diff --git a/common/utils/T/tracer/Makefile b/common/utils/T/tracer/Makefile
index fd58005fff6bf3fb890f4ee9ac2a0809388b26cd..6546345968637809eeed85e630e393035dcf0589 100644
--- a/common/utils/T/tracer/Makefile
+++ b/common/utils/T/tracer/Makefile
@@ -5,7 +5,8 @@ CFLAGS=-Wall -g -pthread -DT_TRACER -I.
 
 LIBS=-lX11 -lm -lpng -lXft
 
-all: record replay extract_config textlog enb ue vcd macpdu2wireshark
+all: record replay extract_config textlog enb ue vcd macpdu2wireshark \
+     extract_input_subframe
 
 record: utils.o record.o database.o config.o
 	$(CC) $(CFLAGS) -o record $^ $(LIBS)
@@ -16,6 +17,10 @@ replay: utils.o replay.o
 extract_config: extract_config.o
 	$(CC) $(CFLAGS) -o extract_config $^ $(LIBS)
 
+extract_input_subframe: extract_input_subframe.o database.o event.o utils.o \
+    config.o
+	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
+
 textlog: utils.o textlog.o database.o event.o handler.o config.o \
          event_selector.o view/view.a gui/gui.a logger/logger.a \
          filter/filter.a
@@ -59,7 +64,7 @@ filter/filter.a:
 
 clean:
 	rm -f *.o core tracer_remote textlog enb ue vcd record replay
-	rm -f extract_config macpdu2wireshark
+	rm -f extract_config macpdu2wireshark extract_input_subframe
 	cd gui && make clean
 	cd view && make clean
 	cd logger && make clean
diff --git a/common/utils/T/tracer/extract_input_subframe.c b/common/utils/T/tracer/extract_input_subframe.c
new file mode 100644
index 0000000000000000000000000000000000000000..b5f74b3b27baa4a4c69f4854dfb8287a616becff
--- /dev/null
+++ b/common/utils/T/tracer/extract_input_subframe.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include "database.h"
+#include "event.h"
+#include "config.h"
+
+void usage(void)
+{
+  printf(
+"usage: [options] <file> <frame> <subframe>\n"
+"options:\n"
+"    -d <database file>        this option is mandatory\n"
+"    -v                        verbose\n"
+  );
+  exit(1);
+}
+
+int main(int n, char **v)
+{
+  char *database_filename = NULL;
+  void *database;
+  int i;
+  int input_event_id;
+  database_event_format f;
+  char *file = NULL;
+  int fd;
+  int frame = -1, subframe = -1;
+  int frame_arg, subframe_arg, buffer_arg;
+  int verbose = 0;
+
+  for (i = 1; i < n; i++) {
+    if (!strcmp(v[i], "-h") || !strcmp(v[i], "--help")) usage();
+    if (!strcmp(v[i], "-d"))
+      { if (i > n-2) usage(); database_filename = v[++i]; continue; }
+    if (!strcmp(v[i], "-v")) { verbose = 1; continue; }
+    if (file == NULL) { file = v[i]; continue; }
+    if (frame == -1) { frame = atoi(v[i]); continue; }
+    if (subframe == -1) { subframe = atoi(v[i]); continue; }
+    usage();
+  }
+  if (file == NULL || frame == -1 || subframe == -1) usage();
+
+  if (database_filename == NULL) {
+    printf("ERROR: provide a database file (-d)\n");
+    exit(1);
+  }
+
+  database = parse_database(database_filename);
+
+  load_config_file(database_filename);
+
+  input_event_id = event_id_from_name(database, "ENB_PHY_INPUT_SIGNAL");
+  f = get_format(database, input_event_id);
+
+  frame_arg = subframe_arg = buffer_arg = -1;
+  for (i = 0; i < f.count; i++) {
+    if (!strcmp(f.name[i], "frame")) {
+      if (frame_arg != -1) goto err;
+      if (strcmp(f.type[i], "int")) goto err;
+      frame_arg = i;
+    }
+    if (!strcmp(f.name[i], "subframe")) {
+      if (subframe_arg != -1) goto err;
+      if (strcmp(f.type[i], "int")) goto err;
+      subframe_arg = i;
+    }
+    if (!strcmp(f.name[i], "rxdata")) {
+      if (buffer_arg != -1) goto err;
+      if (strcmp(f.type[i], "buffer")) goto err;
+      buffer_arg = i;
+    }
+    continue;
+err:
+    printf("cannot deal with ENB_PHY_INPUT_SIGNAL from database file\n");
+    exit(1);
+  }
+  if (frame_arg == -1 || subframe_arg == -1 || buffer_arg == -1) goto err;
+
+  fd = open(file, O_RDONLY);
+  if (fd == -1) { perror(file); exit(1); }
+
+  /* get wanted frame/subframe */
+  while (1) {
+    char v[T_BUFFER_MAX];
+    event e;
+    e = get_event(fd, v, database);
+    if (e.type == -1) break;
+    if (e.type != input_event_id) continue;
+    if (verbose)
+      printf("input frame %d subframe %d size %d\n",
+             e.e[frame_arg].i, e.e[subframe_arg].i, e.e[buffer_arg].bsize);
+    if (!(frame == e.e[frame_arg].i && subframe == e.e[subframe_arg].i))
+      continue;
+#if 0
+for (i = 0; i < e.e[buffer_arg].bsize/2; i++) {
+short *x = e.e[buffer_arg].b;
+x[i] *= 14;
+}
+#endif
+    fwrite(e.e[buffer_arg].b, e.e[buffer_arg].bsize, 1, stdout);
+    fflush(stdout);
+    return 0;
+  }
+
+  printf("frame %d subframe %d not found\n", frame, subframe);
+  return 0;
+}