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Concurrent streaming over heterogeneous wireless networks:technology and realization

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The Journal of China Universities of Posts and Telecommunications 2018年第5期25卷 49-59,66页

作者： zhu xiaorong Dong Tiancai Wang Yong College of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications School of Electrical Engineering Nanjing Institute of Industry Technology

Some emerging services such as augmented/virtual reality need high data rates. Whereas,the existing 2 nd generation（ 2 G）,the 3 rd generation（ 3 G） and the 4 th generation（ 4 G） networks cannot provide such high transmission rates. To meet these requirements,the technology and the realization of a‘virtual super terminal＇that can perform the concurrent streaming of video via the cooperation of multiple heterogeneous terminals are introduced. The proposed algorithm uses concurrent streaming scheduling algorithm,buffer overhead and packet delivery method,and packet loss prevention and recovery method to improve the performances of the *** measurements show that compared with the scheme without cooperative transmission the proposed design can significantly increase system throughput and decrease packet delay.

关键词： heterogeneous networks virtual terminal muhi-termlnal cooperation video streaming

A Novel Handoff Algorithm for Hierarchical Cellular Networks

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China Communications 2016年第8期13卷 136-147页

作者： xiaorong zhu Mengrong Li Wenchao Xia Hongbo zhu Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China

In this paper, we propose a novel speed and service-sensitive handoff algorithm and analytical model for hierarchical cellular ***, we use the Gauss-Markov mobility model to predict the speeds of mobile stations, and divide mobile stations into three classes based on the predicted speeds: fast, medium-speed, and ***, according to the mobility classification,network conditions, and service types, mobile stations will be handoff to the proper target networks prior to the deterioration of the currently operating channel. We further develop an analytical model to evaluate the performance of such a hierarchical system with different speed classes and service types. Simulations and analytical results show that the proposed handoff algorithm can significantly improve the network performance in terms of the handoff failure probability, unnecessary handoff probability, and network throughput, comparing with the traditional algorithms.

关键词： Hierarchical cellular networks handoff algorithm Gauss-Markov mobility model analytical model

Performance analysis and optimization model based on dynamics equation for heterogeneous wireless networks

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The Journal of China Universities of Posts and Telecommunications 2015年第3期22卷 49-55页

作者： zhu xiaorong Zhao Ya'nan Wang Yong Wireless Communication Key Lab of Jiangsu Province Nanjing University of Posts and Telecommunications National Mobile Communications Research Laboratory Southeast University Patent Information Service Institution of Jiangsu Province

In this paper, we propose a model based on dynamics equation for performance analysis and optimization for heterogeneous wireless networks （HWNs）. First, the channel occupation state with time of HWNs is modelled by dynamics equation, in which users＇ mobility as an important factor affecting system performance is considered. Then the steady state probability distribution of channel occupation is derived. Based on the results, the expression of the throughput of HWNs is deduced, which includes a factor p which is the ratio of service arrival rate accessing one of the networks to the total service arrival rate in the overlapping area. And this paper proposes to maximize the throughput of the HWNs by optimizing the factor p to efficiently utilize the resources. Simulation results show that the proposed optimization method can effectively improve the throughput and in the meanwhile decrease the blocking probability of the whole system.

关键词： heterogeneous wireless networks dynamics equation handoff rate performance analysis

Fault Diagnosis of 5G Networks Based on Digital Twin Model

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China Communications 2023年第7期20卷 175-191页

作者： xiaorong zhu Lingyu Zhao Jiaming Cao Jianhong Cai The College of Telecommunications&Information Engineering Nanjing University of Posts and TelecommunicationsJiangsu 210003China

Fault diagnosis of 5G networks faces the challenges of heavy reliance on human experience and insufficient fault samples and relevant monitoring *** digital twin technology can realize the interaction between virtual space and physical space through the fusion of model and data,providing a new paradigm for fault *** this paper,we first propose a network digital twin model and apply it to 5G network *** then use an improved Average Wasserstein GAN with Gradient Penalty(AWGAN-GP)method to discover and predict failures in the twin ***,we use XGBoost algorithm to locate the faults in physical network in real *** simulation results show that the proposed approach can significantly increase fault prediction and diagnosis accuracy in the case of a small number of labeled failure samples in 5G networks.

关键词： 5G networks fault diagnosis digital twin AWGAN-GP a small number of samples

A Novel Resource Allocation Method in Ultra-Dense Network Based on Noncooperation Game Theory

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China Communications 2016年第10期13卷 169-180页

作者： Zhen Wang xiaorong zhu Xu Bao Su Zhao Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Department of Telecommunications Engineering Jiangsu University Zhenjiang China

In ultra-dense networks(UDNs), large-scale deployment of femto base stations is an important technique for improving the network throughput and quality of service(QoS). In this paper, a multidimensional resource allocation algorithm based on noncooperation game theory is proposed to manage the resource allocation in UDNs, including transmission point association, user channels, and power. The algorithm derives a multidimensional resource optimization model and converts into a noncooperation game model according to the analysis of transmission point association user channel and power allocation. The algorithm includes two phases: transmission point association, and channel and power allocation. Then, feasible domain and discrete variables relaxation approaches are introduced to derive an approximate optimal multidimensional resource allocation solution with low complexity. Simulation results show that this method has some advantages in suppressing interference and improves the overall system throughput, while ensuring the QoS of femtocell users.

