Large-scale D2D communication method based on HARQ assisted NOMA

Abstract

The invention discloses a large-scale D2D communication method based on an HARQ assisted NOMA. The method comprises the steps of firstly using a random geometric method to analyze the influence of superimposed interference in a D2D network on an outage probability; then deducing a specific expression of spectrum efficiency by using a relation between the outage probability and the spectrum efficiency; and at last building a resource distribution optimization problem based on theoretical analysis results: by reasonably setting the information transmission rates of different D2D users, even occupying the distribution density of the D2D terminal having the same time frequency resources, the spectrum efficiency (throughput capacity or spatial spectrum utilization rate) is maximized and meanwhile the communication reliability is ensured. Simulation and numerical results show that the outage probability of the collaborative application scheme provided by the invention is reduced by 23% thanthat of the non-collaborative mode; in addition, the spectrum efficiency of the method using the non-orthogonal multiple access (NOMA) technology is improved by 17% than that using the orthogonal multiple access (OMA) technology.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a large-scale D2D communication method based on HARQ-assisted NOMA. Background technique [0002] According to the white paper ITU-R M.2083-0 issued by the ITU, the goal of the next generation mobile cellular network (5G) is not only to enhance mobile broadband services, but also to provide wireless links that support a large number of terminals in the future Internet of Things mode, At the same time, it is necessary to ensure ultra-reliable and low-latency communication services. Supporting massive machine-form connections in the Internet of Things, as well as providing ultra-reliable and low-latency communication for certain services. These new requirements have brought unprecedented challenges to traditional communication based on Orthogonal Multiple Access (OMA) and base station. Therefore, 3GPP considers adopting more greedy schemes with high spectru...

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Problems solved by technology

[0003] In order to further improve spectrum utilization, the present invention applies NOMA technology to D2D communication. However, when D2D communication is applied on a large scale, it will encounter a very fatal technical bottleneck, that is, between limited spectrum resources and excessive spectrum reuse. The contradiction between them leads to strong network superimposed interference on the terminal equipment, which eventually leads to a sharp decline in the receiving performance of the receiver, such as a decrease in spectral efficiency and an increase in outage probability

However, when a large number of previous research works discussed large-scale D2D networks, they did not consider how to improve the negative effects of strong network superposition interference.

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