Rate matching using low-density parity-check codes

An apparatus of a receiver operable to perform data receptions using low density parity check (LDPC) codes, the apparatus comprising one or more processors and memory configured to:

• determine soft buffer information (Nsoft) for the receiver, wherein the soft buffer information (Nsoft) is associated with a component carrier, wherein a soft buffer partition per hybrid automatic repeat request (HARQ) process (NIR) is based on the soft buffer information (Nsoft) and a reference number of HARQ processes;
• obtain, for a transport block, a number of code block segments (C) and at least one code block segment size value associated with the transport block based on a code block segmentation;
• determine, at the receiver, an amount of soft buffer available for at least one code block segment (Ncb) based on the soft buffer partition per HARQ process (NIR), the number of code block segments (C), and a shift size value (z) associated with an LDPC coding scheme to be used for decoding log-likelihood ratios (LLRs) corresponding to the at least one code block segment;
• obtain, at the receiver, LLRs associated with the at least one code block segment;
• decode, at the receiver, the LLRs associated with the at least one code block segment;
• and
• store, at the receiver, at least a portion of the LLRs in a soft buffer associated with the at least one code block segment when decoding fails at the receiver.

An apparatus of an eNodeB operable to perform data transmissions using low density parity check (LDPC) codes, the apparatus comprising one or more processors and memory configured to:

• determine, at the eNodeB, soft buffer information (Nsoft) for a user equipment (UE);
• determine, at the eNodeB, an amount of soft buffer available for at least one code block segment (Ncb) based on a soft buffer partition per HARQ process (NIR), a number of code block segments (C), a shift size value (z), and a total number of coded bits obtained when the code block segment is encoded using a mother code rate of an LDPC coding scheme (Kw);
• and
• encode, at the eNodeB, the at least one code block segment based on the LDPC coding scheme to obtain encoded parity bits.

At least one non-transitory machine readable storage medium having instructions embodied thereon for performing data receptions using low density parity check (LDPC) codes, the instructions when executed perform the following:

• determining, using one or more processors at the UE, soft buffer information (Nsoft) for the UE, wherein the soft buffer information (Nsoft) is associated with a component carrier, wherein a soft buffer partition per hybrid automatic repeat request (HARQ) process (NIR) is based on the soft buffer information (Nsoft) and a reference number of HARQ processes;
• obtaining, using the one or more processors at the UE, for a transport block, a number of code block segments (C) and at least one code block segment size value associated with the transport block based on a code block segmentation;
• determining, using the one or more processors at the UE, an amount of soft buffer available for at least one code block segment (Ncb) based on the soft buffer partition per HARQ process (NIR), the number of code block segments (C), a shift size value (z) associated with an LDPC coding scheme to be used for decoding log-likelihood ratios (LLRs) corresponding to the at least one code block segment, and a total number of coded bits obtained when the code block segment is encoded using a mother code rate of the LDPC coding scheme (Kw);
• obtaining, using the one or more processors at the UE, the LLRs associated with the at least one code block segment;
• decoding, using the one or more processors at the UE, the LLRs associated with the at least one code block segment;
• and
• storing, using the one or more processors at the UE, at least a portion of the LLRs in a soft buffer associated with the at least one code block segment when decoding fails at the UE, wherein the LLRs are stored in the soft buffer based on a redundancy version index (rvidx), wherein the redundancy version index (rvidx) indicates a starting point that is aligned with the shift size value (z) associated with the LDPC coding scheme.