|Speaker :||Rémy Leone|
|Time:||2:30 pm - 3:00 pm|
|Location:||LINCS Meeting Room 40|
This paper addresses monitoring and surveillance applications using Wireless Sensors Networks (WSN). In this context, several remote clients are interested in receiving the information collected by the nodes in a WSN. As WSN devices are most of the time constrained in energy and processing, we present a caching architecture that will help reducing unnecessary communications and adapting the network to application needs.
Our aim here is to cache information in order to improve the overall network lifetime, while meeting equirements of external application in terms information freshness. We first describe and evaluate the performance of our caching system within the framework of a Constrained Application Protocol (CoAP) proxy. We then extend this work by showing how the cache could be enriched and exploited with cross-layer data. Based on information from routing packets and estimation updates of nodes power consumption, we derive an optimization strategy which allows to meet requirements on the freshness of the cached values.