随着5G RAN 3层架构的逐渐明确,原4G时代的BBU拆分为CU和DU,其中非实时的无线高层协议栈功能引入到CU,物理层功能和实时性需求的层2功能引入到DU,部分实时性更高的物理层功能并入RRU。5G NR基站的规划正是基于新的3层架构,通过从4G到5G ...随着5G RAN 3层架构的逐渐明确,原4G时代的BBU拆分为CU和DU,其中非实时的无线高层协议栈功能引入到CU,物理层功能和实时性需求的层2功能引入到DU,部分实时性更高的物理层功能并入RRU。5G NR基站的规划正是基于新的3层架构,通过从4G到5G RAN架构的演进、CU/DU/RRU多种部署组合方式、NR基站多种部署方式资源需求、场景应用等多方面分析,论述了5G NR基站部署需要关注的问题。展开更多
Massive machine type communication(m MTC) is one of the key application scenarios for the fifth generation mobile communication(5 G). Grant-free(GF) transmission can reduce the high signaling overhead in m MTC. Non-or...Massive machine type communication(m MTC) is one of the key application scenarios for the fifth generation mobile communication(5 G). Grant-free(GF) transmission can reduce the high signaling overhead in m MTC. Non-orthogonal multiple access(NMA) can support more users for m MTC than orthogonal frequency division multiple access(OFDMA). Applying GF transmission in NMA system becomes an active topic recently. The in-depth study on applying GF transmission in pattern division multiple access(PDMA), a competitive candidate scheme of NMA, is investigated in this paper. The definition, latency and allocation of resource and transmission mechanism for GF-PDMA are discussed in detail. The link-level and system-level evaluations are provided to verify the analysis. The analysis and simulation results demonstrate that the proposed GF-PDMA has lower latency than grant based PDMA(GB-PDMA), possesses strong scalability to confront collision and provides almost 2.15 times gain over GF-OFDMA in terms of supporting the number of active users in the system.展开更多
第五代移动通信正以应对超高移动数据流量增长、超低时延数据传输和海量设备相互连接为目标加速推进标准制定和预商用进程。本文从技术背景以及需求,应用场景和标准进程,以及关键技术和业务场景等三个方面梳理了5G的发展现状和未来方向,...第五代移动通信正以应对超高移动数据流量增长、超低时延数据传输和海量设备相互连接为目标加速推进标准制定和预商用进程。本文从技术背景以及需求,应用场景和标准进程,以及关键技术和业务场景等三个方面梳理了5G的发展现状和未来方向,就4K over 5G进行了分析与展望,并介绍国网公司以全国移动多媒体交互广播电视网的建设为契机,实现网络升级、角色转换以及模式创新的策略。展开更多
A consensus has been reached that 5G network slicing technology is becoming increasingly important in EMBB,MMTC and URLLC.However,this technology still has a long way to go in education industry.By selecting four type...A consensus has been reached that 5G network slicing technology is becoming increasingly important in EMBB,MMTC and URLLC.However,this technology still has a long way to go in education industry.By selecting four types of demands in campus MMTC scenarios as specific application references,this research explores the architectural relationship between network slicing layer,intelligent terminal layer and application capability layer.Besides,emphasis has been put on the influences that virtual logic network design technology,isolation technology and standard technology has on application experiences.Under such goal,a two-dimensional route has been proposed to deploy network slicing technology based on the concept of full life cycle and the synergistic effect that AI algorithms has on slicing technology.This research is expected to nurture slicing technology,not only its technology chain,but more importantly,facilitate its value chain and large-scale vertical industry applications.展开更多
为优化对具有不同流量特征的海量机器类通信(mMTC,massive machine type communication)业务的支持,5G网络将并存两种随机接入机制:基于报文的随机接入(PBRA,packet-based random access)机制和基于连接的随机接入(CBRA,connection-base...为优化对具有不同流量特征的海量机器类通信(mMTC,massive machine type communication)业务的支持,5G网络将并存两种随机接入机制:基于报文的随机接入(PBRA,packet-based random access)机制和基于连接的随机接入(CBRA,connection-based random access)机制。然而,面向mMTC业务流量特征的随机接入机制选择问题,却尚未得到解决。为此,本文将分析PBRA机制和CBRA机制下的网络吞吐量和信令开销,解决在信令开销受限的条件下,吞吐量最大化的优化问题。以此为基础,得到了最优随机接入机制选择策略和相应的网络参数配置方案,并通过仿真进行验证。展开更多
基金supported by National High Technology Research and Development Program of China (863 Program, No. 2015AA01A709)
文摘Massive machine type communication(m MTC) is one of the key application scenarios for the fifth generation mobile communication(5 G). Grant-free(GF) transmission can reduce the high signaling overhead in m MTC. Non-orthogonal multiple access(NMA) can support more users for m MTC than orthogonal frequency division multiple access(OFDMA). Applying GF transmission in NMA system becomes an active topic recently. The in-depth study on applying GF transmission in pattern division multiple access(PDMA), a competitive candidate scheme of NMA, is investigated in this paper. The definition, latency and allocation of resource and transmission mechanism for GF-PDMA are discussed in detail. The link-level and system-level evaluations are provided to verify the analysis. The analysis and simulation results demonstrate that the proposed GF-PDMA has lower latency than grant based PDMA(GB-PDMA), possesses strong scalability to confront collision and provides almost 2.15 times gain over GF-OFDMA in terms of supporting the number of active users in the system.
文摘第五代移动通信正以应对超高移动数据流量增长、超低时延数据传输和海量设备相互连接为目标加速推进标准制定和预商用进程。本文从技术背景以及需求,应用场景和标准进程,以及关键技术和业务场景等三个方面梳理了5G的发展现状和未来方向,就4K over 5G进行了分析与展望,并介绍国网公司以全国移动多媒体交互广播电视网的建设为契机,实现网络升级、角色转换以及模式创新的策略。
基金a grant from the 2020 joint annual project of the Ministry of Education of China and China Mobile:“Research on Educational Experiments with AI”(No.MCM20200404)。
文摘A consensus has been reached that 5G network slicing technology is becoming increasingly important in EMBB,MMTC and URLLC.However,this technology still has a long way to go in education industry.By selecting four types of demands in campus MMTC scenarios as specific application references,this research explores the architectural relationship between network slicing layer,intelligent terminal layer and application capability layer.Besides,emphasis has been put on the influences that virtual logic network design technology,isolation technology and standard technology has on application experiences.Under such goal,a two-dimensional route has been proposed to deploy network slicing technology based on the concept of full life cycle and the synergistic effect that AI algorithms has on slicing technology.This research is expected to nurture slicing technology,not only its technology chain,but more importantly,facilitate its value chain and large-scale vertical industry applications.
文摘为优化对具有不同流量特征的海量机器类通信(mMTC,massive machine type communication)业务的支持,5G网络将并存两种随机接入机制:基于报文的随机接入(PBRA,packet-based random access)机制和基于连接的随机接入(CBRA,connection-based random access)机制。然而,面向mMTC业务流量特征的随机接入机制选择问题,却尚未得到解决。为此,本文将分析PBRA机制和CBRA机制下的网络吞吐量和信令开销,解决在信令开销受限的条件下,吞吐量最大化的优化问题。以此为基础,得到了最优随机接入机制选择策略和相应的网络参数配置方案,并通过仿真进行验证。
