Feedback method of channel state information and terminal

A technology of channel state information and channel information, which is applied in the direction of transmission modification and transmission system characterized by signaling and based on link quality, and can solve problems such as not meeting the requirements of LTE-A system

Inactive Publication Date: 2010-12-01
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0052] The main purpose of the present invention is to provide a feedback method of channel state information to solve the problem that the original feedback method used in the related art can no longer meet the needs of the LTE-A system

Method used

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  • Feedback method of channel state information and terminal
  • Feedback method of channel state information and terminal
  • Feedback method of channel state information and terminal

Examples

Experimental program
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Embodiment 1( approach 1 Embodiment 1

[0180] Referring to method 1, this embodiment provides a feedback method of channel state information, such as Figure 5 shown, including the following steps:

[0181] S101: The UE measures a downlink pilot to obtain downlink channel information.

[0182] Specifically, the UE obtains the channel response between the transmitting and receiving antennas according to the downlink pilot, and obtains the channel information of each downlink RE through channel estimation. RE is the smallest unit of physical resources, so UE can obtain downlink channel information more accurately. Physical resources are generally divided in the frequency domain and the time domain. For a physical resource, the channel response of a single-transmission and single-reception antenna is a value. Channel response between antenna pairs.

[0183] S102: The UE calculates RI, W1, W2 and CQI according to the channel information or calculates the best RI, W and CQI.

[0184] After obtaining the channel info...

Embodiment 2( approach 1 Embodiment 2

[0217] Referring to method 1, this embodiment provides another method for channel state information:

[0218] Others are similar to Embodiment 1, except that the cut-off point of 1 PMI or 2 PMIs in this embodiment can be selected as RI=4, and when RI is less than or equal to 4, two PMI feedbacks of W1 and W2 can be used; when RI When >4, use 1 PMI feedback, or no PMI feedback. In this embodiment, two PMIs are taken as an example for illustration, but it is not limited to using two PMIs. For example, when the selected W1 is a partially specified codeword in the codebook, one PMI is used instead of two PMIs.

[0219] In this embodiment, the information carried by Report Type A and Report Type B is shown in Table 6;

[0220] Table 6: Information carried by Report Type A and Report Type B

[0221]

[0222] In Table 6, Report Type A is always a 4-bit feedback, with a total of 16 status bits, of which:

[0223] The 4 status bits indicate RI=1 and which codeword region W1 is in...

Embodiment 3( approach 2 Embodiment 1

[0228] refer to image 3 , the feedback method of the channel state information provided in this embodiment includes the following steps:

[0229] S201: The UE measures a downlink pilot to obtain downlink channel information.

[0230] Specifically, the UE obtains the channel response between the transmitting and receiving antennas according to the downlink pilot, and obtains the channel information of each downlink RE through channel estimation. RE is the smallest unit of physical resources, so UE can obtain downlink channel information more accurately. Physical resources are generally divided in the frequency domain and time domain. For a physical resource, the channel response of a single-transmission and single-reception antenna is a numerical value; for a multiple-transmission and multiple-reception antenna, the channel of a time-frequency resource is represented by a channel matrix, which represents the transmit-receive antenna. channel response between pairs.

[0231]...

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Abstract

A feedback method of channel state information comprises the following steps: in the mode supporting closed-loop space multiplexing, user equipment (UE) uses at least two report types to feed back the channel state information, wherein when the rank RI of the channel is not more than M, the UE uses a code word W1 and a code word W2 to jointly represent the subband or wideband channel information, the report type A includes the indication information of the rank RI of the channel and the indication information of partial code word W1 and the report type B includes the indication information of the code word W2 and the indication information of partial code word W1; and when the rank RI of the channel is more than M, the UE uses one code word W to represent the subband or wideband channel information and feeds the indication information of the code word W back to a base station or does not feed back the code word information, or the UE uses a fixed matrix and code word W to jointly represent the subband or wideband channel information. The method satisfies the requirement of the LTE-A system and dispenses with PUCCH expansion.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a channel state information feedback method and a terminal. Background technique [0002] In a wireless communication system, the sending end and the receiving end use multiple antennas to obtain a higher rate by means of spatial multiplexing. 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), channel feature vector information can be directly used for precoding; for Multiple User MIMO (MU-MIMO), More accurate channel information is required. [0003] In the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) Long T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
CPCH04B7/0626H04L1/003H04L1/0026
Inventor 李儒岳陈艺戬徐俊徐前子杨勋
Owner ZTE CORP
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