无线资源控制(radio resource control,RRC)连接重建过程在长期演进(long term evolution,LTE)系统中对维持无线链路的可靠性,保证服务的连续性有着重要作用。对LTE系统特性和协议架构进行了介绍,对RRC连接重建过程的应用场景、发起原...无线资源控制(radio resource control,RRC)连接重建过程在长期演进(long term evolution,LTE)系统中对维持无线链路的可靠性,保证服务的连续性有着重要作用。对LTE系统特性和协议架构进行了介绍,对RRC连接重建过程的应用场景、发起原因、连接重建目的小区的选择、RRC连接参数更新等方面进行了研究;对LTE系统终端侧RRC、分组数据汇聚协议(packet data convergence protocol,PDCP)、无线链路控制(radio link control,RLC)、媒体接入控制(medium access control,MAC)子层的有限状态机和接口信号,以及RRC连接重建过程的信令流程进行了设计;通过规范和描述语言(specification and description language,SDL)/树表结合表示法(tree and tabular combinednotation,TTCN)仿真测试平台验证了RRC连接重建过程的设计与实现符合第三代合作伙伴计划(3rd generation partnership project,3GPP)协议规范。展开更多
We review and summarize the applications of the Grad-Shafranov(GS) reconstruction technique to space plasma structures in the Earth's magnetosphere and in the interplanetary space. We organize our presentations fo...We review and summarize the applications of the Grad-Shafranov(GS) reconstruction technique to space plasma structures in the Earth's magnetosphere and in the interplanetary space. We organize our presentations following the branches of the "academic family tree" rooted on Prof. Bengt U. ? Sonnerup, the inventor of the GS method. Special attentions are paid to validations of the GS reconstruction results via(1) the direct validation by co-spatial in-situ measurements among multiple spacecraft, and(2) indirect validation by implications and interpretations of the physical connection between the structures reconstructed and other related processes. For the latter, the inter-comparison and interconnection between the large-scale magnetic flux ropes(i.e., Magnetic Clouds) in the solar wind and their solar source properties are presented. In addition, we also summarize various GS-type(or-like) reconstruction and an extension of the GS technique to toroidal geometry. In particular,we point to a possible advancement with added complexity of "helical symmetry" and mixed helicity, in the hope of stimulating interest in future development. We close by offering some thoughts on appreciating the scientific merit of GS reconstruction in general.展开更多
文摘无线资源控制(radio resource control,RRC)连接重建过程在长期演进(long term evolution,LTE)系统中对维持无线链路的可靠性,保证服务的连续性有着重要作用。对LTE系统特性和协议架构进行了介绍,对RRC连接重建过程的应用场景、发起原因、连接重建目的小区的选择、RRC连接参数更新等方面进行了研究;对LTE系统终端侧RRC、分组数据汇聚协议(packet data convergence protocol,PDCP)、无线链路控制(radio link control,RLC)、媒体接入控制(medium access control,MAC)子层的有限状态机和接口信号,以及RRC连接重建过程的信令流程进行了设计;通过规范和描述语言(specification and description language,SDL)/树表结合表示法(tree and tabular combinednotation,TTCN)仿真测试平台验证了RRC连接重建过程的设计与实现符合第三代合作伙伴计划(3rd generation partnership project,3GPP)协议规范。
基金supported by National Aeronautics and Space Administration (NASA) and National Science Foundation (NSF) (Grants Nos. AGS-1062050, NNG04GF47G, NNG06GD41G, NNX12AF97G, NNX12AH50G, NNH13ZDA001N, and NNX14AF41G)
文摘We review and summarize the applications of the Grad-Shafranov(GS) reconstruction technique to space plasma structures in the Earth's magnetosphere and in the interplanetary space. We organize our presentations following the branches of the "academic family tree" rooted on Prof. Bengt U. ? Sonnerup, the inventor of the GS method. Special attentions are paid to validations of the GS reconstruction results via(1) the direct validation by co-spatial in-situ measurements among multiple spacecraft, and(2) indirect validation by implications and interpretations of the physical connection between the structures reconstructed and other related processes. For the latter, the inter-comparison and interconnection between the large-scale magnetic flux ropes(i.e., Magnetic Clouds) in the solar wind and their solar source properties are presented. In addition, we also summarize various GS-type(or-like) reconstruction and an extension of the GS technique to toroidal geometry. In particular,we point to a possible advancement with added complexity of "helical symmetry" and mixed helicity, in the hope of stimulating interest in future development. We close by offering some thoughts on appreciating the scientific merit of GS reconstruction in general.
