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authorHarald Welte <laforge@gnumonks.org>2011-06-26 14:20:04 +0200
committerHarald Welte <laforge@gnumonks.org>2011-06-26 14:20:04 +0200
commit2aee7b14ca17995fc311eb2d7d99c23f734adad6 (patch)
tree7e5ee57ca9888576856df38e99b0b8dc6ad35c4a /src/gsm/gsm48.c
parente9b744e581c13f8bfbf65f0cb78eb555ffa5e591 (diff)
add gsm48_number_of_paging_subchannels() function
(from openbsc's rsl_number_of_paging_subchannels)
Diffstat (limited to 'src/gsm/gsm48.c')
-rw-r--r--src/gsm/gsm48.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c
index d0345892..4645af4d 100644
--- a/src/gsm/gsm48.c
+++ b/src/gsm/gsm48.c
@@ -33,6 +33,7 @@
#include <osmocom/gsm/gsm48.h>
#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/protocol/gsm_08_58.h>
const struct tlv_definition gsm48_att_tlvdef = {
.def = {
@@ -413,3 +414,15 @@ int gsm48_construct_ra(uint8_t *buf, const struct gprs_ra_id *raid)
return 6;
}
+
+/* From Table 10.5.33 of GSM 04.08 */
+int gsm48_number_of_paging_subchannels(struct gsm48_control_channel_descr *chan_desc)
+{
+ if (chan_desc->ccch_conf == RSL_BCCH_CCCH_CONF_1_C) {
+ return OSMO_MAX(1, (3 - chan_desc->bs_ag_blks_res))
+ * (chan_desc->bs_pa_mfrms + 2);
+ } else {
+ return (9 - chan_desc->bs_ag_blks_res)
+ * (chan_desc->bs_pa_mfrms + 2);
+ }
+}