I am an associate professor in the Department of Computer Science at NCTU, and leading the NEtworking and Mobile Systems (NEMS) laboratory (@ MIRC Building 704) in the department. I received a PhD degree in Computer Science from UCLA, where I was a member of the WiNG group led by Professor Songwu Lu, in 2015. Before that, I received an MS degree in Computer Science from NCTU in 2006, and two Bechelor's degrees in Computer Science and Management Science from NCTU in 2004. My research interests include wireless networking, mobile networks and systems, and network security. Current ongoing projects include Cellular/Wi-Fi IoT security, IMS security, ML-based adaptation for 802.11ac/ax networks, Wireless applications on UAVs, low-latency C-V2X warning delivery, MEC architecture and security, etc. Please download my CV here.
*** I am looking for several Bachelor/Master/Phd research assistants and engineers (Full-time). People who plan to study aboard are very welcome. The employment period is quite flexible (Negotiable). ***
I am looking for self-motivated students (including undergraduate, master, and phd) who want to work on interesting problems in the areas of networking and mobile systems. My ongoing research projects include but not limited to protocol desgins for WiFi networks, security in wireless networking, mobile networks and systems, and network security. The potential students are expected to be willing to learn, to explore, and to code. If you are interested in working with me, please schedule a meeting with me via email.
- Apr. 2020 One paper accepted by IEEE INFOCOM'21: Experience-driven Rate Adaptation.
- Sep. 2020 Our MEC-middlebox testbed was awarded MOST FutureTech Award and MOST FutureTech Best Popularity Award.
- Apr. 2020 One paper accepted by ACM Mobisys'20: Wi-Fi IoT Security.
- Dec. 2019 One paper accepted by ACM MobiCom'20: Ghost Calls from the IMS System.
- Dec. 2019 One paper accepted by IEEE INFOCOM'20: WiGig Beam Fingerprinting for UAV Positioning System.
- Aug. 2019 Our MEC-middlebox testbed was awarded Best Demo Award at Mobile Computing Workshop'19.
- May. 2018 Our Wi-Fi calling paper was awarded Best Paper Award at IEEE CNS'18.
- MOST FutureTech Best Popular Award 2020
- MOST FutureTech Award 2020
- 3-year MOST Grant for Excellent Young Scholar 2020
- Best Paper Award in Taiwan Telecom 2020
- Best Demo Award in Mobile Computing Workshop 2019
- Google Android Security Reward 2019
- Best Paper Award in IEEE CNS 2018
- Facebook Security Reward 2017
- 3-year MOST Grant for Excellent Young Scholar 2017
- MTK Junior Chair Professor Award 2016
An Experience Driven Design for IEEE 802.11ac Rate Adaptation based on Reinforcement Learning
Syuan-Cheng Chen, Chi-Yu Li, Chui-Hao Chiu
The Untold Secrets of WiFi-Calling Services: Vulnerabilities, Attacks, and Countermeasures
Tian Xie, Guan-Hua Tu, Bangjie Yin, Chi-Yu Li, Chunyi Peng, Mi Zhang, Hui Liu, Xiaoming Liu
IEEE Transactions on Mobile Computing (TMC), to appear.
SecWIR: Securing Smart Home IoT Communications via Wi-Fi Routers with Embedded Intelligence
Xinyu Lei, Guan-Hua Tu, Chi-Yu Li, Tian Xie, Mi Zhang
How Can IoT Services Pose New Security Threats in Operational Cellular Networks?
Tian Xie, Guan-Hua Tu, Chi-Yu Li, Chunyi Peng
IEEE Transactions on Mobile Computing (TMC), to appear.
Practical Machine Learning-based Rate Adaptation Solution for Wi-Fi NICs: IEEE 802.11ac as a Case Study
Chi-Yu Li, Syuan-Cheng Chen, Chien-Ting Kuo, Chui-Hao Chiu
IEEE Transactions on Vehicular Technology (TVT), Vol. 69, Issue 9, pp. 10264-10277, Sept. 2020.
