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Joint Access Point Selection and Resource Allocation in MEC-Assisted Network:A Reinforcement Learning Based Approach

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China Communications 2022年第6期19卷 205-218页

作者： Zexu Li Chunjing Hu Wenbo Wang Yong Li guiming wei Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China China Academy of Information and Communications Technology Beijing 100191China

A distributed reinforcement learning(RL)based resource management framework is proposed for a mobile edge computing(MEC)system with both latency-sensitive and latency-insensitive services.We investigate joint optimization of both computing and radio resources to achieve efficient on-demand matches of multi-dimensional resources and diverse requirements of users.A multi-objective integer programming problem is formulated by two subproblems,i.e.,access point(AP)selection and subcarrier allocation,which can be solved jointly by our proposed distributed RL-based approach with a heuristic iteration algorithm.The proposed algorithm allows for the reduction in complexity since each user needs to consider only its own selection of AP without knowing full global information.Simulation results show that our algorithm can achieve near-optimal performance while reducing computational complexity significantly.Compared with other algorithms that only optimize either of the two sub-problems,the proposed algorithm can serve more users with much less power consumption and content delivery latency.

关键词： mobile edge computing joint resource allocation reinforcement learning

Vision, application scenarios, and key technology trends for 6G mobile communications

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Science China(Information Sciences) 2022年第5期65卷 5-31页

作者： Zhiqin WANG Ying DU Kejun wei Kaifeng HAN Xiaoyan XU guiming wei Wen TONG Peiying ZHU Jianglei MA Jun WANG Guangjian WANG Xueqiang YAN Jiying XIANG He HUANG Ruyue LI Xinhui WANG Yingmin WANG Shaohui SUN Shiqiang SUO Qiubin GAO Xin SU China Academy of Information and Communications Technology Huawei Technologies Canada Co. Ltd. Huawei Technologies Co. Ltd.(Hangzhou) Huawei Technologies Co. Ltd.(Chengdu) Huawei Technologies Co. Ltd.(Shanghai) ZTE Corporation Datang Mobile Communications Equipment Co. Ltd.

With the global commercialization of the fifth-generation(5G) network, many countries, including China, USA, European countries, Japan, and Korea, have started exploring 6G mobile communication network, following the tradition of “planning the next while commercializing one generation”. Currently,studies on 6G networks are at the infancy stage. Research on the vision and requirements for 6G is still ongoing, and the industry is yet to clarify the key enabling technologies for 6G. However, 6G will certainly build on the success of 5G. Therefore, developing high-quality 5G networks and seamlessly integrating 5G with verticals are the priorities before 2030, when 6G is projected to be commercialized. Also, global 5G standards will keep evolving to better support vertical applications. As a milestone, the Third-Generation Partnership Project(3GPP) published Release 16 in July 2020, which continuously enhanced the capabilities of mobile broadband service based on Release 15 and realized the support for low-delay and high-reliability applications, such as Internet of Vehicles and industrial Internet. Currently, 3GPP is working on Releases 17 and 18, focusing on meeting the demands of medium-and high-data-rate machine communication with low-cost and high-precision positioning, which will be published in June 2022. Thus, 6G networks will further expand the application fields and scope of the Internet of Things to accommodate those services and applications that are beyond the capabilities of 5G networks. Herein, we present our vision, application scenarios,and key technological trends for 6G networks. Furthermore, we propose several future research opportunities in 6G networks with regard to industrialization and standardization.

关键词： sixth-generation (6G) mobile communication holographic radio technology 6G vision application scenarios of 6G terahertz communication integrated sensing and communication integrated intelligence and communication ultra-massive MIMO reconfigurable intelligent surface co-frequency co-time full-duplex

Power Allocation for Video Segment Based Caching Strategy in F-RAN Architecture

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China Communications 2021年第2期18卷 215-227页

作者： Zeyu Hu Chunjing Hu Zexu Li Yong Li guimingwei Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China China Academy of Information and Communications Technology Beijing 100191China

