issue 137 - correct computation of G

G was wrongly computed in some places, not taking into account
CQI and RI bits. This commit saves the correct value computed
in ulsch_decoding so we can reuse it in ulsch_decoding_data
(and the like).

Only the file openair1/PHY/LTE_TRANSPORT/ulsch_decoding.c has
been checked. If the computation is done somewhere else the
problem might still exist.

openair1/PHY/LTE_TRANSPORT/defs.h

@@ -374,6 +374,8 @@ typedef struct {
   uint32_t TBS;
   /// The payload + CRC size in bits
   uint32_t B;
+  /// Number of soft channel bits
+  uint32_t G;
   /// CQI CRC status
   uint8_t cqi_crc_status;
   /// Pointer to CQI data

openair1/PHY/LTE_TRANSPORT/ulsch_decoding.c

@@ -236,7 +236,7 @@ int ulsch_decoding_data_2thread0(td_params* tdp) {
   LTE_eNB_ULSCH_t *ulsch = eNB->ulsch[UE_id];
   LTE_UL_eNB_HARQ_t *ulsch_harq = ulsch->harq_processes[harq_pid];
   int Q_m = get_Qm_ul(ulsch_harq->mcs);
-  int G = ulsch_harq->nb_rb * (12 * Q_m) * ulsch_harq->Nsymb_pusch;
+  int G = ulsch_harq->G;
   uint32_t E;
   uint32_t Gp,GpmodC,Nl=1;
   uint32_t C = ulsch_harq->C;
@@ -458,7 +458,7 @@ int ulsch_decoding_data_2thread(PHY_VARS_eNB *eNB,int UE_id,int harq_pid,int llr
   LTE_eNB_ULSCH_t *ulsch = eNB->ulsch[UE_id];
   LTE_UL_eNB_HARQ_t *ulsch_harq = ulsch->harq_processes[harq_pid];
   int Q_m = get_Qm_ul(ulsch_harq->mcs);
-  int G = ulsch_harq->nb_rb * (12 * Q_m) * ulsch_harq->Nsymb_pusch;
+  int G = ulsch_harq->G;
   unsigned int E;
   int Cby2;
 
@@ -666,7 +666,7 @@ int ulsch_decoding_data(PHY_VARS_eNB *eNB,int UE_id,int harq_pid,int llr8_flag)
   LTE_eNB_ULSCH_t *ulsch = eNB->ulsch[UE_id];
   LTE_UL_eNB_HARQ_t *ulsch_harq = ulsch->harq_processes[harq_pid];
   int Q_m = get_Qm_ul(ulsch_harq->mcs);
-  int G = ulsch_harq->nb_rb * (12 * Q_m) * ulsch_harq->Nsymb_pusch;
+  int G = ulsch_harq->G;
   unsigned int E;
 
   uint8_t (*tc)(int16_t *y,
@@ -1044,6 +1044,7 @@ unsigned int  ulsch_decoding(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,
 #endif
 
   G = G - Q_RI - Q_CQI;
+  ulsch_harq->G = G;
 
   if ((int)G < 0) {
     LOG_E(PHY,"FATAL: ulsch_decoding.c G < 0 (%d) : Q_RI %d, Q_CQI %d\n",G,Q_RI,Q_CQI);