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Extension header compression

A header and decompression technology, which is applied in the field of extended header compression, can solve problems such as large memory, and achieve the effect of reducing memory usage and high compression efficiency

Inactive Publication Date: 2005-03-09
NOKIA TECH OY
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  • Abstract
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Problems solved by technology

However this will result in larger memory usage since the maximum size of the IP extension header table is the same as the maximum input packet size

Method used

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  • Extension header compression
  • Extension header compression
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Embodiment Construction

[0043] The following will be based on figure 2 A packet data transmission link between the transmitting entity 200 and the receiving entity 300 is shown to describe the preferred embodiment, and both the transmitting entity and the receiving entity use the ROHC scheme. The transmitting entity 200 and the receiving entity 300 may be routers based on an IP network such as an IP cellular network.

[0044] The compression and decompression scheme according to the preferred embodiment is designed to handle larger IP extension headers or header lists that can be attached to IPv4 or IPv6 headers.

[0045] Fig. 1 shows a schematic diagram of the format of the IP extended header field, as specified in the IETF technical specification RFC 3095 of the ROHC compressed packet. According to FIG. 1, the extended header field includes a flag byte 120, which is used to indicate the appearance of a specific compressed sequence number set in the subsequent byte 130. When compressing the correspondi...

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Abstract

A method and apparatus for controlling header compression and decompression for a link of a packet data network, wherein a predetermined header extension size for the link is initially set, and wherein a packet which will not be used as reference for subsequent decompression is transmitted from the compressor to the decompressor, if an extension header list of a size larger than the predetermined header extension size has been received. At the decompressing side, the transmission of an acknowledgement is suppressed, if an extension header list of the size larger than a predetermined header extension size configured at the decompressor has been received. Thereby, inconsistency of compression context between compressor and decompressor is prevented and a higher compression efficiency is achieved since there is no need to repair the context and correctly decompressed packets can be delivered to upper network layers without discarding any packets.

Description

Technical field [0001] The present invention relates to a method, device and system for controlling header compression and decompression in a packet data network such as an IP (Internet Protocol)-based network. Background technique [0002] In a communication network using packet data transfer, a single data packet carries the information required to transfer the data packet from the source application to the destination application in the header portion. The actual data to be transmitted is included in the payload part. [0003] The transmission path of a data packet from a source application to a destination application usually involves multiple intermediate steps represented by network nodes interconnected by communication links. The network node is called a packet switch or router, which receives the data packet and forwards it to the next intermediate router until it reaches the destination network node, which will transmit the valid data packet Load to the destination appli...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06
CPCH04L69/16H04L69/161H04L69/04H04L69/22H03M7/30H04L47/43
Inventor 张延冀凯尤·哈雨
Owner NOKIA TECH OY
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