A Relay Transmission Method Based on Network Coding Under Delay Constraint

Abstract

The invention requests protection of a delay-constrained network coding-based relay transmission method, which is mainly used to solve the problem that data packets are transmitted to destination nodes under delay constraints in a relay cooperative network. It includes the following steps: S1, the source node broadcasts the data packet, and broadcasts the data packet sequence to M (M ≥ 2) destination nodes through the relay; S2, judges whether there is a data packet that does not exceed the delay constraint; S3, generates the remaining time of the data packet Slot and rate graph model; S4, select the coding strategy, and the relay node transmits the coded packet; S5, update the receiving status and the remaining time slot of the data packet according to the feedback information of the destination node after each transmission; S6, judge whether the data packet is based on the feedback information Received by the destination node within the delay constraints, and update the multi-rate graph model. The invention allows network nodes to cache data packets and non-immediately decodable packets, the method can increase codec chances, can adapt to different channel rates, and effectively improves the effectiveness of data packet transmission.

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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