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Message header compression method, compressor and transmission system

A technology for compressing headers and transmission systems, applied in the field of data transmission, can solve the problems of long delay, time extension, and high error rate of wireless links, and achieve the effects of improving efficiency, easy implementation, and simple algorithm

Active Publication Date: 2007-05-23
HUAWEI TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0008] The CRTP scheme is an IP header compression scheme specially proposed for the RTP protocol. It can be used as a supplement to the VJHC scheme and the IPHC scheme. However, these header compression schemes are designed for wired links, and most of them use fragile differential coding. The error rate on the road is low, and these protocols can work well. However, the error rate on the wireless link is high, and presents a burst feature. At this time, the VJHC scheme, IPHC scheme and CRTP scheme will not be suitable for DVB -H's real-time business such as wireless transmission with a high bit error rate cannot guarantee the accuracy of transmission
[0009] The ROHC scheme is generally suitable for robust and effective header compression on a wireless link with a long round-trip response time and a high error rate, such as a cellular network, but the compression mechanism of the ROHC scheme is more complicated, and the increasing complexity of the compression coding algorithm Higher computing power is required, which also means longer delay, which is unfavorable for the transmission of real-time programs, and the real-time performance of DVB-H real-time services is very important, and it is obviously not suitable to adopt the ROHC solution. Moreover, DVB-H is mainly used in battery-powered handheld mobile terminals. Too complex algorithms will inevitably lead to an increase in the amount of calculations, and the power consumption of handheld mobile terminals will also increase accordingly. Battery-powered handheld mobile terminals that are very important for energy saving very serious impact
[0010] It can be seen from the above that none of the existing IP header compression schemes VJHC, IPHC, CRTP, and ROHC are suitable compression schemes for the DVB-H protocol, and none of them can effectively compress the characteristics of the IP datagram header. scheme, IPHC scheme and CRTP scheme will bring a high error rate and cannot guarantee the accuracy of transmission. The delay of ROHC scheme is too long to guarantee the real-time performance of DVB-H real-time services, and it will also bring hand-held mobile terminal functions. The increase in power consumption affects the use time of battery-powered handheld mobile terminals

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  • Message header compression method, compressor and transmission system
  • Message header compression method, compressor and transmission system
  • Message header compression method, compressor and transmission system

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Embodiment Construction

[0027] The invention provides a method for compressing headers, a compressor and a transmission system, which can effectively compress the protocol headers of DVB-H.

[0028] The specific implementation of the header compression method provided by the present invention will be described in detail below.

[0029] The IP datagram after multi-protocol encapsulation, its header part includes: MPE data segment header, IP header, UDP header, RTP header, there are a large number of redundant fields in the header, especially between the consecutive data segment headers, The embodiment of the header compression method provided by the present invention is realized by compressing these redundant fields.

[0030] Taking the Multi-Protocol Encapsulation-Forward Error Correction (MPE-FEC) frame in the DVB-H standard as an example, redundant fields that can be compressed in the IP datagram header are described in detail. According to the DVB-H standard, each MPE-FEC frame is divided into an...

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Abstract

The invention relates to a method for compressing report head, which comprises that: based on data report, generating initial frame, comparing the first data report head and the frame head of initial frame, finding out and removing the abundant information of said data report head, to generate the first compressed frame; comparing the frame heads of second data frame and last frame, finding out and removing the abundant information of data report to generate the second compressed frame. The invention also discloses a compressor with comparer and generator; the generator can generate initial frame and compressed frame via data report; the comparer can find out abundant information. The invention also discloses a transmitter with compressor and decomrpessor; the compressor can generate and send initial frame and compressed frame; the decompressor is used to receive initial and compressed frames, reduce data report via compressed frame, and store the head information. The invention can effectively compress report head, and improve transmission efficiency.

Description

technical field [0001] The invention relates to the field of data transmission, in particular to a method for compressing headers, a compressor and a transmission system. Background technique [0002] Digital Video Broadcasting Handled (DVB-H) is a transmission standard formulated by the European Digital Television Standards Organization to provide multimedia services to portable and handheld terminals through terrestrial digital broadcasting networks. Digital VideoBroadcasting-Terrestrial, DVB-T) extended application on mobile terminals. Terminals using DVB-H have lower power consumption and superior mobile reception and anti-interference performance. Therefore, this standard is suitable for small portable devices such as mobile phones and handheld computers to receive signals through terrestrial digital TV broadcasting networks, and has a very broad application potential. Application prospect. [0003] MPE data segment header 12 bytes IP header ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04W28/06
Inventor 郑平方刘容科戚达平高洁
Owner HUAWEI TECH CO LTD
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