Masking latency by speculating on future events for highly interactive cloud-based remote rendering.  Using statistical inference over likely user actions, state space approximation, and fast state checkpoint and restore, we show it is possible to provide the experience of low latency for mobile clients even if their latency to the datacenter is over 100ms.  The technology is demonstrated on two of the most demanding interactive applications today: twitch-based gaming and head-mounted virtual reality.

 

Relevant Papers

• [PG2016] Proxy-guided Image-based Rendering for Mobile Devices
  Bernhard Reinert, Johannes Kopf, Tobias Ritschel, Eduardo Cuervo, David Chu, Hans-Peter Seidel.
• [MobiSys2016] FlashBack: Bringing Immersive Virtual Reality to Mobile Devices through Aggressive Rendering Memoization
  Kevin Boos, David Chu, Eduardo Cuervo.
• [GetMobile] Outatime: Using Speculation to Enable Low-Latency Continuous Interaction for Mobile Cloud Gaming
  Kyungmin Lee, David Chu, Eduardo Cuervo, Johannes Kopf, Yury Degtyarev, Sergey Grizan, Alec Wolman, Jason Flinn.
• [SoCC2015] dJay: Enabling High-density Multi-tenancy for Cloud Gaming Servers with Dynamic Cost-Benefit GPU Load Balancing
  Sergey Grizan, David Chu, Alec Wolman, Roger Wattenhofer.
• [UbiComp2015] Prime: A Framework for Scaling Co-located Multi-Device Apps
  David Chu, Zengbin Zhang, Alec Wolman, Nic Lane.
• [MobiSys2015] Demo: Irides: Attaining Quality, Responsiveness and Mobility for Virtual Reality Head-mounted Displays
  Yury Degtyarev, Eduardo Cuervo, David Chu.
• [MobiSys2015] Outatime: Using Speculation to Enable Low-Latency Continuous Interaction for Mobile Cloud Gaming
  Kyungmin Lee, David Chu, Eduardo Cuervo, Johannes Kopf, Yury Degtyarev, Sergey Grizan, Alec Wolman, Jason Flinn. Best Paper
• [MobiSys2014] Demo: DeLorean: Using Speculation to Enable Low-Latency Continuous Interaction for Mobile Cloud Gaming
  Kyungmin Lee, David Chu, Eduardo Cuervo, Johannes Kopf, Alec Wolman, Jason Flinn. Best Demo

Videos

See Proxy-guided IBR in action!

See FlashBack in action!

See Outatime in action!

See Irides in action!

 

News

Seeking to offer Kinect-like experiences using only mobile devices, leading to new mobile gaming experiences.  Key technical achievements include development of fast, accurate and robust phone-to-phone distance measurement system, and a 3D phone-to-phone measurement techniques. Several innovative games, including SwordFight, have been prototyped.

 

Relevant Papers

• [Pervasive Computing] SwordFight: Exploring Phone-to-Phone Motion Games
  Zengbin Zhang, David Chu, Xiaomeng Chen, Thomas Moscibroda.
• [TMC] Mobile Motion Gaming: Enabling a New Class of Phone-to-Phone Action Games on Commodity Phones
  Zengbin Zhang, David Chu, Xiaomeng Chen, Thomas Moscibroda.
• [UbiComp2014] Leveraging Directional Antenna Capabilities for Fine-Grained Gesture Recognition
  Pedro Melgarejo, Xinyu Zhang, Parmesh Ramanathan, David Chu.
• [TMC2013] Mobile Motion Gaming: Enabling a New Class of Phone-to-Phone Action Games on Commodity Phones
  Zengbin Zhang, David Chu, Xiaomeng Cheng, Thomas Moscibroda.
• [PervasiveComputing2012] SwordFight: Exploring Phone-to-Phone Motion Games
  Zengbin Zhang, David Chu, Xiaomeng Cheng, Thomas Moscibroda.
• [MobiSys2012] Demo: Phone-to-Phone Mobile Motion Gaming on Commodity Phones
  Zengbin Zhang, David Chu, Xiaomeng Chen, Thomas Moscibroda.
• [MobiSys2012] SwordFight: Enabling a New Class of Phone-to-Phone Action Games on Commodity Phones
  Zengbin Zhang, David Chu, Xiaomeng Chen, Thomas Moscibroda. Best Paper Nominee
• [SenSys2011] Demo: Sword Fight With Smartphones
  Zengbin Zhang, Jian Qiu, David Chu, Thomas Moscibroda. Best Demo Nominee
• [SenSys2011] On the Feasibility of Real-Time Phone-to-Phone 3D Localization
  Jian Qiu, David Chu, Xiangying Meng, Thomas Moscibroda.

Videos

News

Investigating the impact of context data on the mobile operating system.  Core contributions include identifying the benefits of OS managed context, and uses of context by the OS.  As a concrete example, faster app launching based on context signals such as location and temporal access patterns is investigated in detail.

 

Relevant Papers

• [MobiHoc2015] EarlyBird: Mobile Prefetching of Social Network Feeds via Content Preference Mining and Usage Pattern Analysis
  Yichuan Wang, Xin Liu, David Chu, Yunxin Liu.
• [UbiComp2013] Practical Prediction and Prefetch for Faster Access to Applications on Mobile Phones
  Abhinav Parate, Matthias Böhmer, David Chu, Deepak Ganesan, Benjamin Marlin.
• [WebApps2012] Gibraltar: Exposing Hardware Devices to Web Pages Using AJAX
  Kaisen Lin, David Chu, James Mickens, Li Zhuang, Feng Zhao, Jian Qiu.
• [MobiSys2012] Fast App Launching for Mobile Devices Using Predictive User Context
  Tingxin Yan, David Chu, Deepak Ganesan, Aman Kansal, Jie Liu.
• [SenSys2011] Balancing Energy, Latency and Accuracy for Mobile Sensor Data Classification
  David Chu, Nicholas Lane, Tsung-te Lai, Cong Pang, Fan Li, Xiangying Meng, Qing Guo, Feng Zhao.
• [HotOS2011] Mobile Apps: It's time to move up to ConDOS
  David Chu, Aman Kansal, Jie Liu, Feng Zhao.

News

 

See the old project page.