Research

Current research topics include heterogeneous and femtocell-overlaid cellular networks, wireless ad hoc networks, CSMA and RTS/CTSmechanism in 802.11, energy-efficient network, stochastic geometry, point process theory. Specific interests include:

• Stability of interacting queues in random network: Combined the queue theory and the Poisson point process framework to analyze the random network. Obtained the sufficient condition and necessary condition for stability of the overall random network.

• Interference correlation and delay in ad hoc network: Explored the difference between frequency splitting and ALOHA in reducing interference correlation by introducing local delay as metric.

• Interference for CSMA protocol with RTS/CTS mechanism: Proposed a novel hard-core point process to model the spatial distribution of the interferers for CSMA protocol with RTS/CTS mechanism. Derived the accurate expressions for mean interference.

• Separation architecture in energy-efficient cellular network: Evaluated the energy saving by introducing separation architecture (separation of coverage BS and traffic BS) in energy-efficient cellular network.

• Resource allocation for hybrid access femtocell: Modeled the hybrid access mechanism in heterogeneous cellular networks with either randomly distributed or clustered femtocells. Evaluated the tradeoff of sub-channels allocation between subscribers and nonsubscribers.

• Interference Management for eIMTA in TD-LTE: Evaluated the interference and capacity for dynamic TDD through system level simulation and proposed a distributed algorithm based on BS-BS interference measurement to mitigate the interference.