Publications

2023

1. NSDI

   Dashlet: Taming Swipe Uncertainty for Robust Short Video Streaming

   Zhuqi Li, Yaxiong Xie, Netravali Ravi, and Kyle Jamieson

   In USENIX Conference on Networked Systems Design and Implementation (NSDI), 2023

   Abs Bib

   Short video streaming applications have recently gained substantial traction, but the non-linear video presentation they afford swiping users fundamentally changes the problem of maximizing user quality of experience in the face of the vagaries of network throughput and user swipe timing. This paper describes the design and implementation of Dashlet, a system tailored for high quality of experience in short video streaming applications. With the insights we glean from an in-the-wild TikTok performance study and a user study focused on swipe patterns, Dashlet proposes a novel out-of-order video chunk pre-buffering mechanism that leverages a simple, non machine learning-based model of users’ swipe statistics to determine the pre-buffering order and bitrate. The net result is a system that outperforms TikTok by 28-101%, while also reducing by 30% the number of bytes wasted on downloaded video that is never watched.

   @inproceedings{Dashlet,
     author = {Li, Zhuqi and Xie, Yaxiong and Ravi, Netravali and Jamieson, Kyle},
     title = {{Dashlet: Taming Swipe Uncertainty for Robust Short Video Streaming}},
     year = {2023},
     booktitle = {USENIX Conference on Networked Systems Design and Implementation (NSDI)},
     series = {\textbf{NSDI}},
   }

2. NSDI

   RF-Bouncer: A Programmable Dual-band Metasurface for Sub-6 Wireless Networks

   Xinyi Li, Chao Feng, Xiaojing Wang, Yangfan Zhang, Yaxiong Xie, and Xiaojiang Chen

   In USENIX Conference on Networked Systems Design and Implementation (NSDI), 2023

   Abs Bib

   Offloading the beamforming task from the endpoints to the metasurface installed in the propagation environment has attracted significant attention. Currently, most of the metasurface-based beamforming solutions are designed and optimized for operation on a single ISM band (either 2.4 GHz or 5 GHz). In this paper, we propose RF-Bouncer, a compact, low-cost, simple-structure programmable dual-band metasurface that supports concurrent beamforming on two Sub-6 ISM bands. By configuring the states of the meta-atoms, the metasurface is able to simultaneously steer the incident signals from two bands towards their desired departure angles. We fabricate the metasurface and validate its performance via extensive experiments. Experimental results demonstrate that RF-Bouncer achieves 15.4 dB average signal strength improvement and a 2.49× throughput improvement even with a relatively small 16× 16 array of meta-atoms.

   @inproceedings{RF-Bouncer,
     author = {Li, Xinyi and Feng, Chao and Wang, Xiaojing and Zhang, Yangfan and Xie, Yaxiong and Chen, Xiaojiang},
     title = {{RF-Bouncer: A Programmable Dual-band Metasurface for Sub-6 Wireless Networks}},
     year = {2023},
     booktitle = {USENIX Conference on Networked Systems Design and Implementation (NSDI)},
     series = {\textbf{NSDI}},
   }

3. MobiSys

   Fusang: Graph-inspired Robust and Accurate Object Recognition on Commodity mmWave Devices

   Guorong He, Shaojie Chen, Dan Xu, Xiaojiang Chen, Yaxiong Xie, Xinhuai Wang, and Dingyi Fang

   In ACM International Conference on Mobile Systems, Applications, and Services (MobiSys), 2023

   Bib

   @inproceedings{Fusang,
     title = {{Fusang: Graph-inspired Robust and Accurate Object Recognition on Commodity mmWave Devices}},
     author = {He, Guorong and Chen, Shaojie and Xu, Dan and Chen, Xiaojiang and Xie, Yaxiong and Wang, Xinhuai and Fang, Dingyi},
     year = {2023},
     booktitle = {ACM International Conference on Mobile Systems, Applications, and Services (MobiSys)},
     series = {\textbf{MobiSys}},
   }

