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Precoding matrix indicator (PMI) information transmission method and apparatus thereof

A technology of precoding matrix and indicating information, which is applied in the field of communication, and can solve problems such as inability to obtain corresponding relationship, inability to perform PMI feedback, and inability to obtain

Active Publication Date: 2012-03-07
DATANG MOBILE COMM EQUIP CO LTD
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  • Claims
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Problems solved by technology

[0018] However, by Figure 9 The corresponding relationship list shown cannot obtain the corresponding relationship between RI and the first PMI coded value and the specific codebook index i1, so that PMI feedback cannot be performed
[0019] In summary, the existing LTE-A standard cannot obtain the specific correspondence between the RI and the first PMI joint coding value and the codebook index i1 when the RI and the first PMI are jointly reported in the PUCCH feedback mode 1-1 sub-mode 1 relationship, making PMI feedback impossible

Method used

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  • Precoding matrix indicator (PMI) information transmission method and apparatus thereof
  • Precoding matrix indicator (PMI) information transmission method and apparatus thereof
  • Precoding matrix indicator (PMI) information transmission method and apparatus thereof

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Embodiment Construction

[0045] Embodiments of the present invention provide a method and device for transmitting PMI information indicated by a precoding matrix, so as to realize feedback and reception of PMI.

[0046] In the embodiment of the present invention, by setting the same correspondence between codebook-compressed PMI values ​​and codebook indexes in advance on the network side and the terminal side, the feedback and reception of the PMI is realized.

[0047] see Figure 10 A method for feeding back PMI information provided in an embodiment of the present invention includes steps:

[0048] S101. The user equipment UE determines that PMI needs to be fed back, and the feedback mode that needs to be used to feed back PMI;

[0049] S102. The UE determines the number of data layers RI and the precoding matrix in the compressed precoding matrix set, and jointly encodes the information value according to the preset RI and the first PMI, together with the RI and the codebook index i 1 Correspondi...

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Abstract

The invention discloses a precoding matrix indicator (PMI) information transmission method and an apparatus thereof used for realizing feedback and reception of a PMI. The invention provides a PMI information feedback method which comprises the following steps: user equipment (UE) determines a PMI needing feedback and a feedback mode which needs to be employed by a feedback PMI; in a compressed precoding matrix set, the UE determines a data layer number RI and a precoding matrix, and according to a preset RI and a first PMI combined coding information value, and a corresponding relation list of the RI and a codebook index, the UE determines the RI and the first PMI combined coding information value; the UE employs the feedback mode, and sends the determined RI and the first PMI combined coding information value to a base station.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for transmitting PMI information indicated by a precoding matrix. Background technique [0002] In a Multiple-Input Multiple-Output (MIMO) system, if the transmitter can know the channel information in a certain way, it can optimize the transmitted signal according to the channel characteristics, thereby improving the receiving quality and reducing the complexity of the receiver. degree requirements. In practical systems, channel information is generally fed back in the form of quantized channel information to reduce feedback overhead and improve system transmission efficiency. [0003] In an LTE (Long Time Evolved, long-term evolution) system, an implicit CSI (Channel State Information, channel state information) feedback method based on a codebook is adopted. UE (User Equipment, user equipment, that is, terminal equipment) measures the downl...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
CPCH04B7/0639H04B7/0478H04B7/0626H04B7/063H04L5/0023H04L5/0053H04L5/0091H04L25/03929H04L25/03949
Inventor 张然然苏昕拉盖施荆梅芳
Owner DATANG MOBILE COMM EQUIP CO LTD
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