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A power control method and device
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A technology for power control and transmit power, applied in the field of power control methods and devices, can solve problems such as the reduction of system spectral efficiency, and achieve the effects of improving coverage and improving throughput
Active Publication Date: 2011-03-16
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology
[0007] However, when using the above-mentioned soft frequency reuse technology, the terminals at the cell edge can only use frequencies within a part of the bandwidth. When the terminals are all concentrated at the cell edge, the spectral efficiency of the system will be greatly reduced
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Embodiment 1
[0074] Assuming a certain terminal A, according to the strength of the pilot power, it is determined that the terminal A is in the center of the cell. The SNR measured by terminal A is 24dB.
[0075] 1. According to Table 1, it can be judged from the row where the serial number 14 is located: the CQI of terminal A is 64QAM, 4 / 5 coding rate;
[0076] 2. Compare the terminal ACQI64QAM with the set center terminal CQI threshold 64QAM, and determine that the CQI64QAM and 4 / 5 coding rate of terminal A are greater than the central terminal CQI threshold 64QAM and 2 / 3 coding rate;
[0077] 3. Assuming that the SNR margin is 0.5dB, the SNR threshold at this time is 16.8+0.5=17.3dB;
[0078] 4. According to the comparison between the currently measured SNR of 24dB and the SNR threshold of 17.3dB, the SNR of terminal A is greater than the SNR threshold. Therefore, the transmit power of terminal A should be lowered.
Embodiment 2
[0080] Assuming a terminal B, according to the strength of the pilot power, it is determined that the terminal B is in the center of the cell, and the measured SNR is 12dB.
[0081] 1. According to Table 1, it can be judged from the row where the serial number 11 is located: the CQI of terminal B is 16QAM, 4 / 5 coding rate;
[0082] 2. Compare the CQI16QAM of terminal B with the set central terminal CQI threshold 64QAM, and determine that the CQI of terminal B is smaller than the central terminal CQI threshold;
[0083] 3. Keep the current power unchanged.
Embodiment 3
[0085] Assuming a terminal C, it is determined that the terminal C is at the edge of the cell according to the strength of the pilot power, and the measured SNR is -2dB.
[0086] 1. According to Table 1, it can be judged from the row where the serial number 2 is located: the CQI of terminal C is QPSK, and the encoding rate is 1 / 5;
[0087] 2. Compare the CQIQPSK of terminal C with the set edge terminal CQI threshold QPSK, and determine that the CQIQPSK and 1 / 5 coding rate of terminal C are lower than the edge terminal CQI threshold QPSK and 2 / 3 coding rate; therefore, the transmission of terminal C should be increased power.
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Abstract
The utility model provides a power control method which comprises that: determine the position of a terminal in the cell, measure the signal-to-noise ratio of the terminal, and determine the channel quality indicator; if the terminal is positioned at the central position of the cell, then judge whether the CQI of the terminal is larger than or equal to the set central terminal CQI threshold; if the CQI of the terminal is larger than or equal to the set central terminal CQI threshold, lower the transmit power of a sender; otherwise, maintain the present transmit power; if the terminal is positioned at the edge position of the cell, then judge whether the CQI of the terminal is smaller than the set central terminal CQI threshold; if the CQI of the terminal is smaller than the set central terminal CQI threshold, raise the transmit power of the sender; otherwise, maintain the present transmit power. The power control device of the utility model comprises a measurement unit used to measurethe terminal SNR and determine the CQI, a judgment unit used to judge the position of the terminal in the cell, a comparing unit used to choose a corresponding comparing threshold according to the position of the terminal in the cell, and a power adjustment unit used to adjust power according to the result feedback from the comparing unit. The utility model can greatly improve the throughput of the terminal at the edge position of the cell under the condition that basically the throughput of the terminal at the central position of the cell has no loss; therefore the coverage of the system is improved.
Description
technical field [0001] The present invention relates to the communication field, in particular to a power control method and device. Background technique [0002] A cellular mobile communication system modulated by Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) refers to a cellular mobile communication system in which a terminal uses multiple orthogonal subcarriers for data transmission. In this system, since subcarriers used by different terminals are orthogonal to each other, there is no inter-terminal interference within a cell. However, terminals in different cells will use the same sub-carrier for data transmission, which will cause greater inter-cell interference. Therefore, for cellular mobile communication systems based on OFDM modulation, inter-cell interference becomes the main interference, especially for terminals at the cell edge, which seriously affects network coverage and throughput of cell edge terminals. [0...
Claims
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Application Information
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