1. Adaptive energy-efficient registration and online scheduling for asymmetric wireless sensor networks Authors : Saravanan Balasubramanian, Demet Aksoy Published : Computer Networks Speaker : Wen-Chuan Huang

2. Outline Introduction Introduction AEROS AEROS Message format Message format Channel division Channel division Control message Control message Experiments Experiments Conclusions Conclusions

3. Introduction

4. Goal propose a novel and adaptive sensor registration and scheduling protocol enable adaptive routing paths towards the data collection points minimize the data transmissions such that each observation is transmitted only once per node using collision-free scheduling that is enabled even while the network is organizing The chances of data aggregation during routing is maximized

5. Message format (temperature, 4, 3, 1, 3, 2, 5, 2, 2) (temperature, 3, 5, 1, 2, 2, 4, 2, 3) (temperature, 3.375, 8, 1, 2, 2, 5, 2, 3) 屬性 感測值感測數量事件範圍持續時間 (4*3+3*5)/(3+5) 3+5

6. Channel division

7. In control channel Snoop state advertise subscribe schedule deregister

8. Scheduling Message type Message type Request Request Request-Ack Request-Ack Request-Nack Request-Nack Channel status Channel status FREE FREE CAN RECEIVE ONLY CAN RECEIVE ONLY NEIGHBOR USE NEIGHBOR USE SUBSCRIBER RECEIVE SUBSCRIBER RECEIVE TRANSMIT TRANSMIT

10. Energy consumption

11. Experiments

19. Conclusions Divide the communication medium into separate control and data channels Data communications take place on independent data channels that are organized to be collision-free Minimize the data communications and to improve the chances of data aggregation during data collection

20. Q&A