密集异构云无线接入网中的协同传输理论及关键技术

Hyper-dense heterogeneous networking is the road toward future radio access networks. Meanwhile, advanced cloud computing techniques will enable the virtualization and on-demand allocation of wireless resources, thus enabling the potent collaborative transmissions among densely deployed heterogeneous radio access points (APs) and users. The project aims to study the core theory and key techniques to achieve the hyper-dense, high spectral efficiency and high energy efficiency (H3) collaborative transmission in the heterogeneous cloud radio access networks (H-CRAN). The main targets of the project are listed as follows. (1) Collaborative sparse channel estimation, compression and transmission technology will be investigated under the framework of H-CRAN, which will enable the scheduling of APs/users and also facilitate the multi-dimension beamforming in H-CRAN. (2) Ensuring the quality of experience (QoE), the spectral efficiency and energy efficiency will be well modeled and analyzed, based on which effective scheduling of APs/users will be proposed to support the collaborative transmission in H-CRAN. (3) Subjecting to many practical scenarios, e.g., the capacity of backhaul, schemes of multi-dimension collaborative beamforming optimization will be proposed, which will fulfil the goal of H3 collaborative transmission in H-CRAN. The project leverages hyper-densely deployed APs and cloud computing empowered resource management, proposes innovative collaborative transmission theory and techniques, and can significantly advance the physical-layer solution towards a smart H-CRAN for future wireless communications.

未来无线接入网络将呈现密集异构组网的态势，而云计算技术将有助实现无线资源虚拟化与按需分配，从而发挥密集异构接入节点协同传输的巨大潜力。本项目主要研究密集异构云无线接入网中支持高密度、高谱效和高能效的“三高”协同传输理论及关键技术。主要内容包括：（1）研究适用于异构云无线接入网的协同稀疏信道估计和压缩传输技术，为该网络中接入节点/用户调度及多维协同波束成形设计奠定基础；（2）确保用户体验质量的条件下，对异构云无线接入网的系统频谱效率、能量效率进行抽象建模并进行分析，设计高效的接入节点/用户调度方案来支持网络协同传输；（3）综合考虑云端回程链路容量等实际约束，设计多维协同波束成型优化方法，实现动态、灵活的“三高”协同信息传输。本研究充分利用了密集部署的异构接入节点和基于云的高效资源管理，提出了新的协同传输理论和方法，为智能化的异构云无线接入供了先进的物理层解决方案。

未来无线接入网络呈现密集异构组网的态势，而云计算技术有助于实现无线资源虚拟化与按需分配，从而发挥密集异构接入节点协同传输的巨大潜力。本项目主要研究了密集异构云无线接入网中支持高密度、高谱效和高能效的“三高”协同传输理论及关键技术。主要成果包括：（1）提出了针对大规模超密集异构网络系统中基于能效的资源分配算法。（2）提出了最大化安全速率的联合波束成形和功率分配方法。（3）提出了大规模超密集异构网络中的安全无线信息传输的方案。本项目的研究成果主要发表在国内外著名的权威通信学术期刊及国际通信旗舰会议上，其中SCI检索文章37篇，EI检索文章45篇，同时出版学术专著1部，申请/授权发明专利5项。培养博士研究生6名，硕士研究生6名。本项目已经高质量地完成了所有的预期成果。本项目可以有效促进异构云无线接入网有关理论和技术的发展，研究成果有望成为未来移动通信系统的核心关键技术。