4. UbiComp

   Waffle: A Waterproof mmWave-based Human Sensing System inside Bathrooms with Running Water

   Xuesheng Zhang, Duo Zhang, Yaxiong Xie, Dan Wu, Yang Li, and Daqing Zhang

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2023

   Bib

   @inproceedings{Waffle,
     title = {{Waffle: A Waterproof mmWave-based Human Sensing System inside Bathrooms with Running Water}},
     author = {Zhang, Xuesheng and Zhang, Duo and Xie, Yaxiong and Wu, Dan and Li, Yang and Zhang, Daqing},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
     year = {2023},
   }

5. UbiComp

   LoCal: An Automatic Location Attribute Calibration Approach for Large-Scale Deployment of mmWave-based Sensing Systems

   Duo Zhang, Xuesheng Zhang, Yaxiong Xie, Fusang Zhang, Xuanzhi Wang, Yang Li, and Daqing Zhang

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2023

   Bib

   @inproceedings{Local,
     title = {{LoCal: An Automatic Location Attribute Calibration Approach for Large-Scale Deployment of mmWave-based Sensing Systems}},
     author = {Zhang, Duo and Zhang, Xuesheng and Xie, Yaxiong and Zhang, Fusang and Wang, Xuanzhi and Li, Yang and Zhang, Daqing},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
     year = {2023},
   }

6. UbiComp

   LT-Fall: The Design and Implementation of a Life-threatening Fall Detection and Alarming System

   Duo Zhang, Xusheng Zhang, Shengjie Li, Yaxiong Xie, Yang Li, Xuanzhi Wang, and Daqing Zhang

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2023

   Bib

   @inproceedings{MrFall,
     title = {{LT-Fall: The Design and Implementation of a Life-threatening Fall Detection and Alarming System }},
     author = {Zhang, Duo and Zhang, Xusheng and Li, Shengjie and Xie, Yaxiong and Li, Yang and Wang, Xuanzhi and Zhang, Daqing},
     year = {2023},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
     series = {\textbf{UbiComp}},
   }

2022

1. SenSys

   SiFall: Practical Online Fall Detection with RF Sensing

   Sijie Ji, Yaxiong Xie, and Mo Li

   In ACM Conference on Embedded Networked Sensor Systems (SenSys), 2022

   Bib

   @inproceedings{SiFall,
     author = {Ji, Sijie and Xie, Yaxiong and Li, Mo},
     title = {{SiFall: Practical Online Fall Detection with RF Sensing}},
     year = {2022},
     booktitle = {ACM Conference on Embedded Networked Sensor Systems (SenSys)},
     series = {\textbf{SenSys}},
   }

2. SenSys

   LTE-based Low-cost and Low-power Soil Moisture Sensing

   Yuda Feng, Yaxiong Xie, Deepak Ganesan, and Jie Xiong

   In ACM Conference on Embedded Networked Sensor Systems (SenSys), 2022

   Bib

   @inproceedings{LTE-Soil,
     author = {Feng, Yuda and Xie, Yaxiong and Ganesan, Deepak and Xiong, Jie},
     title = {{LTE-based Low-cost and Low-power Soil Moisture Sensing}},
     year = {2022},
     booktitle = {ACM Conference on Embedded Networked Sensor Systems (SenSys)},
     series = {\textbf{SenSys}},
   }

3. SigMetrics

   NG-Scope: Fine-Grained Telemetry for NextG Cellular Networks

   Yaxiong Xie, and Kyle Jamieson

   In ACM Special Interest Group for the Computer Systems Performance Evaluation Community (SigMetrics), 2022

