Key Enabling Technologies for the Post-5G Era: Fully Adaptive, All-Spectra Coordinated Radio Access Network with Function Decoupling
Key Enabling Technologies for the Post-5G Era: Fully Adaptive, All-Spectra Coordinated Radio Access Network with Function Decoupling
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DOI：
10.1109/mcom.001.2000186
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发表时间：
2020-09-01
影响因子：
11.2
通讯作者：
Chang, Gee-Kung
中科院分区：
文献类型：
--
作者：
Chen, You-Wei;Zhang, Rui;Chang, Gee-Kung
随着无线应用带宽需求的快速增长，后5G相关的新系统技术不断涌现。在本文中，报告并讨论了一种全频谱完全自适应和协调的无线接入网络（RAN）。通过采用光纤无线集成和网络架构，所有数据承载通道都可以聚合在同一个光纤接入基础设施中。这使得能够实现具有功能解耦的协调 RAN，其中采用较低的 RF、5G 新无线电 (NR)、亚太赫兹甚至光波；此外，还根据物理层属性提供不同类型的服务。讨论了有前景的场景，例如通过可见光通信 (VLC) 实现无线 NR 自由空间光 (FSO) 回程和室内系统的集成接入，以及 VLC 定位系统辅助的高效 NR 波束成形。前一种用例可以提高网络吞吐量和可靠性。这是因为FSO和NR都因其丰富的带宽而可以支持高信道容量。同时，随着新型DSP技术的进步，可以增强NR-FSO链路在各种天气湍流或遭受突发模式干扰下的稳定性。后一种情况通过 VLC 辅助定位系统为高速数据链路和简化的波束管理提供了替代解决方案。 VLC可以同时提供无处不在的室内照明、数据传输和定位。借助人工智能算法，基于VLC的精密定位系统可以提供小于1厘米的定位精度，并且能够满足3D模型中NR波束形成器的窄波束尺寸。因此，可以预见，全频谱功能解耦的RAN可以作为统一的网络平台来支持所有无线应用，同时优化后5G移动数据网络的系统吞吐量、信道条件、网络覆盖和软硬件复杂性。
With the rapidly growing bandwidth demand for wireless applications, new system technologies related to post-5G are emerging. In this article, an all-spectra fully adaptive and coordinated radio access network (RAN) is reported and discussed. By employing a fiber-wireless integration and networking architecture, all data-carrying channels could be aggregated in the same fiber access infrastructure. This enables a coordinated RAN with function decoupling, in which lower RF, 5G New Radio (NR), sub-THz, and even lightwave are employed; also, different types of services are delivered depending on their physical layer properties. Promising scenarios are discussed, such as integrated access of wireless NR-free space optical (FSO) backhauling and indoor systems via visible light communication (VLC) and efficient NR beamforming aided by VLC positioning system. The former use case can enhance the network throughput and reliability. This is because both FSO and NR can support high channel capacity due to their abundant bandwidth. Meanwhile, with the advancement of novel DSP techniques, the stability of the NR-FSO link under diverse weather turbulences or suffering from burst mode interference can be enhanced. The latter scenario provides an alternative solution for high-speed data link and a simplified beam management via the VLC-aided positioning system. VLC can concurrently provide ubiquitous indoor illumination, data transmission, and positioning. With the help of artificial intelligence algorithms, a VLC-based precision positioning system can provide a location accuracy of less than 1 cm, and it is able to meet the narrow beam size of the NR beamformer in a 3D model. Therefore, it is foreseeable that an all-spectra function decoupled RAN can serve as a unified network platform to support all wireless applications while optimizing system throughput, channel condition, network coverage, and software/ hardware complexity for post-5G mobile data networks.