Joint cloud and edge processing for latency minimization in Fog Radio Access Networks

Seok Hwan Park, Osvaldo Simeone, Shlomo Shamai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

24 Scopus citations

Abstract

This work studies the joint design of cloud and edge processing for latency minimization in the downlink of a fog radio access network (F-RAN). In an F-RAN, edge processing allows the low-latency delivery of popular multimedia content by leveraging caching at enhanced remote radio heads (eRRHs). Cloud processing, instead, enables the transmission of arbitrary content at high spectral efficiencies thanks to the centralized control at a baseband processing unit (BBU), but at the cost of a potentially larger latency due to BBU-to-eRRHs communication over fronthaul links. For an arbitrary caching, or pre-fetching, strategy, the design of the delivery phase is studied based on the use of the fronthaul links in either or both hard-transfer and soft-transfer modes. The problem of minimizing the delivery latency, encompassing both fronthaul and wireless transmissions, of the requested contents from the BBU to the requesting user equipments (UEs) is tackled with respect to channel precoding and fronthaul compression strategies. Numerical results are provided to compare the latency performance of the hard- and soft-transfer fronthauling schemes in terms of delivery latency, offering new insights as compared to existing studies that focus solely on the transmission rate of the wireless segment.

Original languageEnglish (US)
Title of host publicationSPAWC 2016 - 17th IEEE International Workshop on Signal Processing Advances in Wireless Communications
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509017492
DOIs
StatePublished - Aug 9 2016
Event17th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2016 - Edinburgh, United Kingdom
Duration: Jul 3 2016Jul 6 2016

Publication series

NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
Volume2016-August

Other

Other17th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2016
Country/TerritoryUnited Kingdom
CityEdinburgh
Period7/3/167/6/16

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Information Systems

Keywords

  • C-RAN
  • Fog radio access network
  • beamforming
  • edge caching
  • fronthaul compression
  • latency
  • prefetching

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