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Diversity multiplexed transmission determining method and apparatus based on channel quality indication

A technology of channel quality indication and determination method, applied in the field of diversity and multiplexing determination

Active Publication Date: 2009-02-04
LENOVO (BEIJING) CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the instantaneousness of CQI feedback and the variability of channel conditions, the direct relationship between the CQI value and the SNR cannot be determined directly through the CQI table, so how to determine the optimal combination of r and d still has certain problems in practice

Method used

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  • Diversity multiplexed transmission determining method and apparatus based on channel quality indication
  • Diversity multiplexed transmission determining method and apparatus based on channel quality indication
  • Diversity multiplexed transmission determining method and apparatus based on channel quality indication

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Embodiment Construction

[0046] The core idea of ​​the present invention is to count the channel quality indicator CQI values ​​fed back by user terminals in a number of transmission time intervals, calculate its average value and standard deviation, and use the determined average value and standard deviation to form a set and pre-set signal-to-noise Corresponding to the ratio range; when the current CQI value fed back by the user terminal is received, the corresponding signal-to-noise ratio is determined according to the aforementioned correspondence. The signal-to-noise ratio range of the present invention is set according to Shannon's theory and combined with actual communication conditions, and the CQI value set calculated according to the statistical law conforms to the current CQI value distribution law, and the signal-to-noise ratio determined according to the current CQI value is very close For the actual signal-to-noise ratio of the channel, after determining the signal-to-noise ratio, the gain o...

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Abstract

The invention discloses a diversity and multiplexing transmission determining method based on channel quality indication, which relates to diversity and multiplexing transmission determining technique in an LTE system and is provided for solving the complexity of the current diversity and multiplexing, and the adopted technical proposal is that: A: obtaining feedback channel quality indication CQI value of a user terminal in continuous N transmission time intervals before current moment and calculating typical value M and standard deviation S of the obtained CQI value; B: establishing orderly corresponding relations of [M-S, M+S] set and set SNR range; C: determining corresponding SNR of the current CQI value according to the step B, wherein, the CQI value less than M-S is calculated as M-S, and the CQI value more than M+S is calculated as M+S; D: calculating diversity and multiplexing gain according to determined SNR in the step C, thereby, determining diversity or multiplexing to transfer downlink data. The invention also discloses a device realizing the method at the same time. The invention is practical and the realization is simple, the determined diversity and multiplexing gain are accurate.

Description

Technical field [0001] The present invention relates to a technology for determining diversity and multiplexing in a Long Term Evolution (LTE) system, in particular to a method and device for determining diversity and multiplexing transmission based on a channel quality indicator. Background technique [0002] In order to face the future and create continuous competitiveness, the Third Generation Mobile Communications Global Standardization Organization (3GPP) formally established an LTE system research project in December 2004. The starting point for the formulation of LTE is to ensure the competitiveness of 3GPP in the next ten years, so that it can be comprehensively improved in terms of performance, function, and cost. Compared with 3GPP Release 6, its downlink spectrum efficiency will be increased by 3 to 4 times, and the uplink spectrum efficiency will be increased by 2 to 3 times. To this end, the LTE system adopts new technologies such as diversity and multiplexing. Diver...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
CPCH04B7/0613H04B7/0697
Inventor 任俊李翔彭清张孝林
Owner LENOVO (BEIJING) CO LTD
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