trxcon: do not advance Uplink TDMA Fn by default

The idea behind advancing Uplink TDMA Fn is to give the transceiver,
which is usually a separate process, some additional time to receive
and prepare Uplink bursts for transmission.  This comes at a price
of having an additional delay between Uplink and Downlink.

Given that trxcon, as a standalone application, is primarily used in
conjunction with fake_trx.py for running ttcn3-bts-test against
osmo-bts-trx, there is no reason to advance the Uplink TDMA Fn.

Change-Id: I838b1ebc54e4c5d116f8af2155d97215a6133ba4
Related: OS#5500

1 files changed, 2 insertions, 2 deletions

diff --git a/src/host/trxcon/src/trxcon_main.c b/src/host/trxcon/src/trxcon_main.c
index 7298f5a2..3901e336 100644
--- a/src/host/trxcon/src/trxcon_main.c
+++ b/src/host/trxcon/src/trxcon_main.c
@@ -79,7 +79,7 @@ static struct {
 	.trx_remote_ip = "127.0.0.1",
 	.trx_bind_ip = "0.0.0.0",
 	.trx_base_port = 6700,
-	.trx_fn_advance = 3,
+	.trx_fn_advance = 0,
 	.phyq_fbsb_extend_fns = 0,
 };
 
@@ -184,7 +184,7 @@ static void print_help(void)
 	printf("  -b --trx-bind     TRX bind IP address (default 0.0.0.0)\n");
 	printf("  -i --trx-remote   TRX remote IP address (default 127.0.0.1)\n");
 	printf("  -p --trx-port     Base port of TRX instance (default 6700)\n");
-	printf("  -f --trx-advance  Uplink burst scheduling advance (default 3)\n");
+	printf("  -f --trx-advance  Uplink burst scheduling advance (default 0)\n");
 	printf("  -F --fbsb-extend  FBSB timeout extension (in TDMA FNs, default 0)\n");
 	printf("  -s --socket       Listening socket for layer23 (default /tmp/osmocom_l2)\n");
 	printf("  -g --gsmtap-ip    The destination IP used for GSMTAP (disabled by default)\n");