D A C B Radio Irregularity

Radio irregularity Radio irregularity is a common phenomenon which arises from multiple factors, such as variance in RF sending power and different path losses depending on the direction of propagation. It is the first headache for most researchers who plan to build a running sensor network system. In this project, we investigate the impact of radio irregularity on wireless sensor networks. With empirical data obtained from real sensor devices, we establish a radio model for simulation, called the Radio Irregularity Model (RIM), which is the first to bridge the discrepancy between spherical radio models used by simulators and the physical reality of radio signals. With this model, we investigate the impact of radio irregularity on several upper layer protocols, including MAC, routing, localization and topology control. We also present eight solutions to deal with radio irregularity in running systems. This research has been reported in MobiSys 04Research papers from this project have been adopted as graduate course materials in universities, including

QoS for Body Networks

f7 A 2450MHz f5 f5 B 2470MHz f0 2460MHz f2 D f2 C Frequency Diversity

Radio Interference

Military Surveillance