   Abs Bib Code

   Accurate and highly-granular channel capacity telemetry of the cellular last hop is crucial for the effective operation of transport layer protocols and cutting edge applications, such as video on demand and video telephony. This paper presents the design, implementation, and experimental performance evaluation of NG-Scope, the first such telemetry tool able to fuse physical-layer channel occupancy readings from the cellular control channel with higher-layer packet arrival statistics and make accurate capacity estimates. NG-Scope handles the latest cellular innovations, such as when multiple base stations aggregate their signals together to serve mobile users. End-to-end experiments in a commercial cellular network demonstrate that wireless capacity varies significantly with channel quality, mobility, competing traffic within each cell, and the number of aggregated cells. Our experiments demonstrate significantly improved cell load estimation accuracy, missing the detection of less than 1% of data capacity overall, a reduction of 82% compared to OWL, the state-of-the-art in cellular monitoring. Further experiments show that MobileInsight-based CLAW has a root-mean-squared capacity error of 30.5 Mbit/s, which is 3.3× larger than NG-Scope (9.2 Mbit/s).

   @inproceedings{ngscope,
     author = {Xie, Yaxiong and Jamieson, Kyle},
     title = {{NG-Scope: Fine-Grained Telemetry for NextG Cellular Networks}},
     year = {2022},
     booktitle = {ACM Special Interest Group for the Computer Systems Performance Evaluation Community (SigMetrics)},
   }

4. MobiCom

   SmartLens: Sensing Eye Activities Using Zero-Power Contact Lens

   Liyao Li, Yaxiong Xie, Jie Xiong, Ziyu Hou, Yingchun Zhang, Qing We, Fuwei Wang, Dingyi Fang, and Xiaojiang Chen

   In Annual International Conference on Mobile Computing and Networking (MobiCom), 2022

   Abs Bib Video Code

   As the most important organs of sense, human eyes perceive 80% information from our surroundings. Eyeball movement is closely related to our brain health condition. Eyeball movement and eye blink are also widely used as an efficient human-computer interaction scheme for paralyzed individuals to communicate with others. Traditional methods mainly use intrusive EOG sensors or cameras to capture eye activity information. In this work, we propose a system named SmartLens to achieve eye activity sensing using zero-power contact lens. To make it happen, we develop dedicated antenna design which can be fitted in an extremely small space and still work efficiently to reach a working distance more than 1 m. To accurately track eye movements in the presence of strong self-interference, we employ another tag to track the user’s head movement and cancel it out to support sensing a walking or moving user. Comprehensive experiments demonstrate the effectiveness of the proposed system. At a distance of 1.4 m, the proposed system can achieve an average accuracy of detecting the basic eye movement and blink at 89.63% and 82%, respectively.

   @inproceedings{smartlens,
     author = {Li, Liyao and Xie, Yaxiong and Xiong, Jie and Hou, Ziyu and Zhang, Yingchun and We, Qing and Wang, Fuwei and Fang, Dingyi and Chen, Xiaojiang},
     title = {{SmartLens: Sensing Eye Activities Using Zero-Power Contact Lens}},
     booktitle = {Annual International Conference on Mobile Computing and Networking (MobiCom)},
     year = {2022},
     video = {https://www.youtube.com/watch?v=vAx_6-Ik2yk},
   }

5. UbiComp

   Cellular-Assisted, Deep Learning Based COVID-19 Contact Tracing

   Fan Yi, Yaxiong Xie, and Kyle Jamieson

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2022

   Bib

   @inproceedings{covid,
     author = {Yi, Fan and Xie, Yaxiong and Jamieson, Kyle},
     title = {{Cellular-Assisted, Deep Learning Based COVID-19 Contact Tracing}},
     year = {2022},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
   }

6. UbiComp

   Towards Robust Gesture Recognition by Characterizing the Sensing Quality of WiFi Signals

   Ruiyang Gao, Wenwei Li, Yaxiong Xie, Enze Yi, Leye Wang, Dan Wu, and Daqing Zhang

