Spreadtrum · 10.3.1

Spreadtrum/UNISOC proposes that the LDPC extension beyond NR range retain the maximum code block size of 8448 and 22 information columns in the base graph, arguing that the 22×384 configuration fully preserves the NR LDPC structure and enables maximum reuse of existing implementations without altering base graph design, decoding schedule, or memory access patterns. They present a technical case against increasing the number of information columns to 33 or 44, citing increased scheduling complexity, more fragmented memory access, and reduced parallel processing efficiency, especially when combined with a reduced lifting size such as 192 or 256. For Polar code design for DCI with payload size larger than NR range, they propose prioritizing code block segmentation (Option 1) and interleaver removal (Option 2) as the options offering the highest degree of compatibility with the existing design architecture, while seven other candidate options including Mid-Block Termination-Assisted Polar Codes, zero-embedding, PAC codes with zero-padding, and new data integrity check mechanisms are acknowledged but not preferred.

Spreadtrum/UNISOC proposes that LDPC extension for 6G should maintain high consistency with existing NR LDPC, with only minor software or hardware modifications, and argues implementation-based solutions should receive priority consideration if they can meet data rate requirements. They specifically propose prioritizing reduction of the maximum number of iterations without significantly affecting performance for data channel coding. For control channel coding, they propose directly reusing NR Polar code design for control information within NR range, and if DCI payload size must exceed the 164-bit limit, they propose removing the D-CRC interleaver and reusing the existing 1024 sequence for UCI to extend the DCI payload upper bound.