The present invention provides a kind of distributed software defined network (SDN) packet core system, which is configured to support multiple radio access technologies. The distributed system may include a packet core SDN SDN centralized cloud-based infrastructure examples and examples distributed radio access network and a plurality of local SDN nearby radio infrastructure access point. Examples SDN centralized infrastructure-based cloud may not be configured to process delay sensitive network operations. Each local infrastructure SDN examples may include a plurality of computer devices, said plurality of computer devices are configured to perform a plurality of RAT-specific control plane and a plurality of independent modules RAT packet processing module for performing a delay-sensitive network operations .