基于时空特性的VLC/RF网络决策机制
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吉林化工学院

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TN92

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吉林省教育厅科学研究项目(JJKH20220243KJ)


Decision-making mechanism for VLC/RF networks based on spatio-temporal characteristics
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Jilin Institute of Chemical Technology

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    摘要:

    针对室内可见光通信 (Visible Light Communication, VLC) 与射频 (Radio Frequency, RF) 通信异构网络中易因瞬态链路变化而导致频繁切换的问题,本文提出了一种基于时空特性的 VLC/RF 网络决策机制。首先,在离线采样阶段,通过对室内网格点的空间位置、带宽、接收信号强度、时延与信噪比等特征数据,在控制器中对特征数据进行处理并转换成比例权重,构建数据库。然后,在实时决策阶段,终端将采集到的特征数据反馈给控制器,通过跟控制器数据库中的信息比对来确定用户终端位置,提取出数据库中当前位置的优先链路并连接。最后,利用链路决策模型实时推导出网络通信指数,通过决策函数对数据库中的链路比例权重与网络通信指数聚合计算,求解出最优链路,并使用驻留定时器提高通信质量。仿真结果表明,与传统的模糊逻辑切换算法和等效 SNR 垂直切换决策算法对比,可以有效降低平均切换次数,切换中断概率下降明显。可见该算法实现了室内异构网络的智能化管理,改善用户体验质量。

    Abstract:

    Aiming at the problem of frequent switching due to transient link changes in the heterogeneous network of indoor Visible Light Communication (VLC) and Radio Frequency (RF) communication, a decision-making mechanism based on spatio-temporal characteristics for VLC/RF networks are proposed in this paper. Firstly, in the offline sampling stage, the database is constructed by processing and converting feature data such as spatial location, bandwidth, received signal strength, delay and signal-to-noise ratio of indoor grid points into proportional weights in the controller. Then, in the real-time decision-making phase, the terminal feeds the collected feature data back to the controller to determine the location of the user terminal by comparing it with the information in the database of the controller, and the prioritized link of the current location in the database is extracted and connected. Finally, the link decision model is used to derive the network communication index in real time, and the optimal link is solved by aggregating the proportional weights of the links in the database with the network communication index through the decision function, and the communication quality is improved using the resident timer. Simulation results show that compared with the traditional fuzzy logic switching algorithm and the equivalent SNR vertical switching decision algorithm, the average number of switching times can be effectively reduced, and the switching interruption probability decreases significantly. It can be seen that the algorithm realizes the intelligent management of indoor heterogeneous networks, and the quality of user experience is improved.

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陈北辰,陈硕,孙洪亮,等. 基于时空特性的VLC/RF网络决策机制[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-19
  • 最后修改日期:2024-05-11
  • 录用日期:2024-05-22
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