Firefly is an untethered multi-user virtual reality (VR) system for commodity mobile devices. It supports more than 10 users to simultaneously enjoy high-quality VR content using a single commodity server, a single WiFi access point, and commercial off-the-shelf (COTS) mobile devices. Firefly employs a series of techniques including offline content preparation, viewport-adaptive streaming with motion prediction, adaptive content quality control among users, to name a few, to ensure good image quality, low motion-to-photon delay, a high frame rate at 60 FPS, scalability with respect to the number of users, and fairness among users. We have implemented Firefly in 17,400 lines of code. We use our prototype to demonstrate, for the first time, the feasibility of supporting 15 mobile VR users at 60 FPS using COTS smartphones and a single AP/server.
|Original language||English (US)|
|Title of host publication||Proceedings of the 2020 USENIX Annual Technical Conference, ATC 2020|
|Number of pages||15|
|State||Published - 2020|
|Event||2020 USENIX Annual Technical Conference, ATC 2020 - Virtual, Online|
Duration: Jul 15 2020 → Jul 17 2020
|Name||Proceedings of the 2020 USENIX Annual Technical Conference, ATC 2020|
|Conference||2020 USENIX Annual Technical Conference, ATC 2020|
|Period||7/15/20 → 7/17/20|
Bibliographical noteFunding Information:
We thank the voluntary users who participated in our study, the anonymous reviewers for their valuable comments, and Philip Levis for shepherding the paper. This work was supported in part by NSF Award #1903880 and #1915122.