SRSUE: Added RLF simulator in channel emulator and integrated it in SRSUE. Removed Zeros Command

lib/include/srslte/phy/channel/channel.h

@@ -24,6 +24,7 @@
 
 #include "delay.h"
 #include "fading.h"
+#include "rlf.h"
 #include <srslte/config.h>
 #include <srslte/srslte.h>
 #include <string>
@@ -46,6 +47,11 @@ public:
     float    delay_min_us   = 10;
     float    delay_max_us   = 100;
     uint32_t delay_period_s = 3600;
+
+    // RLF options
+    bool     rlf_enable   = false;
+    uint32_t rlf_t_on_ms  = 10000;
+    uint32_t rlf_t_off_ms = 2000;
   } args_t;
 
   channel(const args_t& channel_args, uint32_t _nof_ports);
@@ -56,6 +62,7 @@ public:
 private:
   srslte_channel_fading_t* fading[SRSLTE_MAX_PORTS];
   srslte_channel_delay_t*  delay[SRSLTE_MAX_PORTS];
+  srslte_channel_rlf_t*    rlf; // RLF has no buffers / no multiple instance is required
   cf_t*                    buffer_in     = nullptr;
   cf_t*                    buffer_out    = nullptr;
   uint32_t                 nof_ports     = 0;

lib/include/srslte/phy/channel/rlf.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2013-2019 Software Radio Systems Limited
+ *
+ * This file is part of srsLTE.
+ *
+ * srsLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * srsLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * A copy of the GNU Affero General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+#ifndef SRSLTE_RLF_H
+#define SRSLTE_RLF_H
+
+#include <srslte/config.h>
+#include <srslte/phy/common/timestamp.h>
+
+typedef struct {
+  uint32_t t_on_ms;
+  uint32_t t_off_ms;
+} srslte_channel_rlf_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+SRSLTE_API void srslte_channel_rlf_init(srslte_channel_rlf_t* q, uint32_t t_on_ms, uint32_t t_off_ms);
+
+SRSLTE_API void srslte_channel_rlf_execute(
+    srslte_channel_rlf_t* q, const cf_t* in, cf_t* out, uint32_t nsamples, const srslte_timestamp_t* ts);
+
+SRSLTE_API void srslte_channel_rlf_free(srslte_channel_rlf_t* q);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SRSLTE_RLF_H

lib/src/phy/channel/channel.cc

@@ -62,6 +62,11 @@ channel::channel(const channel::args_t& channel_args, uint32_t _nof_ports)
     }
   }
 
+  if (channel_args.rlf_enable && ret == SRSLTE_SUCCESS) {
+    rlf = (srslte_channel_rlf_t*)calloc(sizeof(srslte_channel_rlf_t), 1);
+    srslte_channel_rlf_init(rlf, channel_args.rlf_t_on_ms, channel_args.rlf_t_off_ms);
+  }
+
   if (ret != SRSLTE_SUCCESS) {
     fprintf(stderr, "Error: Creating channel\n\n");
   }
@@ -77,6 +82,11 @@ channel::~channel()
     free(buffer_out);
   }
 
+  if (rlf) {
+    srslte_channel_rlf_free(rlf);
+    free(rlf);
+  }
+
   for (uint32_t i = 0; i < nof_ports; i++) {
     if (fading[i]) {
       srslte_channel_fading_free(fading[i]);
@@ -107,6 +117,11 @@ void channel::run(cf_t* in[SRSLTE_MAX_PORTS], cf_t* out[SRSLTE_MAX_PORTS], uint3
       memcpy(buffer_in, buffer_out, sizeof(cf_t) * len);
     }
 
