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Method and system for improving packet loss calculation accuracy at MPEG-TS (moving picture expert group-transmission stream) layer

A technology of MPEG-TS and the number of lost packets is applied in the field of communication testing to achieve the effect of improving calculation accuracy

Inactive Publication Date: 2012-12-19
DEKSCOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, as long as more than 3 IP packets are lost consecutively in the network, MPEG-TS packet loss may exceed 16

Method used

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  • Method and system for improving packet loss calculation accuracy at MPEG-TS (moving picture expert group-transmission stream) layer

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Embodiment 1

[0039] The present invention discloses a method and system for improving the accuracy of calculating the number of lost packets in the MPEG-TS layer. When the video media stream transmission protocol stack is MPEG-TS / RTP / UDP / IP / Ethernet, the MPEG is calibrated according to the number of lost packets in RTP - The number of TS packet loss, which improves the calculation accuracy of the number of video packet loss in the MPEG-TS layer.

[0040] According to the description in the background technology, it can be seen that the traditional MPEG-TS packet loss algorithm calculates the number of TS packet loss based on the CC field. This algorithm cannot accurately calculate the number of packet loss in the case of sudden IP network packet loss; The serial number field of the RTP layer can accurately calculate the number of lost RTP packets; MPEG-TS packets are encapsulated in RTP packets according to certain specifications and transmitted in the IP network. In the current IPTV netwo...

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Abstract

The invention discloses a method and a system for improving packet loss calculation accuracy at an MPEG-TS (moving picture expert group-transmission stream) layer. The method comprises the steps as follows: average video TS packet number (Nc=A` / B`) included in one RTP (real time protocol) packet in a certain monitored IPTV (internet protocol television) video stream in a sampling period is calculated; in the sampling period, the overall video TS packet loss number Nv is calculated according to a CC (communication center) field of the MPEG-TS layer; the overall packet loss number Nr is calculated according to the serial number field of a RTP layer; meanwhile, the maximum RTP packet loss length Np is calculated; after the sampling period is finished, if the value of Np * Nc is more than a preset value M, then continuous and burst IP (internet protocol) packet loss exist in the sampling period by judgment; moreover, the video TS packet loss number is caused to be inaccurately counted; and the video TS packet loss number N is equal to Nv plus (Nr multiplied by Nc minus Nv); otherwise, the video TS packet loss number N is not needed to be corrected and N is equal to Nv. The invention improves the packet loss calculation accuracy at the MPEG-TS layer by using the RTP packet loss number to correct the MPEG-TS packet loss number under the condition that a video media stream transmission protocol is MPEG-TS / RTP / UDP(User Datagram Protocol) / IP(internet protocol) / Ethernet.

Description

technical field [0001] The invention belongs to the technical field of communication testing, and relates to a method for calculating the number of lost packets at the MPEG-TS layer, in particular to a method for improving the accuracy of calculating the number of lost packets at the MPEG-TS layer; -A system for the accuracy of the number of packets lost at the TS layer. Background technique [0002] In recent years, with the rapid development of IP networks and applications and the increasingly intensified competition in the communication market, major telecom operators around the world are setting off an upsurge of IPTV network construction and triple play business development. At the same time, cable TV operators have accelerated the conversion of digital TV and the transmission of IP-based mainline program signals. [0003] As a digital video service, IPTV must compete with traditional cable TV. Since people have become accustomed to the low charging standards and unin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/647
Inventor 吴雪波
Owner DEKSCOM TECH