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Method for returning of robust header compression state and compressor

A robust header compression, compression state technology, applied in digital transmission systems, error prevention, electrical components, etc., to achieve the effect of improving robustness

Active Publication Date: 2016-05-18
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 the feedback message (duplicate ack) sent by the receiving end, and the other is to detect that the sending end sends a retransmission message , 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, and the packet loss during the transmission process does not require the compressor to perform state reversion, and is caused by the decompression failure of the decompressor If the packet is lost, the compressor needs to perform state retrieval. Therefore, if the compressor cannot determine the cause of the packet loss, the state retrieval will inevitably reduce the robustness of TCP service header compression.

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  • Method for returning of robust header compression state and compressor
  • Method for returning of robust header compression state and compressor
  • Method for returning of robust header compression state 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 proposed. 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 a schematic diagram of the application 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 upl...

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Abstract

The invention discloses a method for returning of a robust header compression state. The method comprises: according to a comparison result of a serial number carried by a received transmission-control-protocol (TCP) special message and a serial number of a packet-loss TCP service message in a sliding window, a compressor determines that the compression state is returned when state returning needs to be carried out. In addition, the invention also discloses a compressor.

Description

technical field [0001] The present invention relates to a robust header compression (RObustHeaderCompress, ROHC) technology, in particular to a method and a compressor for returning a robust header compression state. 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 (Internet Engineering Task Force, IETF). Three compression modes are defined in the RFC3095 protocol, which are unidirectional mode (Unidirectional mode, U mode), bidirectional optimal mode (BidirectionalOptimistic mode, O mode), and bidirectional reliable mode (BidirectionalReliable 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 ...

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Application Information

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