5G network operators consider the dense deployment of small base-stations (SBSs) to increase network coverage and capacity. Hence, operators face the challenge of X-hauling, i.e., backhauling or fronthauling, their traffic to the core network. Also, SBSs densification will increase the possibility of failure of these X-haul links. To cope with this problem, an X-haul outage compensation scheme with the assistance of Reconfigurable Intelligent Surfaces (RIS) is proposed to mitigate or at least alleviate the effect of X-haul failure. The RIS is a newly adopted technology that is able to improve the performance of wireless networks. In this paper, we present and evaluate an X-haul outage compensation scheme based on placing a number of RIS panels in pre-planned locations to mitigate the effect of X-haul failure. This evaluation is done using frequencies below and beyond 6 GHz. Based on our analytical results, the proposed RIS scheme shows that placing a sufficient number of RIS elements in proximity to the failed SBS under certain conditions can help acquire the same X-haul rate before the occurrence of the failure. Also, we show that for high X-haul spectral density, the RIS-assisted transmission with a certain number of elements can be more energy-efficient than line-of-sight and non-line-of-sight transmissions. Finally, the system's energy efficiency is addressed with and without RIS, and the optimal number of RIS reflecting elements is derived.
翻译:5G网络操作员考虑密集部署小型基地站(SBS)以增加网络覆盖面和能力。因此,操作员面临X光的挑战,即回航或前航,他们向核心网络的交通量。此外,SBS密度化将增加这些X光连接失败的可能性。为了解决这一问题,提议在可再配置智能表面(RIS)的协助下,实施X光机故障补偿计划,以减少或至少减轻X光失灵的影响。RIS是一种新采用的技术,能够改善无线网络的性能。在本文件中,我们提出并评价X光断层补偿计划,在预先规划的地点设置若干RIS板,以减轻X光断层的影响。根据我们的分析结果,拟议的RIS计划显示,在一定条件下将足够的RIS元素放在离S-ha失灵点附近,在一定条件下,在不进行无线的SBS-光网运行的情况下,我们提出和评估X光光光光热传输率的X光断层值计划。