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Table 3 Subband size (S) and number of subbands (M) vs. system bandwidth for user-selected feedback

From: Adaptive CSI and feedback estimation in LTE and beyond: a Gaussian process regression approach

System bandwidth Subband size M
\(N_{\textit {PRB}}^{DL}\) (S)  
6–7 NA NA
8–10 2 1
11–26 2 3
27–63 3 5
64–110 4 6