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A method of data packet retransmission based on network coding

A network coding and data packet technology, applied in the field of data packet retransmission based on network coding, can solve the problem that the application of network coding has not been studied, and achieve the effect of improving system performance

Active Publication Date: 2016-06-15
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This special scenario is only applicable to some occasions, for example, the downlink from the base station to the user, but in a single-hop wireless network with multiple senders and multiple receivers (MSMR for short), the network coding is in the retransmission applications in the

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  • A method of data packet retransmission based on network coding
  • A method of data packet retransmission based on network coding
  • A method of data packet retransmission based on network coding

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Embodiment Construction

[0026] A non-limiting embodiment is given below in conjunction with the accompanying drawings to further illustrate the present invention.

[0027] In the present invention, the wireless network we consider is a one-hop scenario, which contains n nodes, each node can be either a sender or a receiver, and all data packets can be directly transmitted without relay nodes. Assuming that each sender competes fairly for the transmission channel, use p eIndicates the probability of transmission failure. When the receiver does not receive the data packet or does not obtain the lost data packet through decoding, the sender performs retransmission. If network coding is not used, the traditional retransmission mechanism is to let the sender send the lost data packets separately, and the network coding retransmission mechanism can broadcast and send the encoded data packets formed by encoding multiple lost data packets in one time slot. we use figure 2 The example in is used to illustr...

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Abstract

The invention provides a data packet retransmission method based on network coding in a wireless network. In retransmission, with p nc The probability of using network coding to send an encoded packet is an encoded fusion of N lost packets, where the N lost packets include the one lost packet that the sender needs to perform a retransmission and the N lost by the other sender -1 data packet, considering compatibility, PNCRM is designed according to the existing IEEE802.11MAC protocol, the transmission process of PNCRM is similar to IEEE802.11, and also uses RTS-CTS-data packet-ACK or NAK handshake protocol, when the transmission is successful , send an ACK frame, and when the transmission fails, send a NAK frame and perform retransmission. Compared with existing network coding techniques, PNCRM can be applied in MSMR single-hop wireless networks without relay nodes, and the appropriate retransmission probability p nc And the coding degree N can effectively improve the system performance.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data packet retransmission method based on network coding. Background technique [0002] In a wireless network, due to the influence of noise and multipath fading on the transmission channel, wireless communication has a more serious packet loss rate than traditional wired communication. In order to improve the reliability of transmission, error control technology needs to be adopted. ARQ (Automatic Retransmission-reQuest, automatic retransmission request) technology and FEC (Forward Error Correction, forward error correction) technology are two commonly used error control technologies. The automatic retransmission request realizes the reliable transmission of the network by the receiver requesting the sender to retransmit the wrong data packet or the lost data packet. Based on the automatic retransmission request method, the sender needs to rebroadcast a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/18
Inventor 刘期烈吴阳阳李云曹傧封彬刘剑锋魏武李国军
Owner CHONGQING UNIV OF POSTS & TELECOMM