In this study, an update code using vehicles joint unmanned aerial vehicle (UC-VU) scheme is proposed to disseminate code for smart sensing devices (SSDs) in the smart city. The innovations of the UC-VU scheme are as follows. (i) The unmanned aerial vehicle (UAV) is adopted to disseminate code at the beginning of code dissemination for the SSDs which are difficult to get code through mobile vehicles. Thus, the average delay required for SSDs to get code can be reduced. (ii) Smart storage devices are selected as interim code stations and the strategy of selecting interim code stations’ location and number for code dissemination is proposed to disseminate code efficiently. This makes mobile vehicles can get code from code station for code dissemination which changed the situation where code dissemination is slow due to only one code station disseminates code. (iii) This study also gives the optimisation strategy of the UAV flight trajectory to optimise the flight distance. The key performance indicators such as code dissemination rate compared to previous strategies increases 34.6%, the average dissemination time, the time that all SSDs get the code and the UAV flight trajectory's path decrease by 26.27, 25.30, and 71.67%, respectively.

中文翻译：

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通过无人机联合车辆实现智能城市的最小代码传播延迟

在这项研究中，提出了一种使用车辆联合无人飞行器（UC-VU）方案的更新代码，以在智能城市中传播用于智能传感设备（SSD）的代码。UC-VU方案的创新如下。（i）在难以通过移动车辆获取代码的SSD的代码发布开始时，采用无人机（UAV）进行代码发布。因此，可以减少SSD获取代码所需的平均延迟。（ii）选择智能存储设备作为临时代码站，并提出了选择临时代码站的位置和编号进行代码分发的策略，以有效地分发代码。这使得移动车辆可以从中获取代码用于代码分发的代码站，改变了由于仅一个代码站分发代码而导致代码分发缓慢的情况。（iii）本研究还给出了无人机飞行轨迹的优化策略，以优化飞行距离。与以前的策略相比，关键性能指标（如代码分发率）提高了34.6％，平均分发时间，所有SSD均获得代码的时间和无人机飞行轨迹的路径分别减少了26.27、25.30和71.67％。