PBCH payload restructuring gNB

openair1/PHY/NR_TRANSPORT/nr_pbch.c

@@ -154,25 +154,26 @@ void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
                         uint8_t nushift,
                         uint16_t M,
                         uint16_t length,
-                        uint8_t encoded)
+                        uint8_t encoded,
+                        uint32_t unscrambling_mask)
 {
   uint8_t reset, offset;
   uint32_t x1, x2, s=0;
   uint32_t *pbch_e = pbch->pbch_e;
-  uint32_t unscrambling_mask = 0x100006D;
+  //uint32_t unscrambling_mask = 0x100006D;
   reset = 1;
   // x1 is set in lte_gold_generic
   x2 = Nid;
   // The Gold sequence is shifted by nushift* M, so we skip (nushift*M /32) double words
-  for (int i=0; i<(uint16_t)ceil(((float)nushift*M)/32); i++) {
+  for (int i=0; i<CEILIDIV(nushift*M,32); i++) {
     s = lte_gold_generic(&x1, &x2, reset);
     reset = 0;
   }
   // Scrambling is now done with offset (nushift*M)%32
   offset = (nushift*M)&0x1f;
-#ifdef DEBUG_PBCH_ENCODING
-  printf("Scrambling params: nushift %d M %d length %d encoded %d offset %d\n", nushift, M, length, encoded, offset);
-#endif
+//#ifdef DEBUG_PBCH_ENCODING
+  printf("Scrambling params: nushift %d M %d length %d encoded %d offset %d mask 0x%08x\n", nushift, M, length, encoded, offset, unscrambling_mask);
+//#endif
 
   for (int i=0; i<length; i++) {
     if (((i+offset)&0x1f)==0) {
@@ -180,7 +181,7 @@ void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
       reset = 0;
     }
 #ifdef DEBUG_PBCH_ENCODING
-  printf("s: %04x\t", s);
+  printf("i %d (i+offset)&0x1f %d s: %04x\n",i, (i+offset)&0x1f, s);
 #endif
     if (!encoded)
       pbch->pbch_a_prime ^= ((unscrambling_mask>>i)&1)? ((pbch->pbch_a_interleaved>>i)&1)<<i : (((pbch->pbch_a_interleaved>>i)&1) ^ ((s>>((i+offset)&0x1f))&1))<<i;      
@@ -195,15 +196,17 @@ uint8_t nr_init_pbch_interleaver(uint8_t *interleaver) {
   memset((void*)interleaver,0, NR_POLAR_PBCH_PAYLOAD_BITS);
 
   for (uint8_t i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++)
-    if (i<6) //Sfn bits:6
+    if (!i) // choice bit:1
+     *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_other++);
+    else if (i<7) //Sfn bits:6
       *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_sfn++);
-    else if (i<24) // other
+    else if (i<24) // other:17
       *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_other++);
     else if (i<28) // Sfn:4
       *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_sfn++);
-    else if (i==28) // Hrf bit
+    else if (i==28) // Hrf bit:1
       *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_hrf);
-    else // Ssb bits
+    else // Ssb bits:3
       *(interleaver+i) = *(nr_pbch_payload_interleaving_pattern+j_ssb++);
 }
 
@@ -228,51 +231,43 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
   uint8_t idx=0;
   uint16_t M;
   uint8_t nushift;
-  uint8_t *xbyte = pbch->pbch_a;
-  memset((void*) xbyte, 0, 1);
-  //uint8_t pbch_a_b[32];
+  uint32_t unscrambling_mask;
 
-  //  LOG_D(PHY, "PBCH generation started\n");
+  LOG_I(PHY, "PBCH generation started\n");
 
-  memset((void*)pbch, 0, sizeof(NR_gNB_PBCH));
   ///Payload generation
-    // Fix byte endian
-  if (!(sfn&7))
-    for (int i=0; i<(NR_PBCH_PDU_BITS>>3); i++)
-      pbch->pbch_a[(NR_POLAR_PBCH_PAYLOAD_BITS>>3)-i-1] = pbch_pdu[i];
-#ifdef DEBUG_PBCH_ENCODING
-  printf("Byte endian fix:\n");
-  for (int i=0; i<4; i++)
-    printf("pbch_a[%d]: 0x%02x\n", i, pbch->pbch_a[i]);
-#endif
+
+  memset((void*)pbch, 0, sizeof(NR_gNB_PBCH));
+  pbch->pbch_a=0;
+  for (int i=0; i<NR_PBCH_PDU_BITS; i++)
+    pbch->pbch_a |= ((pbch_pdu[2-(i>>3)]>>(7-(i&7)))&1)<<i;
+//#ifdef DEBUG_PBCH_ENCODING
+  for (int i=0; i<3; i++)
+    printf("pbch_pdu[%d]: 0x%02x\n", i, pbch_pdu[i]);
+  printf("PBCH payload = 0x%08x\n",pbch->pbch_a);
+//#endif
 
     // Extra byte generation
   for (int i=0; i<4; i++)
-    (*xbyte) ^= ((sfn>>i)&1)<<i; // 4 lsb of sfn
+    pbch->pbch_a |= ((sfn>>(3-i))&1)<<(24+i); // resp. 4th, 3rd, 2nd ans 1st lsb of sfn
 
