Resource Allocation for 5G-UAV-Based Emergency Wireless Communications
Resource Allocation for 5G-UAV-Based Emergency Wireless Communications
复制标题
基于5G无人机的应急无线通信资源分配
DOI：
10.1109/jsac.2021.3088684
复制
发表时间：
2021-11-01
影响因子：
16.4
通讯作者：
Zhang, Hailin
中科院分区：
文献类型：
--
作者：
Yao, Zhuohui;Cheng, Wenchi;Zhang, Hailin
对于不可预见的自然灾害，如地震、飓风、洪水等，传统的通信基础设施无法使用或严重中断，并伴随着持续的次生灾害。在这种情况下，迫切需要部署应急无线通信（EWC）网络来恢复事故/事件区域的连接。新兴的第五代(5G)/超5G （B5G）无线通信系统，如无人机（UAV）辅助网络和基于智能反射面（IRS）的通信系统，预计将被设计或重新设计，以支持灾后地区的临时高质量通信。然而，由于次生灾害导致地形变化，灾后地区的河道特征迅速变化，这对EWC网络提出了新的严峻挑战。在本文中，我们提出了一种新的异构$\mathcal {F}$复合衰落信道模型，该模型准确地模拟和表征了基于5G-UAV的EWC网络中包含反射器、路径损耗指数、衰落和阴影参数的复合衰落信道。在此基础上，用简单的封闭表达式推导出最优功率分配方案，并给出了基于最优带宽-功率联合分配方案的数值计算结果。我们推导了相应的容量，并比较了IRS与传统中继型5g无人机的能量效率。数值结果表明，与传统信道模型相适应的资源分配方案相比，新的异构Fisher-Snedecor $\mathcal {F}$复合衰落信道适应资源分配方案能够实现更高的容量和能源效率，从而为灾后地区提供更好的通信服务。
For unforeseen natural disasters, such as earthquakes, hurricanes, and floods, etc., the traditional communication infrastructure is unavailable or seriously disrupted along with persistent secondary disasters. Under such circumstances, it is highly demanded to deploy emergency wireless communication (EWC) networks to restore connectivity in accident/ incident areas. The emerging fifth-generation (5G)/beyond-5G (B5G) wireless communication system, like unmanned aerial vehicle (UAV) assisted networks and intelligent reflecting surface (IRS) based communication systems, are expected to be designed or re-farmed for supporting temporary high quality communications in post-disaster areas. However, the channel characteristics of post-disaster areas quickly change as the secondary disaster resulted topographical changes, imposing new but critical challenges for EWC networks. In this paper, we propose a novel heterogeneous $\mathcal {F}$ composite fading channel model for EWC networks which accurately models and characterizes the composite fading channel with reflectors, path-loss exponent, fading, and shadowing parameters in 5G-UAV based EWC networks. Based on the model, we develop the optimal power allocation scheme with the simple closed-form expression and the numerical results based optimal joint bandwidth-power allocation scheme. We derive the corresponding capacities and compare the energy efficiency between IRS and traditional relay based 5G-UAVs. Numerical results show that the new heterogeneous Fisher-Snedecor $\mathcal {F}$ composite fading channel adapted resource allocation schemes can achieve higher capacity and energy efficiency than those of traditional channel model adapted resource allocation schemes, thus providing better communications service for post-disaster areas.