Wireless LAN is considered having mode Ad-hoc \"point-to-point\", consisting of an information maintenance device, wireless radio channel and stations divided into 3 subnets different for the intensity of incoming message. Physical structure of the network under consideration and timing diagrams of its subnets have been developed. Basing on Laplace transform analytical models of service and information delivery processes at the subnets have been developed. Methods for calculating probability-time characteristics of the subnets and in the network as a whole have been proposed.