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False detection preventive method and system for downlink control information in LTE (-A) system

A technology for controlling information and preventing errors, applied in the field of communication, can solve the problem of high false detection rate, achieve the effect of improving accuracy, low complexity, and solving DCI false detection

Active Publication Date: 2016-05-11
LEADCORE TECH
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Problems solved by technology

[0007] The object of the present invention is to provide a method and system for preventing false detection of downlink control information in an LTE (-A) system, so as to solve the problem of high false detection rate in the existing method for preventing false detection of downlink control information

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  • False detection preventive method and system for downlink control information in LTE (-A) system

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Embodiment Construction

[0028] The method and system for preventing false detection of downlink control information in the LTE(-A) system proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0029] Under high signal-to-noise ratio, when the fixed point is implemented, because the soft bits are saturated, there is still a relatively high probability of DCI (downlink control information) misdetection after being filtered by the anti-mis-detection strategy. Therefore, please refer to figure 1 The present invention provides a method for preventing misdetection of downlink control informa...

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Abstract

The invention provides a false detection preventive method for downlink control information in an LTE (-A) system. The method comprises that PDCCH is decoded, CRC verification is carried out after decoding, DCI is determined to be incorrect if CRC verification fails, and whether false detection occurs in the DCI is determined if CRC verification passes; DCI decoding information and DCI format information corresponding to the DCI decoding information in the PDCCH decoding process are cached, the DCI decoding information is determined by utilizing a false alarm determination rule corresponding to the DCI format information, DCI is determined to be incorrect if the false alarm determination rule is not met, and DCI false detection prevention determination is carried out if the false alarm determination rule is met; and the average power of DCI is obtained, the adjacent average power of CRS is obtained, the average power of the CRS is compared with the average power of the DCI, the DCI is determined to be incorrect if the difference therebetween is greater than a preset threshold, and the DCI is determined to be correct if the difference therebetween is lower than the preset threshold.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for preventing false detection of downlink control information in an LTE(-A) system. Background technique [0002] The downlink control information (DCI) adopts the TBCC encoding method. Due to the characteristics of the cyclic redundancy check code (CRC), there must be a certain probability of TBCC false detection. That is, it is possible that the decoding is incorrect, but the CRC check will also pass. This probability is theoretically 1 / 2^L. L represents the length of the CRC. The DCI contains the control information of the downlink channel. If there is a false detection, it will have a serious impact on the reception and transmission. Therefore, other solutions must be used to reduce the probability of false detection. [0003] The existing DCI anti-false detection strategies mainly include: when the CRC passes through the PDCCH (Physical Downlink ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/24H04L1/00
Inventor 霍成海严伟梁丰年
Owner LEADCORE TECH
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