From 4ca20707baba9750e4dc0373f8b63cd4525efc3d Mon Sep 17 00:00:00 2001
From: Stefano Avallone <stavallo@unina.it>
Date: Sun, 21 Jun 2020 22:51:58 +0200
Subject: [PATCH] wifi: Backoff is not needed if in sleep mode or off

---
 src/wifi/model/channel-access-manager.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/wifi/model/channel-access-manager.cc b/src/wifi/model/channel-access-manager.cc
index 2592d6723..e8d3aed78 100644
--- a/src/wifi/model/channel-access-manager.cc
+++ b/src/wifi/model/channel-access-manager.cc
@@ -247,6 +247,12 @@ ChannelAccessManager::NeedBackoffUponAccess (Ptr<Txop> txop)
 {
   NS_LOG_FUNCTION (this << txop);
 
+  // No backoff needed if in sleep mode or off
+  if (m_sleeping || m_off)
+    {
+      return false;
+    }
+
   // the Txop might have a stale value of remaining backoff slots
   UpdateBackoff ();