Merge remote-tracking branch 'origin/ldpc-coderate-round-fix' into integration_2022_wk40

ci-scripts/datalog_rt_stats.1x1.60.yaml

@@ -13,12 +13,12 @@ Ref :
   feptx_total : 59.0
   L1 Tx processing : 210.0
   DLSCH encoding : 129.0
-  L1 Rx processing : 287.0
+  L1 Rx processing : 359.0
   PUSCH inner-receiver : 166.0
-  PUSCH decoding : 176.0
+  PUSCH decoding : 270.0
-  Schedule Response : 42.0
+  Schedule Response : 52.0
   DL & UL scheduling timing : 13.0
-  UL Indication : 55.0
+  UL Indication : 65.0
 Threshold :
   feprx : 1.25
   feptx_prec : 1.25

ci-scripts/datalog_rt_stats.default.yaml

@@ -13,12 +13,12 @@ Ref :
   feptx_total : 62.0
   L1 Tx processing : 170.0
   DLSCH encoding : 118.0
-  L1 Rx processing : 223.0
+  L1 Rx processing : 275.0
   PUSCH inner-receiver : 107.0
-  PUSCH decoding : 170.0
+  PUSCH decoding : 246.0
-  Schedule Response : 15.0
+  Schedule Response : 22.0
   DL & UL scheduling timing : 10.0
-  UL Indication : 27.0
+  UL Indication : 34.0
 Threshold :
   feprx : 1.25
   feptx_prec : 1.25

openair1/PHY/CODING/coding_defs.h

@@ -472,6 +472,13 @@ void nr_interleaving_ldpc(uint32_t E, uint8_t Qm, uint8_t *e,uint8_t *f);
 
 void nr_deinterleaving_ldpc(uint32_t E, uint8_t Qm, int16_t *e,int16_t *f);
 
+int nr_get_R_ldpc_decoder(int rvidx,
+                          int E,
+                          int BG,
+                          int Z,
+                          int *llrLen,
+                          int round);
+
 int nr_rate_matching_ldpc(uint32_t Tbslbrm,
                           uint8_t BG,
                           uint16_t Z,

openair1/PHY/CODING/nr_rate_matching.c

@@ -386,6 +386,39 @@ void nr_deinterleaving_ldpc(uint32_t E, uint8_t Qm, int16_t *e,int16_t *f)
 
 }
 
+int nr_get_R_ldpc_decoder(int rvidx,
+                          int E,
+                          int BG,
+                          int Z,
+                          int *llrLen,
+                          int round) {
+  AssertFatal(BG == 1 || BG == 2, "Unknown BG %d\n", BG);
+
+  int Ncb = (BG==1)?(66*Z):(50*Z);
+  int infoBits = (index_k0[BG-1][rvidx] * Z + E);
+
+  if (round == 0) *llrLen = infoBits;
+  if (infoBits > Ncb) infoBits = Ncb;
+  if (infoBits > *llrLen) *llrLen = infoBits;
+
+  int sysBits = (BG==1)?(22*Z):(10*Z);
+  float decoderR = (float)sysBits/(infoBits + 2*Z);
+
+  if (BG == 2)
+    if (decoderR < 0.3333)
+      return 15;
+    else if (decoderR < 0.6667)
+      return 13;
+    else
+      return 23;
+  else
+    if (decoderR < 0.6667)
+      return 13;
+    else if (decoderR < 0.8889)
+      return 23;
+    else
+      return 89;
+}
 
 int nr_rate_matching_ldpc(uint32_t Tbslbrm,
                           uint8_t BG,

openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c

@@ -234,6 +234,12 @@ void nr_processULSegment(void* arg) {
   short* ulsch_llr = rdata->ulsch_llr;
   int max_ldpc_iterations = p_decoderParms->numMaxIter;
   int8_t llrProcBuf[OAI_UL_LDPC_MAX_NUM_LLR] __attribute__ ((aligned(32)));
+  p_decoderParms->R = nr_get_R_ldpc_decoder(rv_index,
+                                            E,
+                                            p_decoderParms->BG,
+                                            p_decoderParms->Z,
+                                            &ulsch_harq->llrLen,
+                                            ulsch_harq->round);
 
