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

Retransmission method, retransmission apparatus and communication system

A technology of retransmission and retransmission indication, applied in the field of communication, can solve the problem of retransmission failure, the UE cannot know which precoding matrix to use, which is different, etc., to achieve the effect of reducing overhead

Active Publication Date: 2011-10-05
HUAWEI TECH CO LTD
View PDF3 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the use of multiple antennas in the uplink, when using closed-loop transmission, it is possible to transmit data of multiple layers, resulting in the transmission of 2 codewords of channel coding; if the initial transmission is 2 codewords of channel coding, and repeated The transmission is a channel-coded codeword. Since there may be no uplink grant (UL grant) signaling during retransmission, and the rank of retransmission is different from the rank of initial transmission, the UE cannot know what should be done during retransmission. Which precoding matrix to use, resulting in retransmission failure when there is no uplink permission signaling

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
  • Retransmission method, retransmission apparatus and communication system
  • Retransmission method, retransmission apparatus and communication system
  • Retransmission method, retransmission apparatus and communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0050] The retransmission method provided by the embodiment of the present invention is applied in the LTE-A system. Specifically, it is described that multiple input multiple output (MIMO: Multiple Input Multiple Output) is used for closed-loop transmission in the uplink, and when there is no UL grant for retransmission , if the initial transmission is two channel-coded codewords, the retransmission processing flow when one of the two channel-coded codewords needs ...

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 relates to the communication technology field, disclosing a retransmission method, a retransmission apparatus and a communication system. The retransmission method comprise the following steps: receiving a retransmission indication after sending code words of two channel coding in first transmission, wherein the retransmission indication comprises the identification of the code wordof a channel coding which needs to be retransmitted; according to the preset phase positions of each symbol, determining precoding matrix of each symbol of code word of the channel coding which needsto be retransmitted, wherein the phase relationship of each symbol is fixed; and using the precoding matrix to encode each symbol of code word of the channel coding which needs to be retransmitted, and sending the coding through antenna. According to the invention, the success of retransmission for UE is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a retransmission method, device and communication system. Background technique [0002] In the long-term evolution (LTE: Long Term Evolution), considering that the uplink transmission power of the user equipment (UE: User Equipment) is limited, in order to reduce the cubic measure (CM: Cubic Metric) characteristics of the transmitted signal, single-carrier frequency division is used in the uplink Multiple access (SC-FDMA: single carrier frequency division multiple access) is used as a multiple access method. In LTE-Advanced Evolution (LTE-A), uplink adopts SC-FDMA in LTE as the uplink multiple access method, and in LTE-A, up to four transmit antennas can be supported to transmit simultaneously. [0003] Due to the use of multiple antennas in the uplink, when using closed-loop transmission, it is possible to transmit data of multiple layers, resulting in the transmi...

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): H04L1/18H04L1/00H04L69/40
CPCH04L1/06H04B7/0639H04L1/1893
Inventor 吴强周永行
Owner HUAWEI TECH CO LTD
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