Hi Madhusoodan,
To incorporate special subframes with 4 uplink symbols in a 5G NR TDD configuration using MATLAB's 5G Toolbox, you'll need to customize the TDD pattern to accommodate the specific requirement of having a special subframe. The 5G Toolbox provides flexibility in configuring the TDD pattern, but it requires manual adjustments to the slot and symbol allocation.
Here's a step-by-step approach to achieve this:
Step 1: Understand the TDD Pattern
The TDD pattern is defined by a combination of downlink slots, uplink slots, and special subframes. The special subframes can include a mix of downlink, guard, and uplink symbols. In your case, you want a special subframe with 4 uplink symbols.
Step 2: Customize the TDD Configuration
You will need to adjust the SymbolAllocation and SlotAllocation properties in the configuration to reflect your desired TDD pattern.
Step 3: Modify the MATLAB Configuration
Here's how you can modify the configuration to include a special subframe with 4 uplink symbols:
% Define the uplink reference waveform configuration
ulnrref = 'G-FR1-A1-5';
bw = 100; % Bandwidth in MHz
scs = 30; % Subcarrier spacing in kHz
dm = 'TDD'; % Duplex mode
ncellid = 1; % Cell ID
% Generate the reference waveform
ulrefwaveformgen = hNRReferenceWaveformGenerator(ulnrref, bw, scs, dm, ncellid);
% Modify the PUSCH configuration to include special subframe
% Assuming you want the special subframe in the 10th slot
ulrefwaveformgen.Config.PUSCH{1, 1}.SymbolAllocation = [0, 14]; % Full slot allocation
ulrefwaveformgen.Config.PUSCH{1, 1}.SlotAllocation = [8, 9, 18, 19]; % Example slot allocation
% Add a special subframe with 4 uplink symbols
specialSlotIndex = 10; % Define the slot index for the special subframe
specialSymbolAllocation = [10, 4]; % Start at symbol 10, with 4 uplink symbols
% Update the configuration for the special subframe
ulrefwaveformgen.Config.PUSCH{1, 2}.SymbolAllocation = specialSymbolAllocation;
ulrefwaveformgen.Config.PUSCH{1, 2}.SlotAllocation = specialSlotIndex;
% Generate the waveform
[ulWaveform, ulInfo] = ulrefwaveformgen();
% Display the configuration
disp(ulrefwaveformgen.Config);
Key Points:
- You specify which slots are used for uplink transmissions. The SlotAllocation array determines which slots are allocated for uplink within the TDD frame.
- The SymbolAllocation specifies which symbols within a slot are used for uplink. For the special subframe, you set this to start at a specific symbol and include the desired number of uplink symbols.
- The 5G Toolbox allows for significant customization of TDD patterns, but the specific pattern must comply with the overall TDD configuration rules.
