diff --git a/include/osmocom/smlc/smlc_subscr.h b/include/osmocom/smlc/smlc_subscr.h
new file mode 100644
index 0000000..fbc4103
--- /dev/null
+++ b/include/osmocom/smlc/smlc_subscr.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/use_count.h>
+#include <osmocom/gsm/gsm48.h>
+#include <osmocom/gsm/gsm0808.h>
+
+struct smlc_subscr {
+	struct llist_head entry;
+	struct osmo_use_count use_count;
+
+	struct osmo_mobile_identity imsi;
+	struct gsm0808_cell_id cell_id;
+
+	struct osmo_fsm_inst *loc_req;
+};
+
+struct smlc_subscr *smlc_subscr_find_or_create(const struct osmo_mobile_identity *imsi, const char *use_token);
+struct smlc_subscr *smlc_subscr_find(const struct osmo_mobile_identity *imsi, const char *use_token);
+
+int smlc_subscr_to_str_buf(char *buf, size_t buf_len, const struct smlc_subscr *smlc_subscr);
+char *smlc_subscr_to_str_c(void *ctx, const struct smlc_subscr *smlc_subscr);
+
+struct smlc_subscr *smlc_subscr_find_or_create(const struct osmo_mobile_identity *imsi, const char *use_token);
+
+#define smlc_subscr_get(smlc_subscr, use) \
+	OSMO_ASSERT(osmo_use_count_get_put(&(smlc_subscr)->use_count, use, 1) == 0)
+#define smlc_subscr_put(smlc_subscr, use) \
+	OSMO_ASSERT(osmo_use_count_get_put(&(smlc_subscr)->use_count, use, -1) == 0)