Before revision:  This occurs because a balance is achieved between the number of users requesting connections and those that are already admitted to the network  .
After revision:  This occurs because a balance is achieved between the number of users requesting connections and those that are already admitted to the network . We also present an extension of our analytical model to a multi-cell network (by means of an approximation) and an application of the proposed load balancing scheme in the context of opportunistic spectrum access .