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Robust header compression state retrieval method and compressor

A technology of robust header compression and compression state, applied in digital transmission system, error prevention, electrical components, etc., can solve problems such as decompression failure of the decompressor, and achieve the effect of improving robustness

Active Publication Date: 2019-12-03
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For Transmission Control Protocol (TCP) services, the compressor believes that there are two cases of packet loss at the receiving end: one is to detect a feedback packet (duplicate ack) sent by the receiving end, and the other is to detect a duplicate ack sent by the sending end. The packet loss in the above two cases may be caused by the transmission process, or it may be caused by the decompression failure of the decompressor. However, the packet loss during the transmission process does not require the compressor to perform state reversion, and the decompressor decompresses it. For packet loss caused by failure, the compressor needs to perform state reversion. Therefore, if the compressor cannot determine the cause of packet loss, the state reversion will inevitably reduce the robustness of TCP service header compression.

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  • Robust header compression state retrieval method and compressor

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Embodiment Construction

[0043] In U mode, the robustness of header compression is ensured through periodic relocation. In U mode, the decompressor will not send feedback information to the compressor about whether the decompression is correct or wrong. I don't know that the decompression error of the decompressor is still compressed according to the current compression state, and the state reversion is not performed until the cycle point of the cycle relocation arrives. This is because of the packet loss caused by the decompression error. The embodiment of the present invention is based on the above-mentioned U mode. features presented. Therefore, the embodiment of the present invention is mainly aimed at the method for returning the TCP service robust header compression state realized in the U mode, figure 1 It is an application schematic diagram of the method for returning the state of robust header compression in the embodiment of the present invention, and the TCP service is divided into upload a...

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Abstract

Disclosed is a back transition method for a robust header compression state. The method comprises: performing back transition of a compression state of a compressor when the compressor determines, according to a comparison result of a sequence number carried in a received TCP special packet and sequence numbers of lost TCP service packets in a sliding window, that state back transition needs to be performed. Also disclosed are a compressor and a computer storage medium.

Description

technical field [0001] The present invention relates to a robust header compression (RObust Header Compress, ROHC) technology, in particular to a method and a compressor for returning a state of robust header compression. Background technique [0002] In order to effectively utilize wireless channel bandwidth resources, ROHC is introduced. The ROHC is described by the RFC3095 protocol of the Internet Engineering Task Force (IETF). The RFC3095 protocol defines three compression modes, which are unidirectional mode (Unidirectional mode, U mode), bidirectional optimal mode (Bidirectional Optimistic mode, O mode), and bidirectional reliable mode (Bidirectional Reliable mode, R mode). The compression states of the ROHC compressor are the initial state (IR), the first-order state (FO) and the second-order state (SO) from low to high, and the compression efficiency of these three compression states is from low to high. Different compression modes ensure the robustness of header c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L29/06
CPCH04L1/00
Inventor 武见刘鑫董建军贺保国
Owner ZTE CORP