Challenges for MAc in WSNs a 6. Inaccurate Clock Crystals Cheap node requirement prevents expensive crystals to be implemented Synchronization problems a TDMA-based schemes are not practical 7. Event-based Networking Observed data depends on physical phenomenon Spatial and temporal correlation in the physical phenomenon should be exploited BOTTOMLINE: Existing MAC protocols cannot be used for WSNs!!! CS5602: Principles and Techniques for Sensors and Information PerceptionChallenges for MAC in WSNs ▪ 6. Inaccurate Clock Crystals ▪ Cheap node requirement prevents expensive crystals to be implemented ▪ Synchronization problems ▪ TDMA-based schemes are not practical ▪ 7. Event-based Networking ▪ Observed data depends on physical phenomenon ▪ Spatial and temporal correlation in the physical phenomenon should be exploited CS5602: Principles and Techniques for Sensors and Information Perception 10 BOTTOMLINE: Existing MAC protocols cannot be used for WSNs!!!