Dynamic Task Offloading and Resource Allocation for Ultra-Reliable Low-Latency Edge Computing

Chen Feng Liu, Mehdi Bennis, Merouane Debbah, H. Vincent Poor

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

To overcome devices' limitations in performing computation-intense applications, mobile edge computing (MEC) enables users to offload tasks to proximal MEC servers for faster task computation. However, the current MEC system design is based on average-based metrics, which fails to account for the ultra-reliable low-latency requirements in mission-critical applications. To tackle this, this paper proposes a new system design, where probabilistic and statistical constraints are imposed on task queue lengths, by applying extreme value theory. The aim is to minimize users' power consumption while trading off the allocated resources for local computation and task offloading. Due to wireless channel dynamics, users are reassociated to MEC servers in order to offload tasks using higher rates or accessing proximal servers. In this regard, a user-server association policy is proposed, taking into account the channel quality as well as the servers' computation capabilities and workloads. By marrying tools from Lyapunov optimization and matching theory, a two-timescale mechanism is proposed, where a user-server association is solved in the long timescale, while a dynamic task offloading and resource allocation policy are executed in the short timescale. The simulation results corroborate the effectiveness of the proposed approach by guaranteeing highly reliable task computation and lower delay performance, compared to several baselines.

Original languageEnglish (US)
Article number8638800
Pages (from-to)4132-4150
Number of pages19
JournalIEEE Transactions on Communications
Volume67
Issue number6
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • 5G and beyond
  • extreme value theory
  • fog networking and computing
  • mobile edge computing (MEC)
  • ultra-reliable low latency communications (URLLC)

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