Supercharge Your Innovation With Domain-Expert AI Agents!

Method and device for reporting information of precoding matrix indicator (PMI)

A precoding matrix and indexing technology, which is applied in space transmit diversity, diversity/multi-antenna systems, and error prevention/detection through diversity reception, can solve the problems of high terminal battery consumption and increased delay in determining the complexity of PMI reporting, etc.

Active Publication Date: 2014-03-12
DATANG MOBILE COMM EQUIP CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the candidate set contains 16 precoding matrices, it is necessary to calculate the SINR values ​​of 1600 subcarriers. If the terminal needs to report PMI information frequently, it will cause excessive battery consumption of the terminal. delay will also increase

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
  • Method and device for reporting information of precoding matrix indicator (PMI)
  • Method and device for reporting information of precoding matrix indicator (PMI)
  • Method and device for reporting information of precoding matrix indicator (PMI)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Scenario assumption: the system bandwidth is 10M, the number of antenna ports is 2, and the RI value recently fed back is also 2. At this time, it is necessary to report the wideband channel quality indicator (CQI) information, that is to say, set the frequency domain range as the downlink system bandwidth, such as Figure 4 As shown in A:

[0129] Step 401: Calculate the channel coefficient H of each subcarrier carrying the RS within the set frequency domain;

[0130] Step 402: Determine the precoding matrix candidate set W according to the number of antenna ports and the latest reported RI information. According to the assumed scenario, the number of antenna ports is 2, and the RI value fed back recently is also 2. Then select the precoding matrix in the v=2 column in the following table to form the precoding matrix candidate set, and the number of available precoding matrices at this time is 2, denoted as N pmi . The two precoding matrices are represented by W0 a...

Embodiment 2

[0144] Scenario assumption: the system bandwidth is 10M, the number of antenna ports is 2, and the RI value recently fed back is also 1. At this time, the subband CQI needs to be reported and the subband size is 3, see Figure 4 A:

[0145] Step 401: Calculate the channel coefficient H of each subcarrier carrying the RS within the set frequency domain;

[0146]Step 402: Determine the precoding matrix candidate set W according to the number of antenna ports and the latest reported RI information. According to the assumed scenario, the number of antenna ports is 2, and the RI value fed back recently is also 1. Then select the precoding matrix in the v=1 column in the following table to form the precoding matrix candidate set. At this time, there are 4 available precoding matrices, which are recorded as N pmi . The four precoding matrices are represented by W0, W1, W2 and W3 respectively;

[0147] Step 403: N in the above hypothetical scenario prb pmi , when prb_index>N pr...

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 embodiment of the invention discloses a method and device for reporting information of a precoding matrix indicator (PMI), belonging to the field of wireless communication and being used for reducing PMI reporting time delay of a terminal. In the invention, the terminal receives reference symbols (RSs) sent by a base station on a plurality of resource elements (REs) within a set frequency domain; current available precoding matrixes are determined according to the number of antenna ports of the base station and the number of transmission channels capable of being decomposed independently by the terminal; with respect to each determined current available precoding matrix, the terminal selects part of REs from the plurality of REs, and determines the signal to interface plus noise ratio (SINR) of each RE in the part of REs according to the determined current available precoding matrixes; and according to the determined SINRs of the REs, the terminal determines the precoding matrixes used by the base station for transmitting downlink data within the set frequency domain and reports the information of the PMI to the base station. According to the invention, the PMI reporting time delay of the terminal can be effectively reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for reporting precoding matrix index information. Background technique [0002] In the Long Term Evolution (LTE) system, for downlink transmission modes 4, 5 and 6, the terminal needs to report the precoding matrix index (Precoding Matrix Indicator, PMI) information to the network side, so that the network side uses the precoding matrix corresponding to the PMI to The downlink data is processed and sent to the terminal. [0003] Candidate sets of currently used precoding matrices have been identified in the 36.211 standard. [0004] In the case of two antenna ports {0, 1}, if the number of transmission channels that can be independently decomposed, that is, the rank number RI=1, the set of optional codebooks n∈{0, 1, 2, 3} for the precoding matrix, where n represents the index of the precoding matrix used (ie the codebook index), and the precodi...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/04
Inventor 徐昊王利利汪玲
Owner DATANG MOBILE COMM EQUIP CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com