1. Chonggang Wang, Kazem Sohraby, Victor Lawrence, Bo Li, Yueming Hu4 Dept. Of Elec. Engi., University of Arkansas, Fayetteville, AR 72701, USA Stevens Institute Technology, Hoboken, NJ 07030, USA Dept. of Computer Science, Hong Kong Univ. of Science & Tech., Hong Kong, P.R.China South China Agriculture University, Guangzhou, China Proceedings of the IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing (SUTC’06) Priority-based Congestion Control in Wireless Sensor Networks Presenter : Chun-Kuei Hsiung

2. Outline IntroductionSystem modelsPCCP protocolSimulationConclusions 2015/9/2 2

3. Introduction How to efficiency? Support of QoS Energy Fair throughput – rate-adjustment and packet schedule General CODA and ARC AIMD-like additive increase multiplicative decrease CCF congestion control and fairness But… Just achieve any node have the same throughput to sink. “different sensors or geographically deployed in different place “ need to gain different throughput So PCCP includes Congestion degree Priority-dependent throughput Low buffer occupancy 2015/9/2 3

4. System models Network model 2015/9/2 4

5. System models 2015/9/2 5 Node model Weight Fairness Queuing(WFQ) Weight Round Robin(WRR)

6. PCCP protocol 2015/9/2 6 Priority-based Congestion Control Protocol Components Intelligent congestion detection (ICD) Implicit congestion notification (ICN) Priority-based rate adjustment (PRA) Definition Source traffic priority (SP(i)) Transit Traffic Priority (TP(i)) Global Priority (GP(i)) 1(0) 2(3) 2(0) 2(10) 2(3) 3(0)

7. PCCP protocol - ICD 2015/9/2 7 Indicators Mean packet inter-arrival Mean packet service times Congestion degree Np : a number of new packets arrived TNp : time interval over which the measurements are performed ts’ : service time of the packet just transmitted

8. PCCP protocol - ICN 2015/9/2 8 Trigger events The number of forwarded packets by a node exceed a TH(= O(i)*Np in PCCP) Overhears a congestion notification from its parent

9. PCCP protocol - PRA 2015/9/2 9 Procedure SP(i)

10. Simulation 2015/9/2 10 Simple fairness [2]congestion control and fairness for many-to-one routing in WSN

11. Simulation 2015/9/2 11 Priority-based weighted fairness (2) (1) (3)

12. Simulation 2015/9/2 12 Impact of hop number

13. Conclusion 2015/9/2 13 Properties User packet inter-arrival and service time to accurately measure congestion Node priority index and realizes weighted fairness Simulation result Small buffer size High link utilization and flexible fairness

14. Thank you for your attention~ 2015/9/2 14 Q & A

15. 2015/9/2 15 ICN (Intelligent congestion detection ) ICD (Implicit congestion notification) PRA (Priority-based rate adjustment)