Issue #25 Replacing usage of TCP RTT estimator with a customized version
In the current commit, RTT estimator does not implement Karn's algorithm
and takes into account all RTT samples, including ambiguous samples from
retransmitted Interests.
diff --git a/utils/ndn-rtt-mean-deviation.h b/utils/ndn-rtt-mean-deviation.h
new file mode 100644
index 0000000..7ceecce
--- /dev/null
+++ b/utils/ndn-rtt-mean-deviation.h
@@ -0,0 +1,70 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+//
+// Copyright (c) 2006 Georgia Tech Research Corporation
+// (c) 2013 University of Arizona
+// (c) 2013 University of California, Los Angeles
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation;
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+// Author: Rajib Bhattacharjea<raj.b@gatech.edu>
+// Cheng Yi <yic@email.arizona.edu>
+// Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+//
+
+// Georgia Tech Network Simulator - Round Trip Time Estimation Class
+// George F. Riley. Georgia Tech, Spring 2002
+
+
+#ifndef NDN_RTT_MEAN_DEVIATION_H
+#define NDN_RTT_MEAN_DEVIATION_H
+
+#include <ns3/ndnSIM/utils/ndn-rtt-estimator.h>
+
+namespace ns3 {
+namespace ndn {
+
+/**
+ * \ingroup ndn
+ *
+ * \brief The modified version of "Mean--Deviation" RTT estimator, as discussed by Van Jacobson that better suits NDN communication model
+ *
+ * This class implements the "Mean--Deviation" RTT estimator, as discussed
+ * by Van Jacobson and Michael J. Karels, in
+ * "Congestion Avoidance and Control", SIGCOMM 88, Appendix A
+ *
+ */
+class RttMeanDeviation : public RttEstimator {
+public:
+ static TypeId GetTypeId (void);
+
+ RttMeanDeviation ();
+ RttMeanDeviation (const RttMeanDeviation&);
+
+ Time AckSeq (SequenceNumber32 ackSeq);
+ void Measurement (Time measure);
+ Time RetransmitTimeout ();
+ Ptr<RttEstimator> Copy () const;
+ void Reset ();
+ void Gain (double g);
+
+private:
+ double m_gain; // Filter gain
+ double m_gain2; // Filter gain
+ Time m_variance; // Current variance
+};
+
+} // namespace ndn
+} // namespace ns3
+
+#endif // NDN_RTT_MEAN_DEVIATION