Network virtualization: The missing piece. Intelligence in Next Generation Networks, 2009. ICIN 2009. 13th International Conference on, 1-6, 2009. [PUMA: Cloud_computing Content Content_management Context-aware Context-aware_services Infrastructure Network Network_Virtualization Oriented Platform Platform_virtualization Quality Quality_of_service Real-time Real-time_service_support Resource Resource_management Resource_virtualization Service Service_oriented_architecture Virtualization architecture computing connectivity electronic electronic_messaging exchange integrated integrated_networking interactive interactive_real-time_services layer management message message_exchange messaging network network_connectivity network_virtualization networking quality quality_of_service real-time real-time_systems requirements service service_requirements services support systems telecommunication telecommunication_network_management transport transport_layer virtualization virtualized virtualized_service_platform]