Two of the main problems to achieve ultra-reliable low-latency communications (URLLC) are related to instantaneous channel state information (I-CSI) acquisition and the coexistence with other service modes such as enhanced mobile broadband (eMBB). The former comes from the non-negligible time required for accurate I-CSI acquisition, while the latter, from the heterogeneous and conflicting requirements of different nodes sharing the same network resources. In this paper, we leverage the I-CSI of multiple eMBB links and the channel measurement's history of a URLLC user for multi-antenna beamforming design. Specifically, we propose a precoding design that minimizes the transmit power of a base station (BS) providing eMBB and URLLC services with signal-to-interference-plus-noise ratio (SINR) and outage constraints, respectively, by modifying existing I-CSI-based precoding schemes to account for URLLC channel history information. Moreover, we illustrate and validate the proposed method by adopting zero-forcing (ZF) and the transmit power minimization (TPM) precoding with SINR constraints. We show that the ZF implementation outperforms TPM in adverse channel conditions as in Rayleigh fading, while the situation is rapidly reversed as the channel experiences some line-of-sight (LOS). Finally, we determine the confidence levels at which the target outage probabilities are reached. For instance, we show that outage probabilities below $10^{-3}$ are achievable with more than 99$\%$ confidence for both precoding schemes under favorable LOS conditions with 16 transmit antennas and 500 samples of URLLC channel history.
翻译:实现超可靠低延迟通信(URLLC)的两个主要问题与瞬时频道状态信息(I-CSI)的获取和与其他服务模式(如增强移动宽带(EMBB))共存有关,前者来自准确获取I-CSI所需的非可忽略时间,而后者则来自共享相同网络资源的不同节点的不同和相互冲突的要求。在本文件中,我们利用多个 EMBB 链接的 I-CSI 和频道测量历史的 URLL 用户的多通量成型设计用户的 URLC 用户的历史。具体地说,我们建议设计一个预编码设计,最大限度地减少基地站(BSB)的传输能力,提供eMB和URLC 服务,提供信号到互让互让性比率(SINRR),以及使用现有基于 I-CSI 的预编码计划来核算URLC 历史信息。此外,我们用零向前的(ZF) 和传输速度最小性(TPMM) 的交付能力最小化方法,在SIM 之前的路径上,我们用RELLA 快速的状态显示,在最后的状态下,我们显示轨道的状态的状态下,我们正变变变变的状态正在显示,在最后的状态的状态的状态下显示,我们正在显示轨道的状态的状态的状态的状态的状态是快速状态。