NR Cell Search and MIB and SIB1 Recovery version difference

I updated from R2022b to R2023b prerelease.

And we've seen some SIB1s that fail in R2022b succeed in R2023b.

Can you tell me what changed from R2022b to R2023b?

R2022b ------------------------------------------------------------

-- Downlink control information message search in PDCCH --

Decoded PDCCH candidate #1 at aggregation level 4

PDCCH RMS EVM: 3.802%

PDCCH CRC: 0

-- PDSCH demodulation and DL-SCH decoding --

PDSCH RMS EVM: 38.883%

PDSCH CRC: 1 SIB1 decoding failed.

R2023b prereleass ------------------------------------------------------------

-- Downlink control information message search in PDCCH --

Decoded PDCCH candidate #3 at aggregation level 4

PDCCH RMS EVM: 3.901%

PDCCH CRC: 0

-- PDSCH demodulation and DL-SCH decoding --

4000002464014044280028000000000000

PDSCH RMS EVM: 23.683%

PDSCH CRC: 0

SIB1 decoding succeeded.

Answer 1

[Jongmin Kim]

Thank you for your answer.

I tried running example files from 2023b prereleass on 2022b.

but it didn't work.

Accordingly, I believe that there are additional changes in addition to the example files provided.

I will contact the engineer as suggested.

thank you

Answer 2

[Song-Hyun Ji]

Did you use signal created by "NRDownlinkWaveformGenerationExample.m" in '5G NR Downlink Vector Waveform Generation' instead of the signal in 'capturedWaveformSIB1.mat' to create a static signal or read a signal from a file as the option in 'NR Cell Search MIB and SIB1 Recovery'?

Answer 3

[Jongmin Kim]

I'm not generating the waveform in matlab, I'm analyzing the data from the base station. We use loadFromFile = 1 in the example.

Based on the waveform standards of new base stations recently, SIB1 cannot be recognized in 2022b and can be recognized in 2023b.

Is this a code change due to a change in the 3GPP specification? Or is it an improvement of matlab code?

[Song-Hyun Ji]

As you noticed, we improved quite the MATLAB code for ‘NR Cell Search and MIB and SIB1 Recovery’ when comparing the script between R2022b and R2023b. I could not find a code change for a change in the 3GPP specification in the example. If you want to get an exact answer, please contact the Technical Support team with the reproducible sample files.