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TTDD: A Two-tier Data Dissemination Model for Large-scale Wireless Sensor Networks

TTDD: A Two-tier Data Dissemination Model for Large-scale Wireless Sensor Networks. Haiyun Luo Fan Ye, Jerry Cheng Songwu Lu, Lixia Zhang UCLA CS Dept. Outline. Data dissemination to mobile sinks Two-tier query and data forwarding Performance evaluation Related work Conclusion. Sink.

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TTDD: A Two-tier Data Dissemination Model for Large-scale Wireless Sensor Networks

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  1. TTDD: A Two-tier Data Dissemination Model for Large-scale Wireless Sensor Networks Haiyun Luo Fan Ye, Jerry Cheng Songwu Lu, Lixia Zhang UCLA CS Dept.

  2. Outline • Data dissemination to mobile sinks • Two-tier query and data forwarding • Performance evaluation • Related work • Conclusion TTDD @ MOBICOM'02

  3. Sink Sink Sensor Network Model Stimulus Source TTDD @ MOBICOM'02

  4. Mobile Sink Excessive Power Consumption Increased Wireless Transmission Collisions State Maintenance Overhead TTDD @ MOBICOM'02

  5. Challenges • Battery powered sensor nodes • Communication via wireless links • Bandwidth constraint • Load balancing • Ad-hoc deployment in large scale • Fully distributed w/o global knowledge • Large numbers of sources and sinks • Unexpected sensor node failures • Sink mobility • No a-priori knowledge of sink movement TTDD @ MOBICOM'02

  6. Goal, Idea • Efficient and scalable data dissemination from multiple sources to multiple, mobile sinks • Two-tier forwarding model • Source proactively builds a grid structure • Localize impact of sink mobility on data forwarding • A small set of sensor node maintains forwarding state TTDD @ MOBICOM'02

  7. Source Sink TTDD Basics Dissemination Node Data Announcement Data Query Immediate Dissemination Node TTDD @ MOBICOM'02

  8. Source Sink Trajectory Forwarding TTDD Mobile Sinks Dissemination Node Trajectory Forwarding Data Announcement Immediate Dissemination Node Data Immediate Dissemination Node TTDD @ MOBICOM'02

  9. Source Source TTDD Multiple Mobile Sinks Dissemination Node Trajectory Forwarding Data Announcement Immediate Dissemination Node Data TTDD @ MOBICOM'02

  10. Grid Maintenance • Issues: • Handle unexpected dissemination node failures • Efficiency • Solutions: • Source sets the Grid Lifetime in Data Announcement • DN replication: each DN recruits several sensor nodes from its one-hop neighbor, replicates the location of the upstream DN • DN failure detected and replaced on-demand by on-going query and data flows TTDD @ MOBICOM'02

  11. Source Grid Maintenance Dissemination Node X Immediate Dissemination Node Data TTDD @ MOBICOM'02

  12. Source Grid Maintenance (cont’d) Dissemination Node X Immediate Dissemination Node Data TTDD @ MOBICOM'02

  13. Performance Evaluation • Compare with sink-oriented data dissemination approaches • Communication overhead • State maintenance complexity TTDD @ MOBICOM'02

  14. Ns-2 Simulation • Metrics • Energy consumption, delay, success rate • Impacts of • Cell size • Number of sources and sinks • Sink mobility • Node failure rates TTDD @ MOBICOM'02

  15. Related Work • SPIN (Mobicom 1999) • Data dissemination to all sensor nodes • Directed Diffusion, DRP, GRAB (2000) • Flat dissemination structure, stationary sinks • GAF (Mobicom 2001) • Turn off redundant nodes in MANET • Pre-defined grid, cell size determined by radio • Ad hoc network clustering • Node mobility causes high infrastructure maintenance overhead TTDD @ MOBICOM'02

  16. Conclusion • TTDD: two-tier data dissemination Model • Exploit sensor nodes being stationary and location-aware • Construct & maintain a grid structure with low overhead • Proactive sources • Localize sink mobility impact • Infrastructure-approach in stationary sensor networks • Efficiency & effectiveness in supporting mobile sinks TTDD @ MOBICOM'02

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