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

Claim 6:
7. A communication method comprising:
providing, by a first data center, a cloud service, by using a first virtual network that provides a communication service in cooperation with at least a part of a communication facility of a first communication operator rented by a mobile virtual communication operator from the first communication operator;
controlling, by a first communication unit included in the first data center, to communicate with a second communication unit included in a second data center that provides a cloud service, wherein the second data center includes a second virtual network that provides a communication service in cooperation with at least a part of a communication facility of a second communication operator rented by the mobile virtual communication operator from the second communication operator, the first and second data centers provided by the mobile virtual communication operator;
communicating data from a first terminal subscribing to the mobile virtual communication operator and connecting via the communication facility of the first communication operator to the first virtual network in the first data center, being transmitted via the first communication unit of the first data center and via the second communication unit of the second data center, to a second terminal connecting via the communication facility of the second communication operator rented by the mobile virtual communication operator from the second communication operator to the second virtual network in the second data center,
wherein in the first data center, in response to a connection request from the first terminal to connect to the second virtual network in the second data center, receiving an inquiry issued from the second virtual network;
checking whether the first terminal is registered in a storage unit of the first data center; and
if the first terminal is registered in the storage unit, allowing the first terminal to connect to the second virtual network, to start communication by roaming of the first terminal.