1. A method of designing a radio access network of links between a cellular site and a core network comprising: using a processor to select at least one first link of the radio access network to be at least one first wireless link at least partially based on a linear programming model of the radio access network, wherein the at least one first link is a leased, wireline link; and replacing the at least one first link of the radio access network with the at least one first wireless link, wherein the replacing is at least partially based on a payback period associated with the replacement and a target payback period.