimedia streaming

The invention relates to a method for packet switched streaming of media, such as video and/or audio, from a streaming server () to a mobile client device () over an air-interface. The method comprises noticing a change in a downlink air-interface bandwidth, sending from the mobile client device () to the streaming server () a request for adapting streaming server transmission bit rate, receiving the request at the streaming server () and adapting the streaming server transmission bit rate in accordance with the request. According to the method, the request indicates to the streaming server () a current downlink air-interface bandwidth and that said adapting of the streaming server transmission bit rate is performed in accordance with said current downlink air-interface bandwidth.

Growing community of inventors

Coppell, TX, United States of America

Ru-Shang Wang