Reconfigurable Intelligent Surfaces (RISs) are one of the key emerging 6th Generation (6G) technologies that are expected to improve the link budgets between transmitters and receivers by adding artificial propagation paths. In such re-configured propagation environment, Downlink (DL) Multi-User Multi-Input Multi-Output (MU-MIMO) brings capacity improvement to cellular networks. It benefits from the spatial dimension offered by MIMO systems to enable simultaneous transmission of independent data streams to multiple users on the same radio resources by applying appropriate Beamforming (BF) schemes. However, in some cases, serving the same subset of users for a long period of time may cause some undesired regions where the average Electromagnetic Field Exposure (EMFE) exceeds the regulatory limits. To address this challenge, we propose in this paper a novel Electromagnetic Field (EMF) aware MU-MIMO BF scheme that aims to optimize the overall capacity under EMF constraints in RIS-aided cellular networks.
翻译:重新配置的智能表面(RIS)是新兴的第6代(6G)关键技术之一,预计将通过添加人工传播路径来改善发射机和接收器之间的联系预算。在这种重新配置的传播环境中,Downlink(DL)多用户多投入多产出(MU-MIMO)使蜂窝网络的能力得到提高。它得益于MIMO系统提供的空间层面,通过应用适当的Beamform(BF)计划,能够在同一无线电资源上同时向多个用户传输独立数据流。然而,在某些情况下,长期为同一组用户提供服务,可能导致一些不理想的区域,因为那里的电磁场平均接触超过监管限度。为了应对这一挑战,我们在本文件中提议建立一个新的电磁场,了解MU-MIMO BF计划,目的是在RIS辅助的蜂窝网络中优化在EMF限制下的总体能力。