Method for calculating checksums based on data packet IP (Internet Protocol) hearder compression technology

A data packet and header compression technology, applied in the direction of network traffic/resource management, electrical components, wireless communication, etc., can solve the problems of inability to greatly improve system efficiency, waste system resources, reduce computing efficiency, etc., and achieve stable and reliable performance. , Improve the decompression efficiency and reduce the consumption effect

Active Publication Date: 2010-10-13
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the checksum of the same field content is repeatedly calculated in each data packet, the calculation efficiency will be greatly reduced, and the amount of useless calculation will be increased, system resources will be wasted to a certain extent, and the system will not be greatly improved. efficiency

Method used

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  • Method for calculating checksums based on data packet IP (Internet Protocol) hearder compression technology
  • Method for calculating checksums based on data packet IP (Internet Protocol) hearder compression technology
  • Method for calculating checksums based on data packet IP (Internet Protocol) hearder compression technology

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Embodiment Construction

[0076] In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

[0077] see Image 6 As shown, the method for realizing the checksum calculation based on the data packet IP header compression technology includes the checksum calculation process in the data packet IP header compression process at the data packet sending end and the data packet IP header decompression process at the data packet receiving end. Checksum calculation processing, the data packet includes a content fixed field, a content basically unchanged field and a content change field, and the described content fixed field includes a source IP address field, a destination IP address field, a UDP source port number field, UDP destination port number field, and synchronization source identifier field; the content basically unchanged field includes the first 16 bits of the RTP data packet, namely V, P, X, CC, M, PT and participating source ident...

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Abstract

The invention relates to a method for calculating checksums based on a data packet IP hearder compression technology, wherein in the decompression process, checksums are respectively calculated according to the property of each field of UDP (User Datagram Protocol) and TCP (Transmission Control Protocol) checksums; the checksums are calculated for only one time for invariable fields in the whole stream life cycle; for the basically invariable fields, firstly, the fields are compared with the original IP packet, and if that the fields are not changed is discovered, the checksums do not need to be calculated. By adopting the method for calculating checksums based on the data packet IP hearder compression technology, the consumption of a processor time slice is reduced, the decompression efficiency is improved, the length of the fields which need to be calculated by the compression checksum calculating method is obviously reduced, and for IPv4 / UDP / RTP packets the net load length of which is 20 bytes, the compression checksum calculating method can save calculating amount by 1.7 times, thereby effectively improving the efficiency of IP header compression, reducing the calculating amount of the checksums and saving the system resource expenses; and moreover, the method has fast and convenient processing process, stable and reliable working performance and wider range of application.

Description

technical field [0001] The invention relates to the field of data communication, in particular to the technical field of IP header compression of data packets, and specifically refers to a method for realizing checksum calculation based on the IP header compression technology of data packets. Background technique [0002] First, the IP header compression algorithm is introduced as follows: [0003] For services that need to use IP packets to be transmitted on the wireless network, in order to obtain better spectrum efficiency, some header compression algorithms need to be used. see figure 1 As shown, the size of the combined IP / UDP / RTP information is at least 40 bytes, while the payload of the IP voice service may only be about 20 bytes or even less. RFC2507 is a description of the IP header compression algorithm. A typical UDP header or TCP header can be compressed to a size of 4-7 bytes, which also includes a 2-byte UDP checksum or TCP checksum . For another example, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/06
Inventor 庄云腾
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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