Wireless communication system, wireless communication method, base station, control method of base station, and control program of base station
First Claim
1. A wireless communication system comprising:
- a first base station; and
at least one mobile station that is pre-registered with the first base station to connect to and communicate with the first base station, and measures a reception quality level of a first signal from the first base station and reports a measurement result of the reception quality level to the first base station,wherein the first base station adjusts transmission power of the first base station based on a plurality of reception quality levels of the first signal measured by the at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, whereinif the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, the first base station increases the transmission power, andif the lowest level from among the plurality of reception quality levels is larger than the predetermined target level, the first base station decreases the transmission power.
1 Assignment
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Accused Products
Abstract
To provide appropriate communication quality for a mobile station that is permitted to connect to a femto base station regardless of the place at which the femto base station is installed and the place at which the mobile station is used while reducing the transmission power of the femto base station as much as possible, a femto base station 4 measures the reception quality (e.g., received power or reception SIR) by receiving a common pilot signal from a macro base station 3, and sets the transmission power Ptx of a pilot signal to be transmitted by the femto base station itself based on the received power. Further, the femto base station 4 transmits a common pilot signal with a transmission power Ptx and communicates with a plurality of mobile stations 7-2 to 7-4 within a femtocell 6. Furthermore, the femto base station 4 receives a measurement result of the reception quality level of a common pilot signal transmitted from the femto base station 4 from the mobile stations 7-2 to 7-4, and adjusts the transmission power Ptx of a common pilot signal so that the lowest level among a plurality of reception quality levels gets closer to a predetermined target level.
18 Citations
22 Claims
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1. A wireless communication system comprising:
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a first base station; and at least one mobile station that is pre-registered with the first base station to connect to and communicate with the first base station, and measures a reception quality level of a first signal from the first base station and reports a measurement result of the reception quality level to the first base station, wherein the first base station adjusts transmission power of the first base station based on a plurality of reception quality levels of the first signal measured by the at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, the first base station increases the transmission power, and if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level, the first base station decreases the transmission power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless communication method comprising:
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measuring, by at least one mobile station, a reception quality level of a first signal from a first base station and reporting a measurement result of the reception quality level to the first base station; and adjusting, by the first base station, transmission power of the first base station based on a plurality of reception quality levels of the first signal measured by the at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein the at least one mobile station is pre-registered with the first base station to connect to and communicate with the first base station, said adjusting includes increasing the transmission power if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, and said adjusting includes decreasing the transmission power if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level. - View Dependent Claims (17)
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18. A base station used in a wireless communication system comprising:
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a wireless communication unit being configured to transmit a first signal, and communicate with at least one mobile station; and a setting unit being configured to adjust transmission power based on a plurality of reception quality levels of the first signal measured by said at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein the at least one mobile station is pre-registered with the base station to connect to and communicate with the base station, if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, the setting unit increases the transmission power, and if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level, the setting unit decreases the transmission power. - View Dependent Claims (19)
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20. A method of controlling a base station used in a wireless communication system comprising:
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transmitting a first signal, and communicating with at least one mobile station; and adjusting transmission power based on a plurality of reception quality levels of the first signal measured by said at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein the at least one mobile station is pre-registered with the base station to connect to and communicate with the base station, said adjusting includes increasing the transmission power if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, and said adjusting includes decreasing the transmission power if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level.
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21. A non-transitory computer readable media storing a base station control program that causes a computer to execute control processing for a base station comprising wireless transmitting means, the control processing comprising:
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a process of causing the wireless transmitting means to transmit a first signal; and a process of adjusting transmission power in the wireless transmitting means based on a plurality of reception quality levels of the first signal measured by at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein the at least one mobile station is pre-registered with the base station to connect to and communicate with the base station, said adjusting includes increasing the transmission power if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, and said adjusting includes decreasing the transmission power if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level.
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22. A base station used in a wireless communication system comprising:
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means for transmitting a first signal, and communicating with at least one mobile station; and means for adjusting transmission power based on a plurality of reception quality levels of the first signal measured by said at least one mobile station so that a lowest level from among the plurality of reception quality levels gets closer to a predetermined target level, wherein the at least one mobile station is pre-registered with the base station to connect to and communicate with the base station, if the lowest level from among the plurality of reception quality levels is smaller than the predetermined target level, said means for adjusting increases the transmission power, and if the lowest level from among the plurality of reception quality levels is larger than the predetermined target level, said means for adjusting decreases the transmission power.
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Specification