Add high-accuracy ToA value to Uplink Measurement Reports

Normal Abis RSL MEasurement Results contain only the "MS Timing Offset
IE" in units of full symbols.  In some use cases it is important to have
higher-accuracy timing information exposed to the BSC.

We do this by adding the average timing offset value during the last
measurement interval in 1/256th symbol accuracy to the "Supplementary
MEasuremen Information" part of the TS 48.058 9.3.25 Uplink Measurements
IE.

In order to avoid any compatibility issues, this feature is only enabled
if the new vty config command "supp-meas-info toa256" at the bts node
is enabled.

Change-Id: Ie85e53b47d4041cc4e6d7b78406ae8b79b2d9397

1 files changed, 28 insertions, 0 deletions

diff --git a/src/common/vty.c b/src/common/vty.c
index 3938de5b..b57e0192 100644
--- a/src/common/vty.c
+++ b/src/common/vty.c
@@ -295,6 +295,8 @@ static void config_write_bts_single(struct vty *vty, struct gsm_bts *bts)
 		VTY_NEWLINE);
 	if (strcmp(btsb->pcu.sock_path, PCU_SOCK_DEFAULT))
 		vty_out(vty, " pcu-socket %s%s", btsb->pcu.sock_path, VTY_NEWLINE);
+	if (bts->supp_meas_toa256)
+		vty_out(vty, " supp-meas-info toa256%s", VTY_NEWLINE);
 
 	bts_model_config_write_bts(vty, bts);
 
@@ -624,6 +626,30 @@ DEFUN(cfg_bts_pcu_sock, cfg_bts_pcu_sock_cmd,
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_bts_supp_meas_toa256, cfg_bts_supp_meas_toa256_cmd,
+	"supp-meas-info toa256",
+	"Configure the RSL Supplementary Measurement Info\n"
+	"Report the TOA in 1/256th symbol periods\n")
+{
+	struct gsm_bts *bts = vty->index;
+	struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
+
+	bts->supp_meas_toa256 = true;
+	return CMD_SUCCESS;
+}
+
+DEFUN(cfg_bts_no_supp_meas_toa256, cfg_bts_no_supp_meas_toa256_cmd,
+	"no supp-meas-info toa256",
+	NO_STR "Configure the RSL Supplementary Measurement Info\n"
+	"Report the TOA in 1/256th symbol periods\n")
+{
+	struct gsm_bts *bts = vty->index;
+	struct gsm_bts_role_bts *btsb = bts_role_bts(bts);
+
+	bts->supp_meas_toa256 = false;
+	return CMD_SUCCESS;
+}
+
 
 #define DB_DBM_STR 							\
 	"Unit is dB (decibels)\n"					\
@@ -1559,6 +1585,8 @@ int bts_vty_init(struct gsm_bts *bts, const struct log_info *cat)
 	install_element(BTS_NODE, &cfg_bts_min_qual_norm_cmd);
 	install_element(BTS_NODE, &cfg_bts_max_ber_rach_cmd);
 	install_element(BTS_NODE, &cfg_bts_pcu_sock_cmd);
+	install_element(BTS_NODE, &cfg_bts_supp_meas_toa256_cmd);
+	install_element(BTS_NODE, &cfg_bts_no_supp_meas_toa256_cmd);
 
 	install_element(BTS_NODE, &cfg_trx_gsmtap_sapi_cmd);
 	install_element(BTS_NODE, &cfg_trx_no_gsmtap_sapi_cmd);