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2022

   Bib

   @inproceedings{longrangewifi,
     author = {Gao, Ruiyang and Li, Wenwei and Xie, Yaxiong and Yi, Enze and Wang, Leye and Wu, Dan and Zhang, Daqing},
     title = {{Towards Robust Gesture Recognition by Characterizing the Sensing Quality of WiFi Signals}},
     year = {2022},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
   }

7. UbiComp

   DiverSense: Maximizing Wi-Fi Sensing Range Leveraging Signal Diversity

   Yang Li, Dan Wu, Jie Zhang, Xuhai Xu, Yaxiong Xie, Tao Gu, and Daqing Zhang

   In ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp), 2022

   Bib

   @inproceedings{diversense,
     author = {Li, Yang and Wu, Dan and Zhang, Jie and Xu, Xuhai and Xie, Yaxiong and Gu, Tao and Zhang, Daqing},
     title = {{DiverSense: Maximizing Wi-Fi Sensing Range Leveraging Signal Diversity}},
     year = {2022},
     booktitle = {ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)},
   }

2021

1. WiOpt

   The Case for Small-Scale, Mobile-Enhanced COVID-19 Epidemiology

   Fan Yi, Yaxiong Xie, and Kyle Jamieson

   In International Symposium on Modeling and Optimization in Mobile, Ad hoc, and Wireless Networks (WiOpt), 2021

   Bib

   @inproceedings{coivd-wiopt,
     author = {Yi, Fan and Xie, Yaxiong and Jamieson, Kyle},
     booktitle = {International Symposium on Modeling and Optimization in Mobile, Ad hoc, and Wireless Networks (WiOpt)},
     title = {The Case for Small-Scale, Mobile-Enhanced COVID-19 Epidemiology},
     year = {2021},
   }

2. SenSys

   LTE-Based Pervasive Sensing Across Indoor and Outdoor

   Yuda Feng, Yaxiong Xie, Deepak Ganesan, and Jie Xiong

   In ACM Conference on Embedded Networked Sensor Systems (SenSys), 2021

   Bib

   @inproceedings{ltesense,
     author = {Feng, Yuda and Xie, Yaxiong and Ganesan, Deepak and Xiong, Jie},
     title = {{LTE-Based Pervasive Sensing Across Indoor and Outdoor}},
     year = {2021},
     booktitle = {ACM Conference on Embedded Networked Sensor Systems (SenSys)},
   }

2020

1. SIGCOMM

   PBE-CC: Congestion Control via Endpoint-Centric, Physical-Layer Bandwidth Measurements

   Yaxiong Xie, Fan Yi, and Kyle Jamieson

   In the Annual Conference of the ACM Special Interest Group (SIGCOMM), 2020

   Bib

   @inproceedings{pbecc,
     author = {Xie, Yaxiong and Yi, Fan and Jamieson, Kyle},
     title = {{PBE-CC: Congestion Control via Endpoint-Centric, Physical-Layer Bandwidth Measurements}},
     year = {2020},
     booktitle = {the Annual Conference of the ACM Special Interest Group (SIGCOMM)},
   }

2019

1. MobiCom

   MD-Track: Leveraging Multi-Dimensionality for Passive Indoor Wi-Fi Tracking

   Yaxiong Xie, Jie Xiong, Mo Li, and Kyle Jamieson

   In International Conference on Mobile Computing and Networking (MobiCom), 2019

   Bib

   @inproceedings{mdtrack,
     author = {Xie, Yaxiong and Xiong, Jie and Li, Mo and Jamieson, Kyle},
     title = {{MD-Track: Leveraging Multi-Dimensionality for Passive Indoor Wi-Fi Tracking}},
     year = {2019},
     booktitle = { International Conference on Mobile Computing and Networking (MobiCom)},
   }

2. NSDI

   Towards Programming the Radio Environment with Large Arrays of Inexpensive Antennas

   Zhuqi Li, Yaxiong Xie, Longfei Shangguan, R. Ivan Zelaya, Jeremy Gummeson, Wenjun Hu, and Kyle Jamieson

