通过非预期用户设备和RIS避免电磁场暴露
Electromagnetic Field Exposure Avoidance thanks to Non-Intended User Equipment and RIS
摘要：
一方面，由于使用大规模多输入多输出（MIMO）和波束成形的新网络的部署，对高吞吐量的需求不断增长。另一方面，在一些国家或城市，不关心正在进行的通信的人们需要任意低的电磁场暴露（EMFE），这减缓了新网络的部署。最近，有人提出，在设计未来的第六代（6 G）时，除了提供更高的吞吐量之外，还提供一种新的服务类型：任意低的EMFE。最近的工作表明，可重新配置的智能表面（RIS），联合优化的基站（BS）波束成形可以提高所需位置的接收吞吐量，同时减少EMFE无处不在。在本文中，我们引入了一个新的概念，一个非预期用户（NIU）。NIU是网络的用户，当他/她没有下载/上传数据时，他/她请求低EMFE。NIU让他/她的设备（称为NIU设备（NIUE））与网络交换一些控制信令和导频，以帮助网络避免将NIU暴露于为网络的另一个用户传输数据的波：目标用户（IU），其设备称为IU设备（IUE）。具体来说，我们提出了几个新的计划，以最大限度地提高IU吞吐量下的EMFE约束在NIU（在实践中，在NIUE的干扰约束）。几个传播方案进行了研究。分析和数值计算结果表明，在有限的复杂度和信道信息下，合理的功率分配和波束优化可以显著提高电磁场约束系统的性能。
英文摘要：
On the one hand, there is a growing demand for high throughput which can be satisfied thanks to the deployment of new networks using massive multiple-input multiple-output (MIMO) and beamforming. On the other hand, in some countries or cities, there is a demand for arbitrarily low electromagnetic field exposure (EMFE) of people not concerned by the ongoing communication, which slows down the deployment of new networks. Recently, it has been proposed to take the opportunity, when designing the future 6th generation (6G), to offer, in addition to higher throughput, a new type of service: arbitrarily low EMFE. Recent works have shown that a reconfigurable intelligent surface (RIS), jointly optimized with the base station (BS) beamforming can improve the received throughput at the desired location whilst reducing EMFE everywhere. In this paper, we introduce a new concept of a non-intended user (NIU). An NIU is a user of the network who requests low EMFE when he/she is not downloading/uploading data. An NIU lets his/her device, called NIU equipment (NIUE), exchange some control signaling and pilots with the network, to help the network avoid exposing NIU to waves that are transporting data for another user of the network: the intended user (IU), whose device is called IU equipment (IUE). Specifically, we propose several new schemes to maximize the IU throughput under an EMFE constraint at the NIU (in practice, an interference constraint at the NIUE). Several propagation scenarios are investigated. Analytical and numerical results show that proper power allocation and beam optimization can remarkably boost the EMFE-constrained system's performance with limited complexity and channel information.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
