Suppression of interferences between cells
First Claim
Patent Images
1. A mobile communication system using FDMA for an uplink and comprising:
- a radio base station;
a neighboring base station that neighbors the base station; and
user equipment;
wherein the same frequency for the uplink is used between the radio base station and the neighboring base station, and a time-slot and a frequency to be transmitted by each unit of the user equipment are changed for each unit of the user equipment to multiplex a plurality of user signals,wherein the radio base station includes a first circuit that measures an interference power in a cell that belongs to the radio base station, and a second circuit that transmits to the neighboring base station interference information that includes frequency information in which the interference power is measured, wherein the measured interference power at least relates to the neighboring base station;
wherein the neighboring base station includes a third circuit that receives the interference information from the radio base station, and a fourth circuit that checks a correlativity between the frequency and the time-slot of the interference information and that of a signal received from the user equipment and that performs scheduling, for a unit of user equipment in a cell that belongs to the neighboring base station, the scheduling specifying a time-slot and a frequency; and
wherein the user equipment includes a fifth circuit that transmits an uplink user signal in accordance with the time-slot and frequency that are specified by the scheduling.
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Abstract
An interference power measuring circuit in a base station measures the interference power in a cell that the base station belongs to. When the measured interference power is larger than a predetermined value, the transmitter in the base station transmits the interference information for each frequency used in the FDMA communication system to a base station in a neighboring cell. The base station in the neighboring cell instructs user equipment that communicates the base station to reduce a transmission power.
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Citations
12 Claims
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1. A mobile communication system using FDMA for an uplink and comprising:
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a radio base station; a neighboring base station that neighbors the base station; and user equipment; wherein the same frequency for the uplink is used between the radio base station and the neighboring base station, and a time-slot and a frequency to be transmitted by each unit of the user equipment are changed for each unit of the user equipment to multiplex a plurality of user signals, wherein the radio base station includes a first circuit that measures an interference power in a cell that belongs to the radio base station, and a second circuit that transmits to the neighboring base station interference information that includes frequency information in which the interference power is measured, wherein the measured interference power at least relates to the neighboring base station; wherein the neighboring base station includes a third circuit that receives the interference information from the radio base station, and a fourth circuit that checks a correlativity between the frequency and the time-slot of the interference information and that of a signal received from the user equipment and that performs scheduling, for a unit of user equipment in a cell that belongs to the neighboring base station, the scheduling specifying a time-slot and a frequency; and wherein the user equipment includes a fifth circuit that transmits an uplink user signal in accordance with the time-slot and frequency that are specified by the scheduling. - View Dependent Claims (2, 3)
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4. In a mobile communication system using FDMA for an uplink and comprising:
- a radio base station;
a neighboring base station that neighbors the base station; and
user equipment, wherein the same frequency for the uplink is used between the radio base station and the neighboring base station, and a time-slot and a frequency to be transmitted by each of unit of the user equipment are changed for each unit of the user equipment to multiplex a plurality of user signals, the radio base station comprising;a first circuit that measures an interference power in a cell that belongs to the radio base station; and a second circuit that transmits to the neighboring base station interference information that includes frequency information in which the interference power is measured, wherein the measured interference power at least relates to the neighboring base station, wherein the neighboring base station includes a third circuit that receives the interference information from the radio base station, and a fourth circuit that checks a correlativity between the frequency and the time-slot of the interference information and that of a signal received from the user equipment and that performs scheduling, for a unit of user equipment in a cell that belongs to the neighboring base station, the scheduling specifying a time-slot and a frequency. - View Dependent Claims (5, 6)
- a radio base station;
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7. In a mobile communication system using FDMA for an uplink and comprising:
- a radio base station;
a neighboring base station that neighbors the base station; and
user equipment, wherein the same frequency for the uplink is used between the radio base station and the neighboring base station, and a time-slot and a frequency to be transmitted by each unit of the user equipment are changed for each unit of the user equipment to multiplex a plurality of user signals, the user equipment comprising;a first circuit that communicates with the neighboring base station that receives, from the radio base station that measures an interference power in a cell that belongs to the radio base station, the interference information including frequency information in which the interference power is measured, wherein the measured interference power at least relates to the neighboring base station; and a second circuit that transmits an uplink user signal in accordance with the time-slot and frequency that are specified by a scheduling based on the received interference information in the neighboring base station, wherein the neighboring base station includes a third circuit that receives the interference information from the radio base station, and a fourth circuit that checks a correlativity between the frequency and the time-slot of the interference information and that of a signal received from the user equipment and that performs scheduling, for a unit of user equipment in a cell that belongs to the neighboring base station, the scheduling specifying a time-slot and a frequency. - View Dependent Claims (8, 9)
- a radio base station;
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10. A method of suppressing interferences between cells in a mobile communication system using FDMA for an uplink and comprising:
- a radio base station;
a neighboring base station that neighbors the base station; and
user equipment, wherein the same frequency for the uplink is used between the radio base station and the neighboring base station, and a time-slot and a frequency to be transmitted by each unit of the user equipment are changed for each unit of the user equipment to multiplex a plurality of user signals, the method comprising the steps ofmeasuring, by the radio base station, an interference power in a cell that belongs to the radio base station; transmitting, by the radio base station, to the neighboring base station interference information that includes frequency information in which the interference power is measured, wherein the measured interference power at least relates to the neighboring base station; receiving, by the neighboring base station, the interference information from the radio base station, and checking, by the neighboring base station, a correlativity between the frequency and the time-slot of the interference information and that of a signal received from the user equipment. - View Dependent Claims (11, 12)
- a radio base station;
Specification