Achieving an end-to-end low-latency for computations offloading, in Mobile Edge Computing (MEC) systems, is still a critical design problem. This is because the offloading of computational tasks via the MEC servers entails the use of uplink (UL) and downlink (DL) radio links that are usually assumed to be coupled to a single base station (BS). However, for heterogeneous networks, a new architectural paradigm whereby UL and DL are not associated with the same BS is proposed and seen to provide gains in network throughput due to the improved UL performance. Motivated by such gains, and by using typical results from stochastic geometry, we formulate the offloading latency for the MEC-based scheme with decoupled UL/DL association, or decoupled access, and compare its performance to the conventional coupled access scheme. Despite the backhaul delay necessary for the communication between the two serving BSs in UL and DL, the offloading scheme with decoupled access is still capable of providing a fairly lower offloading latency compared to the conventional offloading scheme with coupled access.
翻译:在移动边缘电子计算系统(MEC)中,实现计算卸载的端到端低延迟仍是一个关键的设计问题,因为通过MEC服务器卸载计算任务需要使用通常假定与单一基地台(BS)连接的上链(UL)和下链(DL)无线电连接。然而,对于各式网络来说,提出了一个新的建筑范式,即UL和DL不与同一个BS挂钩,并被认为由于UL性能的改善而使网络吞吐量增加。 受这些增益的驱动,以及利用随机几何方法的典型结果,我们为以MEC为基础的计划制定卸载延绳,同时拆开UL/DL的连接,或拆开连接接入,并将其性能与常规连接接入计划进行比较。尽管UL和DL两个服务BS之间的通信需要背部延误,但卸载后接通的连接系统仍然能够提供相对常规的卸载通路的低端连接计划。