Downlink transmission method and user terminal equipment

• US 10,455,594 B2
• Filed: 07/10/2018
• Issued: 10/22/2019
• Est. Priority Date: 09/03/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Li, Yingyang, Sun, Chengjun
• Primary Examiner(s): Onamuti, Gbemileke J
• Application Number:
  US16/031,317
• Publication Number:
  US 20180332597A1
• Time in Patent Office: 469 Days
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/366 Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Disclosed is a downlink transmission method that includes UE receiving configuration information sent form base station and accordingly adjusting CQI table and MCS table; UE measuring and reporting downlink channel quality indicator information to the base station; with the UE reporting the CQI information according to a backward compatible CQI table or a CQI table which supports 256 QAM modulation; and the UE receiving downlink scheduling information sent from the base station, receiving accordingly downlink data sent from the base station, with the UE processing the MCS information according to a backward compatible MCS table or a MCS table which supports 256 QAM modulation.

Claims

1. A method for communication by a user equipment (UE) in a wireless communication system, the method comprising:

performing measurement of a downlink channel; and

reporting information on a channel quality indicator (CQI) based on the measurement and a CQI table among a plurality of CQI tables,

wherein each of the plurality of CQI tables indicates modulations and code rates for reporting the CQI,

wherein the plurality of CQI tables comprises a first CQI table which supports 256 QAM and a second CQI table which does not support 256 QAM, and

wherein a number of CQI indexes in the first CQI table is equal to a number of CQI indexes in the second CQI table, and

wherein a CQI item of 64QAM with a highest coding rate in the second COI table is not in the first COI table.

2. The method of claim 1, wherein the CQI is based on the first CQI table or the second CQI table according to a configuring information from a base station (BS).

3. The method of claim 1,

wherein CQI items in the first CQI table except at least one CQI item of the 256 QAM are in the second CQI table, and

wherein at least one of CQI items each having a predetermined CQI index is not in the first CQI table.

4. A user equipment (UE) comprising:

a transceiver; and

a controller coupled to the transceiver,

wherein the controller is configured to;

perform measurement of a downlink channel, and

report information on a channel quality indicator (CQI) based on a CQI table among a plurality of CQI tables

wherein each of the plurality of CQI tables indicates modulations and code rates for reporting the CQI,

wherein the plurality of CQI tables comprises a first CQI table which supports 256 QAM and a second CQI table which does not support 256 QAM, and

wherein a number of CQI indexes in the first CQI table is equal to a number of CQI indexes in the second CQI table, and

wherein a CQI item of 64QAM with a highest coding rate in the second CQI table is not in the first CQI table.

5. The UE of claim 4, wherein the CQI is based on the first CQI table or the second CQI table according to a configuring information from a base station (BS).

6. The UE of claim 4,

wherein CQI items in the first CQI table except at least one CQI item of the 256 QAM are in the second CQI table, and

wherein at least one of CQI items each having a predetermined CQI index is not in the first CQI table.