Design of hybrid automatic repeat request (harq) feedback bits for polar codes

Abstract

Certain aspects of the present disclosure relate to techniques and apparatus for design of hybrid automatic repeat request (HARQ) feedback bits. The method generally includes obtaining a payload to be transmitted, partitioning the payload into a plurality of blocks, and partitioning each block of the plurality of blocks into a plurality of sections. The method also includes deriving redundancy check information for each section of the plurality of sections, and generating a plurality of codewords, each comprising a block of the plurality of blocks and the redundancy check information for each section of the block, wherein a location of each of the sections in the codewords is determined based on an error rate corresponding to each of the sections.

What is claimed is: 
     
         1 . A method for wireless communications, comprising:
 obtaining a payload to be transmitted;   partitioning the payload into a plurality of blocks;   partitioning each block of the plurality of blocks into a plurality of sections;   deriving redundancy check information for each section of the plurality of sections; and   generating a plurality of codewords, each comprising a block of the plurality of blocks and the redundancy check information for each section of the block, wherein a location of each of the sections in the codewords is determined based on an error rate corresponding to each of the sections.   
     
     
         2 . The method of  claim 1 , wherein the plurality of sections of each block comprises a first section, a second section, and third section, and wherein the first section of each block has a lower error rate than the second section of each block and the second section of each block has a lower error rate than the third section of each block. 
     
     
         3 . The method of  claim 2 , further comprising:
 receiving an indication that the first section of each block or the second section of each block was not properly decoded;   determining whether the third section of each block was properly decoded based on the indication; and   retransmitting the third section of each block based on the determination.   
     
     
         4 . The method of  claim 1 , further comprising receiving an indication of whether the plurality of sections of each block were properly decoded, wherein the plurality of sections of each block comprise at least three sections, and where the indication comprises a fewer number of bits than a number of sections of each block. 
     
     
         5 . The method of  claim 1 , further comprising:
 receiving an indication that two sections of each block were not properly decoded, wherein the indication comprises a bit corresponding to each of the two sections; and   re-transmitting the two sections of each block based on the indication.   
     
     
         6 . The method of  claim 1 , wherein the redundancy check information comprises a cyclic redundancy check (CRC). 
     
     
         7 . The method of  claim 1 , wherein the codewords are encoded using polar coding. 
     
     
         8 . A method for wireless communications, comprising:
 receiving a plurality of codewords, each comprising a plurality of blocks, wherein each of the plurality of blocks comprise a plurality of sections and redundancy check information for each section of the plurality of sections, wherein a location of each of the plurality of sections of each block is determined based on an error rate corresponding to each of the plurality of sections of each block;   decoding the plurality of sections of each block;   verifying whether the plurality of sections of each block were properly decoded based on the redundancy check information for each of the decoded sections; and   transmitting an indication of whether the plurality of sections of each block was properly decoded based on the verification.   
     
     
         9 . The method of  claim 8 , wherein the plurality of sections of each block comprises at least three sections, and where the indication comprises a fewer number of bits than a number of sections of the plurality of sections. 
     
     
         10 . The method of  claim 8 , wherein the plurality of sections of each block comprises a first section, a second section, and third section, and wherein the first section of each block has a lower error rate than the second section of each block and the second section of each block has a lower error rate than the third section of each block. 
     
     
         11 . The method of  claim 10 , wherein the indication comprises a first bit used to indicate whether the second section of each block was properly decoded and a second 
     
     
         12 . The method of  claim 8 , further comprising:
 transmitting an indication of whether two sections of each block were properly decoded based on the verification, wherein the indication comprises a bit corresponding to each of the two sections.   
     
     
         13 . The method of  claim 8 , wherein the redundancy check information comprises a cyclic redundancy check (CRC). 
     
     
         14 . The method of  claim 8 , wherein the decoding comprises performing CRC-aided successive cancellation list (CA-SCL) decoding based on the redundancy check information. 
     
     
         15 . The method of  claim 8 , wherein the codewords are encoded using polar coding. 
     
     
         16 . An apparatus for wireless communications, comprising:
 at least one processor configured to:
 obtain a payload to be transmitted; 
 partition the payload into a plurality of blocks; 
 partition each block of the plurality of blocks into a plurality of sections; 
 derive redundancy check information for each section of the plurality of sections; and 
 generate a plurality of codewords, each comprising a block of the plurality of blocks and the redundancy check information for each section of the block, wherein a location of each of the sections in the codewords is determined based on an error rate corresponding to each of the sections; and 
   a memory coupled to the at least one processor.   
     
     
         17 . An apparatus for wireless communications, comprising:
 at least one antenna;   a processing system configured to:
 receive, via the at least one antenna, a plurality of codewords, each comprising a plurality of blocks, wherein each of the plurality of blocks comprise a plurality of sections and redundancy check information for each sections of each block is determined based on an error rate corresponding to each of the plurality of sections of each block; 
 decode the plurality of sections of each block; 
 verify whether the plurality of sections of each block were properly decoded based on the redundancy check information for each of the decoded sections; and 
 transmit, via the at least one antenna, an indication of whether the plurality of sections of each block was properly decoded based on the verification. 
   
     
     
         18 . An apparatus for wireless communications, comprising:
 means for obtaining a payload to be transmitted;   means for partitioning the payload into a plurality of blocks;   means for partitioning each block of the plurality of blocks into a plurality of sections;   means for deriving redundancy check information for each section of the plurality of sections; and   means for generating a plurality of codewords, each comprising a block of the plurality of blocks and the redundancy check information for each section of the block, wherein a location of each of the sections in the codewords is determined based on an error rate corresponding to each of the sections.   
     
     
         19 . An apparatus for wireless communications, comprising:
 means for receiving, via the at least one antenna, a plurality of codewords, each comprising a plurality of blocks, wherein each of the plurality of blocks comprise a plurality of sections and redundancy check information for each section of the plurality of sections, wherein a location of each of the plurality of sections of each block is determined based on an error rate corresponding to each of the plurality of sections of each block;   means for decoding the plurality of sections of each block;   means for verifying whether the plurality of sections of each block were properly decoded based on the redundancy check information for each of the decoded sections; and   means for transmitting an indication of whether the plurality of sections of each block was properly decoded based on the verification.   
     
     
         20 . A computer-readable medium having instructions stored thereon for:
 obtaining a payload to be transmitted;   partitioning the payload into a plurality of blocks;   partitioning each block of the plurality of blocks into a plurality of sections;   deriving redundancy check information for each section of the plurality of sections; and   generating a plurality of codewords, each comprising a block of the plurality of blocks and the redundancy check information for each section of the block, wherein a location of each of the sections in the codewords is determined based on an error rate corresponding to each of the sections.   
     
     
         21 . A computer-readable medium having instructions stored thereon for:
 receiving a plurality of codewords, each comprising a plurality of blocks, wherein each of the plurality of blocks comprise a plurality of sections and redundancy check information for each section of the plurality of sections, wherein a location of each of the plurality of sections of each block is determined based on an error rate corresponding to each of the plurality of sections of each block;   decoding the plurality of sections of each block;   verifying whether the plurality of sections of each block were properly decoded based on the redundancy check information for each of the decoded sections; and   transmitting an indication of whether the plurality of sections of each block was properly decoded based on the verification.