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Downlink power control method and device

A power control and power technology, applied in the field of communication, can solve the problems of 64QAM improvement effect is not obvious, to achieve the effect of improving bit error performance, reducing overhead, and increasing information throughput

Active Publication Date: 2010-11-17
DATANG MOBILE COMM EQUIP CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

In the current LTE standard, CRS already supports pilot power enhancement. From the results of the enhancement, the pilot power enhancement is obvious under QPSK modulation, but the improvement effect of 64QAM is not obvious.

Method used

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  • Downlink power control method and device

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Embodiment Construction

[0041] In the embodiment of the present invention, the base station side sends the EPRE information containing the common pilot, and the ratio information of the actual EPRE of the data in the OFDM symbol containing only the common pilot to the actual EPRE of the data in the OFDM symbol not containing the reference signal The cell-specific parameters, and the user-specific EPRE related information of the initial EPRE including the data in the OFDM symbol without the reference signal, the cell-specific parameters, the user-specific EPRE related information, and the correction information of the different user powers are used It is provided to the terminal side to perform detection and recovery on the received data sent by the base station side.

[0042] The base station allocates the symbol power values ​​on the resource blocks to be sent according to the cell-specific parameters, the user-specific EPRE related information, and the correction information of different user powers...

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Abstract

The invention discloses a downlink power control method and a downlink power control device. The method comprises the following steps that: a base station side sends EPRE information which contains common pilot frequency, the cell dedicated parameter of ratio information of real EPRE of data in an OFDM signal which only contains the common pilot frequency to real EPRE of data in an OFDM signal which does not contain a reference signal, and user dedicated EPRE related information of initial EPRE of data in the OFDM signal which does not contain the reference signal; the base station side distributes each symbol power value on a resource block to be sent according to the cell dedicated parameter, the user dedicated EPRE related information and correction information of different user power and sends the resource block; and a terminal side receives a reference symbol, performs channel estimation, and detects and recovers the received reference symbol according to the ratio of data symbol EPRE and demodulated pilot frequency EPRE which are obtained by parametric computation. The method is favorable for improving the error code performance of a system so as to increase the information throughput of the user while realizing downlink power control.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a downlink power control method and device. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology, as an important physical layer multi-antenna technology to improve transmission quality and efficiency, plays an important role in the new generation of communication systems. For example, the Long Term Evolution (LTE) system supports multiple MIMO technologies such as transmit diversity, spatial multiplexing technology, and beam forming (BF, Beam forming). At present, in the LTE system, downlink precoding (percoding) can process multiple codewords (codewords, multiple codewords may come from the same data source of the same user or different data sources of the same user), in order to improve System throughput and different business forms under better transmission conditions; for beamforming, only single data stream (one data stream correspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04B7/005
Inventor 徐婧潘学明肖国军孙韶辉
Owner DATANG MOBILE COMM EQUIP CO LTD
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