D2D communication resource allocation method in relay cooperative heterogeneous cellular network

Abstract

The invention discloses a D2D communication resource allocation method in a relay cooperative heterogeneous cellular network, comprising the following steps: solving the maximum achievable rate threshold R<Q(n),n><dmax>of D2D communication in a frequency band n when each cellular user n adopts a communication mode Q(n); judging whether spectrum resources selected for D2D communication can meet the requirement of the quality of service of a system according to R<Q(n),n><dmax>; jointly allocating the achievable rate target R<Q(n),n><d> allocated for D2D communication in the frequency band n when the cellular user n adopts the communication mode Q(n), and determining the communication mode Q(n) of each cellular user n; and solving the total transmitting power Ptotal of the system. By adopting the method, the transmitting power of cellular users and D2D users and the optimal achievable rate target of D2D users in each frequency band can be optimized at the same time, and the communication mode of each cellular user in the system can be determined. Compared with a traditional resource allocation method, the method can reduce the total power consumption of the system while ensuring the achievable rate of cellular users and D2D users, and is more in line with the requirement of green communication.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to a method for allocating D2D (Device-to-Device) communication resources in a relay cooperative heterogeneous cellular network. Background technique [0002] In order to meet the rapidly increasing demands on spectrum resources and data rates of multimedia devices and services, wireless networks are evolving toward heterogeneous networks. With the rapid development of mobile communications, the rapid increase of multimedia devices and services has led to an exponential increase in the mobile traffic load of cell base stations, which not only makes the mobile network congested, but also increases the energy consumption of equipment. In reality, spectrum resources are limited and equipment energy consumption is limited. How to effectively increase spectrum utilization and reduce energy consumption will be a research focus. [0003] The traditional ...

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Problems solved by technology

Obviously, this cannot guarantee the QoS of cellular users and D2D users at the same time, and does not meet the requirements of green communication

[0006] Some traditional cellular networks only consider the situation where a pair of D2D communication and a cellular user share spectrum resources

However, in the actual environment, the number of cellular users is much higher than that of D2D users. If a pair of D2D communication can only reuse the spectrum resources of one cellular user, it will obviously cause a waste of spectrum resources.

[0007] Moreover, few cellular networks satisfy a multi-layered heterogeneous network model that simultaneously includes cellular users, D2D users, base stations, and relays.

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