diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index e237ea2..89db48b 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -436,4 +436,9 @@
 int bsc_base_ctrl_cmds_install(void);
 int msc_ctrl_cmds_install(void);
 
+/* dependency handling */
+void bts_depend_mark(struct gsm_bts *bts, int dep);
+void bts_depend_clear(struct gsm_bts *bts, int dep);
+int bts_depend_check(struct gsm_bts *bts);
+
 #endif /* _GSM_DATA_H */
diff --git a/openbsc/include/openbsc/gsm_data_shared.h b/openbsc/include/openbsc/gsm_data_shared.h
index 001a526..5d84969 100644
--- a/openbsc/include/openbsc/gsm_data_shared.h
+++ b/openbsc/include/openbsc/gsm_data_shared.h
@@ -720,6 +720,9 @@
 
 	/* supported codecs beside FR */
 	struct bts_codec_conf codec;
+
+	/* BTS dependencies bit field */
+	uint32_t depends_on[256/(8*4)];
 #endif /* ROLE_BSC */
 	void *role;
 };
diff --git a/openbsc/src/libbsc/bsc_vty.c b/openbsc/src/libbsc/bsc_vty.c
index 08f9a8e..d6d66c6 100644
--- a/openbsc/src/libbsc/bsc_vty.c
+++ b/openbsc/src/libbsc/bsc_vty.c
@@ -650,6 +650,23 @@
 	vty_out(vty, "  %sforce-combined-si%s",
 		bts->force_combined_si ? "" : "no ", VTY_NEWLINE);
 
+	for (i = 0; i < ARRAY_SIZE(bts->depends_on); ++i) {
+		int j;
+
+		if (bts->depends_on[i] == 0)
+			continue;
+
+		for (j = 0; j < sizeof(bts->depends_on[i]) * 8; ++j) {
+			int bts_nr;
+
+			if ((bts->depends_on[i] & (1<<j)) == 0)
+				continue;
+
+			bts_nr = (i * sizeof(bts->depends_on[i]) * 8) + j;
+			vty_out(vty, "  depends-on-bts %d%s", bts_nr, VTY_NEWLINE);
+		}
+	}
+
 	config_write_bts_model(vty, bts);
 }
 
@@ -2772,6 +2789,50 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_bts_depends_on, cfg_bts_depends_on_cmd,
+	"depends-on-bts <0-255>",
+	"This BTS can only be started if another one is up\n" "BTS Number\n")
+{
+	struct gsm_bts *bts = vty->index;
+	struct gsm_bts *other_bts;
+	int dep = atoi(argv[0]);
+
+
+	if (!is_ipaccess_bts(bts)) {
+		vty_out(vty, "This feature is only available for IP systems.%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	other_bts = gsm_bts_num(bts->network, dep);
+	if (!other_bts || !is_ipaccess_bts(other_bts)) {
+		vty_out(vty, "This feature is only available for IP systems.%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	if (dep >= bts->nr) {
+		vty_out(vty, "%%Need to depend on an already declared unit.%s",
+			VTY_NEWLINE);
+		return CMD_WARNING;
+	}
+
+	bts_depend_mark(bts, dep);
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_bts_no_depends_on, cfg_bts_no_depends_on_cmd,
+	"depeneds-on-bts <0-255>",
+	NO_STR "This BTS can only be started if another one is up\n"
+	"BTS Number\n")
+{
+	struct gsm_bts *bts = vty->index;
+	int dep = atoi(argv[0]);
+
+	bts_depend_clear(bts, dep);
+	return CMD_SUCCESS;
+}
+
 #define TRX_TEXT "Radio Transceiver\n"
 
 /* per TRX configuration */
@@ -3383,6 +3444,8 @@
 	install_element(BTS_NODE, &cfg_bts_codec2_cmd);
 	install_element(BTS_NODE, &cfg_bts_codec3_cmd);
 	install_element(BTS_NODE, &cfg_bts_codec4_cmd);
+	install_element(BTS_NODE, &cfg_bts_depends_on_cmd);
+	install_element(BTS_NODE, &cfg_bts_no_depends_on_cmd);
 
 	install_element(BTS_NODE, &cfg_trx_cmd);
 	install_node(&trx_node, dummy_config_write);
diff --git a/openbsc/src/libbsc/bts_ipaccess_nanobts.c b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
index 9fa03bf..825a22e 100644
--- a/openbsc/src/libbsc/bts_ipaccess_nanobts.c
+++ b/openbsc/src/libbsc/bts_ipaccess_nanobts.c
@@ -590,6 +590,13 @@
 		/* remove old OML signal link for this BTS. */
 		ipaccess_drop_oml(bts);
 
+		if (!bts_depend_check(bts)) {
+			LOGP(DLINP, LOGL_NOTICE,
+				"Dependency not full-filled for %u/%u/%u\n",
+				dev->site_id, dev->bts_id, dev->trx_id);
+			return NULL;
+		}
+
 		/* create new OML link. */
 		sign_link = bts->oml_link =
 			e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML - 1],
diff --git a/openbsc/src/libcommon/gsm_data.c b/openbsc/src/libcommon/gsm_data.c
index 03e9b85..73041fc 100644
--- a/openbsc/src/libcommon/gsm_data.c
+++ b/openbsc/src/libcommon/gsm_data.c
@@ -364,3 +364,61 @@
 	return ret;
 }
 
+/* Assume there are only 256 possible bts */
+osmo_static_assert(sizeof(((struct gsm_bts *) 0)->nr) == 1, _bts_nr_is_256);
+static void depends_calc_index_bit(int bts_nr, int *idx, int *bit)
+{
+	*idx = bts_nr / (8 * 4);
+	*bit = bts_nr % (8 * 4);
+}
+
+void bts_depend_mark(struct gsm_bts *bts, int dep)
+{
+	int idx, bit;
+	depends_calc_index_bit(dep, &idx, &bit);
+
+	bts->depends_on[idx] |= 1 << bit;
+}
+
+void bts_depend_clear(struct gsm_bts *bts, int dep)
+{
+	int idx, bit;
+	depends_calc_index_bit(dep, &idx, &bit);
+
+	bts->depends_on[idx] &= ~(1 << bit);
+}
+
+static int bts_depend_is_depedency(struct gsm_bts *base, struct gsm_bts *other)
+{
+	int idx, bit;
+	depends_calc_index_bit(other->nr, &idx, &bit);
+
+	/* Check if there is a depends bit */
+	return (base->depends_on[idx] & (1 << bit)) > 0;
+}
+
+static int bts_is_online(struct gsm_bts *bts)
+{
+	/* TODO: support E1 BTS too */
+	if (!is_ipaccess_bts(bts))
+		return 1;
+
+	if (!bts->oml_link)
+		return 0;
+
+	return bts->mo.nm_state.operational == NM_OPSTATE_ENABLED;
+}
+
+int bts_depend_check(struct gsm_bts *bts)
+{
+	struct gsm_bts *other_bts;
+
+	llist_for_each_entry(other_bts, &bts->network->bts_list, list) {
+		if (!bts_depend_is_depedency(bts, other_bts))
+			continue;
+		if (bts_is_online(other_bts))
+			continue;
+		return 0;
+	}
+	return 1;
+}