  In this paper, we study delayed regulated state/output synchronization for
discrete-time homogeneous and heterogeneous networks of multi-agent systems
(MAS) subject to unknown, non-uniform and arbitrarily large communication
delays. A delay transformation is utilized to transform the original MAS to a
new system without delayed states. The proposed scale-free dynamic protocols
are developed solely based on agent models and localized information exchange
with neighbors such that we do not need any information about the communication
networks and the number of agents.