+    if (rlf) {
+      srslte_channel_rlf_execute(rlf, buffer_in, buffer_out, len, &t);
+      memcpy(buffer_in, buffer_out, sizeof(cf_t) * len);
+    }
+
     // Copy output buffer
     memcpy(out[i], buffer_out, sizeof(cf_t) * len);
   }

lib/src/phy/channel/rlf.c

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2013-2019 Software Radio Systems Limited
+ *
+ * This file is part of srsLTE.
+ *
+ * srsLTE is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * srsLTE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * A copy of the GNU Affero General Public License can be found in
+ * the LICENSE file in the top-level directory of this distribution
+ * and at http://www.gnu.org/licenses/.
+ *
+ */
+
+#include <srslte/phy/channel/rlf.h>
+#include <srslte/phy/utils/vector.h>
+
+void srslte_channel_rlf_init(srslte_channel_rlf_t* q, uint32_t t_on_ms, uint32_t t_off_ms)
+{
+  q->t_on_ms  = t_on_ms;
+  q->t_off_ms = t_off_ms;
+}
+
+void srslte_channel_rlf_execute(
+    srslte_channel_rlf_t* q, const cf_t* in, cf_t* out, uint32_t nsamples, const srslte_timestamp_t* ts)
+{
+  uint32_t period_ms    = q->t_on_ms + q->t_off_ms;
+  double   full_secs_ms = (ts->full_secs * 1000) % period_ms;
+  double   frac_secs_ms = (ts->frac_secs * 1000);
+  double   time_ms      = full_secs_ms + frac_secs_ms;
+
+  if (time_ms < q->t_on_ms) {
+    srslte_vec_sc_prod_cfc(in, 1.0f, out, nsamples);
+  } else {
+    srslte_vec_sc_prod_cfc(in, 0.0f, out, nsamples);
+  }
+}
+
+void srslte_channel_rlf_free(srslte_channel_rlf_t* q)
+{
+  // Do nothing
+}

lib/src/radio/radio.cc

@@ -28,8 +28,6 @@ extern "C" {
 #include <string.h>
 #include <unistd.h>
 
-uint32_t zero_tti = 0;
-
 namespace srslte {
 
 bool radio::init(log_filter* _log_h, char* args, char* devname, uint32_t nof_channels)
@@ -149,26 +147,18 @@ bool radio::rx_now(cf_t* buffer[SRSLTE_MAX_PORTS], uint32_t nof_samples, srslte_
 {
   bool ret = true;
 
-    if (!radio_is_streaming) {
-      srslte_rf_start_rx_stream(&rf_device, false);
-      radio_is_streaming = true;
-    }
+  if (!radio_is_streaming) {
+    srslte_rf_start_rx_stream(&rf_device, false);
+    radio_is_streaming = true;
+  }
 
-    time_t* full_secs = rxd_time ? &rxd_time->full_secs : NULL;
-    double* frac_secs = rxd_time ? &rxd_time->frac_secs : NULL;
+  time_t* full_secs = rxd_time ? &rxd_time->full_secs : NULL;
+  double* frac_secs = rxd_time ? &rxd_time->frac_secs : NULL;
 
-    if (srslte_rf_recv_with_time_multi(&rf_device, (void**)buffer, nof_samples, true, full_secs, frac_secs) > 0) {
-      ret = true;
-    } else {
-      ret = false;
-    }
-
-  if (zero_tti) {
-    bzero(buffer[0], sizeof(cf_t) * nof_samples);
-    zero_tti--;
-    if (!zero_tti) {
-      printf("-- end of zeros\n");
-    }
+  if (srslte_rf_recv_with_time_multi(&rf_device, (void**)buffer, nof_samples, true, full_secs, frac_secs) > 0) {
+    ret = true;
+  } else {
+    ret = false;
   }
 
   return ret;

srsue/src/main.cc

@@ -40,7 +40,6 @@
 #include "srslte/common/metrics_hub.h"
 #include "srslte/version.h"
 
