Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mapping method for special downlink pilot frequency and physical resource block

A technology of physical resource blocks and dedicated pilots, which is applied to the mapping field of downlink dedicated pilots and physical resource blocks, can solve the problems of beamforming weight feedback overhead and the inability of common pilots to obtain all channel information, so as to avoid feedback overhead. Effect

Active Publication Date: 2013-05-01
ZTE CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, in the current version of the LTE standard, when the base station uses beamforming with more than 4 antennas, the common pilot cannot obtain all channel information, and there is a problem of feedback overhead of beamforming weights. A kind of New mapping method of downlink dedicated pilot and physical resource block

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
  • Mapping method for special downlink pilot frequency and physical resource block
  • Mapping method for special downlink pilot frequency and physical resource block
  • Mapping method for special downlink pilot frequency and physical resource block

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054] Example 1: Downlink dedicated pilots can frequency hop together with common pilots

[0055] here, as image 3 As shown, since A=1, B=12, then M=9, N=6, G=4, that is to say, in the embodiment of the present invention, the downlink dedicated pilots are respectively mapped to the fourth , the 9th, and the 12th (B=12) OFDM symbols.

[0056] Based on the above content, the operation of performing the mapping processing of other downlink dedicated pilots in step S208 is specifically:

[0057] Mapping the second downlink dedicated pilot to the 12th OFDM symbol in the time domain, and mapping to the A+4=5th subcarrier in the frequency domain;

[0058] Mapping the third downlink dedicated pilot to the 12th OFDM symbol in the time domain, and mapping to the A+8=9th subcarrier in the frequency domain;

[0059] Mapping the fourth downlink dedicated pilot to the 9th OFDM symbol in the time domain, and mapping to the A+2=3 subcarrier in the frequency domain;

[0060] Mapping the ...

example 2

[0069] Example 2: Downlink dedicated pilots can frequency hop together with common pilots

[0070] Such as Figure 4(A) with 4(B) As shown, the size of the minimum physical resource block in the frame structure of the long cyclic prefix is ​​12 OFDM symbols in the time domain and 12 subcarriers in the frequency domain. The two common pilots are distributed in the first row of the minimum physical resource block, and the 4 rows, 7 and 10 rows.

[0071] (1) Control information occupies the first two OFDM symbols

[0072] Referring to FIG. 4(A), A=1, B=12, then M=9, N=6, G=3.

[0073] At this time, in step S208, the mapping methods and references of the first nine downlink dedicated pilots image 3 The mapping methods described are the same, and the mapping methods of the tenth to twelfth downlink dedicated pilots are as follows:

[0074] Mapping the tenth downlink dedicated pilot to the third OFDM symbol in the time domain, and mapping to the A+2=3th subcarrier in the frequ...

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 mapping method for special downlink pilot frequency and a physical resource block. The method comprises the following processings: processing of frequency domain interval arrangement in which the frequency domain interval of the special downlink pilot frequency mapped to the same time domain is arranged as 3 subcarriers, processing of time domain interval arrangement in which the time domain interval of the special downlink pilot frequency mapped to different time domains is arranged as 2 OFDM marks, processing of initial mapping in which a first special downlink pilot frequency is mapped to corresponding positions, with initial positions being expressed by A and B, wherein A is the initial position of the frequency domain and B is the initial position of the time domain, and mapping processing of other special downlink pilot frequencies is performed according to the initial position, the frequency domain interval, the time domain interval and preset rules of the first special downlink pilot frequency. By the invention, the problem in the existing LTE standard version that public pilot frequency can not acquire all channel information is solved and expenditure for the feedback of beam formation weight is avoided.

Description

technical field [0001] The invention relates to a method for mapping downlink dedicated pilots and physical resource blocks in a long cyclic prefix frame structure in a long term evolution system (Long term evolution, LTE for short) in the field of mobile communications. Background technique [0002] In the current version of the LTE (Long term evolution, long-term evolution system) standard 3GPP (3rd Generation partnership project, third generation mobile communication partnership project) TR 36.211, the beamforming technology supporting single stream is specified, in order to distinguish beamforming and Precoding also clarifies the condition that beamforming is applied to the number of antennas greater than or equal to four. However, only four common pilots are defined in the current version of the LTE standard, so only four common pilots are used in practice, and the channel information of each antenna port is extracted from the corresponding common pilot. Therefore, whe...

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): H04L25/02H04L27/26H04L1/06
Inventor 姜静孙云锋于辉
Owner ZTE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com