command line option added to activate/deactivate timing offset simulation on RFSimulator

executables/nr-softmodem-common.h

@@ -116,6 +116,7 @@
 #define CONFIG_HLP_GNBK2         "Set the additional k2 for NTN at gNB\n"
 #define CONFIG_HLP_ULSCHEDF      "Set the maximum number of buffered UL scheduled frames at gNB\n"
 #define CONFIG_HLP_FDoppler      "Set the maximum Doppler frequency shift\n"
+#define CONFIG_HLP_TShift        "Set the maximum Doppler frequency shift\n"
 #define CONFIG_HLP_FDopplerComp  "Execute continous frequency offset compensation\n"
 #define CONFIG_HLP_TDRIFT        "Set the timing offset/drift per frame in the RF simulator (expressed in number of samples per frame)\n"
 #define CONFIG_HLP_PathStart     "Set the time [sec] at which satellite is becoming visible to the UE"
@@ -185,6 +186,7 @@ extern uint16_t NTN_UE_k2; //the additional k2 value at UE
 extern uint16_t NTN_gNB_k2; //the additional k2 value at gNB
 extern uint16_t max_ul_sched_frame; //Set the maximum number of buffered UL scheduled frames at gNB, for UL_tti_req_ahead and vrb_map_UL
 extern int fdoppler;             // flag to simulate frequency offset at the RF-Simulator (default active = 1, 0 = de-activate)
+extern int tshift;             // flag to simulate timing offset at the RF-Simulator (default active = 1, 0 = de-activate)
 extern int fdopplerComp;         // flag to activate/deactivate continous frequency offset compensation
 extern int RFsim_DriftPerFrame; //the timing offset/drift per frame in the RF simulator (expressed in number of samples per frame)
 extern uint16_t pathStartingTime;    // time [sec] at which satellite is becoming visible to the UE.

executables/nr-softmodem.c

@@ -572,6 +572,7 @@ uint64_t RFsim_PropDelay = 0;
 uint16_t NTN_gNB_k2 = 0;
 uint16_t max_ul_sched_frame = 1;
 int fdoppler = 1;               // flag to simulate frequency offset at the RF-Simulator (default active = 1, 0 = de-activate)
+int tshift = 0;               // flag to simulate timing offset at the RF-Simulator (default de-activate = 0, 0 = activate)
 int fdopplerComp = 1;
 int RFsim_DriftPerFrame = 0;
 uint16_t pathStartingTime = 1050;

executables/nr-softmodem.h

@@ -36,6 +36,7 @@
   {"gnb_k2" ,               CONFIG_HLP_GNBK2,          0,                .u16ptr=&NTN_gNB_k2,                 .defintval=0,                     TYPE_UINT16, 0},        \
   {"ul_sched_f" ,           CONFIG_HLP_ULSCHEDF,       0,                .u16ptr=&max_ul_sched_frame,         .defintval=1,                     TYPE_UINT16, 0},        \
   {"FD" ,                   CONFIG_HLP_FDoppler,       0,                .iptr=&fdoppler,                     .defintval=1,                     TYPE_INT,    0},        \
+  {"TS" ,                   CONFIG_HLP_TShift,         0,                .iptr=&tshift,                       .defintval=0,                     TYPE_INT,    0},        \
   {"TD" ,                   CONFIG_HLP_TDRIFT,         0,                .iptr=&RFsim_DriftPerFrame,          .defintval=0,                     TYPE_INT,    0},        \
   {"PST" ,                  CONFIG_HLP_PathStart,      0,                .u16ptr=&pathStartingTime,           .defintval=1050,                  TYPE_UINT16, 0},        \
   {"PET" ,                  CONFIG_HLP_PathEnd,        0,                .u16ptr=&pathEndingTime,             .defintval=1280,                  TYPE_UINT16, 0},        \

executables/nr-uesoftmodem.c

@@ -429,6 +429,7 @@ uint16_t NTN_UE_k2 = 0;
 uint16_t NTN_UE_slot_Rx_to_Tx = 0;
 int RFsim_DriftPerFrame = 0;
 int32_t fdoppler = 1;              // flag to simulate frequency offset at the RF-Simulator (default active = 1, 0 = de-activate)
+int32_t tshift = 0;              // flag to simulate timing offset at the RF-Simulator (default de-activate = 0, 1 = activate)
 uint16_t pathStartingTime = 1050;
 uint16_t pathEndingTime = 1280;
 int uePosY = 0;

executables/nr-uesoftmodem.h

@@ -67,6 +67,7 @@
   {"ue_slot_Rx_Tx" ,               CONFIG_HLP_UESLOTRXTX,      0,               .u16ptr=&NTN_UE_slot_Rx_to_Tx,               .defintval=0,      TYPE_UINT16,   0}, \
   {"ue_k2" ,                       CONFIG_HLP_UEK2,            0,               .u16ptr=&NTN_UE_k2,                          .defintval=0,      TYPE_UINT16,   0}, \
   {"FD" ,                          CONFIG_HLP_FDoppler,        0,               .iptr=&fdoppler,                             .defintval=1,      TYPE_INT,      0}, \
+  {"TS" ,                          CONFIG_HLP_TShift,          0,               .iptr=&tshift,                               .defintval=0,      TYPE_INT,      0}, \
   {"FC" ,                          CONFIG_HLP_FDopplerComp,    0,               .iptr=&fdopplerComp,                         .defintval=1,      TYPE_INT,      0}, \
   {"TD" ,                          CONFIG_HLP_TDRIFT,          0,               .iptr=&RFsim_DriftPerFrame,                  .defintval=0,      TYPE_INT,      0}, \
   {"PST" ,                         CONFIG_HLP_PathStart,       0,               .u16ptr=&pathStartingTime,                   .defintval=1050,   TYPE_UINT16,   0}, \

radio/rfsimulator/simulator.c

@@ -836,6 +836,7 @@ static bool flushInput(rfsimulator_state_t *t, int timeout, int nsamps_for_initi
 
 //Paramters for Doppler shift. Assume the Doppler frequency changes every frame
 extern int32_t fdoppler; // flag to simulate frequency offset (default active = 1, 0 = de-activate)
+extern int tshift;
 const uint32_t fsamp = 61440000; //sampling frequency
 extern uint16_t pathStartingTime;    // time [sec] at which satellite is becoming visible to the UE 
 extern uint16_t pathEndingTime;      // time [sec] at which satellite is no more visible to the UE
@@ -972,7 +973,8 @@ static int rfsimulator_read(openair0_device *device, openair0_timestamp *ptimest
             currDoppler =  (currDopplerTmp - initDoppler) ;
           }
 
-          RFsim_PropDelay = (2 * norm_d / c) * fsamp; 
+          if(tshift)
+            RFsim_PropDelay = (2 * norm_d / c) * fsamp; 
           //printf("**** counter: %lu, RFsim_PropDelay[Samp]: %lu , Doppler: %d, freqScale: %f ***** \n ", counter, RFsim_PropDelay, currDoppler, freqScale);        
 
           //LOG_I(HW, "nbAnt_tx %d\n",nbAnt_tx);