Ultradense Cell-Free Massive MIMO for 6G: Technical Overview and Open Questions

IF 23.2 1区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Proceedings of the IEEE Pub Date : 2024-03-08 DOI:10.1109/JPROC.2024.3393514

Hien Quoc Ngo;Giovanni Interdonato;Erik G. Larsson;Giuseppe Caire;Jeffrey G. Andrews

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引用次数: 0

Abstract

Ultradense cell-free massive multiple-input–multiple-output (CF-MMIMO) has emerged as a promising technology expected to meet the future ubiquitous connectivity requirements and ever-growing data traffic demands in sixth generation (6G). This article provides a contemporary overview of ultradense CF-MMIMO networks and addresses important unresolved questions on their future deployment. We first present a comprehensive survey of state-of-the-art research on CF-MMIMO and ultradense networks. Then, we discuss the key challenges of CF-MMIMO under ultradense scenarios such as low-complexity architecture and processing, low-complexity/scalable resource allocation, fronthaul limitation, massive access, synchronization, and channel acquisition. Finally, we answer key open questions, considering different design comparisons and discussing suitable methods dealing with the key challenges of ultradense CF-MMIMO. The discussion aims to provide a valuable roadmap for interesting future research directions in this area, facilitating the development of CF-MMIMO for 6G.

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用于 6G 的超密集无小区大规模 MIMO：技术概述和开放性问题

超密集无蜂窝大规模多输入多输出（CF-MMIMO）已成为一种前景广阔的技术，有望满足未来无处不在的连接要求和第六代（6G）日益增长的数据流量需求。本文概述了超密集 CF-MMIMO 网络的发展现状，并探讨了其未来部署中尚未解决的重要问题。首先，我们对 CF-MMIMO 和超密集网络的最新研究进行了全面梳理。然后，我们讨论了 CF-MMIMO 在超密集场景下面临的关键挑战，如低复杂度架构和处理、低复杂度/可扩展资源分配、前传限制、大规模接入、同步和信道获取。最后，我们回答了关键的开放问题，考虑了不同的设计比较，并讨论了应对超密集 CF-MMIMO 关键挑战的合适方法。讨论旨在为这一领域有趣的未来研究方向提供有价值的路线图，促进 6G CF-MMIMO 的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the IEEE 工程技术-工程：电子与电气

CiteScore

46.40

自引率

1.00%

发文量

160

审稿时长

3-8 weeks

期刊介绍： Proceedings of the IEEE is the leading journal to provide in-depth review, survey, and tutorial coverage of the technical developments in electronics, electrical and computer engineering, and computer science. Consistently ranked as one of the top journals by Impact Factor, Article Influence Score and more, the journal serves as a trusted resource for engineers around the world.