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Method for signaling a device to perform no synchronization or include a synchronization delay on multimedia streams

A multimedia stream and multimedia technology, applied in synchronization devices, image communication, multiplexing communication, etc., can solve the problems of not providing synchronization jitter, sending equipment out of synchronization, etc., and achieve the effect of improving media quality and saving computing resources

Inactive Publication Date: 2008-10-15
NOKIA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finally, RFC 3388 does not provide a mechanism by which a device can indicate the desired synchronization jitter among different media
[0015] For the above reasons, there is currently no mechanism by which a sending device can indicate to a receiving device in a multimedia call that the multimedia stream transmitted by the sending device is not synchronized, nor is there a mechanism for specifying a synchronization delay or jitter for a multimedia stream

Method used

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  • Method for signaling a device to perform no synchronization or include a synchronization delay on multimedia streams
  • Method for signaling a device to perform no synchronization or include a synchronization delay on multimedia streams
  • Method for signaling a device to perform no synchronization or include a synchronization delay on multimedia streams

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Embodiment Construction

[0025] The present invention provides a mechanism where a transmitting or sending device can explicitly indicate which of the transmitted multimedia streams should not be synchronized or should include a specified amount of synchronization jitter. This mechanism helps the receiving device to understand the characteristics of the stream and allows the receiving device to make an informed decision on whether synchronization should be performed and whether to specify a synchronization jitter value.

[0026] In order to understand the implementation of the present invention, figure 1 Can be used based on the sending device notifying the receiving device during the session setup phase that it wants the receiving device to not perform any synchronization or to perform a synchronization with a coarse sync delay or jitter using a specific value (eg 500 ms). In this case, when decoding has been completed and each packet of each media stream has reached playout time, the receiving devic...

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Abstract

An improved system and method for permitting a transmitting electronic device to indicate explicitly which streams in a multimedia stream being transmitted should not be synchronized or should include a specified amount of synchronization jitter. The present invention aids the receiving device in understanding the stream characteristics. The present invention also allows the receiving device to make an informed decision as to whether an synchronization jitter value should be used when synchronizing two or more streams. For certain applications such as uni-directional video sharing or video PoC, the sending device of the stream can indicate that the receiving device doesn't perform any or limited synchronization for better media quality.

Description

technical field [0001] The present invention generally relates to the field of IP multimedia communications. More particularly, the present invention relates to signaling mechanisms for multimedia communications to instruct receiving devices not to perform synchronization or to include synchronization jitter between different multimedia streams. Background technique [0002] During the establishment of an IP multimedia call, the sending device of the call (ie, the provider or originator) specifies session information. Session information includes media and transport-related information. Session information is carried in protocol messages such as the Session Description Protocol (SDP). SDP is carried over high-level signaling protocols such as Session Initiation Protocol (SIP) and Real Time Streaming Protocol (RTSP). The Third Generation Partnership Project (3GPP) specifies SIP as the signaling protocol of choice for multimedia session establishment for the IP Multimedia S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04J3/06H04L29/06H04L65/1101H04L65/65H04L65/80H04N21/236H04N21/242
CPCH04N21/435H04N21/643H04N21/4307H04N21/41407H04N21/235H04L65/608H04L65/80H04L29/06027H04N21/4345H04N21/43072H04L65/65H04L7/00H04J3/06H04N21/43H04L2012/5603H04L65/1101
Inventor I·D·D·屈尔西奥U·钱德拉D·莱昂
Owner NOKIA CORP
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