Change in osmo-pcu[master]: pcuif: Support receiving System Information 2

laforge gerrit-no-reply at lists.osmocom.org
Tue Jun 15 18:53:02 UTC 2021


laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-pcu/+/24621 )

Change subject: pcuif: Support receiving System Information 2
......................................................................

pcuif: Support receiving System Information 2

OsmoPCU will need this SI2 in order to gain knowledge of the BCCH
Frequency List being broadcasted, in order to build a per-MS specific
Neighbour List using NC_FREQUENCY_LIST bits in Packet Measurement Order.

Related: SYS#5303
Change-Id: I4a9c4f70beac6805322a19835a0d30f7247780b4
---
M src/bts.h
M src/pcu_l1_if.cpp
2 files changed, 33 insertions(+), 0 deletions(-)

Approvals:
  Jenkins Builder: Verified
  laforge: Looks good to me, approved



diff --git a/src/bts.h b/src/bts.h
index 2a7d883..a2f4598 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -231,6 +231,9 @@
 
 	uint8_t si1[GSM_MACBLOCK_LEN];
 	bool si1_is_set;
+	uint8_t si2[GSM_MACBLOCK_LEN];
+	bool si2_is_set;
+	struct gsm_sysinfo_freq si2_bcch_cell_list[1024];
 	uint8_t si3[GSM_MACBLOCK_LEN];
 	bool si3_is_set;
 	uint8_t si13[GSM_MACBLOCK_LEN];
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 0453b92..818cb1a 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -286,9 +286,28 @@
 	return rc;
 }
 
+static int list_arfcn(const struct gprs_rlcmac_bts *bts, const struct gsm_sysinfo_freq *freq, const char *text)
+{
+	int n = 0, i;
+	for (i = 0; i < 1024; i++) {
+		if (freq[i].mask) {
+			if (!n)
+				LOGP(DL1IF, LOGL_INFO, "BTS%d: %s", bts->nr, text);
+			LOGPC(DL1IF, LOGL_INFO, " %d", i);
+			n++;
+		}
+	}
+	if (n)
+		LOGPC(DL1IF, LOGL_INFO, "\n");
+
+	return n;
+}
+
 static int pcu_rx_data_ind_bcch(struct gprs_rlcmac_bts *bts, uint8_t *data, uint8_t len)
 {
+	struct gsm48_system_information_type_2 *si2;
 	const uint8_t *si_ro;
+
 	switch (len) {
 	case 0:
 		/* Due to historical reasons also accept a completely empty message as
@@ -305,6 +324,9 @@
 		case SYSINFO_TYPE_1:
 			bts->si1_is_set = false;
 			break;
+		case SYSINFO_TYPE_2:
+			bts->si2_is_set = false;
+			break;
 		case SYSINFO_TYPE_3:
 			bts->si3_is_set = false;
 			break;
@@ -328,6 +350,14 @@
 			memcpy(bts->si1, data, GSM_MACBLOCK_LEN);
 			bts->si1_is_set = true;
 			break;
+		case GSM48_MT_RR_SYSINFO_2:
+			memcpy(bts->si2, data, GSM_MACBLOCK_LEN);
+			bts->si2_is_set = true;
+			si2 = (struct gsm48_system_information_type_2 *)bts->si2;
+			gsm48_decode_freq_list(bts->si2_bcch_cell_list, si2->bcch_frequency_list,
+					       sizeof(si2->bcch_frequency_list), 0xce, 1);
+			list_arfcn(bts, bts->si2_bcch_cell_list, "SI2 Neighbour cells in same band:");
+			break;
 		case GSM48_MT_RR_SYSINFO_3:
 			memcpy(bts->si3, data, GSM_MACBLOCK_LEN);
 			bts->si3_is_set = true;

-- 
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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: I4a9c4f70beac6805322a19835a0d30f7247780b4
Gerrit-Change-Number: 24621
Gerrit-PatchSet: 2
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: merged
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