[srsran-users] how can complete code cell_search that beside that earfcn and frequency, print plmn code for operator cell?

[Surabhi Karandikar]

Hi, I am working on something very similar to this. It would be a great
help if you can give a direction about the decoding of various SIBs,
starting with SIB1.
I see a parameter 'required_sibs' in the UE RRC files.
Moreover, the example pdsch_ue, which does cell search, MIB decoding, PDCCH
candidate search in the common search space, and PDSCH decoding using the
SI-RNTI (SIB1).
I would like to go beyond this, can anyone please guide? I wish to search
PDCCH candidates in the UE-specific search space, and decode SIBs.



On Tue, Aug 29, 2023 at 5:35 AM Johann T. <johann.tzt at gmail.com> wrote:

> Hi,
>
> In the cell_search, only the MIB is decoded. While the PLMN ID is
> contained in SIB1. Thus you need to decode SIB1 as well.
>
> Cheers,
> Johann
>
>
>
> On Tue, Aug 29, 2023 at 12:35 PM sp <stackprogramer at gmail.com> wrote:
>
>> there is an example in path /lib/example/cell_search.c, it can search for
>> all earfcn and frequencies in a band..... my question is how can edit and
>> modify it
>> Furthermore, earfcn, it prints plmn code for the operator,  can anyone
>> guide me? Thanks in advance
>> A part of code you see that, you can see complete code from this link
>> <https://github.com/srsran/srsRAN_4G/blob/master/lib/examples/cell_search.c>
>> .
>>
>> for (freq = 0; freq < nof_freqs && !go_exit; freq++) {
>>     /* set rf_freq */
>>     srsran_rf_set_rx_freq(&rf, 0, (double)channels[freq].fd * MHZ);
>>     INFO("Set rf_freq to %.3f MHz", (double)channels[freq].fd * MHZ /
>> 1000000);
>>
>>     printf(
>>         "[%3d/%d]: EARFCN %d Freq. %.2f MHz looking for PSS.\n", freq,
>> nof_freqs, channels[freq].id, channels[freq].fd);
>>     fflush(stdout);
>>
>>     if (SRSRAN_VERBOSE_ISINFO()) {
>>       printf("\n");
>>     }
>>
>>     bzero(found_cells, 3 * sizeof(srsran_ue_cellsearch_result_t));
>>
>>     INFO("Setting sampling frequency %.2f MHz for PSS search",
>> SRSRAN_CS_SAMP_FREQ / 1000000);
>>     srsran_rf_set_rx_srate(&rf, SRSRAN_CS_SAMP_FREQ);
>>     INFO("Starting receiver...");
>>     srsran_rf_start_rx_stream(&rf, false);
>>
>>     n = srsran_ue_cellsearch_scan(&cs, found_cells, NULL);
>>     if (n < 0) {
>>       ERROR("Error searching cell");
>>       exit(-1);
>>     } else if (n > 0) {
>>       for (int i = 0; i < 3; i++) {
>>         if (found_cells[i].psr > 2.0) {
>>           srsran_cell_t cell;
>>           cell.id = found_cells[i].cell_id;
>>           cell.cp = found_cells[i].cp;
>>           int ret = rf_mib_decoder(&rf, 1, &cell_detect_config, &cell,
>> NULL);
>>           if (ret < 0) {
>>             ERROR("Error decoding MIB");
>>             exit(-1);
>>           }
>>           if (ret == SRSRAN_UE_MIB_FOUND) {
>>             printf("Found CELL ID %d. %d PRB, %d ports\n", cell.id,
>> cell.nof_prb, cell.nof_ports);
>>             if (cell.nof_ports > 0) {
>>               results[n_found_cells].cell      = cell;
>>               results[n_found_cells].freq      = channels[freq].fd;
>>               results[n_found_cells].dl_earfcn = channels[freq].id;
>>               results[n_found_cells].power     = found_cells[i].peak;
>>               n_found_cells++;
>>             }
>>           }
>>         }
>>       }
>>     }
>>   }
>>
>>
>>
>>
>>
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