Transparent AAA Security Design for Low-latency MEC-integrated Cellular Networks
Chi-Yu Li, Ying-Dar Lin, Yuan-Cheng Lai, Hsu-Tung Chien, Yu-Sheng Huang, Po-Hao Huang, Hsueh-Yang Liu
IEEE Transactions on Vehicular Technology (TVT), Vol. 69, Issue 3, pp. 3231-3243, March 2020.
Ghost Calls from Operational 4G Call Systems: IMS Vulnerability, Call DoS Attack, and Countermeasure
Yu-Han Lu, Chi-Yu Li, Yao-Yu Li, Sandy Hsin-Yu Hsiao, Tian Xie, Guan-Hua Tu, Wei-Xun Chen
WBF-PS: WiGig Beam Fingerprinting for UAV Positioning System in GPS-denied Environments
Pei-Yuan Hong, Chi-Yu Li, Hong-Rong Chang, YuanHao Hsueh, Kuochen Wang
The Dark Side of Operational Wi-Fi Calling Services
Tian Xie, Guan-Hua Tu, Chi-Yu Li, Chunyi Peng, Jaiwei Li, Mi Zhang
IEEE CNS'18. Best Paper Award Google Security Reward
New Security Threats Caused by IMS-based SMS Service in 4G LTE Networks
Guan-Hua Tu*, Chi-Yu Li* (*:Co-Primary), Chunyi Peng, Yuanjie Li, Songwu Lu
ACM CCS'16 Facebook Security Reward
An Energy Efficiency Perspective on Rate Adaptation for 802.11n NIC
Chi-Yu Li, Chunyi Peng, Peng Cheng, Songwu Lu, Xinbing Wang, Fengyuan Ren, Tao Wang
IEEE Transactions on Mobile Computing (TMC), vol. 15, no. 6, p1333-1347, 2016.
Detecting Problematic Control-Plane Protocol Interactions in Mobile Networks
Guan-Hua Tu, Yuanjie Li, Chunyi Peng, Chi-Yu Li, Songwu Lu
IEEE/ACM Transactions on Networking (TON), vol. 24, no. 2, p1209-1222, 2016.
Insecurity of Voice Solution VoLTE in LTE Mobile Networks
Chi-Yu Li, Guan-Hua Tu, Chunyi Peng, Zengwen Yuan, Yuanjie Li, Songwu Lu, Xinbing Wang
Latency-Aware Rate Adaptation in 802.11n Home Networks
Chi-Yu Li, Chunyi Peng, Guan-Hua Tu, Songwu Lu, Xinbing Wang, Ranveer Chandra
Real Threats to Your Data Bills: Security Loopholes and Defense in Mobile Data Charging
Chunyi Peng, Chi-Yu Li, Guan-Hua Tu, Hongyi Wang, Songwu Lu
Control-Plane Protocol Interactions in Cellular Networks
Guan-Hua Tu, Yuanjie Li, Chunyi Peng, Chi-Yu Li, Hongyi Wang, Songwu Lu
Collaborative Energy Save for MIMO 802.11 Wireless Networks
Ioannis Pefkianakis, Chi-Yu Li, Chunyi Peng, Suk-Bok Lee, Songwu Lu
How Voice Calls Affect Data in Operational LTE Networks
Guan-Hua Tu, Chunyi Peng, Hongyi Wang, Chi-Yu Li, Songwu Lu
Accounting for Roaming Users on Mobile Data Access: Issues and Root Causes
Guan-Hua Tu, Chunyi Peng, Chi-Yu Li, Xingyu Ma, Songwu Lu
Mobile Data Charging: New Attacks and Countermeasures
Chunyi Peng, Chi-Yu Li, Guan-Hua Tu, Songwu Lu, Lixia Zhang
Can We Pay for What We Get in 3G Data Access?
Chunyi Peng, Guan-Hua Tu, Chi-Yu Li, Songwu Lu
Energy-based Rate Adaptation for 802.11n
Chi-Yu Li, Chunyi Peng, Songwu Lu, Xinbing Wang
What is Wrong/Right with IEEE 802.11n Spatial Multiplexing Power Save Feature?
Ioannis Pefkianakis, Chi-Yu Li, Songwu Lu