From 2e53478a3b767ec2ce14a400596ee0e354d0a1d4 Mon Sep 17 00:00:00 2001
From: Ismael Gomez <ismael@softwareradiosystems.com>
Date: Mon, 24 Sep 2018 11:26:30 +0200
Subject: [PATCH] Allow time_adv_nsamples parameter to be negative

---
 srsue/src/ue.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/srsue/src/ue.cc b/srsue/src/ue.cc
index 56e8b6c44..daccfca8b 100644
--- a/srsue/src/ue.cc
+++ b/srsue/src/ue.cc
@@ -181,8 +181,10 @@ bool ue::init(all_args_t *args_) {
   
   // Set RF options
   if (args->rf.time_adv_nsamples.compare("auto")) {
-    radio.set_tx_adv(atoi(args->rf.time_adv_nsamples.c_str()));
-  }  
+    int t = atoi(args->rf.time_adv_nsamples.c_str());
+    radio.set_tx_adv(abs(t));
+    radio.set_tx_adv_neg(t<0);
+  }
   if (args->rf.burst_preamble.compare("auto")) {
     radio.set_burst_preamble(atof(args->rf.burst_preamble.c_str()));    
   }