A downlink traffic channel sending method, user terminal and base station

Abstract

Embodiments of the present invention provide a downlink traffic channel sending method, a user terminal and a base station. The method includes receiving downlink control information sent by a base station, wherein the downlink control information includes at least the number of subbands, modulation and coding level, number of sub-frames and compression factor; wherein the compression factor is determined by the base station according to current channel conditions obtain; obtain the equivalent subband number according to the number of subbands and the compression factor; obtain the amount of data for subsequent transmission from the transmission block size table according to the equivalent number of subbands, the modulation and coding level and the number of subframes, the present invention In the embodiment, by adding a compression factor into the downlink control information, the number of equivalent subbands obtained by the user terminal is obtained, and the amount of data is obtained by querying the TBS table through the amount of equivalent subbands, so as to analyze the subsequent data signal , so as to reduce the demodulation threshold of the user terminal and improve the detection performance, so that the available frequency domain resources can be used more effectively and the system performance can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of wireless communication, and in particular, to a method for sending a downlink service channel, a user terminal and a base station. Background technique [0002] In the existing private network application scenarios, there are few frequency domain resources, such as smart grid data collection in power systems, when single sub-band transmission, only 20KHz bandwidth, 11 sub-carriers, refer to the TB table in the LTE protocol, when the channel conditions are good When PDSCH transmits a large transport block (Transport Block, TB) block, it is necessary to choose a high-MCS high-order modulation, such as 16QAM or 64QAM; when the channel condition is bad, you can sacrifice throughput and choose a low-MCS low-order modulation, such as QPSK. [0003] In order to enhance the coverage, it is necessary to use low-order modulation under low SNR to ensure performance and to transmit enough in...

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Problems solved by technology

[0005] Embodiments of the present invention provide a downlink service channel transmission method, user terminal and base station, which are used to solve the problem in the prior art that when the system transmission conditions deteriorate, even if the modulation and coding level is reduced to the lowest level that is the same as that of the single subband, the Realize a demodulation threshold similar to that of a single subband, but cannot further improve detection performance

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