Mobile communication method, radio base station, and mobile station

A RADIO BASE STATION comprising:

• a receiving unit configured to receive a buffer status report from a MOBILE STATION, wherein
• the receiving unit configured to determine based on predetermined information included in the received buffer status report which the buffer status report is, a first buffer status report indicating an amount of data retained in a transmission buffer corresponding to a logical channel in a RADIO BASE STATION interface set between the MOBILE STATION and the RADIO BASE STATION, or a second buffer status report indicating an amount of data retained in a transmission buffer corresponding to a logical channel in the inter-MOBILE STATION interface set between the MOBILE STATION and another MOBILE STATION.

A MOBILE STATION comprising:

• a transmitting unit configured to transmit a data signal to a RADIO BASE STATION through a RADIO BASE STATION interface set between the MOBILE STATION and the RADIO BASE STATION and transmit a data signal to another MOBILE STATION through an inter-MOBILE STATION interface set between the MOBILE STATION and the other MOBILE STATION, wherein
• the transmitting unit configured to transmit, to the RADIO BASE STATION, a first buffer status report indicating an amount of data retained in a transmission buffer corresponding to a logical channel in a RADIO BASE STATION interface, and a second buffer status report indicating an amount of data retained in a transmission buffer corresponding to a logical channel in the inter-MOBILE STATION interface.