Research Interests

  • Delay Tolerant Networks
  • Sensor Networks
  • Ad Hoc Wireless Networks
heterogenous sensors

Heterogeneous Sensor Networks
Wireless sensor networks have a significant impact on our daily lives, with applications in target tracking, intelligent homes, environment monitoring, disaster rescuing, self-touring systems, and home health care. According to different application requirements, sensors with various capabilities are deployed. Due to asymmetric and lossy links in heterogeneous sensor networks, we develop new routing methods to deliver messages efficiently to the destination with assured deliver rate at a low cost.


Delay Tolerant Networks
Delay tolerant networks is a type of wireless mobile networks that does not guarantee the existence of a path between a source and a destination at any time. Routing poses unique challenges due to the uncertainty and time-varying nature of network connectivity in delay tolerant networks. We explore novel information model and methods to guide the routing in the right direction. Our algorithms are tested using real-life traces.


Wireless Sensor Networks
Due to the low cost and capabilities of sensors, wireless sensor networks (WSNs) have tremendous potential for military and civilian applications. We work on localization, deployment, energy balancing, fault tolerance, mobility control, routing, privacy preserving, key management issues in wireless sensor networks.

ad hoc network

Ad hoc Wireless Networks
An ad hoc wireless network is a special type of wireless networks in which a collection of mobile hosts with wireless network interfaces can form a termporary network, without the aid of any established infrastructure or centralized administration. It is especially useful in any place where the deployment of basestations is impossible or expensive such as disaster rescues, battlefields, dangerous environment, etc. Communication in ad hoc wireless networks poses special challenges because of low bandwidth, mobility of hosts, and limitation of power. We develop scalable and energy-efficient broadcast and data replication algorithms in this environment.


  • NSF REU site: ``Research Experiences for Undergraduates in Smart & Connected Communities", Senior Personnel, $379,812, 2018-2021.
  • NSF/ICPP-TCPP/CDER Center Early Adopter award, PI, Fall 2015.
  • Travel grant for attending Fed4FIRE-GENI Research Experiment Summit (FGRE 2015) held in Ghent University, Belgium, summer 2015.
  • NSF CC*IIE Networking Infrastructure: Enabling and Improving Data-Driven Research at Texas State University, PI, $499,896, 2014-2016.
  • NSF II-NEW: Shared High Performance Data Center, Co-PI, 10/1/2013-10/1/2016, $375,759.
  • NSF REU on Mobile Cyber-Physical Systems, Senior Personnel, $340k, 2012-2015.
  • NSF REU supplement grant to CNS 0835834, $16k, 2009-2010.
  • NSF CNS 0835834, A Novel Information Model for Efficient Routing Protocols in Delay Tolerant Networks with General Mobility, Co-PI, $60k, 2008-2010.
  • Library Research Grant, Texas State, PI, $1415, 2008.
  • Travel grant for attending IEEE MASS held in Washington DC, 2005.
  • Texas State REP, Secure Group Key Distribution Protocols for Multicast Communication, PI, $8k, 2002-2003.
  • Texas State REP, Fault-Tolerant Routing Design using a Self-Stablizing Information Model in Grid-Based networks, PI, $8k, 2000-2001.
  • Texas State REP, A Self-Stablizing Information Model in Grid-Based Networks, PI, $8k, 1999-2000.
  • Summer research grant, PI, Texas State, $2000, 2000.
  • Travel grant for attending IEEE International Symposium on Fault-Tolerant Computing held in Madison, Wisconsin, 1999.

Invited Talks

  • Invited talk in the Department of Computer & Information Sciences, Temple University, Pennslyvania, Oct. 2011.
  • Invited talk in the College of Computer Science, Nanjing University of Posts and Telecommunications, Nanjing, China, January 2010.
  • Invited talk in the Department of Computer Science and Technology, Nanjing University, Nanjing, China, January 2010 and 2009.
  • Invited talk in the College of Information Engineering, Chengdu Institute of Technology, Chengdu, China, May 2004.
  • Invited talk at DIMACS center on "Multicasting: Architecture, Algorithms, and Applications", Rutgers University, New Jersey, May 2001.