Relay transmission method based on network coding under delay constraints

Abstract

The invention discloses a relay transmission method based on network coding under delay constraints. The method is mainly used for solving the problem of transmitting a data packet in a relay cooperative network to a destination node under delay constraints. The method comprises the following steps: S1, broadcasting, by a source node, a data packet, and broadcasting a data packet sequence to M (Mis greater than or equal to 2) destination nodes through a relay; S2, judging whether a data packet that does not exceed the delay constraints exists; S3, generating a data packet remaining time slotand a rate graph model; S4, selecting a coding strategy, and transmitting, by a relay node, an encoded packet; S5, updating a receiving state and the remaining time slot of the data packet according to the feedback information of the destination node after each transmission; and S6, judging whether the data packet is received by the destination node within the delay constraint s according to the feedback information, and updating the multi-rate graph model. By adoption of the relay transmission method disclosed by the invention, the network node is allowed to buffer the data packet and does not immediately decode the encoded packet, the coding and decoding opportunity can be increased, the method can be adaptive to different channel rates, and the data packet transmission validity is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of data packet transmission under a relay cooperative wireless network, and in particular relates to a network coding-based relay transmission method under delay constraints. Background technique [0002] With the great progress of wireless networks and communication technologies, users have higher requirements for wireless networks, such as real-time video, virtual reality, online live broadcast, online shopping, online games and other services. The data packet delay in these scenarios is relatively sensitive. However, because wireless transmission is susceptible to interference, data packets are easily lost or exceed the delay constraint, which will affect the transmission efficiency of the wireless network. High delay will also reduce data availability and affect user experience. In the traditional data transmission method, the nodes can only store and forward the received data packets sequentially, resul...

AI Technical Summary

Problems solved by technology

However, because wireless transmission is susceptible to interference, data packets are easily lost or exceed the delay constraint, which will affect the transmission efficiency of the wireless network. High delay will also reduce data availability and affect user experience.

In the traditional data transmission method, the nodes can only store and forward the received data packets one by one, resulting in more transmission times, low transmission efficiency and large network overhead

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