NTT DOCOMO proposes BG1, BG2 and BG3 selection study at RAN1 #126

RAN1, the radio layer 1 working group, had an earlier NTT DOCOMO contribution at RAN1 #125. Its study request began with a condition: "If introducing a new BG is agreed". The conditional study would consider applying New Radio (NR) low-density parity-check (LDPC) coding within NR's data-rate range as much as possible. It would also consider where sixth-generation radio (6GR) LDPC coding can be applied beyond that range. The document register marked the contribution not treated, meaning it was not handled at that meeting.

Source: R1-2604733, NTT DOCOMO, 3GPP TSG RAN WG1 #125. © NTT DOCOMO.

At RAN1 #126, NTT DOCOMO proposed: "RAN1 shall study BG selection rule for the set of BG1/BG2/BG3". Our reading: the later study request drops the earlier condition, changes should to shall, and names BG3. Our reading: BG1/BG2 is the existing graph pair, while BG3 is the additional graph under discussion. The first alternative switches between BG3 and the BG1/BG2 pair, or only between BG3 and BG1. The second uses transport block size (TBS) and code rate to choose among all three graphs. Code rate describes the share of useful bits after coding. The register marked the RAN1 #126 contribution not treated and recorded no decision.

Source: R1-2606494, NTT DOCOMO, 3GPP TSG RAN WG1 #126. © NTT DOCOMO.