DOWNLINK POWER CONTROL METHOD AND APPARATUS OF OFDM SYSTEM
First Claim
1. A downlink power control method of a base station, the method comprising:
- transmitting a downlink data channel at a normal subframe according to first downlink power information for the normal subframe; and
transmitting the downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for the ABS,wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other.
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Abstract
A downlink power control method and apparatus for improving downlink power efficiency gain in an Orthogonal Frequency Division Multiplexing (OFDM) system is provided. The downlink power control method includes transmitting a downlink data channel at a normal subframe according to first downlink power information for the normal subframe, and transmitting the downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for the ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. The downlink power control method and apparatus is capable of regulating inter-cell interference variation between contiguous symbols at a predetermined level in a subframe at a terminal of a neighbor cell and making it possible to schedule the UE receiving the low power data channel using the power ratio of the feedbacks from the UE.
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Citations
14 Claims
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1. A downlink power control method of a base station, the method comprising:
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transmitting a downlink data channel at a normal subframe according to first downlink power information for the normal subframe; and transmitting the downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for the ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. - View Dependent Claims (2, 3, 4)
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5. A base station for controlling downlink power, the base station comprising:
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a transmitter for transmitting a downlink data channel at a normal subframe according to first downlink power information for the normal subframe and for transmitting a downlink data channel at an almost Blank Subframe (ABS) according to second downlink power information for the ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. - View Dependent Claims (7, 8)
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6. The base station of claim 6, wherein the transmitter allocates different transmit powers for symbols carrying Common Reference Signal (CRS) and symbols carrying no CRS in the normal subframe according to a predetermined ratio and a same transmit power for symbols carrying CRS and symbols carrying no CRS in the ABS.
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9. A downlink reception method of a terminal, the method comprising:
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receiving a downlink data channel at a normal subframe according to first downlink power information for the normal subframe; and receiving the downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for the ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. - View Dependent Claims (10, 11)
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12. A terminal for receiving downlink data channel, the terminal comprising:
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a receiver for receiving a downlink data channel at a normal subframe according to first downlink power information for a normal subframe and for receiving a downlink data channel at an Almost Blank Subframe (ABS) according to second downlink power information for ABS, wherein the first downlink power information for the normal subframe and the second downlink power information for the ABS differ from each other. - View Dependent Claims (13, 14)
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Specification