From 2aee7b14ca17995fc311eb2d7d99c23f734adad6 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 26 Jun 2011 14:20:04 +0200 Subject: [PATCH] add gsm48_number_of_paging_subchannels() function (from openbsc's rsl_number_of_paging_subchannels) --- include/osmocom/gsm/gsm48.h | 2 ++ src/gsm/gsm48.c | 13 +++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/osmocom/gsm/gsm48.h b/include/osmocom/gsm/gsm48.h index 1e9403b..16a625a 100644 --- a/include/osmocom/gsm/gsm48.h +++ b/include/osmocom/gsm/gsm48.h @@ -33,4 +33,6 @@ int gsm48_mi_to_string(char *string, const int str_len, void gsm48_parse_ra(struct gprs_ra_id *raid, const uint8_t *buf); int gsm48_construct_ra(uint8_t *buf, const struct gprs_ra_id *raid); +int gsm48_number_of_paging_subchannels(struct gsm48_control_channel_descr *chan_desc); + #endif diff --git a/src/gsm/gsm48.c b/src/gsm/gsm48.c index d034589..4645af4 100644 --- a/src/gsm/gsm48.c +++ b/src/gsm/gsm48.c @@ -33,6 +33,7 @@ #include #include +#include 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); + } +} -- 2.20.1