The SINR data fluctuation problem in the Pusch channel

[baolindong]

Hi,
During the demodulation of the pusch channel, I used the result of frequency domain interpolation in the channel estimation process to calculate the sinr data of each RB. However, we found that the data had some abnormal jumps. Later, we found that the data jumps may be related to the number of RBs used in the slot.
We found that the sinr data tends to decrease as the number of RBs used increases.
Below is a three-dimensional graph of sinr that I drew, where the x-axis is the slot index, the y-axis is the RB index, and the z-axis is the sinr value.

When I filter the data based on the number of RBs used in each slot, and plot the slots with similar numbers of RBs together, the resulting data becomes smoother. Below is the 3D graph of sinr I got, Figure 2 shows the number of RBs less than 6, Figure 3 shows the number of RBs between 7 and 16, Figure 4 shows the number of RBs between 17 and 24, and Figure 5 shows the number of RBs greater than 24.

!fig3](https://github.com/user-attachments/assets/6807054e-c12c-49b1-9ed4-773c1e81dd89)


We speculate that this phenomenon is related to power control. We turned off OLA when the base station was running. The above picture is the result obtained when olla is turned off.
I would like to ask you what may be the reason for the decrease of sinr data as the number of RBs increases. In addition to TCP and olla, is there any other power control in the system? Is the user-side sending power the same as the total power of each slot and then evenly distributed to each RB, or will the power be adjusted dynamically? Thank you so much!