面向可靠端边协同的时延保障模型

由于无线链路状态的高度时变性，终端任务的卸载存在失败的可能性，导致任务时延恶化，甚至任务失败.针对上述问题，提出了面向可靠端边协同的时延保障模型.首先，基于嵌入式马尔可夫理论分析了任务卸载时延的统计特征；然后，基于网络演算理论推导出设备端任务计算时延的概率分布；最后，提出面向时延与可靠性感知的性能评估模型.分析结果表明，与面向平均时延或平均速率最优的决策方案相比，所提方案能够提升具有特定时延需求的任务可靠性.

Latency Guarantee Model for Reliable Edge-Node Cooperation

Due to highly time-varying wireless link state, the terminal tasks offloading may fail, resulting in task delay deterioration or even task failure. A latency guarantee model is derived for reliable edge-node cooperation. Firstly, the statistical characteristics of task offloading delay is analyzed based on embedded Markov theory. Secondly, the probabilistic delay of task computing on device side is characterized based on network calculus theory. Finally, a performance evaluation model oriented to delay and reliability perception is proposed. Analysis validates that the proposed strategy can improve the task reliability with specific delay requirements compared with the schemes based on average delay or average rate optimization.