Environmental Science, Chemical Engineering |
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Synchronous optimization of linkscheduling and timeslot assignment for industrial wireless network |
SI En bo, WANG Jing, JIN Qi bing, ZHOU Jing lin |
School of College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029,China |
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Abstract The transmission performance of wireless network was improved through static optimization with the combination of Linkscheduling and Timeslotassignment algorithms, focusing on the industrial wireless network. Linkscheduling algorithm allocated the spatial resource and Timeslotassignment algorithm distributed the temporal resource, the interaction of which impacts the transmission performance of wireless network commonly. Firstly, a multihops grading model was proposed according to the transmission performance of wireless network to build a hierarchical wireless network, through which the connections between wireless nodes were simplified. Then a scheme for synchronous optimization of Linkscheduling and Timeslotassignment was given based on the proposed model. Secondly, for the two different problems that belonged to space and time, respectively, link coloring algorithm was used to separate conflicting links for the sake of avoiding conflict data transfer in wireless network. Hierarchical coding scheme was proposed and a genetic algorithm (GA) with doublelayer encoding was put forward to connect Linkscheduling and Timeslotassignment algorithms by using implicit parallelism and combinatorial optimization, which could eliminate the interference between them. At last, a synchronous optimization strategy based on genetic algorithm was formulated and verified. Results show that the transmission performance of network sampling rate, the network delay and the network nodes load get further improvement by using optimized algorithms with synchronous strategy.
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Published: 01 June 2016
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工业无线网络链路选择与时隙分配的同步优化
以工业无线网络为研究对象,通过结合多链路路由算法和时隙调度算法静态优化无线网络的传输性能.链路选择用于优化网络的空间资源,时隙分配用于优化网络的时间资源,两者相互作用影响无线网络的传输性能.根据无线网络的传输特性给出多跳分级的无线网络模型,将分布式的工业无线网络系统层次化,减小无线网络节点之间联通的复杂性,并给出基于该模型的无线网路链路选择和时隙分配同步优化架构.针对这2个分属于空间和时间上的不同问题,采用链路染色方法进行标记,避免网路传输链路冲突问题|采用遗传算法隐并行性和组合优化解决链路选择和时隙分配的相互干扰|提出层次化的编码方案,并给出基于遗传算法双层编码方案使2类问题得以结合|给出基于遗传算法的同步优化策略并加以验证.实验结果表明:优化后的算法使得无线无线网络的采样率、数据平均延迟和节点负载性都得到进一步的提升.
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