Implicit derivation of frequency synchronization from dmrs assignment

A frequency domain, time-frequency resource technology, applied in the field of wireless communication networks, can solve the problems of increased overhead, complicated reference signal synchronization process, and reduced data rate, and achieve the effect of reducing overhead

Active Publication Date: 2018-08-31
TELEFON AB LM ERICSSON (PUBL)
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the latter has the problem that the inability to rely on an always available reference signal makes the synchronization process more complicated
Also, overhead can increase in terms of sync signals using most of the spectrum, reducing the achievable data rate

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
  • Implicit derivation of frequency synchronization from dmrs assignment
  • Implicit derivation of frequency synchronization from dmrs assignment
  • Implicit derivation of frequency synchronization from dmrs assignment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] As mentioned above, some proposals for the preliminary design of next-generation systems involve a streamlined system design that eliminates some reference signals. However, the problem with these proposals is that the synchronization process, which can no longer rely on an always available reference signal, becomes more complicated. Additionally, overhead can increase when synchronization signals use a large portion of the spectrum, reducing the achievable data rate.

[0044] For example, one possible way is to reuse DMRS symbols for frequency synchronization. (In this disclosure, unless the context dictates otherwise, the term "DMRS" refers to a demodulation reference signal, which may include one or more demodulation reference signal symbols or "DMRS symbols"). It should be understood that DMRS symbols are primarily intended for channel estimation to allow demodulation of transmitted user data. However, reusing DMRS symbols for the purpose of frequency synchronizat...

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

Techniques are disclosed for transmitting and receiving a user-specific transmission comprising user data symbols and user-specific reference signal symbols. According to one aspect, a method comprises transmitting, within a group of time-frequency resources scheduled in a first time interval for a first user, a plurality of demodulation reference signal (DMRS) symbols, where the plurality of DMRSsymbols within the group of time-frequency resources are more densely arranged in the frequency domain than in the time domain; and transmitting, within the group of time-frequency resources scheduled in the first time interval for the first user, a plurality of synchronization signal (SS) symbols, where the plurality of SS symbols within the group of time-frequency resources are more densely arranged in the time domain than in the frequency domain.

Description

technical field [0001] The present invention relates generally to wireless communication networks, and in particular to frequency synchronization based on user-specific reference symbols. Background technique [0002] The so-called Long Term Evolution (LTE) wireless communication network, developed by members of the 3rd Generation Partnership Project (3GPP), uses Orthogonal Frequency Division Multiplexing (OFDM) in the downlink and Discrete Fourier in the uplink Leaf Transform Spread (DFT Spread) OFDM (also known as Single Carrier Frequency Division Multiple Access or FDMA). Therefore, basic LTE downlink physical resources can be viewed as figure 1 A time-frequency grid is shown, where each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval. An uplink subframe has the same subcarrier spacing / bandwidth as the downlink, and has the same number of single-carrier FDMA (SC-FDMA) symbols in the time domain as OFDM symbols in the downlink. [000...

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 Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0051H04L5/006H04W72/23H04L5/0007H04L5/0048
Inventor 马丁·赫斯勒亨利克·萨林罗伯特·巴尔德麦尔拉尔斯·林德布姆
Owner TELEFON AB LM ERICSSON (PUBL)
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