Multicast retransmission method and device based on D2D cluster under high packet loss probability

Abstract

The invention relates to the communication technology, in particular to a multicast retransmission method and device based on a D2D cluster under high packet loss probability. The multicast retransmission method includes the steps that (1) before a multicast service is started, a terminal with a multicast service requirement is built into the D2D cluster, and after the cluster is built, a eNB broadcasts a data packet to the D2D cluster in a multicast mode; (2) after a cluster head and cluster members receive the multicast data packet, the cluster head forms the feedbacks of the cluster members into a feedback table, and a sliding window is built and initialized; (3) in the sliding window, the cluster head detects the feedback table and executes the corresponding operation; (4) in the sliding window, the cluster head retransmits and collects a data packet which is not decoded correctly through intra-cluster cooperation; (5) the cluster head carries out network encoding on the retransmitted data packet after collecting the lost data packet, broadcasts the network encoded packet to the cluster members in a multicast mode, updates the feedback table and the sliding window and executes the steps from (3) to (5) again. The multicast retransmission device is provided with a multicast sending module, a receiving module, a feedback module, an intra-cluster cooperation retransmission module, a network encoding module and an updating module.

Description

technical field [0001] The present invention relates to communication technology, in particular to a D2D cluster-based multicast retransmission method and device under high packet loss rate. Background technique [0002] Mobile communication networks are developing toward higher data transmission rates, greater resource utilization and higher network capacity, which puts forward higher requirements for future wireless spectrum resources. However, the available wireless spectrum resources are very limited, so how to realize high-speed communication in the limited spectrum resources has become the focus of research in the industry. D2D (device to device, device to device) communication technology can be used to improve resource utilization and network capacity by multiplexing the resources of the cellular network. In the wireless multicast system, in order to ensure the reliability of data transmission, FEC (Forward Error Correction, forward error correction technology) and A...

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Problems solved by technology

[0006] Chinese patent CN103916223A proposes a D2D cooperative retransmission method based on genetic algorithm, which selects the multicast retransmission sender in the D2D cluster according to the optimized objective function and through genetic algorithm. Although this method improves the spectrum efficiency, it greatly Increased processing complexity and delay

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