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6 results on '"Zhao, Danping"'

1. Resource Virtualization in OFDMA Wireless Mesh Network for Emergency Communications

Author

Liu Huan, Zhao Danping, Lu Xiaofeng, Fan Sihan, and Bowen Liu

Subjects
Wireless mesh network, Computer science, business.industry, Quality of service, Orthogonal frequency-division multiple access, 05 social sciences, 050801 communication & media studies, Provisioning, Load balancing (computing), Resource virtualization, 0508 media and communications, Software deployment, 0502 economics and business, Resource allocation, 050211 marketing, business, Computer network
Abstract

Wireless mesh network (WMN), also known as the multi-hop network, has a huge application prospect in emergency communications with numerous advantages such as easy deployment and diverse structure. This paper focuses on the research of resource virtualization in orthogonal frequency division multiple access (OFDMA) WMN, where a model of virtual request multi-path access scheme is proposed. Furthermore, the virtual link rates are scheduled to different slices with delay-bounded quality of service (QoS) provisioning for delay-sensitive traffic flows. In addition, the system model is divided into two sub-problems, including physical resource allocation based on the principle of proportional fairness and virtual link multi-path mapping based on load balancing. Finally, a two-layer dynamic interaction algorithm is proposed to solve the original problem to meet the optimization target. Simulation results demonstrate the effectiveness and stability of the algorithm.

Published
2019

3. Resource Virtualization for Customized Delay- Bounded QoS Provisioning in Uplink VMIMO-SC-FDMA Systems.

Author

Lu, Xiaofeng, Ni, Qiang, Zhao, Danping, Cheng, Wenchi, and Zhang, Hailin

Subjects
WIRELESS sensor networks, VIRTUAL machine systems, QUALITY of service, BANDWIDTH allocation, RESOURCE allocation
Abstract

Wireless network virtualization, which decouples the physical supply process and the service provisioning process, can abstract, isolate, and share the physical infrastructure network equipment. This paper studies the resource virtualization in virtual multiple-input multiple-output single-carrier frequency-division-multiple-access uplink systems, where resources are abstracted to hide the complex details of the fading channel and the link rates are virtualized using the statistical method. Furthermore, the virtual link rates are scheduled and instantiated to different slices with customized delay-bounded quality of service (QoS) provisioning. In this scheme, a physical mobile network operator (PMNO) is in charge of the network resource at the physical layer, while virtual mobile network operators (VMNOs) are responsible for the traffic admission and the slice management at the MAC layer. Furthermore, we build up the resource virtualization problem as a cross-layer Stackelberg game, which has the interactive dual processes based on the QoS exponent: top-to-down sub-game of leaders at the MAC layer and down-to-top sub-game of follower at the physical layer. Using the newly designed functions for PMNO and VMNOs, we develop an effective dynamic algorithm with an iterative dual update to meet the optimization targets of PMNO and VMNOs. Simulation results verify the superiority and stability of delay-bounded QoS guaranteed wireless resource virtualization algorithm developed in this paper in terms of convergence, access rate, and delay-outage probability. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Based on the simulation for ideal injection rate and study for its influence

Author

Du Xin, Fan Hai Kuan, Zhao Danping, and Wu Shuangqun

Subjects
Plunger, Engineering, business.industry, Mechanical engineering, Injection rate, Injector, Fuel injection, Combustion, Automotive engineering, law.invention, Lift (force), Piston, law, business, MATLAB, computer, computer.programming_language
Abstract

Ideal injection rate has greater influence on improve diesel combustion process and its performance. In order to realize the ideal boot-type injection rate, the paper founds mathematics model for the diesel injection system electric controlled injector, The application of MATLAB/SIMULINK software had simulation study and be got desired the desired ideal boots-type fuel injection rate. Meanwhile, analysis the injector main structure parameters on the fuel injection law influence, the effects of some important structural parameters of injector are analyzed. Results show that the main parameters of maximum plunger lift and speed, needle pre-lift, control piston diameter, boot-type valve fluid-release area and outside diameter has influence on the injection rate. The results for diesel injection system research and design provide the reference.

Published
2011

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