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

A sending method for reference signals

A reference signal and transmission method technology, applied in wireless communication, electrical components, network planning, etc., can solve problems such as poor cross-correlation, limited positioning performance, and affecting system transmission performance

Inactive Publication Date: 2009-09-16
深圳市恒程汇文化科技有限公司
View PDF2 Cites 61 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The sending position of the CRS signal is fixed, and the sending position in each frame (including each subframe) is the same, and the cross-correlation is poor;
[0007] (2) The interference between adjacent cells is relatively large; for example, when two antennas transmit, the maximum reuse factor is 3;
[0008] (3) The transmission power of the CRS signal is fixed, the transmission power cannot be changed flexibly, and the positioning performance is limited
[0009] Due to the above-mentioned problems in the existing solution, the positioning of the terminal is not accurate, which affects the transmission performance of the entire system, resulting in a decline in the overall performance of the system;

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
  • A sending method for reference signals
  • A sending method for reference signals
  • A sending method for reference signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In Embodiment 1, in the time domain direction, the OFDM symbols used to send the reference signal in the resource block pair of the subframe are the OFDM symbols occupied by the physical downlink control channel and the common pilot in the resource block pair. All OFDM symbols except the OFDM symbol; in the frequency domain direction, only one subcarrier is occupied on each OFDM symbol used to send the reference signal to send the reference signal.

[0067] The number (indicated by n) and the position of the OFDM symbols used to send the reference signal are specifically determined as follows:

[0068] (1) For MBSFN subframes, the value of n is 10; the position of the OFDM symbol used to send the reference signal is the rest after removing the first two OFDM symbols (ie, the first and second OFDM symbols) in a resource block pair of OFDM symbols;

[0069] (2) For a non-MBSFN subframe using a conventional cyclic prefix, set the number of symbols for transmitting the phy...

Embodiment 2

[0102] In the second embodiment, the position of the OFDM symbol used to send the reference signal in the resource block pair in the time domain direction is the same as that in the first embodiment, but in the frequency domain direction, two OFDM symbols used to send the reference signal are required. subcarriers to send reference signals.

[0103] It is the same as the manner of determining the reference signal pattern in the first embodiment. After the array B is obtained, according to the number n of OFDM symbols for transmitting the reference signal in the subframe, n columns of the array B are selected to correspond one-to-one with the n OFDM symbols used to send the reference signal. In the domain direction, two subcarriers need to be used to send reference signals on each OFDM symbol used to send reference signals, then select n and the n orthogonal frequency division multiplexing symbols from the N elements of the array A One-to-one correspondence, the value of any e...

Embodiment 3

[0117] In embodiment three, the requirements for the number and position of OFDM symbols used for sending OFDM symbols in the time domain and the number of subcarriers occupied by each OFDM symbol in the frequency domain are the same as those in embodiment two. Embodiment three and embodiment two The difference is that the method of determining the position of the subcarrier used to send the reference signal on each OFDM symbol according to the obtained array B is different.

[0118] In the third embodiment, after the array B is obtained, according to the number n of OFDM symbols for transmitting the reference signal in the subframe, two different sets of n column values ​​are selected in the array B for use with n OFDM symbols for transmitting the reference signal. For symbol correspondence, the positions of two subcarriers on n OFDM symbols used to send reference signals are determined, and the method for determining subcarriers is the same as that in Embodiment 2. The selec...

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 sending method for reference signals, which comprises the steps of determining different time frequency resources for target cells in the resource block pair of a subframe and sending the reference signal of the target cell corresponding to the time frequency resource in the time frequency resource of the subframe. The sending method of the invention is a method for sending reference signals in the target cells, which ensures that the time frequency positions for sending the positioning reference signals are different in the target cells, thereby reducing the interference among cells, ensuring the accurate positioning of the terminal, and improving the integral performance of the system.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for sending a reference signal. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM for short) technology is essentially a multi-carrier modulation communication technology, which is one of the core technologies in the fourth generation mobile communication. In the frequency domain, the multipath channel of the OFDM system exhibits frequency-selective fading characteristics. In order to overcome this fading, the channel is divided into multiple sub-channels in the frequency domain. The spectral characteristics of each sub-channel are approximately flat, and the OFDM system The sub-channels are orthogonal to each other, so the spectrum of the sub-channels is allowed to overlap each other, so that the spectrum resources can be utilized to the greatest extent. [0003] The Long Term Evolution (LTE) system is an important plan of the third gene...

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): H04L27/26H04W16/10H04W64/00
Inventor 戴博郁光辉李卫军徐俊
Owner 深圳市恒程汇文化科技有限公司
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