We consider a heterogeneous (also called "hybrid") ad-hoc network with wired and wireless links. This type of network was previously considered by Kulkarni and Viswanath in  where achievable transport capacity growth rates were demonstrated for a structured wired infrastructure. The present paper improves on this work by demonstrating that efficiency can be increased significantly if the wired links are introduced at random.
"A "Small World" Approach to Heterogeneous Networks." Commun. Inf. Syst. 3 (4) 325 - 348, 2003.