A wireless communication system for autonomously performing radio resource management comprising: a first base station configured to transmit a first downlink signal by using a first radio resource (RF 1), communicate with a first mobile station within a first cell, and transmit cell attribute information including cell priority information indicating Hierarchical Cell Structure, HCS, priority levels of the first cell and a third cell, the HCS priority levels being defined such that a HCS priority level increases with a decrease in the size of a cell; a second base station configured to receive the cell attribute information, perform radio resource management based on the cell attribute information, and communicate with a second mobile station within a second cell, the radio resource management including selecting at least one radio resource from a plurality of predetermined assignment candidates (RF1, RF2, RF3) and using the selected radio resource; and a third base station configured to transmit a second downlink signal by using a second radio resource and communicate with a third mobile station within the third cell, wherein each of the first, second, and third mobile stations (9-1, 9-2, 9-3) is configured to measure reception quality of the first and second downlink signals, when reception quality of the first downlink signal is equal to or larger than a first predetermined value and reception quality of the second downlink signal is equal to or larger than a second predetermined value, each of the first, second, and third mobile stations (9-1, 9-2, 9-3) is configured to select a cell having a higher HCS priority level between the first and third cells (6, 7) and communicates with a base station corresponding to the selected cell, the second base station is configured to measure reception quality of the first and second downlink signals, and when reception quality of the first downlink signal is equal to or larger than a third predetermined value and reception quality of the second downlink signal is equal to or larger than a fourth predetermined value, the second base station is configured to select a radio resource used in a cell having a lower HCS priority level between the first and third cells (6, 7) preferentially over a radio resource used in the other cell having a higher HCS priority level in the selection to select at least one radio resource from the plurality of predetermined assignment candidates (RF1, RF2, RF3). a first base station configured to transmit a first downlink signal by using a first radio resource (RF 1), communicate with a first mobile station within a first cell, and transmit cell attribute information including cell priority information indicating Hierarchical Cell Structure, HCS, priority levels of the first cell and a third cell, the HCS priority levels being defined such that a HCS priority level increases with a decrease in the size of a cell; a second base station configured to receive the cell attribute information, perform radio resource management based on the cell attribute information, and communicate with a second mobile station within a second cell, the radio resource management including selecting at least one radio resource from a plurality of predetermined assignment candidates (RF1, RF2, RF3) and using the selected radio resource; and a third base station configured to transmit a second downlink signal by using a second radio resource and communicate with a third mobile station within the third cell, wherein each of the first, second, and third mobile stations (9-1, 9-2, 9-3) is configured to measure reception quality of the first and second downlink signals, when reception quality of the first downlink signal is equal to or larger than a first predetermined value and reception quality of the second downlink signal is equal to or larger than a second predetermined value, each of the first, second, and third mobile stations (9-1, 9-2, 9-3) is configured to select a cell having a higher HCS priority level between the first and third cells (6, 7) and communicates with a base station corresponding to the selected cell, the second base station is configured to measure reception quality of the first and second downlink signals, and when reception quality of the first downlink signal is equal to or larger than a third predetermined value and reception quality of the second downlink signal is equal to or larger than a fourth predetermined value, the second base station is configured to select a radio resource used in a cell having a lower HCS priority level between the first and third cells (6, 7) preferentially over a radio resource used in the other cell having a higher HCS priority level in the selection to select at least one radio resource from the plurality of predetermined assignment candidates (RF1, RF2, RF3).