  Some of the new trends emerging in future wireless networks enable a vastly
increased fluidity in accessing a wide range of resources, thus supporting
flexible network composition and dynamic allocation of resources to virtual
network operators (VNOs). In this work we study a new resource allocation
opportunity that is enabled by the cloud radio access network architecture. In
particular, we investigate the relationship between the cloud-based antennas
and spectrum as two important resources in virtualized wireless networks. We
analyze the interplay between spectrum and antennas in the context of an
auction-based allocation mechanism through which VNOs can bid for a combination
of the two types of resources. Our analysis shows that the complementarity and
partial substitutability of the two resources significantly impact the results
of the allocation of those resources and uncovers the possibility of divergent
interests between the spectrum and the infrastructure providers.
