Patent ID: 11910492
Assignee: NEC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A communication system comprising:
at least a first data center providing a cloud service to a user, wherein the first data center comprises:
a first virtual network that provides a communication service in cooperation with at least a part of a communication facility of at least a first communication operator rented by a mobile virtual communication operator from the first communication operator; and
a first communication unit that includes at least a processor controlling to communicate with a second communication unit in a second data center, the first and second data centers provided by the mobile virtual communication operator,
wherein the processor of the first communication unit controls to transmit, to the second communication unit, communication data to be transmitted from a first terminal of a first user contracting with the mobile virtual communication operator and connecting to the first virtual network via the communication facility rented by the mobile virtual communication operator from the first communication operator to a second terminal connecting via a communication facility of a second communication operator rented by the mobile virtual communication operator from the second communication operator to a second virtual network in the second data center, the second virtual network providing a communication service in cooperation with at least a part of the communication facility rented by the mobile virtual communication operator from the second communication operator,
wherein in the first data center, the processor of the first communication unit in response to a connection request from the first terminal to connect to the second virtual network in the second data center, receives an inquiry issued from the second virtual network,
the processor of the first communication unit checks whether the first terminal is registered in a storage unit of the first communication unit, and
if the first terminal is registered in the storage unit, the processor of the first communication unit allows the first terminal to connect to the second virtual network and start communication by roaming of the first terminal.