The concept of edge network caching has been proposed to alleviate the excessive pressure on the core networks.Furthermore,video segment caching technology,a method to cut the whole video into segments and cache them separately,has brought a novel idea to solve the caching problem in the smaller space for massive data.The adoption of segment caching in edge networks will divide the simple video transmission process into two coupling stages because of separate data caching,which leads to more complicated resource allocation.In this paper,this problem is discussed,and its mathematical model is established to minimize the energy consumption of video transmissions.By introducing an efficient prediction window of channel fading,an optimal dynamic scheduling algorithm based on Qlearning is proposed to minimize power consumption while ensuring smooth video streaming.The proposed Q-learning algorithm is simulated and the impacts of channel state,target video bit rate and largescale channel parameter are evaluated.Simulation results show that the proposed method can effectively reduce the total power consumption while ensuring the smooth playback of video service,thanks to the fact that the proposed method is intelligent which can effectively utilize idle resources in favorable channel states.

关键词： radio access networks streaming media quality of service machine learning

共沉淀法合成钕掺杂ZnO纳米材料及光学性能研究

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化工新型材料 2012年第5期40卷 102-103,109页

作者：魏贵明安阳师范学院图书馆安阳455000

以硝酸锌和硝酸钕为反应原料,利用共沉淀的方法制备稀土元素钕掺杂氧化锌(ZnO)纳米材料。利用X射线衍射仪(XRD)、红外光谱仪(IR)、差热-热失重(TG-DSC)及荧光光谱仪(PL)对钕掺杂氧化锌纳米材料的晶体结构、热稳定性及发光性能进行了表... 详细信息

以硝酸锌和硝酸钕为反应原料,利用共沉淀的方法制备稀土元素钕掺杂氧化锌(ZnO)纳米材料。利用X射线衍射仪(XRD)、红外光谱仪(IR)、差热-热失重(TG-DSC)及荧光光谱仪(PL)对钕掺杂氧化锌纳米材料的晶体结构、热稳定性及发光性能进行了表征。结果表明:钕掺杂改善了氧化锌的光学性能,800℃高温处理的钕掺杂量为7%的氧化锌具有较好的发光性能。

关键词：六水合硝酸锌六水合硝酸钕氢氧化钠共沉淀掺杂发光性能

难治性强迫障碍患者认知功能和血浆C反应蛋白水平的关联

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中国心理卫生杂志 2023年第12期37卷 1031-1037页

作者：夏舜尧魏贵明石川岳伟华迟锐北京大学第六医院北京大学精神卫生研究所国家卫生健康委员会精神卫生学重点实验室(北京大学)国家精神心理疾病临床医学研究中心(北京大学第六医院)北京100083 山东省戴庄医院山东济宁272051

目的:分析难治性强迫障碍(trOCD)患者的认知功能、临床症状与血浆C-反应蛋白(CRP)水平的关系。方法:纳入55例trOCD和45例非难治强迫障碍(non-trOCD)患者及65名正常对照。采用Yale-Brown强迫量表、汉密顿抑郁量表(HAMD)、汉密顿焦虑量表(... 详细信息

目的:分析难治性强迫障碍(trOCD)患者的认知功能、临床症状与血浆C-反应蛋白(CRP)水平的关系。方法:纳入55例trOCD和45例非难治强迫障碍(non-trOCD)患者及65名正常对照。采用Yale-Brown强迫量表、汉密顿抑郁量表(HAMD)、汉密顿焦虑量表(HAMA)、MATRICS共识认知成套测验(MCCB)等评估强迫、抑郁焦虑症状和认知功能,以免疫胶乳比浊法检测被试血浆CRP水平。结果:与其他组相比,trOCD组MCCB总分及信息处理速度、工作记忆、推理及问题解决能力较低,血浆CRP水平和高CRP患者比例(≥3 mg/L)较高(均P0.05)。Logistic回归分析显示,难治性风险因素有强迫症状多(OR=2.01)、严重程度高(OR=2.29)、MCCB总分低(OR=4.01)、血浆CRP水平高(OR=4.24)、病程长(OR=3.23)(P<0.05)。结论:trOCD患者认知功能下降、血浆CRP水平升高,与强迫症状多、严重程度高和病程长关联。

