Merge remote-tracking branch 'origin/continuous-tx' into integration_2022_wk11

executables/nr-gnb.c

@@ -209,7 +209,6 @@ void rx_func(void *param) {
   if (pthread_mutex_unlock(&rnti_to_remove_mutex)) exit(1);
 
   // RX processing
-  int tx_slot_type         = nr_slot_select(cfg,frame_tx,slot_tx);
   int rx_slot_type         = nr_slot_select(cfg,frame_rx,slot_rx);
   if (rx_slot_type == NR_UPLINK_SLOT || rx_slot_type == NR_MIXED_SLOT) {
     // UE-specific RX processing for subframe n
@@ -244,6 +243,7 @@ void rx_func(void *param) {
   pthread_mutex_unlock(&gNB->UL_INFO_mutex);
   stop_meas(&gNB->ul_indication_stats);
 
+  int tx_slot_type = nr_slot_select(cfg,frame_rx,slot_tx);
   if (tx_slot_type == NR_DOWNLINK_SLOT || tx_slot_type == NR_MIXED_SLOT) {
     notifiedFIFO_elt_t *res;
     processingData_L1tx_t *syncMsg;
@@ -255,6 +255,15 @@ void rx_func(void *param) {
     syncMsg->timestamp_tx = info->timestamp_tx;
     res->key = slot_tx;
     pushTpool(gNB->threadPool, res);
+  } else if (get_softmodem_params()->continuous_tx) {
+    notifiedFIFO_elt_t *res = pullTpool(gNB->L1_tx_free, gNB->threadPool);
+    processingData_L1tx_t *syncMsg = (processingData_L1tx_t *)NotifiedFifoData(res);
+    syncMsg->gNB = gNB;
+    syncMsg->timestamp_tx = info->timestamp_tx;
+    syncMsg->frame = frame_tx;
+    syncMsg->slot = slot_tx;
+    res->key = slot_tx;
+    pushNotifiedFIFO(gNB->L1_tx_out, res);
   }
 
 #if 0
@@ -394,6 +403,10 @@ void *tx_reorder_thread(void* param) {
     syncMsgRU.slot_tx = syncMsgL1->slot;
     syncMsgRU.timestamp_tx = syncMsgL1->timestamp_tx;
     syncMsgRU.ru = gNB->RU_list[0];
+    if (get_softmodem_params()->continuous_tx) {
+      int slots_per_frame = gNB->frame_parms.slots_per_frame;
+      next_tx_slot = (syncMsgRU.slot_tx + 1) % slots_per_frame;
+    } else
       next_tx_slot = get_next_downlink_slot(gNB, &gNB->gNB_config, syncMsgRU.frame_tx, syncMsgRU.slot_tx);
     pushNotifiedFIFO(gNB->L1_tx_free, resL1);
     if (resL1==resL1Reserve)

executables/nr-ru.c

@@ -703,21 +703,17 @@ void tx_rf(RU_t *ru,int frame,int slot, uint64_t timestamp) {
   nfapi_nr_config_request_scf_t *cfg = &ru->config;
   void *txp[ru->nb_tx];
   unsigned int txs;
-  int i,txsymb=fp->symbols_per_slot;
+  int i;
   T(T_ENB_PHY_OUTPUT_SIGNAL, T_INT(0), T_INT(0), T_INT(frame), T_INT(slot),
     T_INT(0), T_BUFFER(&ru->common.txdata[0][fp->get_samples_slot_timestamp(slot,fp,0)], fp->samples_per_subframe * 4));
-  int slot_type         = nr_slot_select(cfg,frame,slot%fp->slots_per_frame);
-  int prevslot_type     = nr_slot_select(cfg,frame,(slot+(fp->slots_per_frame-1))%fp->slots_per_frame);
-  int nextslot_type     = nr_slot_select(cfg,frame,(slot+1)%fp->slots_per_frame);
   int sf_extension = 0;
   int siglen=fp->get_samples_per_slot(slot,fp);
-  int flags=1;
+  int flags = 0;
 
-  //nr_subframe_t SF_type     = nr_slot_select(cfg,slot%fp->slots_per_frame);
-  if (slot_type == NR_DOWNLINK_SLOT || slot_type == NR_MIXED_SLOT || IS_SOFTMODEM_RFSIM) {
-    if (cfg->cell_config.frame_duplex_type.value == TDD) {
+  if (cfg->cell_config.frame_duplex_type.value == TDD && !get_softmodem_params()->continuous_tx) {
+    int slot_type = nr_slot_select(cfg,frame,slot%fp->slots_per_frame);
     if(slot_type == NR_MIXED_SLOT) {
-        txsymb = 0;
+      int txsymb = 0;
 
       for(int symbol_count = 0; symbol_count<NR_NUMBER_OF_SYMBOLS_PER_SLOT; symbol_count++) {
         if (cfg->tdd_table.max_tdd_periodicity_list[slot].max_num_of_symbol_per_slot_list[symbol_count].slot_config.value == 0)
@@ -733,16 +729,27 @@ void tx_rf(RU_t *ru,int frame,int slot, uint64_t timestamp) {
 
