• QoS provisioning and resource allocation in wireless networks
  • Multimedia/broadcasting/location-based service in wireless networks
  • Wireless MAC design and analysis for 802.11 WLAN and 802.16 WMAN
  • Congestion control and rate control for future Internet
  • Cross-layer optimization
  • Modeling and performance analysis of communication system


  • Design of MAC protocol for improving area throughput in next-generation WLANs based on IEEE 802.11ax (March 2017 ~ Feb. 2021), Supported by Korea Ministry of Science, ICT and Future Planning
  • Radio resource management for performance enhancement and power saving in device-to-device communication systems based on Wi-Fi Direct (June2013 ~ May 2016),
    Supported by Korea Ministry Education
  • IP R&D Project: Standardization of IEEE 802.11 Wireless LANs (Jan 2013 ~ April 2013),
    Supported by Intellectual Discovery
  • Optimized resource control framework for converged service and MVNO in Mobile WiMAX systems (May 2010 ~ April 2013),
    Supported by Korea Ministry Education, Science, and Technology
  • Cyber and physical system for future worker (Nov 2010 ~ April 2011),
    Supported by POSCO
  • Performance analysis of IEEE 802.16h spectrum sharing (June 2009 ~ Jan. 2010),
    Supported by ETRI
  • QoS enhancement for future wireless networks (March 2009 ~ Feb 2010),
    Supported by Dongguk University