关键词：难治性强迫障碍认知功能 C-反应蛋白抑郁症状焦虑症状

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基于光场统计的机场飞鸟目标检测

激光与光电子学进展 2023年第14期60卷 21-28页

作者：刘国春黄胜魏桂明郑伟李明涛中国民用航空飞行学院航空工程学院四川广汉618307 中国科学院国家空间科学中心北京100190

鸟击作为影响机场安全的主要事故征候,需要准确、稳定的弱小运动目标检测方法用于机场飞鸟检测。应用光场涨落增强低信噪比的飞鸟运动特征信号,再结合局部高斯混合模型对图像增强区域进行前景分割处理,实现宽视场复杂背景下的机场飞鸟... 详细信息

鸟击作为影响机场安全的主要事故征候,需要准确、稳定的弱小运动目标检测方法用于机场飞鸟检测。应用光场涨落增强低信噪比的飞鸟运动特征信号,再结合局部高斯混合模型对图像增强区域进行前景分割处理,实现宽视场复杂背景下的机场飞鸟目标检测,并完成不同光照条件的机场飞鸟检测实验。实验结果表明:所提算法较传统算法能有效提高机场条件下的远距离、宽视场、低信噪比弱小目标检测率,且具有较好的光学稳定性。

关键词：图像处理低信噪比光场涨落局部高斯混合模型宽视场弱小运动目标

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基于I/Q数据的5G控制信道盲检

移动通信 2022年第2期46卷 80-84页

作者：姜国凯魏贵明李雷杨业鑫中国汽车技术研究中心有限公司天津300300 中国信息通信研究院技术与标准所无线与移动研究部北京100191 电信科学技术研究院北京100191

为了研究真实环境5G下行I/Q解码流程,构建"5G核心网+5G基站+测试终端+I/Q数字采集系统"的测试环境,采集基站下行空口信号I/Q数据,并基于3GPP第15版本标准,开展5G下行控制信道PDCCH盲检流程研究,包括候选PDCCH时频域位置确定、信道估计... 详细信息

为了研究真实环境5G下行I/Q解码流程,构建"5G核心网+5G基站+测试终端+I/Q数字采集系统"的测试环境,采集基站下行空口信号I/Q数据,并基于3GPP第15版本标准,开展5G下行控制信道PDCCH盲检流程研究,包括候选PDCCH时频域位置确定、信道估计与相关检测,PDCCH比特序列解码流程(含解扰,解速率匹配,极化码译码,循环冗余校验,信息解析等环节),展示了关键层三参数、协议流程、算法原理以及PDCCH解码星座图。

关键词： 5G I/Q数据控制信道信号解码

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加强高校图书馆内涵建设的对策

科技情报开发与经济 2014年第3期24卷 86-88页

作者：魏贵明安阳师范学院图书馆河南安阳455002

高校图书馆内涵建设直接影响高校人才培养的质量、科学研究的水平、服务经济的能力及文化传承的功能,是新时期高校图书馆发展的核心内容。从高校图书馆内涵建设的原则出发,提出了加强高校图书馆内涵建设的具体措施。

关键词：高校图书馆内涵建设服务功能

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复合材料泡沫夹芯板胶接修理的压缩性能

宇航材料工艺 2020年第2期50卷 16-21页

作者：刘国春魏桂明杨文锋孙婷中国民用航空飞行学院广汉618307

针对复合材料泡沫夹芯结构在维修结构性能研究方面的缺失,在完成了复合材料泡沫夹芯板的维修与压缩性能测试之后,建立了结构有限元分析模型,结合夹芯结构的稳定性理论解析模型,并对复合材料泡沫夹芯结构的胶接修理压缩性能进行验证。结... 详细信息

针对复合材料泡沫夹芯结构在维修结构性能研究方面的缺失,在完成了复合材料泡沫夹芯板的维修与压缩性能测试之后,建立了结构有限元分析模型,结合夹芯结构的稳定性理论解析模型,并对复合材料泡沫夹芯结构的胶接修理压缩性能进行验证。结果表明:通过试验结果简化了有限元分析模型中的胶层设置;应用复合材料夹芯结构的稳定性理论解析模型,能够快速获得复合材料夹芯维修结构的侧压极限载荷上限值;复合材料泡沫夹芯修理结构的主要侧压破坏模式为面板一阶与二阶屈曲失效,该结果说明复合材料泡沫夹芯修补结构的有限元模型与解析稳定性理论模型的计算精度较高,具有较强的工程实用性。

关键词：胶接修补泡沫夹芯结构压缩性能有限元模拟理论分析