We propose to use channel inversion power control (CIPC) to achieve one-way ultra-reliable and low-latency communications (URLLC), where only the transmission in one direction requires ultra reliability and low latency. Based on channel reciprocity, our proposed CIPC schemes guarantee the power of received signal that is used to decode the information to be a constant value $Q$, by varying the transmit signal and power, which relaxes the assumption of knowing channel state information (CSI) at the user. Thus, the CIPC schemes eliminate the overhead of CSI feedback, reduce communication latency, and explore the benefits of multiple antennas to significantly improve transmission reliability. We derive analytical expressions for the packet loss probability of the proposed CIPC schemes, based on which we determine a closed interval and a convex set for optimizing $Q$ in CIPC with imperfect and perfect channel reciprocity, respectively. Our results show that CIPC is an effective means to achieve one-way URLLC. The tradeoff among reliability, latency, and required resources (e.g., transmit antennas) is further revealed, which provides novel principles for designing one-way URLLC systems.
翻译:我们提议利用频道反向功率控制(CIPC)实现单向超可靠和低纬度通信(URLLC),只有向一个方向的传输才要求超可靠和低潜值。基于频道对等,我们提议的CIPC计划通过改变传输信号和功率来保证接收信号的力量,该信号用来解码信息为不变值$Q美元,从而降低用户对了解频道状态信息(CSI)的假设。因此,CIPC计划消除了CSI反馈的间接费用,减少了通信时长,并探索了多个天线的好处,以大幅提高传输可靠性。我们根据这些信号,我们分别确定了封闭间隔和为在CIPC中以不完善和完美的频道对等方式优化美元而设定的连接值。我们的结果表明,CIPC是实现单向 URLC的有效手段。 可靠性、延迟度和所需资源(例如传输天线)之间的交易得到了进一步披露,为设计单向ALC系统提供了新的原则。