Data transmission method and device for reducing loss of information bits

摘要

The present invention provides a method and a device for data transmission. The method includes: according to a preconfigured second table, selecting a TBS value, where the second table is used for describing a corresponding relationship among a TBS value, the number of RBs and a TBS index, the number of RBs corresponding to the selected TBS value is smaller than or equal to a specific value, a modulation mode corresponding to a TBS index which corresponds to the selected TBS value is QPSK, and the selected TBS value is capable of satisfying the rate requirement required during transmission time interval TTI bundling transmission; and according to the selected TBS value, transmitting data carried by a PUSCH using bundled TTIs. The embodiments of the present invention can improve the coverage at a PUSCH medium data rate.

主权项

1. A method for transmitting bits, which is used for reducing loss of information bits, comprising:
determining the number of bits that can be transmitted by bundled transmission time intervals (TTIs), and determining a rate matching output sequence length according to the number of the bits that can be transmitted by the bundled TTIs; determining a starting position for bit selection according to a unique redundancy version number, wherein during an initial transmission, the unique redundancy version number is 0; or, during a retransmission, the unique redundancy version number is 0, 1, 2 or 3; in a buffer for buffering a bit stream after subblock interleaving, starting to successively and circularly select bits whose length is the rate matching output sequence length from the starting position for the bit selection, and obtaining the rate matching output bits for each code block, wherein the bit stream after the subblock interleaving is a bit stream obtained after performing the subblock interleaving to a codestream that is obtained after performing cyclic redundancy check (CRC) addition, code block segmentation, code block CRC addition and coding to the information bits; performing code block cascading to the rate matching output bits for each code block; performing modulation to the code block-cascaded bits, and transmitting modulated symbols within each TTI of the bundled TTIs respectively.