Radio base station and method of adjusting radio parameter

1. A radio base station that forms a cell corresponding to a radio parameter value, the radio base station comprising:

an adjusting unit that adjusts a radio parameter value of the radio base station;

a notifying unit that notifies another radio base station of the adjustment of the radio parameter value; and

a receiving unit that receives information from the other radio base station, the information relating to an influence on a radio characteristic of a cell formed by the other radio base station, the radio characteristic being influenced by the adjustment of the radio parameter of the radio base station, wherein

the adjusting unit readjusts the radio parameter value of the radio base station based on the information, the information relating to the influence on the radio characteristic of the cell formed by the other radio base station, the radio characteristic being influenced by the adjustment of the radio parameter value of the radio base station.

2. The radio base station according to claim 1 , wherein

the adjusting unit readjusts the radio parameter value of the radio base station, based on information relating to an influence on a radio characteristic of a cell formed by the radio base station, the radio characteristic being influenced by the adjustment of the radio parameter value of the radio base station, and information relating to an influence on a radio characteristic of a cell formed by the other radio base station, the radio characteristic being influenced by the adjustment of the radio parameter value of the radio base station.

3. The radio base station according to claim 1 , wherein

the adjusting unit adjusts the radio parameter value of the radio base station in a predetermined cycle.

4. The radio base station according to claim 3 , wherein

the adjusting unit adjusts the radio parameter value of the radio base station in a cycle, the cycle being shorter than the predetermined cycle when a failure of the other radio base station is detected.

5. The radio base station according to claim 1 , wherein

the adjusting unit readjusts the radio parameter value of the radio base station based on information, the information relating to an influence on a radio characteristic of a radio terminal by the adjustment of the radio parameter value of the radio base station, the radio terminal being in the boundary between a cell formed by the radio base station and a cell formed by the other radio base station.

6. The radio base station according to claim 1 , wherein

the adjusting unit readjusts the radio parameter value of the radio base station in the adjustment of the radio parameter value of the radio base station, based on a throughput of a cell formed by the radio base station, and a throughput of a cell formed by the other radio base station.

7. The radio base station according to claim 1 , wherein

the adjusting unit readjusts the radio parameter value of the radio base station in the adjustment of the radio parameter value of the radio base station, based on a reception quality of all radio terminals, all the radio terminals being covered by a cell formed by the radio base station, and a reception quality of all radio terminals, all the radio terminals being covered by a cell formed by the other radio base station.

8. The radio base station according to claim 1 , wherein

the adjusting unit arbitrarily adjusts the radio parameter value of the radio base station.

9. The radio base station according to claim 1 , wherein

the adjusting unit adjusts the radio parameter value of the radio base station based on a previous adjustment result.

10. The radio base station according to claim 1 , wherein

the adjusting unit determines an adjustment cycle and an adjustment amount of the radio parameter value of the radio base station, based on information relating to an influence on a radio characteristic of a cell formed by the radio base station, and information relating to an influence on a radio characteristic of a cell formed by the other radio base station.

11. A method of adjusting a radio parameter used in a radio communication system where a plurality of radio base stations form respective cells corresponding to a radio parameter value of the radio base station, the method comprising:

adjusting a radio parameter value of a first radio base station by the first radio base station, the first radio base station forming a first cell, and notifying a second radio base station of the adjustment of the radio parameter value of the first radio base station, the second radio base station forming a second cell;

transmitting information from the second radio base station to the first radio base station in response to the notification from the first radio base station, the information relating to an influence on a radio characteristic of the second cell by the adjustment of the radio parameter value of the first radio base station; and

receiving the information from the second radio base station at the first radio base station, and readjusting the radio parameter value of the first radio base station by the first radio base station based on the information, the information relating to the influence on the radio characteristic of the second cell by the adjustment of the radio parameter value of the first radio base station.