Uplink FRC generation using 5g toolbox's NR Test Model Waveform Generation Example

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Itamar Jacoby 2021-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/780192-uplink-frc-generation-using-5g-toolbox-s-nr-test-model-waveform-generation-example

Hello,

I'm using the exapmle provided by 5g toolbox to generate TMs and FRCs waveforms (I have Matlab R2020b). While generating UL FRCs (For exapmle, G-FR1-A1-5) in TDD mode I noticed the allocated symbols in the special slot are ignored. Looking inside the helper functions I found that the special slot is defined as in Table 8.2.1.4.2-2 in 38.141, i.e. 7 DL, 1 S, 4 UL, with symbol allocation for the special slot of 6 DL, 4 G, 4 UL, but after this is defined the special slot is ignored. In the code (hNRReferenceWaveformGenerator, lines 1022-1028):

[~,tp] = getTDDConfiguration(tdef.FR,scs,linkdirection,1); 
tddmask = repmat(tp,1,ceil(pxsch.AllocatedPeriod/length(tp)));  
tddmask = tddmask(1:pxsch.AllocatedPeriod);                             % Mask across allocated period, where DL/UL only slots = 0
tddmask(pxsch.AllocatedSlots+1) = tddmask(pxsch.AllocatedSlots+1)-1;    % Set allocated DL/UL only = -1
pxsch.AllocatedSlots = find(tddmask<0)-1;