Abstract
This paper studies a 200m×40m greenhouse divided into five 40m×40m cells. To reduce cost, it is important to find the minimum number of Access Points (APs) required for correct operation. A 2% maximum Packet Loss Rate (PLR) is used as a criterion for successful communication between sensors, controller, and actuators. Riverbed simulations are conducted, to indicate that the specific greenhouse under study can safely survive three AP failures provided the remaining two APs are in (or relocated to) specific positions, for optimal coverage. Furthermore, with only one AP in the middle of the greenhouse, the system's performance is marginally acceptable. Another important contribution, of this research, is the proposal of a technique to help system designers manage the suitable balance between system cost (from the point of view of APs) and cost of downtime. System steady state availability is used to measure downtime. Finally, a use case is presented, demonstrating the point of diminishing returns, where investing in more APs was not justified from a cost point of view, with an insignificant impact on steady state availability.
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