针对传统云服务应用于车联网大数据处理时存在通信时间消耗大、服务质量无法保证的问题,提出一种低时延的分布式路径计算方案。利用云雾网络架构将数据业务就近上传到雾网络设备以及云服务平台;为了让雾网络设备协同处理车载业务,采用一种基于该架构的任务映射策略(也称为业务卸载策略)
将以有向无环图表示的车载业务流模型映射到以无向图表示的雾网络拓扑中;为了解决映射中存在的时延波动问题,采用一种改进的离散二值粒子群优化(NBPSO)算法进行优化;将该算法与负载均衡技术相结合得到最优映射方案。仿真结果表明:所提出的分布式路径协同计算方案可有效解决云计算模式下数据处理的高延时问题;当数据量为12 Mb时,采用所提方案的时延比采用云计算的时延降低约2.95 s。
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