-extern uint32_t zero_tti;
 extern bool     simulate_rlf;
 
 using namespace std;
@@ -151,10 +150,13 @@ void parse_args(all_args_t* args, int argc, char* argv[])
     ("channel.dl.enable", bpo::value<bool>(&args->phy.dl_channel_args.enable)->default_value(false), "Enable/Disable internal Downlink channel emulator")
     ("channel.dl.fading.enable", bpo::value<bool>(&args->phy.dl_channel_args.fading_enable)->default_value(false), "Enable/Disable Fading model")
     ("channel.dl.fading.model", bpo::value<std::string>(&args->phy.dl_channel_args.fading_model)->default_value("none"), "Fading model + maximum doppler (E.g. none, epa5, eva70, etu300, etc)")
-    ("channel.dl.delay.enable", bpo::value<bool >(&args->phy.dl_channel_args.delay_enable)->default_value(false), "Enable/Disable Delay simulator")
-    ("channel.dl.delay.period", bpo::value<uint32_t >(&args->phy.dl_channel_args.delay_period_s)->default_value(3600), "Delay period in seconds (integer)")
-    ("channel.dl.delay.maximum_us", bpo::value<float >(&args->phy.dl_channel_args.delay_max_us)->default_value(100.0f), "Maximum delay in microseconds")
-    ("channel.dl.delay.minimum_us", bpo::value<float >(&args->phy.dl_channel_args.delay_min_us)->default_value(10.0f), "Minimum delay in microseconds")
+    ("channel.dl.delay.enable", bpo::value<bool>(&args->phy.dl_channel_args.delay_enable)->default_value(false), "Enable/Disable Delay simulator")
+    ("channel.dl.delay.period", bpo::value<uint32_t>(&args->phy.dl_channel_args.delay_period_s)->default_value(3600), "Delay period in seconds (integer)")
+    ("channel.dl.delay.maximum_us", bpo::value<float>(&args->phy.dl_channel_args.delay_max_us)->default_value(100.0f), "Maximum delay in microseconds")
+    ("channel.dl.delay.minimum_us", bpo::value<float>(&args->phy.dl_channel_args.delay_min_us)->default_value(10.0f), "Minimum delay in microseconds")
+    ("channel.dl.rlf.enable", bpo::value<bool>(&args->phy.dl_channel_args.rlf_enable)->default_value(false), "Enable/Disable Radio-Link Failure simulator")
+    ("channel.dl.rlf.t_on_ms", bpo::value<uint32_t >(&args->phy.dl_channel_args.rlf_t_on_ms)->default_value(10000), "Time for On state of the channel (ms)")
+    ("channel.dl.rlf.t_off_ms", bpo::value<uint32_t >(&args->phy.dl_channel_args.rlf_t_off_ms)->default_value(2000), "Time for Off state of the channel (ms)")
 
     /* Expert section */
     ("expert.phy.worker_cpu_mask",
@@ -480,9 +482,6 @@ void* input_loop(void* m)
       } else if (0 == key.compare("rlf")) {
         simulate_rlf = true;
         cout << "Sending Radio Link Failure" << endl;
-      } else if (0 == key.find("zeros ")) {
-        zero_tti = std::stoi(key.substr(6));
-        cout << "Receiving zeros for " << zero_tti << " ms" << endl;
       } else if (0 == key.compare("q")) {
         running = false;
       }

srsue/ue.conf.example

@@ -193,6 +193,11 @@ enable = false
 # dl.delay.period:      Delay period in seconds (integer).
 # dl.delay.maximum_us:  Maximum delay in microseconds
 # dl.delay.minumum_us:  Minimum delay in microseconds
+#
+# -- Radio-Link Failure (RLF) Emulator
+# dl.rlf.enable:        Enable/disable RLF simulator
+# dl.rlf.t_on_ms:       Time for On state of the channel (ms)
+# dl.rlf.t_off_ms:      Time for Off state of the channel (ms)
 #####################################################################
 [channel]
 #dl.enable           = false
@@ -202,6 +207,9 @@ enable = false
 #dl.delay.period     = 3600
 #dl.delay.maximum_us = 100
 #dl.delay.minimum_us = 10
+#dl.rlf.enable       = false
+#dl.rlf.t_on_ms      = 10000
+#dl.rlf.t_off_ms     = 2000
 
 #####################################################################
 # Expert configuration options