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A Forward Retransmission Method Applicable to Network Coding Transmission Control Protocol

A technology of transmission control protocol and network coding, which is applied in the direction of using the return channel for error prevention/detection, etc., which can solve the problem of low retransmission efficiency and achieve the effect of improving the transmission throughput rate

Inactive Publication Date: 2020-03-20
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0008] If the transmission control protocol based on network coding adopts the strategy of retransmitting each lost packet sequentially within multiple round-trip delays for consecutive packet loss within a data window, it will inevitably lead to low retransmission efficiency.

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  • A Forward Retransmission Method Applicable to Network Coding Transmission Control Protocol
  • A Forward Retransmission Method Applicable to Network Coding Transmission Control Protocol
  • A Forward Retransmission Method Applicable to Network Coding Transmission Control Protocol

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In order to support the forward retransmission method, the present invention designs a new network coding NC frame header, such as figure 1 shown. figure 1 b in the new NC frame header 1 ~b 6 Corresponds to the reserved fields of the standard TCP protocol. use b 1 Identify whether the message is a TCP message or an NC message; use b 2 ~b 4 together represent the message status of the current message; use b 5 Indicates the R-flag, and indicates whether the current ACK message is to be handed over to the TCP layer according to the R-flag state. Table 1 is the message status description.

[0035] Table 1 Message status description

[0036] message status (b 2 b 3 b 4 )

describe 000 normal encoding package 001 Redundant coded packets 010 unencoded retransmission, but not the last one ...

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Abstract

The present invention provides a forward retransmission method applicable to the network coding transmission control protocol, comprising: the sending end numbers the coded message, and a number field Pid is attached to the head of the coded message; the sending end records each coded message The text is composed of several original messages. The receiving end needs to reply an ACK message for each encoded message received, and the field Pid‑reply is attached to the reply confirmation message; the sending end according to Pid‑reply, The network coding layer confirms the serial number and the original data packet information that composes the coded packet to indirectly know the message of link loss, and maintains a linked list of retransmitted messages; the network coding layer at the sending end receives the retransmitted message from the upper layer TCP When , start the forward retransmission mechanism to retransmit the messages in the retransmission linked list. The invention enables the network coding-based transmission control protocol to retransmit all lost messages within a round-trip time delay, and helps to improve the transmission throughput rate of the network-coding transmission control protocol.

Description

technical field [0001] The invention relates to the field of network transmission control protocols, in particular to a forward retransmission mechanism suitable for network coding transmission control protocols. Background technique [0002] With the rapid popularization of mobile communication devices and the advent of the 4G era, various wireless network applications have gradually penetrated into all aspects of people's lives, and wireless networks are playing an increasingly important role. Therefore, how to improve the transmission quality of the wireless network has become a hot issue that has attracted much attention. Transmission Control Protocol (TCP) has become a basic transmission protocol under the Internet because of its ability to provide reliable transmission services. [0003] In actual wireless network applications, the traditional TCP protocol is still used in the transport layer, but some unique characteristics of wireless networks have also caused serio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18
Inventor 董泽锋陈庆春唐小虎梁宏斌
Owner SOUTHWEST JIAOTONG UNIV
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