The key technologies involved in the evolution of the Cloud-based Radio Access Network(C-RAN) are discussed in this paper. Taking the Frameless Network Architecture(FNA) as a starting point, a cell-lessbased network t...The key technologies involved in the evolution of the Cloud-based Radio Access Network(C-RAN) are discussed in this paper. Taking the Frameless Network Architecture(FNA) as a starting point, a cell-lessbased network topology for a multi-tier Heterogeneous Network(Het Net) and ultra-dense network is proposed. The FNA network topology modeling is researched with centralized processing and distributed antenna deployments. The Antenna Element(AE) is released as a new dimensional radio resource that is included in the centralized Radio Resource Management(RRM) processes. This contributes to the on-demand user-centric serving-set associations with cell-edge effect elimination. The Control Plane(CP) and User Plane(UP) separation and adaptation are introduced for energy efficiency improvements. The centralized RRM and different optimization goals are discussed for fully exploring the merits from the centralized computing of C-RAN. Considering the complexity, near-optimal approaches for specific users' Quality-of-Service(Qo S) requirements are addressed. Finally, based on the research highlighted above, the way forward of C-RAN evolution is discussed.展开更多
目的:开发一种.NET环境下的基于客户端/服务器(Client/Server,C/S)结构的医院信息系统(hospital information system,HIS)架构,使HIS中的不同功能模块可以方便地加载到该架构中,以提高HIS开发的效率,降低开发成本。方法:对HIS架构进行...目的:开发一种.NET环境下的基于客户端/服务器(Client/Server,C/S)结构的医院信息系统(hospital information system,HIS)架构,使HIS中的不同功能模块可以方便地加载到该架构中,以提高HIS开发的效率,降低开发成本。方法:对HIS架构进行分层结构化设计,分别为界面层、逻辑层、数据访问层和实体层。用户通过界面层输入数据,由逻辑层响应界面层的用户请求,最后由数据层响应逻辑层的请求进行数据库的访问操作。实体层是数据的载体,界面层、逻辑层、数据访问层通过实体层传递数据。利用Visual Studio 2008中的C#语言完成架构程序的开发。结果:利用该架构,可以方便地对HIS中的各个功能模块进行加载,大大方便了开发人员对程序功能的控制。结论:基于C/S结构的分布式HIS架构满足了医护人员和管理人员对软件的要求,提高了HIS开发的效率,同时降低了系统开发的成本。展开更多
基金supported by the National High Technology Research and Development Program of China No.2014AA01A701Nature and Science Foundation of China under Grants No.61471068,61421061+2 种基金Beijing Nova Programme No.Z131101000413030International Collaboration Project No.2015DFT10160National Major Project No.2016ZX03001009-003
文摘The key technologies involved in the evolution of the Cloud-based Radio Access Network(C-RAN) are discussed in this paper. Taking the Frameless Network Architecture(FNA) as a starting point, a cell-lessbased network topology for a multi-tier Heterogeneous Network(Het Net) and ultra-dense network is proposed. The FNA network topology modeling is researched with centralized processing and distributed antenna deployments. The Antenna Element(AE) is released as a new dimensional radio resource that is included in the centralized Radio Resource Management(RRM) processes. This contributes to the on-demand user-centric serving-set associations with cell-edge effect elimination. The Control Plane(CP) and User Plane(UP) separation and adaptation are introduced for energy efficiency improvements. The centralized RRM and different optimization goals are discussed for fully exploring the merits from the centralized computing of C-RAN. Considering the complexity, near-optimal approaches for specific users' Quality-of-Service(Qo S) requirements are addressed. Finally, based on the research highlighted above, the way forward of C-RAN evolution is discussed.
文摘目的:开发一种.NET环境下的基于客户端/服务器(Client/Server,C/S)结构的医院信息系统(hospital information system,HIS)架构,使HIS中的不同功能模块可以方便地加载到该架构中,以提高HIS开发的效率,降低开发成本。方法:对HIS架构进行分层结构化设计,分别为界面层、逻辑层、数据访问层和实体层。用户通过界面层输入数据,由逻辑层响应界面层的用户请求,最后由数据层响应逻辑层的请求进行数据库的访问操作。实体层是数据的载体,界面层、逻辑层、数据访问层通过实体层传递数据。利用Visual Studio 2008中的C#语言完成架构程序的开发。结果:利用该架构,可以方便地对HIS中的各个功能模块进行加载,大大方便了开发人员对程序功能的控制。结论:基于C/S结构的分布式HIS架构满足了医护人员和管理人员对软件的要求,提高了HIS开发的效率,同时降低了系统开发的成本。
