热点论文带您领略5G/6G的最新技术动向 ——图书馆前沿文献专题推荐服务（18）

2020-07-09

 

在上一期前沿文献中推荐的几篇文章聚焦于5G和6G网络的技术演进，以及6G时代面临的机遇和挑战等。本期推荐中选取了4篇文献，继续从6G的新技术方向出发，讨论的内容包括6G的网络形态，6G网络的智能化演进，编码技术的发展，以及毫秒级通信交互和极高可靠性的 in-X子网等方向，选取了最新的研究文献，推送给相关领域的科研人员，共同探讨。

 

Ubiquitous-X:构建未来6G网络

张平，等

中国科学:信息科学,2020,50(6): 913-930

本文从移动通信演进规律和泛在性出发,研究第六代移动通信系统(sixth generation, 6G).在前期引入代表智慧或意识的"灵"的基础上,提出6G信息交换中枢Ubiquitous-X网络,使人–机–物–灵的新通信对象全面协作和融合于现有网络,以构建未来的6G网络.针对Ubiquitous-X网络构架面临的信息密度非均匀增长导致的传播非线性、信息维度增加导致的信息空间高维性、承载服务差异化导致的信息处理复杂性3大挑战,借鉴复杂系统耗散理论和信息负熵促进有序的思想,给出设计与优化Ubiquitous-X网络的演进范式和核心技术,为6G研究提供参考.

 

Exploring the road to 6G: ABC — foundation for intelligent mobile networks

Jinkang Zhu, etc.

China Communications,2020,17(6): 51 - 67

The 5th generation (5G) mobile networks has been put into services across a number of markets, which aims at providing subscribers with high bit rates, low latency, high capacity, many new services and vertical applications. Therefore the research and development on 6G have been put on the agenda. Regarding demands and characteristics of future 6G, artificial intelligence (A), big data (B) and cloud computing (C) will play indispensable roles in achieving the highest efficiency and the largest benefits. Interestingly, the initials of these three aspects remind us the significance of vitamin ABC to human body. In this article we specifically expound on the three elements of ABC and relationships in between. We analyze the basic characteristics of wireless big data (WBD) and the corresponding technical action in A and C, which are the high dimensional feature and spatial separation, the predictive ability, and the characteristics of knowledge. Based on the abilities of WBD, a new learning approach for wireless AI called knowledge + data-driven deep learning (KD-DL) method, and a layered computing architecture of mobile network integrating cloud/edge/terminal computing, is proposed, and their achievable efficiency is discussed. These progress will be conducive to the development of future 6G.

 

Transform Domain Precoding (TDP) for 5G Evolution and 6G

Wenjia LIU, etc

IEEE Signal Processing Letters, 2020: 1-5

Due to the availability of wide bandwidth, high frequency band is promising for 5G evolution and 6G. With the increase of antenna ports and bandwidth, existing subband-level precoding consumes high feedback overhead and restricts the precoding granularity. However, channel sparsity can be observed in transformed angular-delay domain in mmWave systems with massive antennas. In this letter, to utilize the sparsity, we propose a transform domain precoding (TDP) to design precoder and feedback. Realistic factors including hybrid beamforming, frequency domain windowing and power allocation are analyzed and evaluated by link-level simulations. Results show that 60%~89% overhead reduction and 2.38%~21% spectrum efficiency (SE) enhancement can be achieved by TDP.

 

Towards 6G in-X Subnetworks With Sub-Millisecond Communication Cycles and Extreme Reliability

Ramoni Adeogun, etc.

IEEE Access,2020,8:110172 - 110188

The continuous proliferation of applications requiring wireless connectivity will eventually result in latency and reliability requirements beyond what is achievable with current technologies. Such applications can for example include industrial control at the sensor-actuator level, intra-vehicle communication, fast closed loop control in intra-body networks and intra-avionics communication. In this article, we present the design of short range Wireless Isochronous Real Time (WIRT) in-X subnetworks aimed at life-critical applications with communication cycles shorter than 0.1 ms and outage probability below 10 −6 . Such targets are clearly beyond what is supported by the 5th Generation (5G) radio technology, and position WIRT as a possible 6th Generation (6G) system. WIRT subnetworks are envisioned to be deployed for instance in industrial production modules, robots, or inside vehicles. We identify technology components as well as spectrum bands for WIRT subnetworks and present major design aspects including frame structure and transmission techniques. The performance evaluation considering a dense scenario with up to 2 devices per m 2 reveal that a multi-GHz spectrum may be required for ensuring high spatial service availability. The possibility of running WIRT as an ultra-wideband underlay system in the centimeter-wave spectrum region is also discussed. Aspects related to design of techniques for the control plane as well as enhancements to the presented design is the focus of our ongoing research.