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Method for managing variations in a data flow rate

A technology of flow rate and data, which is applied in the field of flow control and can solve problems such as data loss

Inactive Publication Date: 2006-08-23
CISCO SYST INT R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The result of this is data loss that appears to users of H.320 endpoints as image artifacts

Method used

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  • Method for managing variations in a data flow rate

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Embodiment Construction

[0021] Hereinafter, the present invention will be discussed by describing preferred embodiments and by referring to the accompanying drawings. However, those skilled in the art will recognize other applications and modifications within the scope of the invention as defined in the appended independent claims.

[0022] The present invention provides automatic detection of data overproduction when, for example, an H.323 endpoint transmits more video or other data than initially negotiated, and uses the above message flow for data rate changes or other flow control mechanisms to make it generate more data. less. In the case of H.323, a "flow control command" or "logical channel rate request" message is periodically transmitted to the endpoint in question with an incrementally lower amount of "maximum bit rate" until received from the endpoint The video rate is equal to or lower than the initially negotiated rate or some other fixed rate.

[0023] The method of the present invention ca...

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Abstract

The present invention discloses a method of detecting overproduction of data when an H.323 endpoint is transmitting more video or other data than initially negotiated, and makes it produce less by utilizing standard flow control procedures. Flow control messages are sent periodically, incrementally instructing the H.323 endpoint to transmit lower amounts of bit rates, until the video rate received from the endpoint is equal to or lower than the initially negotiated rate, or some other fixed rate.

Description

Technical field [0001] The present invention relates to flow control in a video conference system. Background technique [0002] Video conferencing systems are traditionally adapted to the use of circuit-switched and packet-switched networks. As a result, efforts have been made to achieve interoperability between circuit-switched and packet-switched terminals, which provides interaction and communication without loss of quality or introduction of delay. The public standard for multimedia communication on circuit-switched networks such as ISDN is the H.320 standard from the International Telecommunication Union (ITU). The corresponding standard for packet switching is H.323. Since the present invention relates to flow control, which is a problem related to packet switching, H.323 is described in detail below. [0003] As mentioned above, H.323 is a comprehensive recommendation from the International Telecommunication Union (ITU) that sets standards for multimedia communications on...

Claims

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Application Information

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IPC IPC(8): H04N7/15H04L12/56H04L47/2416H04L47/30H04N19/89H04N21/4788H04N21/6373H04N21/647
CPCH04L65/80H04L47/30H04N7/15H04L47/10H04L47/2416Y02B60/31H04L47/263H04N21/4788H04L65/4038H04N21/64707H04L29/06027H04N21/6373Y02D30/50H04L65/1106H04L65/1104H04L65/1101
Inventor P·A·卡尔森O·L·卡尔格拉夫
Owner CISCO SYST INT R L
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