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Downlink transmission method and user terminal equipment

A technology of user terminal equipment and transmission method, applied in the field of downlink transmission method and user terminal equipment

Active Publication Date: 2020-06-02
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consistent with the MCS configuration in the existing LTE version, in the CQI measurement, currently only supports downlink data transmission based on QPSK, 16QAM and 64QAM

Method used

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  • Downlink transmission method and user terminal equipment
  • Downlink transmission method and user terminal equipment
  • Downlink transmission method and user terminal equipment

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Embodiment Construction

[0077] In order to make the purpose, technical means and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0078] The existing version of LTE only supports three kinds of modulation methods such as QPSK, 16QAM and 64QAM. These three modulation methods cover the transmission requirements in various typical situations. That is, it supports QPSK-based transmission when the channel condition is very poor and 64QAM-based transmission when the channel condition is good. Only in some scenarios where the SINR is particularly high, can the downlink transmission be performed based on 256QAM, thereby increasing the downlink peak rate. In fact, even in the case of good channel conditions, considering the dynamic changes of interference, fast and slow link fading, corner effects, etc., the link status of the UE is not always suitable for downlink transmission based on 256QAM. T...

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Abstract

The invention discloses a downlink transmission method and user terminal equipment, and the method comprises the following steps: UE receives configuration information transmitted by a base station, and correspondingly adjusts a CQI table and an MCS table; the UE measures and reports downlink channel quality information to a base station, wherein the UE can report the CQI information according toa backward compatible CQI table or a CQI table supporting 256QAM modulation; the UE receives downlink scheduling information sent by the base station and correspondingly receives downlink data sent bythe base station, and the UE can process the MCS information in the DCI information according to a backward compatible MCS table or an MCS table supporting 256QAM modulation. The method and the equipment of the present invention can be used to generate a CQI table and an MCS table supporting 256QAM transmission, and support the selection of a CQI / MCS table using a conventional LTE standard or theselection of a CQI / MCS table supporting 256QAM according to the link state of the UE.

Description

technical field [0001] The present invention relates to a wireless communication system, and more specifically relates to a downlink transmission method and user terminal equipment. Background technique [0002] In the 3GPP LTE system, the length of each radio frame is 10ms, which is equally divided into 10 subframes. A downlink transmission time interval (TTI) is defined on a subframe. Such as figure 1 As shown, each downlink subframe includes two slots, and for the normal cyclic prefix (CP) length, each slot includes 7 OFDM symbols; for the extended CP length, each slot includes 6 OFDM symbols. In each subframe, the first n OFDM symbols, n equal to 1, 2 or 3, are used to transmit downlink control information, including physical downlink control channel (PDCCH) and other control information; the remaining OFDM symbols are used to transmit PDSCH or enhanced PDCCH (EPDCCH). The granularity of resource allocation is a physical resource block (PRB). A PRB includes 12 consec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04W72/04
Inventor 李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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