Mobile communications method, mobile management node and radio base station

A mobile management node used in a mobile communication system, the mobile communication system being configured such that a first mobile station and a second mobile station can transmit and receive a data signal through an inter-mobile station interface without a radio base station interface, the inter-mobile station interface being set between the first mobile station and the second mobile station, the radio base station interface being set between a radio base station and the first mobile station and the second mobile station, the mobile management node comprising:

• a generator that is configured to generate an inter-mobile station communication key using a first access security management key and a second access security management key, the inter-mobile station communication key being used in security of the data signal transmitted and received through the inter-mobile station interface, the first access security management key being managed only by the mobile management node and the first mobile station, the second access security management key being managed only by the mobile management node and the second mobile station;
• and
• a transmission unit that is configured to transmit the inter-mobile station communication key to the first mobile station and the second mobile station.

A radio base station used in a mobile communication system, the mobile communication system being configured such that a first mobile station and a second mobile station can transmit and receive a data signal through an inter-mobile station interface without a radio base station interface, the inter-mobile station interface being set between the first mobile station and the second mobile station, the radio base station interface being set between the radio base station and the first mobile station and the second mobile station, the radio base station comprising:

• a generator that is configured to generate an inter-mobile station communication key using a first radio base station key and a second radio base station key, the inter-mobile station communication key being used in security of the data signal transmitted and received through the inter-mobile station interface, the first radio base station key being managed only by the radio base station and the first mobile station, the second radio base station key being managed only by the radio base station and the second mobile station;
• and
• a transmission unit that is configured to transmit the inter-mobile station communication key to the first mobile station and the second mobile station.

A mobile management node used in a mobile communication system, the mobile communication system being configured such that a first mobile station and a second mobile station can transmit and receive a data signal through an inter-mobile station interface without a radio base station interface, the inter-mobile station interface being set between the first mobile station and the second mobile station, the radio base station interface being set between a radio base station and the first mobile station and the second mobile station, the mobile management node comprising:

• a generator that is configured to generate a first parameter and a second parameter to generate an inter-mobile station communication key using a first access security management key and a second access security management key, the inter-mobile station communication key being used in security of the data signal transmitted and received through the inter-mobile station interface, the first access security management key being managed only by the mobile management node and the first mobile station, the second access security management key being managed only by the mobile management node and the second mobile station;
• and
• a transmission unit that is configured to, transmit the first parameter to the first mobile station and to transmit the second parameter to the second mobile station.

A radio base station used in a mobile communication system, the mobile communication system being configured such that a first mobile station and a second mobile station can transmit and receive a data signal through an inter-mobile station interface without a radio base station interface, the inter-mobile station interface being set between the first mobile station and the second mobile station, the radio base station interface being set between the radio base station and the first mobile station and the second mobile station, the radio base station comprising:

• a generator that is configured to generate a first parameter and a second parameter to generate an inter-mobile station communication key using a first radio base station key and a second radio base station key, the inter-mobile station communication key being used in security of the data signal transmitted and received through the inter-mobile station interface, the first radio base station key being managed only by the radio base station and the first mobile station, the second radio base station key being managed only by the radio base station and the second mobile station;
• and
• a transmission unit that is configured to transmit the first parameter to the first mobile station and to transmit the second parameter to the second mobile station.

9-10. (canceled)