时空一致性的无线接入网络架构与关键技术研究

The rapid increase of mobile data in the past years has consumed most of the network capacity, making the network hard to satisfy the customers’ data rate requirements. The aforementioned phenomenon is induced by two reasons. The first reason is that the deterministic network capability cannot well satisfy the customers’ dynamic and uncertain requirements in both time and spatial domains. The other reason comes from the fact that the speed of network capacity improvement is far below that of the increase in network data. The fundamental method for solving the aforementioned problems is to optimize the architecture of wireless access network in order to eliminate the consequence brought about by the time-space inconsistency in the network services, making the network be capable of adapting to the dynamic and uncertain services. Furthermore, the potential of communication and computation in intelligent devices should also be considerably exploited to further optimize the network resource utilization and reduce the burden at the base station simultaneously. Finally, the critical problem in full-duplex communications should also be solved to doubling the spectral efficiency as compared to that in half-duplex mode. In this project, we will propose a new architecture for the future wireless access network, with breakthrough in the critical technologies being achieved. We will mainly focus on the theories and technologies of base station virtualization, cooperation among terminals, and self-interference cancellation in full-duplex communication systems. Furthermore, we will also build the platform of experimental verification for the proposed algorithms. The research results will also provide fundamental theories and critical technologies for optimizing the future wireless access network architecture.

随着移动数据业务的快速增长，网络的服务能力瓶颈日趋凸显，其根源在于无线网络发展面临两大矛盾，即：“确定性的网络服务能力与时空动态性、不均匀性的用户通信需求之间的矛盾”与“网络容量增长速度远低于业务量增长速度所带来的矛盾”。解决上述矛盾的根本途径在于优化网络架构、消除网络服务时空不一致性所带来的严重后果，使之更好地适应移动业务在时间与空间两个维度上的动态性与不均匀性。其次，充分发掘智能终端的通信与计算能力，是缓解基站压力、提高网络资源利用率的重要手段。再次，突破半双工模式的瓶颈、解决全双工通信核心难题，是实现网络容量倍增的有效手段。本项目将提出具有时空一致性的无线接入网络架构并突破关键技术，重点研究基站虚拟化、终端设备深度协同、全双工自干扰消除与中继选择等关键理论与前沿技术，并搭建实验验证平台。研究成果将为推动我国未来无线接入网络架构的优化以及关键设备的研发提供理论基础与技术支持。

本项目面向第五代移动通信网络大容量、超密集、高谱效等发展趋势，研究未来无线接入网络架构与关键技术，致力于在基站虚拟化理论与超级基站架构、无线全双工通信基础理论与关键技术、无线网络协同调控技术等方面形成突破。取得成果如下：①研究基站资源虚拟化与自适应管理技术，突破全局资源智能管控技术瓶颈，实现了高效的资源统计复用，提高了系统的能效和容量；②研究无线全双工通信系统自干扰消除理论与技术，重点突破非线性自干扰消除瓶颈，获得了三级级联架构下110dB的自干扰消除能力；③研究基于生物群智行为的无线网络资源优化理论与技术，提出了时变拓扑下网络资源自组织协同调控方法，突破了因多跳路由不稳定所引发的网络运行效率瓶颈；面向无线自组织网络提出了“类鸟群”分簇群移算法，实现了无线自组织节点之间的灵活组网与协同通信，显著提升了网络能量效率与资源效用。成果发表论文72篇，3篇ESI高被引，单篇论文SCI他引184次；已获授权18项专利，包括1项美国专利。成果能够优化无线接入网络架构，显著提高无线网络频谱效率与资源效用，获得了实际应用并产生了显著的经济与社会效益：①典型成果已在我国某车载型用频设备列装87套；②成果应用于某星载设备，解决了该设备无源互调干扰消除难题。