diff --git a/src/bts.h b/src/bts.h
index f6cc88f..093a8e3 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -71,6 +71,10 @@
 	void detach_tbf(gprs_rlcmac_tbf *tbf);
 
 	unsigned num_tbfs(enum gprs_rlcmac_tbf_direction dir) const;
+
+	void reserve(enum gprs_rlcmac_tbf_direction dir);
+	void unreserve(enum gprs_rlcmac_tbf_direction dir);
+	unsigned num_reserved(enum gprs_rlcmac_tbf_direction dir) const;
 #endif
 
 	uint8_t m_is_enabled; /* TS is enabled */
@@ -100,6 +104,7 @@
 #endif
 
 	uint8_t m_num_tbfs[2];
+	uint8_t m_num_reserved[2];
 };
 
 struct gprs_rlcmac_trx {
@@ -112,6 +117,11 @@
 	/* back pointers */
 	struct BTS *bts;
 	uint8_t trx_no;
+
+#ifdef __cplusplus
+	void reserve_slots(enum gprs_rlcmac_tbf_direction dir, uint8_t slots);
+	void unreserve_slots(enum gprs_rlcmac_tbf_direction dir, uint8_t slots);
+#endif
 };
 
 /**
@@ -311,6 +321,12 @@
 	return m_num_tbfs[dir];
 }
 
+inline unsigned gprs_rlcmac_pdch::num_reserved(
+	enum gprs_rlcmac_tbf_direction dir) const
+{
+	return gprs_rlcmac_pdch::m_num_reserved[dir];
+}
+
 inline struct rate_ctr_group *BTS::rate_counters() const
 {
 	return m_ratectrs;