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A method and a base station for controlling downlink transmission power, and a method and a user equipment for receiving a pdsch

A technology for transmitting power and user equipment, applied in power management, transmission path sub-channel allocation, multiplexing communication, etc., to achieve the effect of improving system throughput

Inactive Publication Date: 2012-10-17
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The BS is required to efficiently allocate the transmission power per subcarrier in OFDM symbols, because the total transmission power available to the BS at one time is usually limited to a certain value

Method used

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  • A method and a base station for controlling downlink transmission power, and a method and a user equipment for receiving a pdsch
  • A method and a base station for controlling downlink transmission power, and a method and a user equipment for receiving a pdsch
  • A method and a base station for controlling downlink transmission power, and a method and a user equipment for receiving a pdsch

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0195] 1. First embodiment: Quantization level indication

[0196] A plurality of quantization offset levels may be tabulated, and an index corresponding to the offset level may be notified to the UE. The index can be carried by PDCCH. For example, an offset between RS power and data power for a specific layer may be quantized as {3, 1, 0, -1} (dB) or {-3, -1, 0, 1} (dB). For example, quantized offset levels {3, 1, 0, -1} (dB) or {-3, -1, 0, 1} (dB) may be notified to the UE in 2 bits. Different power allocation across layers is allowed if the offset is notified to the UE.

[0197] According to this embodiment, although full power transmission cannot be achieved due to quantization, the UE can reduce transmission power loss based on the offset level indication.

[0198] The memories 200a and 200b in the UE and the BS store quantized offset levels. The processor 400b of the BS may boost the RS power for a specific layer by one of quantized offset levels compared to the data...

no. 2 example

[0199] 2. Second embodiment: rank dependent indication (Rank dependent indication)

[0200] It can be defined that RS power boosting is always used if the offset level is higher than '0'. In other words, if the ratio of data power to data power is not 1, RS power boosting is considered to be used. In this case, the offset level may be fixed according to the transmission rank or the number of CDM groups. According to this embodiment, the offset level is predefined according to the rank or the number of CDM groups. For example, referring to Mathematical Formula 10, for a rank less than or equal to 2, the offset level may be limited to 0, and for a rank greater than 2, the offset level may be limited to -3dB. For another example, for one CDM group, the offset level may be defined as 0, and for two CDM groups, the offset level may be defined as -3dB. For another example, for four CDM groups, the offset level may be defined as -6dB.

[0201] In many cases, the BS determines the...

no. 3 example

[0240] In order to allow full power transmission, the power in RS REs can be shared with data REs since a larger number of layers are multiplexed in data REs. In this case, since some OFDM symbols do not contain UE-specific RSs, so that there is no power theft from UE-specific RS REs, the data power may be different according to OFDM symbols. Thereafter, δ i Indicates the power level of layer i in data REs of OFDMA symbols that do not contain UE-specific RSs.

[0241] Figure 22 An example of power allocation for UE-specific RS REs and data REs according to an RS power stealing embodiment of the present invention is shown.

[0242] refer to Figure 22 , the power of each layer in data REs may vary according to OFDM symbols. However, α i = β i (i = 0, 1, 2, 3) can be satisfied by stealing power of RS REs, so that in OFDM symbols containing RS REs, full power transmission is possible. In this case, in OFDM symbols including UE-specific RSs, the same power is allocated per...

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Abstract

A ratio of data transmission power of a layer per RE to RS transmission power of the layer per RE is predefined according to rank. A BS determines downlink transmission power for a PDSCH according to the predefined rank and a UE assumes that the PDSCH and UE-specific RS(s) for the PDSCH is transmitted with power satisfying the ratio.

Description

technical field [0001] The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for controlling downlink transmission power to resource elements, and a method and apparatus for receiving signals transmitted with downlink transmission power . Background technique [0002] Future-generation multimedia wireless communication systems, which are currently active research areas, require the processing of various types of information including video data and wireless data at high data rates in addition to traditional voice-oriented services. [0003] Orthogonal Frequency Division Multiplexing (OFDM) has recently received great attention due to the advantages of high-speed data rates. OFDM is a special case of Multi-Carrier Modulation (MCM), where a frequency band is divided into a number of orthogonal sub-carriers and data is transmitted on the sub-carriers. The low complexity of OFDM reduces inter-symbol interference. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04W52/28
CPCH04W52/16H04W52/143H04W52/42H04L5/0048H04W72/0473
Inventor 李文一郑载薰高贤秀任彬哲
Owner LG ELECTRONICS INC
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