Maximizing throughput gain via resource allocation in D2D communications

Yucheng Wu,Weiyang Xu,Yu Qin ,Xiang He,Xiaocui Liu

doi:10.1186/s13638-017-1007-z

Yucheng Wu, Weiyang Xu + Show 3 more

Open Access

https://doi.org/10.1186/s13638-017-1007-z

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Abstract

By reusing the cellular resources, device-to-device (D2D) communication is becoming a very promising technology that greatly enhances the spectrum utilization. To harvest the benefits that D2D communications can offer, efficient resource allocation strategy is required to guarantee the demands of quality of service (QoS) for both cellular and D2D users. This paper proposes a resource allocation scheme to alleviate the performance deterioration of the D2D communications with spectrum reuse. To maximize the overall throughput gain, the proposed scheme is designed to reduce the rate loss of cellular users and improve the rate of D2D users simultaneously in a two-step manner. Specifically, it first calculates the reuse gain for a single D2D pair and a single cellular user. Next, a maximum weight bipartite matching is further proposed to select the reuse pair to maximize the overall network throughput gain. Numerical results demonstrate that the proposed resource allocation scheme can significantly improve the network throughput performance with average user rate guaranteed.

Highlights

The device-to-device (D2D) communication is widely recognized as one of the key technology of the evolving 5G architecture due to the enhanced cellular spectrum utilization [1]
A suboptimal solution could be given to the original optimization problem, maximizing the system throughput gain can take into account the performance gain of the D2D user and at the same time the performance loss of the cellular user
5 Conclusions Aiming at reducing the performance loss caused by the reuse of cellular resources by D2D users, the concept of reuse cost is proposed to measure the rate loss of cellular users

Summary

Introduction

The device-to-device (D2D) communication is widely recognized as one of the key technology of the evolving 5G architecture due to the enhanced cellular spectrum utilization [1]. In [8], a single D2D pair is allowed to reuse a single cellular user’s resource to maximize the throughput, and a closed expression of the optimal power allocation is given. In [9], the overall network throughput is maximized via reusing cellular users’ resources by multiple D2D pairs where the optimization problem is solved in three steps, i.e., access control, power allocation, and channel allocation. For the future evolution of cellular networks, it is significant to maintain the quality of service (QoS) of both cellular and D2D users To this end, this paper proposes a resource allocation algorithm that maximizes the throughput gain while reducing the rate loss of cellular users and increasing the rate of D2D users at the same time.

System model and problem formulation

Resource allocation for throughput gain maximization

Joint access control and power allocation based on multiplexing gain a

Multiple D2D users multiplex multiple cellular users’

Conclusions