Graph-Based File Dispatching Protocol With D2D-Enhanced UAV-NOMA Communications in Large-Scale Networks
Graph-Based File Dispatching Protocol With D2D-Enhanced UAV-NOMA Communications in Large-Scale Networks
复制标题
大规模网络中基于图的文件调度协议和 D2D 增强型 UAV-NOMA 通信
DOI：
10.1109/jiot.2020.2994549
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发表时间：
2020-09
影响因子：
10.6
通讯作者：
Ye Jin
中科院分区：
文献类型：
--
作者：
Baoji Wang;Rongqing Zhang;Chen Chen;Xiang Cheng;Liuqing Yang;Hang Li;Ye Jin
无人机作为一种新兴的通信辅助设备，可以将数据文件快速分发到特定区域，支持复杂地形下通信链路的快速部署，对于满足灾害和偏远地区的特定通信需求具有重要意义。非正交多址接入（NOMA）技术作为第五代（5G）及未来移动的通信系统中的一种新兴技术，因其能够提高频谱利用率、降低传输时延，从而提高整体服务质量（QoS），满足严格的通信要求而受到广泛研究。基于此，本文提出了一种设备到设备（D2 D）增强的UAV-NOMA网络架构，在该架构中引入D2 D技术以提高文件分发效率。在我们提出的D2 D增强的UAV-NOMA网络中，已经接收到文件块（FB）的地面用户（GUE）被允许重用分配给NOMA链路的时频资源，以与其他GUE共享其FB，这显著提高了文件分发的效率。但这也导致了复杂的干扰环境。为了有效地管理干扰并最小化无人机辅助文件分发使命时间，提出了一种基于图的文件分发（GFD）协议，该协议将复杂的联合优化问题分解为有效求解，并提出了基于图论的资源分配算法。仿真结果验证了我们提出的D2 D增强的UAV-NOMA网络架构的优势和我们设计的GFD协议在最小化总的无人机辅助文件分发使命时间的效率。
As a newly emerging communication assistant equipment, unmanned aerial vehicles (UAVs) can be exploited to dispatch data files quickly to specific areas and support rapid deployment of communication links in complex terrain, which is of great significance for specific communication demands in disaster and remote areas. Nonorthogonal multiple access (NOMA), as a rosy technology in the fifth generation (5G) and future mobile communication systems, has been widely studied because of its ability in improving spectral efficiency and reducing transmission latency to enhance the overall Quality of Service (QoS) and meet the strict communication requirements. Based on these, in this article, we propose a device-to-device (D2D)-enhanced UAV-NOMA network architecture, in which D2D is introduced to increase the file dispatching efficiency. In our proposed D2D-enhanced UAV-NOMA network, the ground users (GUEs) that have already received file blocks (FBs) are allowed to reuse the time–frequency resources assigned to NOMA links to share their FBs with other GUEs, which significantly improves the efficiency of file dispatching. But this also leads to a complicated interference environment. In order to effectively manage the interference and minimize the UAV-assisted file dispatching mission time, we propose a graph-based file dispatching (GFD) protocol, in which the complicated joint optimization problem is decomposed to be solved efficiently and graph theory-based algorithms are proposed for resource allocation. The simulation results verify the advantages of our proposed D2D-enhanced UAV-NOMA network architecture and the efficiency of our designed GFD protocol in minimizing the total UAV-assisted file dispatching mission time.
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