Future wireless cellular networks must support both enhanced mobile broadband (eMBB) and ultra reliable low latency communication (URLLC) to manage heterogeneous data traffic for emerging wireless services. To achieve this goal, a promising technique is to enable flexible frame structure by dynamically changing the data frame's numerology according to the channel information as well as traffic quality of service requirements. However, due to nonorthogonal subcarriers, this technique can result in an interference, known as inter numerology interference (INI), thus, degrading the network performance. In this work, a novel framework is proposed to analyze the INI in the uplink cellular communications. In particular, a closed form expression is derived for the INI power in the uplink with a flexible frame structure, and a new resource allocation problem is formulated to maximize the network spectral efficiency (SE) by jointly optimizing the power allocation and numerology selection in a multi user uplink scenario. The simulation results validate the derived theoretical INI analyses and provide guidelines for power allocation and numerology selection.
翻译:未来无线蜂窝网络必须支持增强的移动宽带(EMBB)和超可靠的低潜伏通信(URLLC),以管理新兴无线服务的不同数据传输。为实现这一目标,一个有希望的技术是,根据频道信息动态地改变数据框架的数值以及服务要求的流量质量,从而能够建立灵活的框架结构。然而,由于非横向子载体,这种技术可能导致干扰,即所谓的“跨数字干扰”(INI),从而降低网络的性能。在这项工作中,提议了一个新框架,在上链接移动电话通信中分析INI。特别是,在与灵活框架结构的上链接中,为INI动力生成了封闭的表达形式,并形成了一个新的资源分配问题,以通过在多用户上链接情景中共同优化电力分配和数字选择,最大限度地提高网络光谱效率。模拟结果验证了衍生的INI理论分析,并为权力分配和数字选择提供了指南。