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

[Johann T.]

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++;
>             }
>           }
>         }
>       }
>     }
>   }
>
>
>
>
>
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20230829/afd6664d/attachment.htm>