Understanding EDCA Characteristics Through Field Measurements
"Explore field measurements of EDCA characteristics in IEEE 802.11 networks conducted by students at the University of Colorado. The study assesses the usage of Access Categories (AC) like Voice, Video, Best Effort, and Background to ensure optimal data packet performance. Results show insights into application prioritization and potential latency issues. Discover more about this insightful research project."
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May 2025 doc.: IEEE 802.11-25/0897r0 Field measurements of EDCA characteristics Date: 2025-05-13 Authors: Name Company Address Phone email University of ColoradoStr. Academiei 12, jim.lansford@ieee.org Jim Lansford +1-719-286- 9277 Ap. 2, 307160 Dumbravita, Romania benjamin.nowotny@co lorado.edu jimmy.nolan@colorado .edu Ben Nowatny Jimmy Nolan Submission Slide 1 Jim Lansford et al, (University of Colorado)
May 2025 doc.: IEEE 802.11-25/0897r0 Abstract Measurements of EDCA Access Category tags applied to packets from a variety of applications Project reports from two students at University of Colorado - Boulder in WLAN class, Spring 2025 Submission Slide 2 Jim Lansford et al, (University of Colorado)
May 2025 doc.: IEEE 802.11-25/0897r0 Overview With the current focus on latency and reliability, we wish to assess whether applications are using current priority levels (Access Categories in EDCA) AC_VO (AC3) - Voice AC_VI (AC2) - Video AC_BE (AC1) - Best Effort AC_BK (AC0) - Background If applications are not using appropriate AC tags, data packets may suffer increased latency and poor reliability Two students (Ben & Jimmy) made measurements of various applications using Wireshark to identify AC tags Thanks to Ben (benjamin.nowotny@colorado.edu ) and Jimmy (jimmy.nolan@colorado.edu ) for permission to present their results Submission Slide 3 Jim Lansford et al, (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Project #1: Ben Nowatny Android phone running apps Kali Linux on PC for packet capture and Wireshark analysis Submission Slide 4 Jim Lansford et al, (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 YouTube YouTube video packets were all Best Effort Background packets appear to be Android updates Voice packets were ARP exchanges Submission Slide 5 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Google Phone Majority of packets were AC3 (Voice) as expected Best Effort packets appear to be management tasks Submission Slide 6 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Zoom Teleconference Zoom teleconference with both audio and video Surprisingly, essentially all traffic was Best Effort Submission Slide 7 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Application download from Play Store Downloading a typical app from the Google Play Store Best Effort as expected Submission Slide 8 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Video Game update and asset download PUBG: Battlegrounds: downloading new assets and setting up an update. PUBG: Battlegrounds (referred to as PBUG Mobile) is a live multiplayer shooting game Submission Slide 9 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Network Based Video Game Packet traffic for an online game of PUBG Mobile Includes gameplay data and voice All traffic appears to be Best Effort Submission Slide 10 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Project #2: Jimmy Nolan Setup Linux Mint PC with Alfa AWUS036ACS adapter for packet capture and Wireshark analysis Monitor mode in channel 11 (using software from github) Tested against two different laptops, iPhone 11 SE and Chromecast Submission Slide 11 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Remote Desktop over VPN Submission Slide 12 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Wi-Fi calling Submission Slide 13 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Discord (Voice) with YouTube Submission Slide 14 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Casting HBO from iPhone vis Chromecast Submission Slide 15 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 QoS Null Function Packets when using Chromecast Received a Wi-Fi voice call toward the end of the recording session Submission Slide 16 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 AIFSN Analysis Discord + YouTube Submission Slide 17 Jim Lansford et al (University of Colorado)
doc.: IEEE 802.11-25/0897r0 May 2025 Conclusion Wi-Fi calling applications seem to be using AC3 (AC_VO) as expected Zoom Teleconference used AC1 (AC_BE) Need to check Teams, Webex, GoToMeeting, Facetime, Facebook Messenger, WhatsApp Unclear where AC tags are or are not originating from: app? OS? AP? Driver? Network based videogame used AC1 (AC_BE) Would have expected games needing low latency to use AC3 or AC2 Need to test other games Chromecast of video stream was AC1 (AC_BE) Initial tests indicate Access Points seem to follow AIFSN rules Suggestions for next semester? Send email to jim.lansford@ieee.org or jim.lansford@colorado.edu Submission Slide 18 Jim Lansford et al (University of Colorado)
