diff --git a/src/tbf_ul.cpp b/src/tbf_ul.cpp
index eb2c720..31bb273 100644
--- a/src/tbf_ul.cpp
+++ b/src/tbf_ul.cpp
@@ -839,3 +839,9 @@
 {
 	tbf->usf_timeout();
 }
+
+
+bool ul_tbf_contention_resolution_done(const struct gprs_rlcmac_ul_tbf *tbf)
+{
+	return tbf->m_contention_resolution_done;
+}