DOWNLINK TRANSMISSION METHOD AND USER TERMINAL EQUIPMENT

• US 20190182847A1
• Filed: 01/31/2019
• Published: 06/13/2019
• 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
• Granted Patent: US 10,448,413 B2
• Time in Patent Office: 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, comprising:

receiving, from a base station, downlink control information (DCI) including information on a modulation and coding scheme (MCS);

receiving, from the base station, downlink data; and

processing the received data based on the information on the MCS and a MCS table among a plurality of MCS tables,

wherein each of the plurality of MCS tables indicates modulation orders and code rates,

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

wherein a number of MCS indexes in the first MCS table is equal to a number of MCS indexes in the second MCS table.

2. The method of claim 1, wherein MCS items in the first MCS table except at least one MCS item of 256 QAM are in the second MCS table, and

wherein at least one MCS item, each having a predetermined MCS index, an MCS item of 64 QAM with a highest coding rate, and an MCS item having overlapping spectral efficiency with another MCS item in the second CQI table are not in the first CQI table.

3. The method of claim 1, further comprising:

detecting a format of the DCI which is at least one of a first DCI format and a second DCI format;

processing the MCS based on the first MCS table, if the detected DCI format is the first DCI format; and

processing the MCS based on the second MCS table, if the detected DCI format is the second DCI format,

wherein the first DCI format has more bits than the second DCI format.

4. The method of claim 1, wherein the information on the MCS has 5-bits.

5. A user equipment (UE) comprising:

a transceiver; and

a controller coupled to the transceiver, wherein the controller is configured to;

receive, from a base station, downlink control information (DCI) including information on a modulation and coding scheme (MCS),

receive, from the base station, downlink data, and

process the received data based on the information on the MCS and a MCS table among a plurality of MCS tables,

wherein each of the plurality of MCS tables indicates modulation orders and code rates,

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

wherein a number of MCS indexes in the first MCS table is equal to a number of MCS indexes in the second MCS table.

6. The UE of claim 5, wherein MCS items in the first MCS table except at least one MCS item of 256 QAM are in the second MCS table, and

wherein at least one MCS item, each having a predetermined MCS index, an MCS item of 64 QAM with a highest coding rate, and an MCS item having overlapping spectral efficiency with another MCS item in the second CQI table are not in the first CQI table.

7. The UE of claim 5, wherein the controller is further configured to:

detect a format of the DCI which is at least one of a first DCI format and a second DCI format,

process the MCS based on the first MCS table, if the detected DCI format is the first DCI format, and

process the MCS based on the second MCS table, if the detected DCI format is the second DCI format,

wherein the first DCI format has more bits than the second DCI format.

8. The UE of claim 5, wherein the information on the MCS has 5-bits.