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Can we have different MCS scheme per PRB instead of Group of PRBs in case of sub band CQI report?

+1 vote

Since eNodeB can have information about channel quality with finer granularity through selected
subband CQI, wouldn’t it make sense to have MCSs defined on a per‐RB (or a group of RB) basis rather
than a single MCS per UE across all allocated RBs for a codeword?

posted Mar 10, 2019 by Gnanendra Reddy

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1 Answer

0 votes


The problem is UE has to decode all the RB's in different demodulation. it increase the complexity at UE side and leads to processing
delay. Even at ENB it increase the processing delay, say E.g 100 RB's are using difference MCS the ENB has to code in each RB's so it increase the complexity.

Moreover Each RB's CQI will not vary drastically. it will be sub band CQI variation, so using multiple RB's in the same Sub band will be feasible solution and reduce complexity.

Lets see PHY Expert opinions. :)

answer Mar 11, 2019 by Jaganathan
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+1 vote

why QPSK modulation scheme is used for all control channels in LTE ?

+3 votes

EnodeB considers CQI feedback from the UE before creating the transport block.
As per my understanding PUCCH resource allocation is not very dynamic. In this case how UE decide to use a specific MCS (Modulation and Coding Scheme) while using PUCCH channel ?