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Forward retransmission method applicable to network coding transmission control protocol

A transmission control protocol and network coding technology, which is applied in the direction of error prevention/detection using return channels, which can solve problems such as low retransmission efficiency and achieve the effect of improving transmission throughput.

Inactive Publication Date: 2018-01-16
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
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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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  • Forward retransmission method applicable to network coding transmission control protocol
  • Forward retransmission method applicable to network coding transmission control protocol
  • Forward retransmission method applicable to network coding transmission control protocol

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Embodiment Construction

[0033] The present invention will be described in further 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...

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Abstract

The invention provides a forward retransmission method applicable to a network coding transmission control protocol. The method comprises steps: a transmitting end numbers a coding packet and a numberfield Pid is attached to the header of the coding packet; the transmitting end records which original packets to form each coding packet, a receiving end needs to reply an ACK packet for each received coding packet, and a field Pid-reply is attached to the replied confirmation packet; according to the Pid-reply, a network coding layer confirmation number and the original data packet information forming the coding packet, the transmitting end indirectly acquires a lost link packet, and a linked list for a retransmission packet is maintained; and when the network coding layer at the transmitting end receives a retransmission packet from an upper TCP, a forward retransmission mechanism is started and a packet in the retransmission linked list is retransmitted. Thus, a protocol based on the network coding transmission control protocol can retransmit all lost packets in a round-trip delay, and the transmission throughput rate based on the network coding transmission control protocol is improved.

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 Applications(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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