Improved Recovery Management and Routing in W-Grid, a Distributed Infrastructure for Effective and Efficient Multidimensional Data Management over Wireless Ad-Hoc Sensor Networks - Data Management in Cloud, Grid and P2P Systems - page 82

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Fig. 8. Recovery Success Ratio with an Average of 8 Neighbors per Node

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Fig. 9. Recovery Success Ratio with an Average of 12 Neighbors per Node

In Figure 10 we can see that the percentage of successful queries keeps really
high even when the network is in an unstable state due to failed recoveries.

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Fig. 10. Percentage of Successful Queries in the case of Recovery Failure

According to what shown by our experimental analysis (not included in this
paper due to space limitations), the network trac generated by W-Grid active
failure recovery strategies compared with broadcast applied to W-Grid (with
different level of broadcast propagations) expose an appreciable performance.
Indeed, W-Grid heavily reduces the number of messages required for recovery.

8 Conclusions and Future Work

In this paper we presented W-Grid, a fault tolerant cross-layer infrastructure
for routing and multi-dimensional data indexing and querying in ad-hoc sensor
networks. After describing W-Grid we have introduced the new ecient recovery