School of Information and Communication Engineering, Chungbuk National University, Chungju 28644, Korea.
Sensors (Basel). 2021 Mar 9;21(5):1914. doi: 10.3390/s21051914.
In a cellular communication system, deploying a relay station (RS) is an effective alternative to installing a new base station (BS). A dual-hop network enhances the throughput of mobile stations (MSs) located in shadow areas or at cell edges by installing RSs between BSs and MSs. Because additional radio resources should be allocated to the wireless link between BS and RS, a frame to be transmitted from BS is divided into an access zone (AZ) and a relay zone (RZ). BS and RS communicate with each other through the RZ, and they communicate with their registered MSs through an AZ. However, if too many MSs are registered with a certain BS or RS, MS overloading may cause performance degradation. To prevent such performance degradation, it is very important to find the proper positions for RSs to be deployed. In this paper, we propose a method for finding the sub-optimal RS deployment location for the purpose of load-balancing and throughput enhancement. The advantage of the proposed method is the efficiency in find the sub-optimal location of RSs and its reliable tradeoff between load-balancing throughput enhancement. Since the proposed scheme finds the proper position by adjusting the distance and angle of RSs, its computational complexity lower than other global optimization approach or learning-based approach. In addition, the proposed scheme is constituted with the two stages of load-balancing and throughput enhancement. These procedures result in the appropriate tradeoff between load-balancing and throughput enhancement. The simulation results support these advancements of the proposed scheme.
在蜂窝通信系统中，部署中继站（RS）是替代安装新基站（BS）的有效方法。双跳网络通过在 BS 和 MS 之间安装 RS，增强了位于阴影区域或小区边缘的移动站（MS）的吞吐量。由于需要为 BS 和 RS 之间的无线链路分配额外的无线电资源，因此要传输的帧被分为接入区（AZ）和中继区（RZ）。BS 和 RS 通过 RZ 进行通信，它们通过 AZ 与注册的 MS 进行通信。然而，如果太多的 MS 注册到某个 BS 或 RS，MS 过载可能会导致性能下降。为了防止这种性能下降，找到 RS 的适当位置进行部署非常重要。在本文中，我们提出了一种用于寻找 RS 部署的次优位置的方法，以实现负载均衡和吞吐量增强。该方法的优点是在寻找 RS 的次优位置方面效率高，在负载均衡和吞吐量增强之间具有可靠的权衡。由于该方案通过调整 RS 的距离和角度来找到适当的位置，因此其计算复杂度低于其他全局优化方法或基于学习的方法。此外，该方案由负载均衡和吞吐量增强两个阶段组成。这些过程在负载均衡和吞吐量增强之间实现了适当的权衡。仿真结果支持了该方案的这些改进。
