Communication system, communication control apparatus, and communication control method

1 . A communication system comprising:

base station apparatuses; and

a communication control apparatus that provides a roaming service in disaster roaming,

the communication control apparatus including at least one first processor, the at least one first processor carrying out

a storage process of storing, for each of the base station apparatuses, a maximum number of acceptable subscribers for each of roaming requester telecommunications carriers that receive the roaming service, and

a notification process of notifying the base station apparatus of the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers,

each of the base station apparatuses including at least one second processor, the at least one second processor carrying out

a reception process of receiving the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers from the communication control apparatus,

a permission process of permitting a new connection request from a terminal apparatus in a case where the new connection request is a connection request from a subscriber terminal of a host telecommunications carrier that provides the roaming service,

a determination process of determining, in a case where a new connection request from a terminal apparatus is a connection request from a subscriber terminal of a roaming requester telecommunications carrier, whether or not to permit the new connection request based on a maximum number of acceptable subscribers corresponding to the roaming requester telecommunications carrier, and

a calculation process of calculating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers from a number of acceptable subscribers for each of the base station apparatuses, a number of subscribers to be accepted in roaming which is included in contract conditions between the host telecommunications carrier and the roaming requester telecommunications carrier, and the number of acceptable subscribers of a core network, and storing the maximum number of acceptable subscribers which has been calculated,

wherein the maximum number of acceptable subscribers is a maximum value of the number of subscribers of the roaming requester telecommunications carrier that is configured to be accepted by a communication system operated by the host telecommunications carrier in the disaster roaming.

2 . The communication system according to claim 1 , wherein:

in the determination process, in a case where the number of connections of subscriber terminals of a roaming requester telecommunications carrier exceeds a corresponding maximum number of acceptable subscribers due to a new connection request from a subscriber terminal of the roaming requester telecommunications carrier, the at least one second processor rejects the new connection request.

3 . The communication system according to claim 1 , wherein:

in the notification process, when starting acceptance of disaster roaming, the at least one first processor provides a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers.

4 . The communication system according to claim 1 , wherein:

in the notification process, the at least one first processor provides a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers according to the number of new connection requests from subscriber terminals of the roaming requester telecommunications carrier.

5 . A communication control apparatus for controlling provision of a roaming service in disaster roaming, said communication control apparatus comprising at least one processor, the at least one processor carrying out:

a storage process of storing, for each of base station apparatuses, a maximum number of acceptable subscribers for each of roaming requester telecommunications carriers which receive the roaming service;

a notification process of notifying the base station apparatus of the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers; and

a calculation process of calculating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers from a number of acceptable subscribers for each of the base station apparatuses, a number of subscribers to be accepted in roaming which is included in contract conditions between the host telecommunications carrier and the roaming requester telecommunications carrier, and the number of acceptable subscribers of a core network, and storing the maximum number of acceptable subscribers which has been calculated,

wherein the maximum number of acceptable subscribers is a maximum value of the number of subscribers of the roaming requester telecommunications carrier that is configured to be accepted by a communication system operated by the host telecommunications carrier in the disaster roaming.

6 . The communication control apparatus according to claim 5 , wherein:

in the notification process, when starting acceptance of disaster roaming, the at least one processor provides a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers.

7 . The communication control apparatus according to claim 5 , wherein:

in the notification process, the at least one processor provides a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers according to the number of new connection requests from subscriber terminals of the roaming requester telecommunications carrier.

8 . A communication control method in a communication system including base station apparatuses and a communication control apparatus that provides a roaming service in disaster roaming, said communication control method comprising:

storing a maximum number of acceptable subscribers for each of roaming requester telecommunications carriers that receive the roaming service;

notifying the base station apparatus of the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers;

permitting a new connection request from a terminal apparatus in a case where the new connection request is a connection request from a subscriber terminal of a host telecommunications carrier that provides the roaming service;

determining, in a case where a new connection request from a terminal apparatus is a connection request from a subscriber terminal of a roaming requester telecommunications carrier, whether or not to permit the new connection request based on a maximum number of acceptable subscribers corresponding to the roaming requester telecommunications carrier;

calculating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers from a number of acceptable subscribers for each of the base station apparatuses, a number of subscribers to be accepted in roaming which is included in contract conditions between the host telecommunications carrier and the roaming requester telecommunications carrier, and the number of acceptable subscribers of a core network; and

storing the maximum number of acceptable subscribers which has been calculated, wherein the maximum number of acceptable subscribers is a maximum value of the number of subscribers of the roaming requester telecommunications carrier that can is configured to be accepted by a communication system operated by the host telecommunications carrier in the disaster roaming.

9 . The communication control method according to claim 8 , wherein:

in the determining, in a case where the number of connections of subscriber terminals of a roaming requester telecommunications carrier exceeds a corresponding maximum number of acceptable subscribers due to a new connection request from a subscriber terminal of the roaming requester telecommunications carrier, the new connection request is rejected.

10 . The communication control method according to claim 8 , wherein:

in the notifying, when starting acceptance of disaster roaming, a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers is provided.

11 . The communication control method according to claim 8 , wherein:

in the notifying, a notification indicating the maximum number of acceptable subscribers for each of the roaming requester telecommunications carriers is provided according to the number of new connection requests from subscriber terminals of the roaming requester telecommunications carrier.