FIELD: communication technologies.
SUBSTANCE: terminal device obtains a modulation order, code rate, or spectral efficiency, selects a reference CQI index (or reference MCS index) from a previously stored mapping table based on the obtained modulation order, code rate, or spectral efficiency, and reports the reference CQI index (or index reference MCS) to the network device. In this case, the mapping table contains the following mapping relationships, which are applicable in low-delay ultra-reliable communication: the MCS index in the mapping table corresponds to modulation order 2, code rate 30, spectral efficiency 0.0586, and the actual code rate is obtained by dividing the code rate 30 by 1024; while the MCS index in the mapping table corresponds to modulation order 2, code rate 40, spectral efficiency 0.0781, and the actual code rate is obtained by dividing the code rate 40 by 1024.
EFFECT: technical result of the invention is improvement of reliability of data transmission.
18 cl, 6 dwg, 235 tbl
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