       //+ ru->end_of_burst_delay;
       flags = 3; // end of burst
-      }
-
-      if (slot_type == NR_DOWNLINK_SLOT && prevslot_type == NR_UPLINK_SLOT) {
+    } else if (slot_type == NR_DOWNLINK_SLOT) {
+      int prevslot_type = nr_slot_select(cfg,frame,(slot+(fp->slots_per_frame-1))%fp->slots_per_frame);
+      int nextslot_type = nr_slot_select(cfg,frame,(slot+1)%fp->slots_per_frame);
+      if (prevslot_type == NR_UPLINK_SLOT) {
         flags = 2; // start of burst
         sf_extension = ru->sf_extension;
-      }
-      if (slot_type == NR_DOWNLINK_SLOT && nextslot_type == NR_UPLINK_SLOT)
+      } else if (nextslot_type == NR_UPLINK_SLOT) {
         flags = 3; // end of burst
+      } else {
+        flags = 1; // middle of burst
+      }
+    }
+  } else { // FDD
+    if (proc->first_tx == 1) {
+      flags = 2; // start of burst
+    } else {
+      flags = 1; // middle of burst
+    }
   }
 
+  if (flags) {
     if (fp->freq_range==nr_FR2) {
       // the beam index is written in bits 8-10 of the flags
       // bit 11 enables the gpio programming

executables/nr-ue.c

@@ -1126,9 +1126,8 @@ void *UE_thread(void *arg) {
     }
 
     int flags = 0;
-    int slot_tx_usrp = slot_nr + DURATION_RX_TO_TX - NR_RX_NB_TH;
 
-    if (openair0_cfg[0].duplex_mode == duplex_mode_TDD) {
+    if (openair0_cfg[0].duplex_mode == duplex_mode_TDD && !get_softmodem_params()->continuous_tx) {
 
       uint8_t tdd_period = mac->phy_config.config_req.tdd_table.tdd_period_in_slots;
       int nrofUplinkSlots, nrofUplinkSymbols;
@@ -1140,8 +1139,9 @@ void *UE_thread(void *arg) {
         nrofUplinkSlots = mac->scc_SIB->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSlots;
         nrofUplinkSymbols = mac->scc_SIB->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols;
       }
-      uint8_t  num_UL_slots = nrofUplinkSlots + (nrofUplinkSymbols != 0);
 
+      int slot_tx_usrp = slot_nr + DURATION_RX_TO_TX - NR_RX_NB_TH;
+      uint8_t  num_UL_slots = nrofUplinkSlots + (nrofUplinkSymbols != 0);
       uint8_t first_tx_slot = tdd_period - num_UL_slots;
 
       if (slot_tx_usrp % tdd_period == first_tx_slot)

executables/softmodem-common.h

@@ -99,6 +99,7 @@ extern "C"
 #define CONFIG_HLP_USRP_THREAD   "having extra thead for usrp tx\n"
 #define CONFIG_HLP_NFAPI         "Change the nFAPI mode for NR\n"
 #define CONFIG_L1_EMULATOR       "Run in L1 emulated mode (disable PHY layer)\n"
+#define CONFIG_HLP_CONTINUOUS_TX "perform continuous transmission, even in TDD mode (to work around USRP issues)\n"
 
 /*-----------------------------------------------------------------------------------------------------------------------------------------------------*/
 /*                                            command line parameters common to eNodeB and UE                                                          */
@@ -126,6 +127,7 @@ extern "C"
 #define NODE_NUMBER         softmodem_params.node_number
 #define NON_STOP            softmodem_params.non_stop
 #define EMULATE_L1          softmodem_params.emulate_l1
+#define CONTINUOUS_TX       softmodem_params.continuous_tx
 
 #define DEFAULT_RFCONFIG_FILE    "/usr/local/etc/syriq/ue.band7.tm1.PRB100.NR40.dat";
 
@@ -163,7 +165,8 @@ extern int usrp_tx_thread;
     {"do-prb-interpolation", CONFIG_HLP_PRBINTER,     PARAMFLAG_BOOL, iptr:&PRB_INTERPOLATION,            defintval:0,           TYPE_INT,    0},                     \
     {"nfapi",                CONFIG_HLP_NFAPI,        0,              u8ptr:&nfapi_mode,                  defintval:0,           TYPE_UINT8,  0},                     \
     {"non-stop",             CONFIG_HLP_NONSTOP,      PARAMFLAG_BOOL, iptr:&NON_STOP,                     defintval:0,           TYPE_INT,    0},                     \
-    {"emulate-l1",           CONFIG_L1_EMULATOR,      PARAMFLAG_BOOL, iptr:&EMULATE_L1,                   defintval:0,           TYPE_INT,    0}                      \
+    {"emulate-l1",           CONFIG_L1_EMULATOR,      PARAMFLAG_BOOL, iptr:&EMULATE_L1,                   defintval:0,           TYPE_INT,    0},                     \
+    {"continuous-tx",        CONFIG_HLP_CONTINUOUS_TX,PARAMFLAG_BOOL, iptr:&CONTINUOUS_TX,                defintval:0,           TYPE_INT,    0},                     \
   }
 
 #define CONFIG_HLP_NSA           "Enable NSA mode \n"
@@ -254,6 +257,7 @@ typedef struct {
   uint16_t       node_number;
   int            non_stop;
   int            emulate_l1;
+  int            continuous_tx;
 } softmodem_params_t;
 
 extern uint64_t get_softmodem_optmask(void);