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authorHolger Hans Peter Freyther <holger@moiji-mobile.com>2016-05-17 23:20:03 +0200
committerHolger Freyther <holger@freyther.de>2016-05-30 21:28:40 +0000
commit82dd983dd85c04b5aa013365334f2a249140902e (patch)
tree8d60edd8118dce1cbb12047058b3f7a3a91749db
parent307e40648e359015be0ce663c8a7c5356ed191f4 (diff)
bsc: Create minimal SI6 rest octets
In GSM R99 SI6 has mandatory SI6 rest octets and so far we did not include them. Add minimal support to generate the right band indicator. Target a slightly older version of the SI6 rest octets as we neither support MBMS nor Random bit stream but should include the band indicator. Change-Id: I417a40eb91f42a3416b4e07bb9fb4d7a01aaa36b Fixes: OS#1698 Related: OS#1725 Reviewed-on: https://gerrit.osmocom.org/71 Tested-by: Jenkins Builder Reviewed-by: Max <msuraev@sysmocom.de> Reviewed-by: Holger Freyther <holger@freyther.de>
-rw-r--r--openbsc/include/openbsc/rest_octets.h1
-rw-r--r--openbsc/src/libbsc/rest_octets.c39
-rw-r--r--openbsc/src/libbsc/system_information.c4
3 files changed, 43 insertions, 1 deletions
diff --git a/openbsc/include/openbsc/rest_octets.h b/openbsc/include/openbsc/rest_octets.h
index 32b9963..91413b5 100644
--- a/openbsc/include/openbsc/rest_octets.h
+++ b/openbsc/include/openbsc/rest_octets.h
@@ -12,6 +12,7 @@
int rest_octets_si1(uint8_t *data, uint8_t *nch_pos, int is1800_net);
int rest_octets_si2quater(uint8_t *data, const struct osmo_earfcn_si2q *e,
const uint16_t *u, const uint16_t *sc, size_t u_len);
+int rest_octets_si6(uint8_t *data, bool is1800_net);
struct gsm48_si_selection_params {
uint16_t penalty_time:5,
diff --git a/openbsc/src/libbsc/rest_octets.c b/openbsc/src/libbsc/rest_octets.c
index aa286e5..065fb7b 100644
--- a/openbsc/src/libbsc/rest_octets.c
+++ b/openbsc/src/libbsc/rest_octets.c
@@ -450,6 +450,45 @@ int rest_octets_si4(uint8_t *data, const struct gsm48_si_ro_info *si4, int len)
return bv.data_len;
}
+
+/* GSM 04.18 ETSI TS 101 503 V8.27.0 (2006-05)
+
+<SI6 rest octets> ::=
+{L | H <PCH and NCH info>}
+{L | H <VBS/VGCS options : bit(2)>}
+{ < DTM_support : bit == L > I < DTM_support : bit == H >
+< RAC : bit (8) >
+< MAX_LAPDm : bit (3) > }
+< Band indicator >
+{ L | H < GPRS_MS_TXPWR_MAX_CCH : bit (5) > }
+<implicit spare >;
+*/
+int rest_octets_si6(uint8_t *data, bool is1800_net)
+{
+ struct bitvec bv;
+
+ memset(&bv, 0, sizeof(bv));
+ bv.data = data;
+ bv.data_len = 1;
+
+ /* no PCH/NCH info */
+ bitvec_set_bit(&bv, L);
+ /* no VBS/VGCS options */
+ bitvec_set_bit(&bv, L);
+ /* no DTM_support */
+ bitvec_set_bit(&bv, L);
+ /* band indicator */
+ if (is1800_net)
+ bitvec_set_bit(&bv, L);
+ else
+ bitvec_set_bit(&bv, H);
+ /* no GPRS_MS_TXPWR_MAX_CCH */
+ bitvec_set_bit(&bv, L);
+
+ bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
+ return bv.data_len;
+}
+
/* GPRS Mobile Allocation as per TS 04.60 Chapter 12.10a:
< GPRS Mobile Allocation IE > ::=
< HSN : bit (6) >
diff --git a/openbsc/src/libbsc/system_information.c b/openbsc/src/libbsc/system_information.c
index bf20394..d40bbaf 100644
--- a/openbsc/src/libbsc/system_information.c
+++ b/openbsc/src/libbsc/system_information.c
@@ -905,6 +905,7 @@ static int generate_si6(uint8_t *output, struct gsm_bts *bts)
{
struct gsm48_system_information_type_6 *si6;
int l2_plen = 11;
+ int rc;
memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
@@ -935,8 +936,9 @@ static int generate_si6(uint8_t *output, struct gsm_bts *bts)
gsm48_set_dtx(&si6->cell_options, bts->dtxu, bts->dtxu, false);
/* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */
+ rc = rest_octets_si6(si6->rest_octets, is_dcs_net(bts));
- return l2_plen;
+ return l2_plen + rc;
}
static struct gsm48_si13_info si13_default = {