ID 原文 译文
51307 可见光通信（VLC）作为射频通信的有效补充技术，可提供高速率、超低时延、绿色环保、低成本和安全可靠的通信服务。 As a beneficial supplement to radio frequency communication, Visible Light Communication(VLC) can provide high-speed, ultra-low delay, green, low-cost, safe and reliable communication services.
51308 但覆盖范围受限和链路遮挡已成为VLC系统可靠通信的瓶颈。 However, limited coverage range has become the bottleneck of long distance and reliable communication in VLC system.
51309 针对上述问题，在VLC中采用中继技术是一种有效方法。 Since the coverage range of VLC is limited, an effective method is proposed to use relay technology in VLC system.
51310 文章从中继技术的功能特性出发，分析中继协作的VLC系统模型， The paper starts from the functional characteristics of relay technology, and analyzes the relay system model.
51311 对中继协作的VLC系统的应用场景、组网方式、转发策略、调制方式、工作模式和多址接入等关键技术进行综述， Then we give a review on several key technologies of relay-assisted VLC, including the application scenario, network mode, transfer agreement, modulation mode, working mode and non-orthogonal multiple access.
51312 并对采用相应关键技术中继协作的VLC系统的可靠性、安全性和能效性进行分析， The reliable performance, safety and energy efficiency with the corresponding key technologies are analyzed.
51313 最后提出采用非正交多址、多输入多输出和全双工模式的多中继协作的VLC异构网络是未来通信网络的研究重点和方向。 Finally, we point out a research emphasis and direction in VLC by adopting the heterogeneous network, non-orthogonal multiple access, multi-input and multi-output, full-duplex mode multiple and relays collaboration for the next generation communication network.
51314 第四代移动通信技术（4G）的长期演进技术（LTE）受国内1 785～1 805 MHz专网频段制约， The 4 th Generation Mobile Communication Technology(4 G) Long Term Evolution(LTE) is restricted by the frequency band of 1 785 ～ 1 805 MHz private network in China.
51315 轨道交通对于双网冗余配置和专门业务必须保证稳定的最低带宽要求，这使得LTE-Metro（LTE-M）综合承载系统的服务能力受到很大限制。 Rail transit must ensure stable minimum bandwidth requirements for dual network redundancy configuration and special services, which greatly limits the service capacity of LTE-M integrated bearing system.
51316 针对上述问题，文章提出了对4G基站、核心网和车载终端适配器单元（TAU）进行升级，加入第五代移动通信技术（5G）公网非独立（NSA）基站的方案， In view of the above problems, we propose to upgrade the 4 G base station, core network and vehicle mounted Terminal Adapter Unit(TAU). and add the 5 th Generation Mobile Communication Technology(5 G) public network Non-Standalone(NSA) base station.