In this step, the proposed approach operates in the first round (r=0), a set of sub-networks in a wind farm, which buildups the smallest convex hull that includes other sub- networks. Assuming the sub-networks is regarded as terminals, the convex hull of all sub-networks and Base-station Node is utilized to determine boundary sub-networks. Additionally, at least three non-collinear sub-networks are assumed, and then the convex hull CH0 can be confirmed and formed a closed polygon by the Graham algorithm [22].