Towards practical metasurface deployment in 5G NR, NR-Surface is the first real-time reconfigurable NR-Compliant metasurface, operating at micro-watt regime for multi-year battery-lifetime. Appeared in NSDI 24.

Despite the potential of vision-based monitoring, data leakage concerns hinder its wide deployment in personal spaces. Mosaic presents a vision-based end-to-end action recognition framework that intrinsically achieves data anonymity from the sensing stage and battery-free operation for blind spot-free continuous monitoring. Appeared in IPSN 23.

Massiveness is a key to pervasive IoT. OmniScatter is a mmWave tag system that takes a big step towards massive IoT, by scaling up to millions of concurrent tags! Appeared in MobiSys 22 (Best Paper Award winner).

For the first time, SDR-Lite enables commodity WiFi to receive ambient (i.e., non-WiFi) signals. For example, drone signal. SDR-Lite lets typical WiFi to be used as unauthorized UAV detector, spectrum analyzer, and mobile IoT data collector. Appeared in MobiCom 20.

IoT require gateways for the Internet access. GateScatter is the first backscatter-based gateway that converts IoT messages into WiFi packets, for pervasive Internet connectivity. GateScatter works with major commodity IoTs like Samsung SmartThings and Amazon Echo. Appeared in MobiSys 20.

Safeguarding low power IoT (ZigBee) under heavy WiFi interference. This work enables seamless IoT operation even when hundreds of WiFi users are watching YouTube and playing online games. Appeared in SenSys 18.

Communication between different IoT technologies (Bluetooth and ZigBee) using only commercial devices. ZigBee smart lightbulb is controlled with Bluetooth smartphone. This work is a key to ubiquitous computing. Appeared in SenSys 17.

We use commodity WiFi AP to coordinate WiFi and IoT devices, to better utilize the spectrum. This work demonstrates how existing systems (WiFi AP) assist emerging IoT. Appeared in MobiSys 18.