EP-3379748-B1 - METHOD AND APPARATUS FOR WIRELESS COMMUNICATION USING MODULATION, CODING SCHEMES, AND CHANNEL QUALITY INDICATORS

Inventors

• KWON, YANG SOO
• KIM, JEONG HUN
• JUNG, YOUNG-SEOK
• KIM, MIN-GOO
• KIM, IN-HYOUNG
• RHEE, JONG-HUN

Dates

Publication Date

20260506

Application Date

20180320

Claims (1)

1. A wireless communication method comprising: transmitting, by a user equipment, UE, table support information indicating availability of a third Modulation and Coding Scheme, MCS, table (T_256MCS') to a base station (eNB); receiving, through a wireless channel by the user equipment, UE, table indication information indicating one of three MCS tables (T_64MCS, T_256MCS, T_256MCS'), of which a first MCS table (T_64MCS) supporting up to 64 Quadrature Amplitude Modulation, QAM is: MCS INDEX MODULATION ORDER TBS INDEX 0 2 0 1 2 1 2 2 2 3 2 3 4 2 4 5 2 5 6 2 6 7 2 7 8 2 8 9 2 9 10 4 9 11 4 10 12 4 11 13 4 12 14 4 13 15 4 14 16 4 15 17 6 15 18 6 16 19 6 17 20 6 18 21 6 19 22 6 20 23 6 21 24 6 22 25 6 23 26 6 24 27 6 25 28 6 26/26A 29 2 RESERVED 30 4 31 6 a second MCS table (T_256MCS) supporting up to 256 QAM is: MCS INDEX MODULATION ORDER TBS INDEX 0 2 0 1 2 2 2 2 4 3 2 6 4 2 8 5 4 10 6 4 11 7 4 12 8 4 13 9 4 14 10 4 15 11 6 16 12 6 17 13 6 18 14 6 19 15 6 20 16 6 21 17 6 22 18 6 23 19 6 24 20 8 25 21 8 27 22 8 28 23 8 29 24 8 30 25 8 31 26 8 32 27 8 33/33A 28 2 RESERVED 29 4 30 6 31 8 and the third MCS table (T_256MCS') supporting up to 256 QAM is: MCS INDEX MODULATION ORDER TBS INDEX 0 2 0 1 2 2 2 2 4 3 2 6 4 2 8 5 4 10 6 4 11 7 4 12 8 4 13 9 4 14 10 4 15 11 6 16 12 6 17 13 6 18 14 6 19 15 6 20 16 6 21 17 6 22 18 6 23 19 6 24 20 6 25 21 6 27 22 6 28 23 6 29 24 8 30 25 8 31 26 8 32 27 8 33/33A 28 2 RESERVED 29 4 30 6 31 8 wherein the third MCS table (T_256MCS') including a same number of MCS indices as the second MCS table (T_256MCS) and including less MCS indices corresponding to 256 QAM than the second MCS table (T_256MCS); wherein the first, second and third MCS tables each include MCS indices, modulation orders corresponding to the MCS indices, and transport block size, TBS, indices corresponding to the MCS indices, and identifying by the user equipment, UE, one of the first to third MCS tables (T_64MCS, T_256MCS, T_256MCS') according to the received table indication information to recognize a demodulation scheme for data to be received through the wireless channel, wherein at least some of MCS indices corresponding to 256 QAM in the second MCS table (T_256MCS) correspond to 64 QAM in the third MCS table (T_256MCS'), each of the second and third MCS tables (T_256MCS, T_256MCS') comprises MCS indices 0 to 31 that are expressed in 5 bits, the second MCS table (T_256MCS) comprises MCS indices 20 to 27 corresponding to 256 QAM, and the third MCS table (T_256MCS') comprises MCS indices 20 to 23 corresponding to 64 QAM, wherein the wireless communication method further comprises: generating, by a base station (eNB), a MCS index as one of the MCS indices 20 to 23 when the third MCS table (T_256_MCS') is indicated by the table indication information so that a modulation order is 64 QAM providing more throughput than 256 QAM corresponding to MCS indices 20 to 23 in the second MCS table (T_265MCS); receiving, by the user equipment, UE, the MCS index from the base station (eNB); and identifying, by the user equipment, UE, the modulation order and the transport block size based on the identified MCS table and the received MCS index.

