Changeset 2796

Timestamp:

10/30/09 17:42:53 (4 weeks ago)

Author:

jaein

Message:

 

Files:

• HydroWatch/Tim/doc/ipsn10/sec_intro.tex (modified) (1 diff)

HydroWatch/Tim/doc/ipsn10/sec_intro.tex

@@ -26 +26 @@
 
 
-An obvious way to reduce the amount of energy consumed by idle listening is to turn the radio off. Whilst the allows a large amount of energy to be redistributed to tasks such as sampling and sending (when the radio is switched on again), this approach allows incurs an additional network overhead each time the radios are turned back on in where network routing tables must be reformed and [other things?]. Figure~\ref{fig:energy}(c) illustrates the nature of this additional cost, showing the relationship between time the radios are off and the effective energy consumed per bit of data transmitted. Once radios are off long enough, the effect of amortizing the cost of updating the network state over long periods becomes clear where in these cases the net energy cost is less than a typical low-power listening (LPL) MAC \cite{lpl04sensys}. 
+An obvious way to reduce the amount of energy consumed by idle listening is to turn the radio off. Whilst the allows a large amount of energy to be redistributed to tasks such as sampling and sending (when the radio is switched on again), this approach incurs an additional network overhead each time the radios are turned back on in where network routing tables must be reformed and [other things?]. Figure~\ref{fig:energy}(c) illustrates the nature of this additional cost, showing the relationship between time the radios are off and the effective energy consumed per bit of data transmitted. Once radios are off long enough, the effect of amortizing the cost of updating the network state over long periods becomes clear where in these cases the net energy cost is less than a typical low-power listening (LPL) MAC \cite{lpl04sensys}. 
 
-The other key trade-off in turning off radios is that of network responsiveness. Once nodes only become active in scheduled intervals then the times a user can communicate with nodes, or the times which nodes can report to a base a now constrained. This has clear implications for event-driven applications or query-based systems, where a user may want an immediate responsive from the network.
+The other key trade-off in turning off radios is that of network responsiveness. Once nodes only become active in scheduled intervals then the times a user can communicate with nodes, or the times which nodes can report to a base are now constrained. This has clear implications for event-driven applications or query-based systems, where a user may want an immediate responsive from the network.
 
 \subsection{Motivation}~\label{sec:motivation}