-  (*xbyte) ^= n_hf<<4; // half frame index bit
+  pbch->pbch_a |= n_hf<<28; // half frame index bit
 
   if (Lmax == 64)
     for (int i=0; i<3; i++)
-      (*xbyte) ^= ((ssb_index>>(3+i))&1)<<(5+i); // resp. 4th, 5th and 6th bits of ssb_index
+      pbch->pbch_a |= ((ssb_index>>(5-i))&1)<<(29+i); // resp. 6th, 5th and 4th bits of ssb_index
   else
-    (*xbyte) ^= ((config->sch_config.ssb_subcarrier_offset.value>>5)&1)<<5; //MSB of k_SSB
-#ifdef DEBUG_PBCH_ENCODING
-  printf("Extra byte:\n");
-  for (int i=0; i<4; i++)
-    printf("pbch_a[%d]: 0x%02x\n", i, pbch->pbch_a[i]);
-#endif
+    pbch->pbch_a |= ((config->sch_config.ssb_subcarrier_offset.value>>4)&1)<<29; //MSB of k_SSB (bit index 4)
 
-    // Payload interleaving
-  uint32_t in=0;
-  for (int i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS>>3; i++)
-    in |= (uint32_t)(pbch->pbch_a[i]<<((3-i)<<3));
+  LOG_I(PHY,"After extra byte: pbch_a = 0x%08x\n",pbch->pbch_a);
 
+    // Payload interleaving
+  
   for (int i=0; i<NR_POLAR_PBCH_PAYLOAD_BITS; i++) {
-    pbch->pbch_a_interleaved |= ((in>>i)&1)<<(*(interleaver+i));
-#ifdef DEBUG_PBCH_ENCODING
-  printf("i %d in 0x%08x out 0x%08x ilv %d (in>>i)&1) %d\n", i, in, pbch->pbch_a_interleaved, *(interleaver+i), (in>>i)&1);
-#endif
+    pbch->pbch_a_interleaved |= ((pbch->pbch_a>>i)&1)<<(*(interleaver+i));
+//#ifdef DEBUG_PBCH_ENCODING
+  printf("i %d out 0x%08x ilv %d (in>>i)&1) %d\n", i, pbch->pbch_a_interleaved, *(interleaver+i), (pbch->pbch_a>>i)&1);
+//#endif
   }
 
 #ifdef DEBUG_PBCH_ENCODING
@@ -281,10 +276,11 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
 #endif
 
     // Scrambling
+  unscrambling_mask = (Lmax ==64)? 0x100006D:0x1000021;
   M = (Lmax == 64)? (NR_POLAR_PBCH_PAYLOAD_BITS - 6) : (NR_POLAR_PBCH_PAYLOAD_BITS - 3);
   nushift = (((sfn>>2)&1)<<1) ^ ((sfn>>1)&1);
   pbch->pbch_a_prime = 0;
-  nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_PAYLOAD_BITS, 0);
+  nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_PAYLOAD_BITS, 0, unscrambling_mask);
 #ifdef DEBUG_PBCH_ENCODING
   printf("Payload scrambling: nushift %d M %d sfn3 %d sfn2 %d\n", nushift, M, (sfn>>2)&1, (sfn>>1)&1);
   printf("pbch_a_prime: 0x%08x\n", pbch->pbch_a_prime);
@@ -302,7 +298,7 @@ int nr_generate_pbch(NR_gNB_PBCH *pbch,
   /// Scrambling
   M =  NR_POLAR_PBCH_E;
   nushift = (Lmax==4)? ssb_index&3 : ssb_index&7;
-  nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_E, 1);
+  nr_pbch_scrambling(pbch, (uint32_t)config->sch_config.physical_cell_id.value, nushift, M, NR_POLAR_PBCH_E, 1, 0);
 #ifdef DEBUG_PBCH_ENCODING
   printf("Scrambling:\n");
   for (int i=0; i<NR_POLAR_PBCH_E_DWORD; i++)

openair1/PHY/NR_TRANSPORT/nr_transport.h

@@ -75,7 +75,8 @@ void nr_pbch_scrambling(NR_gNB_PBCH *pbch,
                         uint8_t nushift,
                         uint16_t M,
                         uint16_t length,
-                        uint8_t encoded);
+                        uint8_t encoded,
+                        uint32_t unscrambling_mask);
 
 /*!
 \fn int nr_generate_pbch

openair1/PHY/TOOLS/tools_defs.h

@@ -32,6 +32,9 @@
 #include <stdint.h>
 #include "PHY/sse_intrin.h"
 
+#define CEILIDIV(a,b) ((a+b-1)/b)
+#define ROUNDIDIV(a,b) (((a<<1)+b)/(b<<1))
+
 
 struct complex {
   double x;

openair1/PHY/defs_gNB.h

@@ -41,7 +41,7 @@
 #define MAX_NUM_RU_PER_gNB MAX_NUM_RU_PER_eNB
 
 typedef struct {
-  uint8_t pbch_a[NR_POLAR_PBCH_PAYLOAD_BITS>>3];
+  uint32_t pbch_a;
   uint32_t pbch_a_interleaved;
   uint32_t pbch_a_prime;
   uint32_t pbch_e[NR_POLAR_PBCH_E_DWORD];

targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpn300.conf

@@ -259,6 +259,16 @@ RUs = (
     }
 );  
 
+THREAD_STRUCT = (
+  {
+    #three config for level of parallelism "PARALLEL_SINGLE_THREAD", "PARALLEL_RU_L1_SPLIT", or "PARALLEL_RU_L1_TRX_SPLIT"
+    parallel_config    = "PARALLEL_SINGLE_THREAD";
+    #two option for worker "WORKER_DISABLE" or "WORKER_ENABLE"
+    worker_config      = "WORKER_ENABLE";
+  }
+);
+
+
 NETWORK_CONTROLLER :
 {
     FLEXRAN_ENABLED        = "no";