Rate-splitting multiple access (RSMA) has emerged as a novel, general, and powerful framework for the design and optimization of non-orthogonal transmission, multiple access (MA), and interference management strategies for future wireless networks. Through information and communication theoretic analysis, RSMA has been shown to be optimal (from a Degrees-of-Freedom region perspective) in several transmission scenarios. Compared to the conventional MA strategies used in 5G, RSMA enables spectral efficiency (SE), energy efficiency (EE), coverage, user fairness, reliability, and quality of service (QoS) enhancements for a wide range of network loads (including both underloaded and overloaded regimes) and user channel conditions. Furthermore, it enjoys a higher robustness against imperfect channel state information at the transmitter (CSIT) and entails lower feedback overhead and complexity. Despite its great potential to fundamentally change the physical (PHY) layer and media access control (MAC) layer of wireless communication networks, RSMA is still confronted with many challenges on the road towards standardization. In this paper, we present the first comprehensive overview on RSMA by providing a survey of the pertinent state-of-the-art research, detailing its architecture, taxonomy, and various appealing applications, as well as comparing with existing MA schemes in terms of their overall frameworks, performance, and complexities. An in-depth discussion of future RSMA research challenges is also provided to inspire future research on RSMA-aided wireless communication for beyond 5G systems.
翻译:分速多重接入(RSMA)已成为设计和优化非横向传输、多重接入(MA)和干扰管理未来无线网络战略的新颖、一般和有力的框架,通过信息和通信理论分析,RSMA在若干传输情景中被证明是最佳的(从自由程度区域角度),与5G使用的常规MA战略相比,RSMA使光谱效率、能源效率(EE)、覆盖面、用户公平、可靠性和服务质量(QOS)得到加强,用于设计和优化广泛的网络负荷(包括负荷不足和超载的制度)和用户频道条件。此外,RSMA在对发报机(CSIT)不完善的频道国家信息方面,具有更强的活力,并带来较低的反馈间接费用和复杂性。尽管它极有可能从根本上改变无线通信网络的物理(PHY)层和媒体接入控制层,但RSMA仍面临着通往标准化的道路上的许多挑战。在本文件中,我们首次全面概述RSMA,对相关州级系统(包括超载和超载系统)以及用户频道系统(包括超载系统)的系统进行一项调查,并详细介绍其未来研究框架的准确性分析。