Description

BACKGROUND The inventive concepts relate to wireless communications, and more particularly, to wireless communication methods using modulation, coding schemes, and channel quality indicators. A wireless communication system may increase a modulation order of a modulation scheme as one of various schemes of increasing a throughput in the wireless communication system. For instance, 256 Quadrature Amplitude Modulation (QAM) is used for Long Term Evolution (LTE), and 256 QAM may provide a maximum throughput that is increased about 33% or more than 64 QAM. However, according to situations, a modulation scheme having a high modulation order provides a lower throughput than a modulation scheme having a low modulation order due to, for example, high complexity. As an example, the US 2016/036618 A1 discloses a wireless communication method which provides two or more MCS-tables, the tables differing by their entries of highest-order modulation. The first MCS-table and the second MCS-table have a plurality of modulation and coding schemes in common. These MCS-tables have the same length in order to be addressable by the same modulation and coding scheme indicator. They differ by the entries of the highest-order modulation, i.e. they differ in that the second MCS-table and a third MCS-table further mandatory include a modulation with an order higher than any modulation in the previous MCS-table, wherein the two or more MCS-tables have the same size. With the help of the proposed method and MCS-tables, the spectral efficiency of a wireless transmission should be increased. WO 2016/190804 A1 discloses methods and an apparatus for a wireless device and network node are disclosed. A network node determines at least two or more channel quality tables and configures a wireless device with these ate least two tables. The wireless device selects one out of the at least two channel quality tables for estimating the channel quality wherein the selecting is based on a criterion. The wireless device may report the result of a channel quality estimation and may report an indication of the selected channel quality table. WO 2016/164074 A1 discloses user equipment, UE, an evolved NodeB, eNB, and a method of increasing the data rate for 4x4 MIMO at 256QAM. The UE may initially determine whether the eNB supports 256QAM from an RRC configuration message. The UE may then receive and measure reference signals from the eNB. The UE may determine a CQI value and use this value to determine a MCS and code rate with which to communicate with the eNB based on table entries using a reduced reference signal overhead compared with a legacy reference signal overhead. The UE may transmit a CQI report to the eNB and subsequently communicate with the eNB using the determined characteristics. EP 2 667 533 A1 and US 2015/312082 A1 disclose a method and a device for feeding back a signal to interference plus noise ratio, which can use a CQI to effectively feed back an SINR. An embodiment this prior art document provides a method for feeding back a signal to interference plus noise ratio, including: obtaining a data transmission mode, a resource utilization mode, or a user equipment type for performing data transmission; determining a CQI table or CQI section corresponding to the data transmission mode, the resource utilization mode, or the user equipment type; obtaining, by measurement, an SINR value of a downlink channel for performing the data transmission; determining, according to the determined CQI table or CQI table section corresponding to the data transmission mode, the resource utilization mode, or the user equipment type, and the obtained SINR value, a CQI corresponding to the SINR value; and feeding back the determined CQI to a network side entity. Further prior art is in ZTE: "Evaluation and standard impact on EVM and receiver impairment for small cell 256QAM", 3GPP DRAFT; R1-135348 EVALUATION AND STANDARD IMPACT ON EVM AND RECEIVER IMPAIRMENT FOR SMALL CELL 256QAM, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES, vol. RAN WG1, no. San Francisco, USA; 20131111 - 20131115 13 November 2013 (2013-11-13), XP050735031; and in QUALCOMM INCORPORATED ET AL: "Discussion on modulation enhancements", 3GPP DRAFT; R1-1720390 DISCUSSION ON MODULATION ENHANCEMENTS, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20171127 - 20171201 18 November 2017 (2017-11-18), XP051369953. SUMMARY The inventive concepts provide wireless communication methods for effectively controlling a modulation scheme used for data reception/transmission in a wireless communication system. The invention is defined in the appended independent claim. BRIEF DESCRIPTION OF THE DRAWINGS Example embodiments of the inventive concepts will be more clearly understood from the following detailed description taken in conjunction with