From 7934ec451adf67728007f13728eec396ef92c579 Mon Sep 17 00:00:00 2001
From: Khalid Ahmed <khalid.ahmed@iis.fraunhofer.de>
Date: Mon, 7 Oct 2019 18:11:06 +0200
Subject: [PATCH] In TTD mode consider ssb slot as DL slot

- added nr_is_ssb_slot function
---
 executables/nr-ru.c                          |  2 +-
 openair1/PHY/INIT/nr_parms.c                 | 26 ++++++++++++++++++++
 openair1/PHY/INIT/phy_init.h                 |  1 +
 openair1/SCHED_NR/phy_procedures_nr_common.c |  3 ++-
 4 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/executables/nr-ru.c b/executables/nr-ru.c
index 3b79ded517..4f676716fa 100644
--- a/executables/nr-ru.c
+++ b/executables/nr-ru.c
@@ -731,8 +731,8 @@ void tx_rf(RU_t *ru,int frame,int slot, uint64_t timestamp) {
   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][slot * fp->samples_per_slot], fp->samples_per_slot * 4));
-  nr_subframe_t SF_type     = nr_slot_select(cfg,slot%fp->slots_per_frame);
   int sf_extension = 0;
+  //nr_subframe_t SF_type     = nr_slot_select(cfg,slot%fp->slots_per_frame);
 
     int siglen=fp->samples_per_slot,flags=1;
     /*
diff --git a/openair1/PHY/INIT/nr_parms.c b/openair1/PHY/INIT/nr_parms.c
index 7ca794c5c2..81785872f9 100644
--- a/openair1/PHY/INIT/nr_parms.c
+++ b/openair1/PHY/INIT/nr_parms.c
@@ -79,6 +79,32 @@ int nr_get_ssb_start_symbol(NR_DL_FRAME_PARMS *fp, uint8_t i_ssb, uint8_t half_f
   return symbol;
 }
 
+int nr_is_ssb_slot(nfapi_nr_config_request_t *cfg, int slot)
+{
+
+  uint8_t n_hf;
+  int rel_slot;
+
+  n_hf = cfg->sch_config.half_frame_index.value;
+
+  // if SSB periodicity is 5ms, they are transmitted in both half frames
+  if ( cfg->sch_config.ssb_periodicity.value == 5) {
+    if (slot<10)
+      n_hf=0;
+    else
+      n_hf=1;
+  }
+
+  // to set a effective slot number between 0 to 9 in the half frame where the SSB is supposed to be
+  rel_slot = (n_hf)? (slot-10) : slot;
+
+  if(rel_slot<10 && rel_slot>=0)
+    return 1;
+  else
+    return 0;
+
+}
+
 
 int nr_init_frame_parms0(NR_DL_FRAME_PARMS *fp,
 			 int mu,
diff --git a/openair1/PHY/INIT/phy_init.h b/openair1/PHY/INIT/phy_init.h
index e136e8a770..7e0500b56c 100644
--- a/openair1/PHY/INIT/phy_init.h
+++ b/openair1/PHY/INIT/phy_init.h
@@ -378,6 +378,7 @@ void phy_config_request(PHY_Config_t *phy_config);
 int init_frame_parms(LTE_DL_FRAME_PARMS *frame_parms,uint8_t osf);
 void dump_frame_parms(LTE_DL_FRAME_PARMS *frame_parms);
 int nr_get_ssb_start_symbol(NR_DL_FRAME_PARMS *fp, uint8_t i_ssb, uint8_t half_frame_index);
+int nr_is_ssb_slot(nfapi_nr_config_request_t *cfg, int slot);
 int nr_init_frame_parms(nfapi_nr_config_request_t *config, NR_DL_FRAME_PARMS *frame_parms);
 int nr_init_frame_parms_ue(NR_DL_FRAME_PARMS *frame_parms,int mu,int Ncp,int N_RB_DL,int n_ssb_crb,int ssb_subcarrier_offset);
 int init_nr_ue_signal(PHY_VARS_NR_UE *ue,int nb_connected_eNB,uint8_t abstraction_flag);
diff --git a/openair1/SCHED_NR/phy_procedures_nr_common.c b/openair1/SCHED_NR/phy_procedures_nr_common.c
index c19866fc92..abc1c44ce5 100755
--- a/openair1/SCHED_NR/phy_procedures_nr_common.c
+++ b/openair1/SCHED_NR/phy_procedures_nr_common.c
@@ -31,11 +31,12 @@
 */
 
 #include "sched_nr.h"
+#include "PHY/INIT/phy_init.h"
 
 nr_subframe_t nr_slot_select(nfapi_nr_config_request_t *cfg,
 		                     unsigned char slot)
 {
-  if (cfg->subframe_config.duplex_mode.value == FDD || slot == NR_DOWNLINK_SLOT)
+  if (cfg->subframe_config.duplex_mode.value == FDD || slot == NR_DOWNLINK_SLOT || nr_is_ssb_slot(cfg, slot) == 1)
     return(SF_DL);
   else if (slot == NR_UPLINK_SLOT)
     return (SF_UL);