Polar code transmission method and apparatus

A transmission method, applied to a terminal and comprising:

• receiving, by the terminal, a symbol sequence, wherein the symbol sequence is obtained by a network device after the network device encodes control information by using a polar code, and scrambles, modulates, and maps encoded control information;
• demapping and demodulating, by the terminal, the symbol sequence, to obtain an encoded sequence;
• selecting, by the terminal, at least one encoded subsequence from the encoded sequence;
• performing, by the terminal, polar decoding on the at least one encoded subsequence, to obtain a bit sequence, wherein the bit sequence comprises the control information and a Cyclic Redundancy Check (CRC) sequence;
• and
• performing, by the terminal, a descrambling operation on the bit sequence by using at least one descrambling sequence, and performing a CRC check on a descrambled bit sequence, to obtain the control information and timing information if the CRC check succeeds,
• wherein the performing, by the terminal, the polar decoding on the at least one encoded subsequence comprises:
• decoding, by the terminal, one encoded subsequence and
• wherein the performing, by the terminal, the descrambling operation on the bit sequence by using the at least one descrambling sequence, and the performing the CRC check on the descrambled bit sequence comprises:
• performing, by the terminal, the descrambling operation on the bit sequence by using each of four descrambling sequences, and further performing CRC check on the descrambled bit sequence obtained each time, to obtain the control information if the CRC check succeeds;
• and
• obtaining, by the terminal, the timing information based on a sequence number of a descrambling sequence corresponding to the successful CRC check.

A transmission apparatus, comprising:

• a processor;
• and
• a memory storing instructions that when executed configure the processor to perform steps comprising:
• receiving a symbol sequence, wherein the symbol sequence is obtained by a network device after the network device encodes control information by using a polar code, and scrambles, modulates, and maps encoded control information;
• demapping and demodulating the symbol sequence, to obtain an encoded sequence;
• selecting at least one encoded subsequence from the encoded sequence;
• performing polar decoding on the at least one encoded subsequence, to obtain a bit sequence, wherein the bit sequence comprises the control information and a Cyclic Redundancy Check (CRC) sequence;
• performing a descrambling operation on the bit sequence by using at least one descrambling sequence;
• and
• performing a CRC check on the bit sequence after performing the descrambling operation, to obtain the control information and timing information if the CRC check succeeds,
• wherein the performing the polar decoding on the at least one encoded subsequence comprises:
• decoding one encoded subsequence;
• and
• wherein the performing the descrambling operation on the bit sequence and the performing the CRC check on the bit sequence, after performing the descrambling operation comprises:
• performing a descrambling operation on the bit sequence by using each of four descrambling sequences, and further performing a CRC check on a descrambled bit sequence obtained each time, to obtain the control information if the CRC check succeeds;
• and
• obtaining the timing information based on a sequence number of a descrambling sequence corresponding to the successful CRC check.