   int16_t  z [68*384 + 16] __attribute__ ((aligned(16)));
   int8_t   l [68*384 + 16] __attribute__ ((aligned(16)));
@@ -465,26 +471,8 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
   int kc;
   if (p_decParams->BG == 2){
     kc = 52;
-    if (Coderate < 0.3333) {
-      p_decParams->R = 15;
-    }
-    else if (Coderate <0.6667) {
-      p_decParams->R = 13;
-    }
-    else {
-      p_decParams->R = 23;
-    }
   } else {
     kc = 68;
-    if (Coderate < 0.6667) {
-      p_decParams->R = 13;
-    }
-    else if (Coderate <0.8889) {
-      p_decParams->R = 23;
-    }
-    else {
-      p_decParams->R = 89;
-    }
   }
   
   NR_gNB_SCH_STATS_t *stats=NULL;

openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_decoding.c

@@ -251,6 +251,12 @@ void nr_processDLSegment(void* arg) {
   short* dlsch_llr = rdata->dlsch_llr;
   rdata->decodeIterations = dlsch->max_ldpc_iterations + 1;
   int8_t llrProcBuf[OAI_UL_LDPC_MAX_NUM_LLR] __attribute__ ((aligned(32)));
+  p_decoderParms->R = nr_get_R_ldpc_decoder(rdata->rv_index,
+                                            E,
+                                            p_decoderParms->BG,
+                                            p_decoderParms->Z,
+                                            &harq_process->llrLen,
+                                            harq_process->DLround);
 
   int16_t  z [68*384 + 16] __attribute__ ((aligned(16)));
   int8_t   l [68*384 + 16] __attribute__ ((aligned(16)));
@@ -476,25 +482,9 @@ uint32_t nr_dlsch_decoding(PHY_VARS_NR_UE *phy_vars_ue,
   if ((A <=292) || ((A <= NR_MAX_PDSCH_TBS) && (Coderate <= 0.6667)) || Coderate <= 0.25) {
     p_decParams->BG = 2;
     kc = 52;
-
-    if (Coderate < 0.3333) {
-      p_decParams->R = 15;
-    } else if (Coderate <0.6667) {
-      p_decParams->R = 13;
-    } else {
-      p_decParams->R = 23;
-    }
   } else {
     p_decParams->BG = 1;
     kc = 68;
-
-    if (Coderate < 0.6667) {
-      p_decParams->R = 13;
-    } else if (Coderate <0.8889) {
-      p_decParams->R = 23;
-    } else {
-      p_decParams->R = 89;
-    }
   }
 
   if (harq_process->first_rx == 1) {

openair1/PHY/NR_UE_TRANSPORT/nr_transport_ue.h

@@ -259,6 +259,9 @@ typedef struct {
   uint16_t dlDmrsScramblingId;
   /// PDU BITMAP 
   uint16_t pduBitmap;
+  /// Last index of LLR buffer that contains information.
+  /// Used for computing LDPC decoder R
+  int llrLen;
 } NR_DL_UE_HARQ_t;
 
 typedef struct {

openair1/PHY/defs_gNB.h

@@ -342,6 +342,9 @@ typedef struct {
   int16_t q_RI[MAX_RI_PAYLOAD];
   /// Temporary h sequence to flag PUSCH_x/PUSCH_y symbols which are not scrambled
   uint8_t h[MAX_NUM_CHANNEL_BITS];
+  /// Last index of LLR buffer that contains information.
+  /// Used for computing LDPC decoder R
+  int llrLen;
   //////////////////////////////////////////////////////////////
 } NR_UL_gNB_HARQ_t;