:::warning
# <center><i class="fa fa-edit"></i>read mac</center>
:::

[TOC]

Here we see the main function of read_mac_sm

void read_mac_sm(mac_ind_msg_t* data)
{
  assert(data != NULL);

  data->tstamp = time_now_us();

//  assert(0!=0 && "Read MAC called");

  const NR_UE_info_t* UE_info = &RC.nrmac[mod_id]->UE_info;
  const size_t num_ues = UE_info->num_UEs;

  data->len_ue_stats = num_ues;
  if(data->len_ue_stats > 0){
    data->ue_stats = calloc(data->len_ue_stats, sizeof(mac_ue_stats_impl_t));
    assert( data->ue_stats != NULL && "Memory exhausted" );
  }

  const NR_list_t* ue_list = &UE_info->list;
  size_t i = 0;
  for (int ue_id = ue_list->head; ue_id >= 0; ue_id = ue_list->next[ue_id]) {
    const NR_UE_sched_ctrl_t* sched_ctrl = &UE_info->UE_sched_ctrl[ue_id];
    const NR_mac_stats_t* uestats = &UE_info->mac_stats[ue_id];
    mac_ue_stats_impl_t* rd = &data->ue_stats[i];

    rd->dl_aggr_tbs = uestats->dlsch_total_bytes;
    rd->ul_aggr_tbs = uestats->ulsch_total_bytes_rx;


    rd->rnti = UE_info->rnti[ue_id];
    rd->dl_aggr_prb = uestats->dlsch_total_rbs; 
    rd->ul_aggr_prb = uestats->ulsch_total_rbs;
    rd->dl_aggr_retx_prb = uestats->dlsch_total_rbs_retx ;

    rd->dl_aggr_bytes_sdus = uestats->lc_bytes_tx[3] ;
    rd->ul_aggr_bytes_sdus = uestats->lc_bytes_rx[3];

    rd->dl_aggr_sdus = uestats->dlsch_num_mac_sdu;
    rd->ul_aggr_sdus = uestats->ulsch_num_mac_sdu;

    rd->pusch_snr = (float) sched_ctrl->pusch_snrx10 / 10; //: float = -64;
    rd->pucch_snr = (float) sched_ctrl->pucch_snrx10 / 10 ; //: float = -64;

    // no CQI measurements implemented in OAI 5G yet
    rd->wb_cqi = 0; 
    rd->dl_mcs1 = sched_ctrl->sched_pdsch.mcs;
    rd->ul_mcs1 = sched_ctrl->sched_pusch.mcs ;
    rd->dl_mcs2 = 0; 
    rd->ul_mcs2 = 0; 
    rd->phr = sched_ctrl->ph; 

    ++i;
  }
}

- [***mac_ind_msg_t***](https://hackmd.io/ua7CZJVkStyQ49Tv4l4CQw) - MAC indication message

- [***time_now_us***](https://hackmd.io/g68PY1naRlG0TTqOEsh_dQ) - giving us a realtime in secods, and microseconds

- [***NR_UE_info_t***](https://hackmd.io/sJ-ASeK6Q9KcG3pQgrYtzg) - UE list used by gNB to order UEs/CC for scheduling

- [***NR_list_t***](https://hackmd.io/2624JYfuRhSmZgkESFRQJg) - NR_list_t is a "list" (of users, HARQ processes, slices). Especially useful in the scheduler and to keep "classes" of users.

- [***NR_UE_sched_ctrl_t***](https://hackmd.io/IQ6mEo5mRLSbWcOxw-INaQ) - sheduling control information set through an API

- [***NR_mac_stats_t***](https://hackmd.io/IwNA-XOsTrmzzsIzrcbf8w) - sheduling control info

- [***mac_ue_stats_impl_t***](https://hackmd.io/_8_0eYBOTJmER3B83OLNDw) - implement MAC UE stats