Part 2: Understanding Trade-Offs in SmartMesh IP
- Thomas Watteyne
Goal
Understand how latency, data rate and energy trade off for one another.
The "Dust Networks SmartMesh Power and Performance Estimator" (http://www.linear.com/docs/42452) is a Excel-based tool which allows you to evaluate the performance of your network, given a set of constraints.
Download and open the performance estimator.
You will find the documentation of the performance estimator at http://cds.linear.com/docs/en/application-note/SmartMesh_IP_Application_Notes.pdf (Section 23.3, p.131).
In newer versions of Excel, you might have to enable the contents to be able to run the estimator.
In the "Estimator" tab, enter parameters corresponding to the setup in your group. What setting did you use?
What is the resulting estimated performance of your nodes?
Using the "Battery Life" tab, convert the average current consumption figures in the table above into lifetime, for the following batteries:
Change the parameters to match a typical use case for an industrial process monitoring application:
number of motes per depth
40 (1-hop), 30 (2-hop), 20 (3-hop), 10 (4-hop)
requested service 60 seconds reporting interval
60 seconds
payload size
10 bytes
path stability
75%
supply voltage
3.6
temperature
40 C
battery
TL9530D
What is the estimated performance now?