1、1EvolvedRandomAccessandMultipleAccessTransmission TechnologiesWhite Paper2021.12.212摘要摘要6G 将通过万物互联/智联真正全面实现数字化社会。面向 6G 的多项关键技术研究工作正在开展中，作为空口增强的核心技术点，多址接入技术是 6G 研究热点之一。多址接入技术包括随机接入技术和多址传输技术。随机接入技术和多址传输技术分别服务于无线通信中的初始接入过程和数据传输过程，在 6G 系统中都将进一步演进，甚至融合形成新型的多址接入技术。面向多址接入技术及其演进，这本白皮书将分析多个 6G 中可能出现的新应用场景，将分

2、析多址接入技术的基础理论进展。基于上述 6G 新场景和多址接入新理论，为了满足 6G 多元化的性能指标，包括提升多址接入的终端数量、提高接入和传输的效率、降低终端的功耗、降低通信的时延等，这本白皮书将着重研究以下演进的多址接入技术：分析现有初始接入过程的限制性因素，基于 4-Step RACH 技术、2-StepRACH 技术等，研究演进的随机接入技术；分析现有数据传输过程的限制性因素，基于 OFDMA 技术、NOMA 技术等，研究演进的多址传输技术；把初始接入过程和数据传输过程进行融合，研究随机接入技术和多址传输技术的新型融合技术。目前 6G 研究仍在探索之中，6G 系统将会拥有新资源、新能

3、力，这本白皮书的主要思路，是基于经典的通信系统设计思想，对 6G 系统开展基础性研究，探索提升 6G 系统通信能力的关键技术。我们希望这种思路和这本白皮书能对 6G研究和 6G 产业有所贡献。3Executive Summary6G will truly and comprehensively realize a digital society through the Internet ofeverything or intelligent connection of everything.A number of 6G-oriented key technologyresearch work

4、is ongoing.As the core technology point of air interface enhancement,randomaccess and multiple access transmission technology is one of the 6G research hotspots.For random access and multiple access transmission technology,random accesstechnology and multiple access transmission technology serve the

5、 initial access process anddata transmission process in wireless communication respectively.They will further evolveand even integrate into a new random access and multiple access transmission technology in6G system.For random access and multiple access transmission technology and its evolution,this

6、white paper will analyze multiple new application scenarios that may appear in 6G,and willanalyze the basic theory progress.Based on the above-mentioned new 6G scenarios and thenew theory progress,in order to meet the diversified key performance indicators of 6G,including increasing the number of te