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Method for retransmission using checksums for identifying lost data packets

A technology of data grouping and data transmission, applied in the field of retransmission servers, can solve the problem that retransmission cannot be used, and achieve the effect of repair possibility

Active Publication Date: 2012-07-04
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since both UDP and MPEG2-TS lack a unique identifier for each packet, there is obviously a problem of directly identifying a specific data packet, data block or data frame in a stream and retransmission cannot be done with current technology

Method used

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  • Method for retransmission using checksums for identifying lost data packets
  • Method for retransmission using checksums for identifying lost data packets
  • Method for retransmission using checksums for identifying lost data packets

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Embodiment Construction

[0037] The present invention relates to the retransmission of lost data once sent in the absence of a unique packet sequence number per session. In the following description, the invention will be shown and described as implemented in a media services network, such as an Internet Protocol Television (IPTV) network and system. However, the invention is not limited to said applications. As will be appreciated from the following description, the present invention is also applicable to other fields of application in which data transmission using data packets lacking a unique packet sequence number per session between sender and receiver. A session is considered to be a TCP / UDP session or the like in which a certain amount of data is passed from a transmitter to a receiver in one or more sequences. As an example, the delivery of a video stream is a session.

[0038] For purposes of illustration and not limitation, the following description is set forth in specific details, such a...

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PUM

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Abstract

The present invention relates to a method for retransmission of lost data, a receiving device operating according to the invented method and a retransmission server. In the absence of a unique identifier per data packet or data frame, there is obviously a problem to directly identify a specific data packet, data block or data frame in the stream and retransmission can't take place with current technologies. The object of the present invention is to offer a retransmission method and means for making said retransmission of missing data packets possible in the absence of a unique identifier.

Description

technical field [0001] The invention relates to a method for retransmitting lost data, a receiving device operating according to the inventive method, and a retransmission server. Background technique [0002] Internet Protocol (IP) networks have become a widely used data infrastructure for communicating digital information, such as data, voice, and streaming video, locally and globally. The increasing amount of data traffic delivered over IP networks contains multimedia content. [0003] In systems for delivering media content, most of the content is often compressed. There are servers for sending out media content and receivers for receiving media content. [0004] TCP (Transmission Control Protocol) and UDP (User Data Protocol) are transport protocols used to transmit the media content. The UDP protocol is less complex than TCP, but it does not provide many of the TCP features that would make TCP so useful in certain applications, such as guaranteeing against lost, dup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/173H04L1/00H04L1/18H04L29/06H04N21/6375H04N21/6377H04N21/658
CPCH04L65/4076H04N21/6377H04L1/0061H04N21/6375H04N7/17318H04L1/1838H04L29/06455H04N21/658H04L1/1832H04L65/611
Inventor J-E·曼格斯J·哈伦J·克尔希V·索扎
Owner TELEFON AB LM ERICSSON (PUBL)