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Cross-Layer Caching Based Optimization for Wireless Multimedia Sensor Networks
1. Cross-Layer Caching Based
Optimization for Wireless
Multimedia Sensor Networks
Nestor Tiglao and António Grilo
INESC-ID/IST, Lisbon, Portugal
2. Outline
Introduction
Related Work
Proposed Mechanisms
Results
Conclusion and future work
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3. Introduction
WSN equipped with multimedia sensors give
birth to WMSN
They enable a new class of monitoring
applications, but demanding in terms of:
computational resources
energy resources
Need for innovative solutions:
combination/optimization techniques at
the different layers of the protocol stack
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4. Related Work
Pump Slowly Fetch Quickly (PSFQ)
Designed for dynamic code update, no real-time
performance guarantees
Distributed TCP Caching (DTC)
Intermediate retransmission based on ACK/SACK
semantic
Reliable Multi-Segment Transport (RMST)
Uses timer-based NACK repair
Tunable Reliability with Congestion Control for
Information Transport (TRCCIT)
Uses MAC retry limit adaptation but considers end-
to-end application reliability
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5. Analytical Model
N. M. C. Tiglao and A. M. Grilo, “An analytical model
for transport layer caching in wireless sensor
networks,” Performance Evaluation, vol. 69, no. 5,
pp. 227–245, 2012. [Online]. Available:
http://www.sciencedirect.com/science/article/pii/S0
166531611001568
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18. Conclusion and Future Work
Ensemble of MAC and transport layer
optimization provides better performance
over non-optimized protocols
Mechanisms are simple and generic enough
for adoption by other transport protocols
Future work: more complex and dynamic
scenarios
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19. Thank you for your attention!
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