What is the significance of reserved MCS for retransmission?

Smriti · February 10, 2024, 3:00am

Hi Experts.

The reserved MCS doesn’t specify the code rate to be used, it just indicates the modulation order for the retransmission, then why do we use reserved MCS?

Instead we can use the non-reserved MCS indicating both code rate and modulation scheme.

Sakshama_Ghoslya · March 15, 2024, 4:06pm

38.214 for PUSCH MCS entries above 28 says:

Same is for PDSCH as well

Above is the only text I could found in spec related to reserved MCS

Sakshama_Ghoslya · March 15, 2024, 4:16pm

What is the advantage of having Reserved MCS (like 28, 29, 30, 31) for re-transmission if we already have the 27 different MCS that we can use?