  This paper introduces a wireless communication protocol for industrial
control systems that uses channel quality awareness to dynamically create
network-device cooperation and assist the nodes in momentary poor channel
conditions. To that point, channel state information is used to identify nodes
with strong and weak channel conditions. We show that strong nodes in the
network are best to be served in a single-hop transmission with transmission
rate adapted to their instantaneous channel conditions. Meanwhile, the
remainder of time-frequency resources is used to serve the nodes with weak
channel condition using a two-hop transmission with cooperative communication
among all the nodes to meet the target reliability in their communication with
the controller. We formulate the achievable multi-user and multi-antenna
diversity gain in the low-latency regime, and propose a new scheme for
exploiting those on demand, in favor of reliability and efficiency. The
proposed transmission scheme is therefore dubbed adaptive network-device
cooperation (ANDCoop), since it is able to adaptively allocate cooperation
resources while enjoying the multi-user diversity gain of the network. We
formulate the optimization problem of associating nodes to each group and
dividing resources between the two groups. Numerical solutions show significant
improvement in spectral efficiency and system reliability compared to the
existing schemes in the literature. System design incorporating the proposed
transmission strategy can thus reduce infrastructure cost for future private
wireless networks.
