Image Processing Reference
In-Depth Information
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FIGURE .
SPIN protocol. (a) Node A advertises its data to node B. (b) Node B in response sends a request to
node A. (c) Node A sends the requested data to node B. (d) Node B sends an advertisement to (ADV) to its neighbors.
(e) he interested nodes respond with request messages. (f) Data is transmitted by node B. (Redrawn from Kulik, J.,
Rabiner, W., and Balakrishnan, H., Adaptive protocols for information dissemination in wireless sensor networks, in
Proceedings of the th Annual ACM/IEEE InternationalConferenceonMobileComputingandNetworking
,pp.-,
.)
resource adaptation. In SPIN each sensor node features a resource manager that keeps track of power
consumption and triggers energy-aware behavior.
SPIN does not specify a standard metadata format, as it is application-speciic. However, as meta-
data exchange is done before data transmission, in order to maintain energy efficiency the size of
metadata should be significantly less than that of sensor data.
Three types of messages are introduced by SPIN protocols.
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ADV messages, which allow a sensor to advertise that a node has data to share. This
message contains the metadata used to identify the sensor data.
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REQ messages, which allow a node to request specific data.
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DATA messages, which contain the actual sensor data.
hebasicfunctioningoftheSPINprotocolsisrepresentedinFigure..
