Communication system, mobile device, and network apparatus

A communication system which includes a mobile device connectable to a first radio communication system and a second radio communication system of radio access technology different from that of the first radio communication system, and

• a network apparatus controlling mobility of the mobile device between the first radio communication system and the second radio communication system, wherein
• when the mobile device sends the network apparatus a request for connection to the second radio communication system instead of the first radio communication system because the first radio communication system imposes access restriction to restrict communication performed by the mobile device, the mobile device incorporates incapability information in the request for connection, the incapability information indicating that the mobile device is incapable of executing communication through the first radio communication system, and
• when acquiring the incapability information from the mobile device, the network apparatus restrains the mobile device from handing over to the first radio communication system.

A communication system which includes a mobile device connectable to a first radio communication system and a second radio communication system having radio access technology different from that of the first radio communication system, and

• a network apparatus controlling mobility of the mobile device between the first radio communication system and the second radio communication system, wherein
• when the mobile device sends the network apparatus a request for connection to the second radio communication system instead of the first radio communication system because the first radio communication system imposes access restriction to restrict communication performed by the mobile device, the mobile device incorporates access restriction information in the request for connection, the access restriction information indicating that the request for connection to the second radio communication system is made due to the access restriction in the first radio communication system, and
• when acquiring the access restriction information from the mobile device, the network apparatus restrains the mobile device or a mobile device other than the mobile device from handing over to the first radio communication system.

A mobile device connectable to a first radio communication system and a second radio communication system of radio access technology different from that of the first radio communication system, wherein

• when the mobile device sends the network apparatus a request for connection to the second radio communication system instead of the first radio communication system, the mobile device incorporates mobility information in the request for connection, the mobility information indicating that the mobile device hands over from first radio communication system.

A mobile device connectable to a first radio communication system and a second radio communication system of radio access technology different from that of the first radio communication system, wherein

• when the mobile device sends the network apparatus a request for connection to the second radio communication system instead of the first radio communication system, the mobile device incorporates incapability information in the request for connection, the incapability information indicating that the mobile device is incapable of executing communication through the first radio communication system.

A mobile device connectable to a first radio communication system and a second radio communication system having radio access technology different from that of the first radio communication system, wherein

• when the mobile device sends the network apparatus a request for connection to the second radio communication system instead of the first radio communication system because the first radio communication system imposes access restriction to restrict communication performed by the mobile device, the mobile device incorporates access restriction information in the request for connection, the access restriction information indicating that the request for connection to the second radio communication system is made due to the access restriction in the first radio communication system.

A network apparatus which controls mobility of a mobile device between a first radio communication system and a second radio communication system of radio access technology different from that of the first radio communication system, wherein

• when acquiring, from the mobile device, mobility information indicating that mobility from the first radio communication system is performed, the network apparatus restrains the mobile device or a mobile device other than the mobile device from handing over to the first radio communication system.

A network apparatus which controls mobility of a mobile device between a first radio communication system and a second radio communication system having radio access technology different from that of the first radio communication system, wherein

• when acquiring, from the mobile device, incapability information indicating that the mobile device is incapable of executing communication through the first radio communication system, the network apparatus restrains the mobile device from handing over to the first radio communication system.

A network apparatus which controls mobility of a mobile device between a first radio communication system and a second radio communication system having radio access technology different from that of the first radio communication system, wherein

• when acquiring, from the mobile device, access restriction information indicating that a request for connection to the second radio communication system is made due to access restriction in the first radio communication system, the network apparatus restrains the mobile device or a mobile device other than the mobile device from handing over to the first radio communication system.