diff --git a/include/osmocom/gsm/Makefile.am b/include/osmocom/gsm/Makefile.am
index aa7b1a9..ce3ac9c 100644
--- a/include/osmocom/gsm/Makefile.am
+++ b/include/osmocom/gsm/Makefile.am
@@ -1,6 +1,6 @@
 osmogsm_HEADERS = a5.h comp128.h gsm0808.h gsm48_ie.h mncc.h rxlev_stat.h \
 		  gsm0480.h gsm48.h gsm_utils.h rsl.h tlv.h abis_nm.h \
-		  sysinfo.h prim.h
+		  sysinfo.h prim.h gsm0502.h
 
 SUBDIRS = protocol
 
diff --git a/include/osmocom/gsm/gsm0502.h b/include/osmocom/gsm/gsm0502.h
new file mode 100644
index 0000000..de92c63
--- /dev/null
+++ b/include/osmocom/gsm/gsm0502.h
@@ -0,0 +1,35 @@
+#ifndef OSMOCOM_GSM_0502_H
+#define OSMOCOM_GSM_0502_H
+
+#include <stdint.h>
+
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/protocol/gsm_08_58.h>
+
+/* Table 5 Clause 7 TS 05.02 */
+static inline unsigned int
+gsm0502_get_n_pag_blocks(struct gsm48_control_channel_descr *chan_desc)
+{
+	if (chan_desc->ccch_conf == RSL_BCCH_CCCH_CONF_1_C)
+		return 3 - chan_desc->bs_ag_blks_res;
+	else
+		return 9 - chan_desc->bs_ag_blks_res;
+}
+
+/* Chapter 6.5.2 of TS 05.02 */
+static inline unsigned int
+gsm0502_get_ccch_group(uint64_t imsi, unsigned int bs_cc_chans,
+			unsigned int n_pag_blocks)
+{
+	return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks;
+}
+
+/* Chapter 6.5.2 of TS 05.02 */
+static inline unsigned int
+gsm0502_get_paging_group(uint64_t imsi, unsigned int bs_cc_chans,
+			 int n_pag_blocks)
+{
+	return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks;
+}
+
+#endif