关键词： resource allocation noncooperation game theory variables relaxation

Data-flow in mobile edge computing networks: end-to-end performance analysis using stochastic network calculus

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The Journal of China Universities of Posts and Telecommunications 2022年第1期29卷 81-92页

作者： zhu xiaorong Jing Chuanfang Shi Jindou Wang Yong Ho Chifong College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationNanjing 210003China School of Electrical Engineering Nanjing Vocational University of Industry TechnologyNanjing 210003China Ultra Intelligent Technology Company Limited MacaoChina

Mobile edge computing(MEC) networks can provide a variety of services for different applications. End-to-end performance analysis of these services serves as a benchmark for the efficient planning of network resource allocation and routing strategies. In this paper, a performance analysis framework is proposed for the end-to-end data-flows in MEC networks based on stochastic network calculus(SNC). Due to the random nature of routing in MEC networks, probability parameters are introduced in the proposed analysis model to characterize this randomness into the derived expressions. Taking actual communication scenarios into consideration, the end-to-end performance of three network data-flows is analyzed, namely, voice over Internet protocol(VoIP), video, and file transfer protocol(FTP). These network data-flows adopt the preemptive priority scheduling scheme. Based on the arrival processes of these three data-flows, the effect of interference on their performances and the service capacity of each node in the MEC networks, closed-form expressions are derived for showing the relationship between delay, backlog upper bounds, and violation probability of the data-flows. Analytical and simulation results show that delay and backlog performances of the data-flows are influenced by the number of hops in the network and the random probability parameters of interference-flow(IF).

关键词： delay mobile edge computing random routing stochastic network calculus

Embryonic skeleton development and neonatal learning and memory ability of rats anesthetized with pentobarbital sodium: Differences of administration occasion and time

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Neural Regeneration Research 2006年第9期1卷 844-846页

作者： Changling Peng Yuhua zhu Ankang Hu xiaorong zhu Experimental Animal Center Xuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China Experimental Animal CenterXuzhou Medical CollegeXuzhou 221002 Jiangsu Province China

BACKGROUND: Generally speaking, anesthesia is often used in gravid body and it has been already proved that many kind of medicine can result in malformation. OBJECTIVE: To explore embryonic skeleton development and neonatal learning and memory of rats anesthetized with pentobarbital sodium in gravid rats. DESIGN: A randomized control trial. SETTING: Laboratory Animal Center of Xuzhou Medical College. MATERIALS: A total of 80 adult female SD rats, of clean grade and weighing 220-240 g, were selected in this study. The main reagents were detailed as follows: pentobarbital sodium (Shanghai Xingzhi Chemical Plant, batch number: 921019); MG-2 maze test apparatus (Zhangjiagang Biomedical Instrument Factory); somatotype microscope (Beijing Taike Instrument Co., Ltd.). METHODS: ① A total of 160 SD rats of half males and females were selected in this study. All rats were copulated. The day that the plug was checked out in the vagina next day was looked as the first day of pregnancy. Gravid rats were divided randomly into four groups, including early anesthesia group, second anesthesia group, late anesthesia group and control group with 20 in each group. Rats in the early anesthesia group were injected with 25 mg/kg soluble pentobarbitone on the 7th day of pregnancy for once; rats in the second anesthesia group were anesthetized with 25 mg/kg soluble pentobarbitone on the 7th and the 14th days of pregnancy for once; rats in the late anesthesia group were anesthetized with 25 mg/kg soluble pentobarbitone on the 14th day of pregnancy for once; rats in the control group did not treat with anything. The time of anesthetizing was controlled in 3 to 4 hours and ether was absorbed while the time was not enough. ② Half of each group was sacrificed on day 20th of pregnancy and the fetus was taken out to be stained with alizarin red S. After stained, the fetal skeleton was examined. The learning and memorizing of one-month rats that were given birth by the rest gravid rats were tested

关键词： Embryonic skeleton development and neonatal learning and memory ability of rats anesthetized with pentobarbital sodium Differences of administration occasion and time

NEAR OPTIMAL CLUSTER-HEAD SELECTION FOR WIRELESS SENSOR NETWORKS

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Journal of Electronics(China) 2007年第6期24卷 721-725页

作者： zhu xiaorong Shen Lianfeng National Mobile Comm. Research Lab Southeast University Nanjing 210096 China

Clustering in wireless sensor networks is an effective way to save energy and reuse bandwidth. To our best knowledge, most of the clustering protocols proposed in literature are of a dynamic type, where cluster heads are selected in each period, followed by cluster formation. In this paper, a new static type clustering method called Hausdorff clustering, which is based on the location of sensor nodes as well as communication efficiency and network connectivity, is proposed. The cluster head, however, is rotated within the cluster by a fuzzy logic algorithtn that optimizes the network lifetime. Simulation results show that this approach can significantly increase the lifetime of the sensor network.

关键词： Sensor networks Hausdorff clustering Fuzzy logic

Alignment technology of heavy ion medicalmachine

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Radiation Detection Technology and Methods 2019年第2期3卷 37-43页

作者： Wenjun Chen Yaqing Yang Guozhu Cai Zhiguo Cui xiaorong zhu Shaoming Wang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Huizhou Research Center of Ion Science Huizhou 516000China

Background Heavy ion medical machine(HIMM)is built by the Institute of Modern Physics,Chinese Academy of Sciences,with a high-energy beam transport line with a height of 18 m,and its complex space mounting structure increases the difficulty of installation and *** The aim of this paper is to provide methods to install all accelerator components efficiently and to ensure that the alignment accuracies of all installed components are within the designed *** We accomplished the fiducialization and pre-alignment of complex modules by combining the laser tracker and the alignment *** analyzing various elements that affect the accuracy of alignment,a method of alignment for high-energy beam transport line was proposed based on high-precision three-dimensional control *** All components have been installed and aligned in a short time,alignment position accuracy of magnets is less than 0.1 mm,and the treatment components alignment accuracy is no more than 0.4 *** On the basis of error analysis,all alignment results are better than the required precisions,and all of these guaranteed the successful operation of HIMM.

关键词： Heavy ion accelerator Three-dimensional control network Laser tracker Alignment Fiducialization