1. A method of admitting a virtual network comprising: receiving, by a processor of a virtual service provider controller from a virtual network operator, a request for admission of a virtual network, the request including at least one indication of geographic and temporal distribution of traffic, as defined for a plurality of regions and a plurality of time periods; transmitting, by the processor of the virtual service provider controller, a request for resources, determined in accordance with the received request for admission, to an infrastructure provider network controller; and in accordance with a reply received in response to the request for resources, transmitting, by the processor of the virtual service provider controller, an admission decision to the virtual network operator.