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Method and device for sending codebook restriction signaling and quantizing feedback of channel information
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A technology of channel information feedback and restricted signaling, which is applied in the field of sending codebook restricted signaling, and can solve problems such as high overhead
Active Publication Date: 2020-06-09
ZTE CORP
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[0022] The present invention provides a method and device for sending codebook restriction signaling and quantitative feedback of channel information, so as to at least solve the problem of high overhead caused by adopting the codebook restriction method in the related art
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Embodiment 1
[0098] The base station and the terminal jointly save the codebooks corresponding to RI / layer=1, 2...r (corresponding to the codebooks corresponding to different RIs mentioned above) according to the agreed method, or the base station configures information according to the codebook parameters of the base station and Generate a codebook corresponding to RI / layer=1,2...r in a manner agreed with the terminal;
specific Embodiment approach 1-1
[0100] The base station and the terminal agree on a fixed main codebook Cb(r), for example, agree on the following 8Tx codebook (dual PMI codebook, each codeword has 2 indexes), here only the case of RI / layerυ=1,2 is listed. Description; defines the following variables (scalar / vector):
[0101] φ n =e jπn / 2 ,v m =[1 e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T
[0102] Define the Rank1 codeword, Rank1 codeword model and codebook based on the above variables: As shown in Table 4,
[0103] Table 4
[0104]
[0105]
[0106] Define the Rank2 codeword, codeword model and codebook based on the above variables: As shown in Table 5,
[0107] table 5
[0108]
[0109] The codebooks corresponding to other RI / layer values are similar to this;
specific Embodiment approach 1-2
[0111] The base station configures the codebook to generate parameters, and the base station and the terminal parameterize the codebook according to the agreed method;
[0112] Here we take the codebook with RI / Layer=1, 2 as an example, and the codebooks with other RI / layer values are similar; since the occurrence ratio of low Rank is much higher than that of high Rank, in the case of high Rank / layer The number of code words is generally less;
[0113] The codebook generation method of RI / Layer=1 is shown in Table 6:
[0114] Table 6
[0115]
[0116] It can be seen that, for Table 6, each codeword is jointly determined by the values of three indexes, which are i1,1, i1,2, i2 respectively, where, N1, N2, O1, O2 and other parameters are configured by the base station. The base station can also configure a subcodebook. The candidate config is shown in Table 7; s1 and s2 represent two horizontally or vertically adjacent Patten in two dimensions Pitch;
[0117] Table 7...
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Abstract
Provided in the present invention are a method and device for use in the transmission of codebook restriction signals and quantized feedback of channel information, the method for transmission of codebook restriction signals comprising: determining a codebook corresponding to different rank indicators (RIs) when channel information is fed back; dividing the codebook corresponding to different RIs into a predetermined number of groups according to the RIs, wherein the predetermined number is greater than or equal to 2; determining a codebook restriction mode corresponding to the codebook in the predetermined number of groups, wherein a first number of groups in the predetermined number of groups adopt a first codebook restriction mode, a second number of groups in the predetermined number of groups adopt a second codebook restriction mode, the first codebook restriction mode being different from the second codebook restriction mode; and transmitting codebook restriction signals according to the determined codebook restriction modes. The present invention solves the problem wherein in related technologies, the use of codebook restriction modes would result in sizable expenses, and reduces the resource expenses spent in restricting codebook.
Description
technical field [0001] The present invention relates to the field of communications, in particular to a method and device for sending codebook restriction signaling and quantitative feedback of channel information. Background technique [0002] In a wireless communication system, the transmitting end and the receiving end usually use multiple antennas in a spatial multiplexing manner to obtain a higher rate. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back the channel information to the sending end, and the sending end uses the transmit precoding technology according to the obtained channel information, which can greatly improve the transmission performance. For Single User-Multi-input Multi-output (SU-MIMO for short), the channel feature vector information is directly used for precoding; for Multi-User Multi-input Multi-output (Multi-User Multi-input Multi-output) -output, referred to as MU-MIMO), more accur...
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