   In USENIX Conference on Networked Systems Design and Implementation (NSDI), 2019

   Bib

   @inproceedings{press,
     author = {Li, Zhuqi and Xie, Yaxiong and Shangguan, Longfei and Zelaya, R. Ivan and Gummeson, Jeremy and Hu, Wenjun and Jamieson, Kyle},
     title = {{Towards Programming the Radio Environment with Large Arrays of Inexpensive Antennas}},
     year = {2019},
     booktitle = {USENIX Conference on Networked Systems Design and Implementation (NSDI)},
   }

3. INFOCOM

   Synthesizing Wider WiFi Bandwidth for Respiration Rate Monitoring in Dynamic Environments

   Shuyu Shi, Yaxiong Xie, Mo Li, Alex X. Liu, and Jun Zhao

   In Annual IEEE International Conference on Computer Communications (INFOCOM), 2019

   Bib

   @inproceedings{wideband_resp,
     author = {Shi, Shuyu and Xie, Yaxiong and Li, Mo and Liu, Alex X. and Zhao, Jun},
     title = {{Synthesizing Wider WiFi Bandwidth for Respiration Rate Monitoring in Dynamic Environments}},
     booktitle = {Annual IEEE International Conference on Computer Communications (INFOCOM)},
     series = {\textbf{INFOCOM}},
     year = {2019},
   }

2018

1. MobiCom

   SWAN: Stitched Wi-Fi ANtennas

   Yaxiong Xie, Yanbo Zhang, Jansen Christian Liando, and Mo Li

   In Annual International Conference on Mobile Computing and Networking (MobiCom), 2018

   Bib

   @inproceedings{swan,
     author = {Xie, Yaxiong and Zhang, Yanbo and Liando, Jansen Christian and Li, Mo},
     title = {{SWAN: Stitched Wi-Fi ANtennas}},
     year = {2018},
     booktitle = {Annual International Conference on Mobile Computing and Networking (MobiCom)},
     series = {\textbf{MobiCom}},
   }

2016

1. INFOCOM

   Augmenting Wide-band 802.11 Transmissions via Unequal Packet Bit Protection

   Yaxiong Xie, Zhenjiang Li, Mo Li, and Kyle Jamieson

   In IEEE International Conference on Computer Communications (INFOCOM), 2016

   Bib

   @inproceedings{unequal_pkt,
     author = {Xie, Yaxiong and Li, Zhenjiang and Li, Mo and Jamieson, Kyle},
     booktitle = {IEEE International Conference on Computer Communications (INFOCOM)},
     title = {{Augmenting Wide-band 802.11 Transmissions via Unequal Packet Bit Protection}},
     year = {2016},
     series = {\textbf{INFOCOM}},
   }

2015

1. MobiCom

   Precise Power Delay Profiling with Commodity Wi-Fi

   Yaxiong Xie, Zhenjiang Li, and Mo Li

   In International Conference on Mobile Computing and Networking (MobiCom), 2015

   Bib

   @inproceedings{splicer,
     author = {Xie, Yaxiong and Li, Zhenjiang and Li, Mo},
     title = {{Precise Power Delay Profiling with Commodity Wi-Fi}},
     year = {2015},
     booktitle = { International Conference on Mobile Computing and Networking (MobiCom)},
     series = {\textbf{MobiCom}},
   }

2. MobiCom

   Recitation: Rehearsing Wireless Packet Reception in Software

   Zhenjiang Li, Yaxiong Xie, Mo Li, and Kyle Jamieson

   In Annual International Conference on Mobile Computing and Networking (MobiCom), 2015

   Bib

   @inproceedings{recitation,
     author = {Li, Zhenjiang and Xie, Yaxiong and Li, Mo and Jamieson, Kyle},
     title = {Recitation: Rehearsing Wireless Packet Reception in Software},
     year = {2015},
     booktitle = {Annual International Conference on Mobile Computing and Networking (MobiCom)},
     series = {MobiCom},
   }