[论文解读] Scoring the Terabit/s Goal:Broadband Connectivity in 6G

Nandana Rajatheva, Italo Atzeni+27 more|arXiv (Cornell University)|Aug 17, 2020

Advanced Wireless Communication Technologies参考文献 294被引用 102

一句话总结

论文综述了6G如何通过耦合频谱、基础设施和协议使宽带达到Tbps，并讨论KPI目标和用例驱动因素及其支持的数值洞察。

ABSTRACT

This paper explores the road to vastly improving the broadband connectivity in future 6G wireless systems. Different categories of use cases are considered, with peak data rates up to 1 Tbps. Several categories of enablers at the infrastructure, spectrum, and protocol/algorithmic levels are required to realize the intended broadband connectivity goals in 6G. At the infrastructure level, we consider ultra-massive MIMO technology (possibly implemented using holographic radio), intelligent reflecting surfaces, user-centric cell-free networking, integrated access and backhaul, and integrated space and terrestrial networks. At the spectrum level, the network must seamlessly utilize sub-6 GHz bands for coverage and spatial multiplexing of many devices, while higher bands will be mainly used for pushing the peak rates of point-to-point links. Finally, at the protocol/algorithmic level, the enablers include improved coding, modulation, and waveforms to achieve lower latency, higher reliability, and reduced complexity.

研究动机与目标

• 为6G宽带连接到达1 Tbps而设定愿景并提供动机
• 识别跨频谱、基础设施与协议层的使能技术
• 通过方程与数值结果提供技术深度以支撑宽带Tbps目标
• 讨论KPI目标与用例驱动的性能需求
• 突出普及宽带接入的覆盖与社会考量

提出的方法

• 将使能技术分为频谱、基础设施与协议/算法层
• 对THz、IRS、MIMO与ML驱动的方法进行深入讨论，提供方程与数值结果
• 比较5G与6G KPI并推导Tbps级目标（表格与图示）
• 用极端回传和无小区网络分析来说明部署时的考虑
• 提供基于场景的数值示例以验证提出的概念

实验结果

研究问题

• RQ1 达到Tbps宽带目标，6G需要哪些技术与架构？
• RQ2 频谱、基础设施与协议使能因素如何协同实现6G宽带目标？
• RQ3 哪些KPI目标与用例能证明Tbps连接的合理性及其可行性？
• RQ4 如何在6G宽带中平衡覆盖、时延、可靠性与能效？

主要发现

KPI	5G	6G
Peak data rate	20 Gb/s	1 Tb/s
Experienced data rate	0.1 Gb/s	1 Gb/s
Peak spectral efficiency	30 b/s/Hz	60 b/s/Hz
Experienced spectral efficiency	0.3 b/s/Hz	3 b/s/Hz
Maximum bandwidth	1 GHz	100 GHz
Area traffic capacity	10 Mb/s/m^2	1 Gb/s/m^2
Connection density	10^6 devices/km^2	10^7 devices/km^2
Energy efficiency	Not specified	1 Tb/J
Latency	1 ms	100 μs
Reliability	1-1e-5	1-1e-9
Jitter	Not specified	1 μs
Mobility	500 km/h	1000 km/h

• 6G的目标是峰值数据速率高达1 Tbps，用户体验速率在95%的地点约1 Gb/s
• 峰值光谱效率可达60 bps/Hz，而体验式效率目标约为3 bps/Hz
• 在THz、亚THz及VL波段，带宽可达100 GHz及以上，以支持Tbps链路
• 使能技术包括超大规模MIMO、全息无线、IRS、无小区/面向用户的网络，以及集成接入/回传
• 协议进展包括新编码、调制、波形和基于ML的数据处理，以降低时延和复杂度
• 表II量化了5G vs 6G KPI的跃迁，展现Tbps尺度的目标及相关性能提升