D2D heterogeneous cellular secure transmission method based on QoS guarantee counting

Abstract

The invention discloses a D2D heterogeneous cellular secure transmission method based on QoS guarantee counting. The method comprises the steps that 1, a non-convex optimization problem is set up, wherein the optimization problem aims at maximizing the sum of the effective capacity of a cellular link and the effective capacity of a D2D link and is limited by the following constraint conditions ofthe delay-sensitive security of D2D user transmitters, the average sum peak transmitting power limitation of cellular user transmitters and the average sum peak transmitting power limitation of the D2D user transmitters; and 2, the non-convex optimization problem is solved to find the cellular user transmitter transmitting power Pc (h, theta) and the D2D user transmitter transmitting power Pd (h,theta) which can enable the sum of the effective capacity of the cellular link and the effective capacity of the D2D link to be maximum, wherein the cellular user transmitter transmitting power Pc (h,theta) and the D2D user transmitter transmitting power Pd (h, theta) are the optimal solution of the non-convex optimization problem and serve as the power distribution scheme of a D2D heterogeneouscellular network. Compared with a fixed power scheme and a cellular user constant transmitting scheme, the effective capacity sum of the overall heterogeneous network applying the scheme is greater.

Description

technical field [0001] The invention belongs to the technical field of physical layer security transmission in 5G networks, and in particular relates to a D2D heterogeneous cellular security transmission method based on statistical QoS guarantee. Background technique [0002] In order to achieve very attractive system performance of the next generation wireless communication network (5G wireless communication network), the communication technology about 5G has received extensive attention from industry and academia in recent years. The evolution of key technologies of 5G is manifested by improving different system performance indicators, such as spectral efficiency, QoS (Quality of Service) and secure transmission of information, etc. Spectrum efficiency in 5G networks can be improved in frequency / time / space domains. Because D2D (Device-to-Device) communication reuses the spectrum resources of cellular users and allows two devices with close physical distances to communicat...

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Problems solved by technology

However, in practical wireless communication systems, for example, in 5G wireless communication networks, this metric cannot accurately reflect the delay-sensitive security requirements for the following reasons: First, a highly randomly changing wireless environment cannot always guarantee a positive Secrecy capacity, so that legitimate users will lose some transmission opportunities, resulting in a decrease in the transmission rate

Secondly, cellular users and D2D users may have different service requirements, or these users may have different service requirements at different times, which will result in different delay-sensitive security requirements

However, it is difficult to describe different delay-sensitive security requirements using only secrecy capacity

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