Cooperative precoding method, cooperative information interaction method and system

A technology for precoding information and interactive methods, applied in the field of cooperative precoding methods, can solve problems such as scheduling constraints, channel information quantization errors, channel estimation errors, etc., and achieve the effects of eliminating interference, high scheduling flexibility, and small SINR.

Active Publication Date: 2011-05-25
ZTE CORP
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can better eliminate interference, which relies on the channel information feedback from UE1 to eNodeB2, and needs to feed back channel information of each frequency domain subband (Subband), which increases the feedback amount of the uplink channel; and, because it is at the edge of the cell, The user's feedback accuracy will also be affected
[0007] Therefore, the problems existing in the existing cooperative beamforming technology based on spatial interference cancellation include: (1) Compared with the case of a single cell, the UE needs to feed back additional channel information, which cannot be transparent in mode, and needs to des

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cooperative precoding method, cooperative information interaction method and system
  • Cooperative precoding method, cooperative information interaction method and system
  • Cooperative precoding method, cooperative information interaction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Assuming that there are cell A and cell B, the two cells may or may not belong to the same base station, and perform coordinated transmission. Both cell A and cell B have Nt transmit antennas. On a time-frequency transmission resource M, M is one RB (ResourceBlock, resource block) or multiple RBs, cell A uses w for its serving user UE1 a For precoding, when Nt=8, that is, when there are 8 transmitting antennas, w a It may be a codeword in the 8-antenna layer 1 codebook in the LTE-A standard.

[0064] The codebook model of LTE-A standard 8-antenna 1-layer is:

[0065] W m , n ( 1 ) = 1 8 v m φ n v ...

Embodiment 2

[0071] There are cell A and cell B, which belong to or do not belong to the same base station, and perform cooperative transmission. Cells A and B both have Nt transmit antennas.

[0072] On a time-frequency transmission resource M, M is one RB (ResourceBlock, resource block) or multiple RBs, cell A uses w for its serving user UE1 a For precoding, when Nt=4, w a It may be a codeword in the 4-antenna layer 1 codebook in the LTE / LTE-A standard as shown in Table 1.

[0073] Table 1: List of 4-antenna codebooks

[0074]

[0075] in, I is the unit matrix, Represents the matrix W k The jth column of the vector. Represents the matrix W k the jth 1 , j 2 ,..., j n A matrix of columns. for example can be

[0076]On the same time-frequency transmission resource M, cell B uses w b for precoding, w b It may be a codeword in the 4-antenna layer 1 codebook in the LTE-A standard.

[0077] for example can be Or the other in the 4-antenna codebook with w a Orthogonal ...

Embodiment 3

[0079] There are cell A and cell B, which belong to the same base station or to different base stations, and perform coordinated transmission. Cells A and B both have Nt transmit antennas.

[0080] On a time-frequency transmission resource M, where M is one RB (ResourceBlock) or multiple RBs, cell A uses w for its serving user UE1 a For precoding, when Nt=8, w a It may be two columns of a codeword in the 8-antenna layer 4 codebook in the LTE-A standard.

[0081] The codeword model in the LTE-A 8-antenna 4-layer time codebook is:

[0082]

[0083] where: φ n = e jπn / 2 , v m =[1e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T ,

[0084] v m′ =[1e j2πm′ / 32 e j4πm′ / 32 e j6πm′ / 32 ] T

[0085] For example, it could be in,

[0086] It is a complex number, which can take the value of 1, -1, j, -j, etc., For DFT vectors:

[0087] v m a = 1 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a cooperative precoding method, a cooperative information interaction method and a system. The system comprises a first base station to which a first cell belongs and a first user terminal served by the first cell, a second base station to which a second cell belongs and a second user terminal served by the second cell; in the same fragment of time frequency resource, the first base station pre-codes a to-be-transmitted symbol of the first user terminal in the first cell by using a first precoding weight and transmits data to the first terminal; the second base station pre-codes a to-be-transmitted symbol of the second user terminal in the second cell by using a second precoding weight and transmits data to the second terminal; and the first precoding weight and the second precoding weight are in an orthogonal relation. Orthogonal cooperative precoding is adopted among the cells, and the purpose of eliminating interference is fulfilled by using the orthogonality of the receiving space.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a cooperative precoding method, a cooperative information interaction method and a system. Background technique [0002] In a wireless communication system, the edge of a cell (CELL) may receive signals from multiple cells other than the serving cell, resulting in strong interference. At this time, the SINR (Signal Interference Noise Ratio, power ratio of signal to interference noise) of the wireless signal received by the receiving terminal at the edge of the cell is relatively low, so the transmission performance of the user at the edge of the cell will be relatively poor. [0003] Such as figure 1 As shown in , a schematic diagram of a scenario where a cell edge user is interfered is given. In a wireless communication system, when each cell / base station uses the same time-frequency domain resource location to transmit data, the signal sent by base statio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04L1/00
CPCH04B7/024H04W72/0466H04W72/082H04L5/0001H04L1/00H04W72/541
Inventor 陈艺戬李儒岳郁光辉郭森宝孙云锋
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap