A mobile communication method for performing transmission/reception of a data signal between a first mobile station (UE#1) and a second mobile station (UE#2) through an interface (Ud) between mobile stations set between the first mobile station and the second mobile station without transmission/reception through a radio base station interface (Uu) set between the mobile stations and a radio base station (eNB), comprising the steps of: transmitting (S1003a), by the radio base station, a first setting signal regarding a first reference signal to the first mobile station through the radio base station interface; transmitting (S1003b), by the radio base station, a second setting signal regarding a second reference signal to the second mobile station through the radio base station interface; transmitting (S1004a), by the first mobile station, the first reference signal to the second mobile station through the interface between mobile stations based on the first setting signal; and transmitting (S1004b), by the second mobile station, the second reference signal to the first mobile station through the interface between mobile stations based on the second setting signal, the method further comprising the steps of: transmitting, by the radio base station, the second setting signal to the first mobile station through the radio base station interface; transmitting, by the radio base station, the first setting signal to the second mobile station through the radio base station interface; receiving, by the first mobile station, the second reference signal from the second mobile station through the interface between mobile stations based on the second setting signal; and receiving, by the second mobile station, the first reference signal from the first mobile station through the interface between mobile stations based on the first setting signal. transmitting (S1003a), by the radio base station, a first setting signal regarding a first reference signal to the first mobile station through the radio base station interface; transmitting (S1003b), by the radio base station, a second setting signal regarding a second reference signal to the second mobile station through the radio base station interface; transmitting (S1004a), by the first mobile station, the first reference signal to the second mobile station through the interface between mobile stations based on the first setting signal; and transmitting (S1004b), by the second mobile station, the second reference signal to the first mobile station through the interface between mobile stations based on the second setting signal, the method further comprising the steps of: transmitting, by the radio base station, the second setting signal to the first mobile station through the radio base station interface; transmitting, by the radio base station, the first setting signal to the second mobile station through the radio base station interface; receiving, by the first mobile station, the second reference signal from the second mobile station through the interface between mobile stations based on the second setting signal; and receiving, by the second mobile station, the first reference signal from the first mobile station through the interface between mobile stations based on the first setting signal. transmitting, by the radio base station, the second setting signal to the first mobile station through the radio base station interface; transmitting, by the radio base station, the first setting signal to the second mobile station through the radio base station interface; receiving, by the first mobile station, the second reference signal from the second mobile station through the interface between mobile stations based on the second setting signal; and receiving, by the second mobile station, the first reference signal from the first mobile station through the interface between mobile stations based on the first setting signal.