Demystifying and puncturing the inflated delay in smartphone-based WiFi network measurement

Weichao Li, Daoyuan Wu, Kow Chuen Chang, Ricky K.P. Mok

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

7 Citations (Scopus)


Using network measurement apps has become a very effective approach to crowdsourcing WiFi network performance data. However, these apps usually measure the user-level performancemetrics instead of the network-level performance which is important for diagnosing performance problems. In this paper we report for the first time that a major source of measurement noises comes from the periodical SDIO (Secure Digital Input Output) bus sleep inside the phone. The additional latency introduced by SDIO and Power Saving Mode can inflate and unstablize network delay measurement significantly. We carefully design and implement a scheme to wake up the phone for delay measurement by sending just enough warm-up and background traffic. Our evaluation results show that the overall median delay overheads can be kept within 3ms, regardless of the actual network delay.
Original languageEnglish
Title of host publicationCoNEXT 2016 - Proceedings of the 12th International Conference on Emerging Networking EXperiments and Technologies
PublisherAssociation for Computing Machinery, Inc
Number of pages8
ISBN (Electronic)9781450342926
Publication statusPublished - 6 Dec 2016
Event12th ACM Conference on Emerging Networking Experiments and Technologies, ACM CoNEXT 2016 - Irvine, United States
Duration: 12 Dec 201615 Dec 2016


Conference12th ACM Conference on Emerging Networking Experiments and Technologies, ACM CoNEXT 2016
Country/TerritoryUnited States


  • Accuracy
  • Android
  • Network measurement
  • WiFi

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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