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Method and apparatus for reliably transmitting a stream of packets with compressed headers without increasing the stream rate

A technology for compressing headers and data streams, applied in transmission systems, electrical components, etc., to solve problems such as inferior compression gain and incompatible header compression standards

Active Publication Date: 2015-10-21
THALES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] French patent application FR 2907624 proposes a header compression method that takes into account the size of the elements of the access layer, thereby minimizing their number, but the disadvantage of this method is that, on the one hand, it is not compatible with the header compression commonly used in many communication network infrastructures Standards incompatibility, especially ROHC standards, on the other hand, are not as robust in terms of compression gain as working standards derived from IETF, such as ROHC

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  • Method and apparatus for reliably transmitting a stream of packets with compressed headers without increasing the stream rate
  • Method and apparatus for reliably transmitting a stream of packets with compressed headers without increasing the stream rate
  • Method and apparatus for reliably transmitting a stream of packets with compressed headers without increasing the stream rate

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Embodiment Construction

[0035] In order to better understand the method according to the present invention, the following description is given in the context of an application where a packet with a compressed IP header applying, for example, the ROHC protocol is transmitted through a radio access layer that complies with AAL5 (ATM Adaptation Layer 5) protocol for splitting / reassembling ATM cells. This environment is merely exemplary and non-limiting, and it should be understood that the method according to the present invention is applicable to any type of header compression mechanism, and employs mechanisms for segmentation / reassembly of packets with compressed headers to produce Any radio access method with data units of a priori fixed size potentially introduces the presence of stuffing bits in said units. In particular, the use of the MPEG-TS (Moving Picture Expert Group-Transport Stream) standard is also compatible with the invention. In fact, the latter specifically defines the encapsulation for...

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Abstract

The method involves fragmenting packets by succession of cells (307, 314) having identical fixed size. A padding section (311) is provided in one of the cells. A place occupied by the padding section is utilized to insert redundancy data, where the redundancy data has a function to increase reliability to transmission errors of a compressed header (302). The redundancy data is obtained by reducing compression ratio applied by the header, where the compression ratio is determined by estimating size of the packets with the compressed header. An independent claim is also included for a system for reliably transmitting data packets with compressed headers.

Description

technical field [0001] The subject of the invention is a method and a device for improving the robustness of a stream of packets with compressed headers without increasing the bit rate and / or bandwidth by inserting redundancy. [0002] The application field of the present invention is mainly communication network, which adopts Internet protocol IP to apply network header compression technology to transmitted packets, thereby optimizing bandwidth by removing redundant information between a network header and / or multiple consecutive network headers. Background technique [0003] Header compression technology is applied to data streams such as multimedia data, which are transmitted in the form of packets through the protocol layer feature stack of the IP communication network. Notable among them are network layer applications, such as IP Internet Protocol; transport layer applications, such as User Datagram Protocol (UDP) or real-time communication protocol RTP (Real Time Trans...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L29/14H04L69/40
CPCH04L69/04H04L65/607H04L65/608H04L69/16H04L69/161H04L69/166H04L69/168H04L69/22H04L69/40H04L65/65H04L65/70
Inventor C·博杜安F·阿纳尔J·拉康
Owner THALES SA