Delivery latency trade-offs of heterogeneous contents in fog radio access networks

Jasper Goseling, Osvaldo Simeone, Petar Popovski

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

8 Citations (Scopus)
95 Downloads (Pure)


A Fog Radio Access Network (F-RAN) is a cellular wireless system that enables content delivery via the caching of popular content at edge nodes (ENs) and cloud processing. The existing information-theoretic analyses of F-RAN systems, and special cases thereof, make the assumption that all requests should be guaranteed the same delivery latency, which results identical latency for all files in the content library. In practice, however, contents may have heterogeneous timeliness requirements depending on the applications that operate on them. Given per-EN cache capacity constraint, there exists a fundamental trade-off among the delivery latencies of different users’ requests, since contents that are allocated more cache space generally enjoy lower delivery latencies. For the case with two ENs and two users, the optimal latency trade-off is characterized in the high-SNR regime in terms of the Normalized Delivery Time (NDT) metric. The main results are illustrated by numerical examples.
Original languageEnglish
Title of host publicationGLOBECOM 2017
Subtitle of host publication2017 IEEE Global Communications Conference
Place of PublicationPiscataway, NJ
Number of pages6
ISBN (Print)978-1-5090-2/17
Publication statusPublished - 2017
EventIEEE GLOBECOM 2017: Global Hub: Connecting East and West - Marina Bay Sands Expo and Convention Centre, Singapore, Singapore
Duration: 4 Dec 20178 Dec 2017


ConferenceIEEE GLOBECOM 2017
Abbreviated titleGLOBECOM 2017
Internet address


  • Edge caching
  • Cloud Radio Access Network
  • Fog Radio Access Network
  • Normalized Delivery Time

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