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Priority-based Congestion Control in Wireless Sensor Networks

Priority-based Congestion Control in Wireless Sensor Networks. 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

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Priority-based Congestion Control in Wireless Sensor Networks

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  1. Priority-based Congestion Control in Wireless Sensor Networks 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) Presenter : Chun-Kuei Hsiung

  2. Outline

  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

  4. System models • Network model

  5. System models • Node model • Weight Fairness Queuing(WFQ) • Weight Round Robin(WRR)

  6. PCCP protocol • 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)) 2(0) 2(3) 2(10) 1(0) 2(3) 3(0)

  7. PCCP protocol-ICD • 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 • 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 • Procedure SP(i)

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

  11. Simulation • Priority-based weighted fairness (1) (3) (2) (1) (1) (1) (1)

  12. Simulation • Impact of hop number

  13. Conclusion • 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. Q & A Thank you for your attention~

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