  To solve the problem of power supply limitation of machines working in
wireless industry automation, we evaluated the workload aware service rate
control design implanted in the medium access control component of these small
devices and proposed a bio-intelligence based algorithm to optimise the design
regarding the delay constraint while minimizing power consumption. To achieve
this, we provide an accurate analysis of the delay cost of this design and for
the first time pinpoint an exact departure process model in order to evaluate
the overall delay cost in consideration of the medium access time.
