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Data transmission optimization method based on linear network coding

A linear network coding and data transmission optimization technology, applied in the field of communication, can solve the problem of low data transmission efficiency, achieve the effect of reducing the number of retransmissions, ensuring integrity, and reducing the number of retransmissions

Inactive Publication Date: 2017-09-08
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low data transmission efficiency in traditional data transmission methods, and propose a data transmission control optimization method based on linear network coding. After the information is encoded, it is forwarded to the next relay vehicle. When the relay receives the data forwarded by the previous vehicle, it will re-encode the data before forwarding it to the next relay vehicle, and so on, until When the data information arrives at the destination, the destination vehicle decodes the received data information to restore the original data

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  • Data transmission optimization method based on linear network coding
  • Data transmission optimization method based on linear network coding
  • Data transmission optimization method based on linear network coding

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[0029] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] Vehicles are used as nodes in VANET, and the data transmission process is as follows: figure 1 The shown is mainly divided into three processes, the sending node encoding, the relay node retransmission and forwarding, and the destination node decoding. The specific analysis is as follows:

[0031] The first is to send the node code. At the sending node, the data packets to be sent (that is, original data) are first divided into several groups, each group of data packets contains m data packets, and the original data is represented by x i (x i ∈{1,2,…,m}) to represent. Then from the finite field F q Select m coding coefficients (g i1 , g i2 ,...,g im ), add it to the header of the corresponding message, and add a grouping flag to the header of the message to distinguish the encoded data. The packet data packet is encoded according to the encoding rule s...

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Abstract

The invention discloses a data transmission optimization method based on linear network coding. The method comprises the steps that 1, data information needing to be transmitted is grouped in a sending source, and the grouped data is coded through a linear network coding technique; 2, the grouped data is forwarded to a relay vehicle to be subjected to a recoding operation and forwarded; 3, if a next-hop vehicle is not a destination vehicle, the step 2 is repeated; 4, when the destination vehicle receives the data, linear correlation calculation is firstly conducted, and if the data does not have the linear correlation, the data is received; 5, a decoding operation is conducted on the received data to obtain original data through recovery, and if decoding cannot be conducted, the condition is fed back to the last-hop vehicle; and 6, if the destination vehicle cannot obtain the original data through decoding, the condition continues to be fed back to the last-hop relay vehicle until the original data is obtained through decoding. According to the method, the packet loss rate generated in the data transmission process can be effectively decreased, and the data retransmission times are decreased.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a data transmission optimization method based on linear network coding. Background technique [0002] As a fusion of the Internet of Things (IoT) and Intelligent Transport Systems (ITS), the Vehicular Ad Hoc Network (VANET) is based on the Intra-Vehicle Network, the Inter-Vehicle Network and the Vehicle-mounted Mobile Internet. , a large-scale network that connects communication terminals such as vehicle-mounted equipment, handheld devices, and roadside equipment, as well as mobile Internet infrastructure, for wireless communication and information exchange. With the rapid development and wide application of broadband mobile communication technology, as well as the rapid progress of digitization, networking, informationization and intelligent technology, communication networks with vehicles, roads and people as the theme are gradually being established. Vehicle...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L29/08
Inventor 赵海涛沈箬怡于洪苏陈思敏朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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