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Unified Diff: src/internet/model/tcp-highspeed.h

Issue 122010043: SOCIS2014 - Tcp variants (Closed)
Patch Set: Fixing private/protected membership and fixed documentation Created 8 years, 9 months ago
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Index: src/internet/model/tcp-highspeed.h
diff --git a/src/internet/model/tcp-highspeed.h b/src/internet/model/tcp-highspeed.h
new file mode 100644
index 0000000000000000000000000000000000000000..fb18d998b69c1dc4642faacb21b95846bd8d47fc
--- /dev/null
+++ b/src/internet/model/tcp-highspeed.h
@@ -0,0 +1,103 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014 Natale Patriciello, <natale.patriciello@gmail.com>
+ *
+ * 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
+ *
+ */
+
+#ifndef TCPHIGHSPEED_H
+#define TCPHIGHSPEED_H
+
+#include "ns3/tcp-newreno.h"
+
+namespace ns3 {
+
+/**
+ * \ingroup tcp
+ *
+ * \brief An implementation of TCP HighSpeed
+ *
+ * TCP HighSpeed is designed for high-capacity channels or, in general, for
+ * TCP connections with large congestion windows.
+ * Conceptually, with respect to the standard TCP, HighSpeed makes the
+ * cWnd grow faster during the probing phases and accelerates the
+ * cWnd recovery from losses.
+ * This behavior is executed only when the window grows beyond a
+ * certain threshold, which allows TCP Highspeed to be friendly with standard
+ * TCP in environments with heavy congestion, without introducing new dangers
+ * of congestion collapse.
+ * At the core of TCP HighSpeed there are two functions, a(w) and b(w), which respectively
+ * specify the cWnd growth addendum and the cWnd reduction factor when
+ * given an actual cWnd value w.
+ *
+ * More information: http://dl.acm.org/citation.cfm?id=2756518
+ */
+class TcpHighSpeed : public TcpNewReno
+{
+public:
+ /**
+ * \brief Get the type ID.
+ * \return the object TypeId
+ */
+ static TypeId GetTypeId (void);
+
+ /**
+ * Create an unbound tcp socket.
+ */
+ TcpHighSpeed (void);
+
+ /**
+ * \brief Copy constructor
+ * \param sock the object to copy
+ */
+ TcpHighSpeed (const TcpHighSpeed& sock);
+
+ virtual ~TcpHighSpeed (void);
+
+protected:
+ virtual Ptr<TcpSocketBase> Fork (void);
+ virtual void NewAck (SequenceNumber32 const& seq);
+ virtual void DupAck (const TcpHeader& t, uint32_t count);
+ virtual void Retransmit (void);
+
+private:
+ /**
+ * \brief Lookup table for the coefficent a (from RFC 3649)
+ *
+ * \param w Window value (in packets)
+ *
+ * \return the coefficent a
+ */
+ uint32_t TableLookupA (uint32_t w);
+
+ /**
+ * \brief Lookup table for the coefficent b (from RFC 3649)
+ *
+ * \param w Window value (in packets)
+ *
+ * \return the coefficent b
+ */
+ double TableLookupB (uint32_t w);
+
+ /**
+ * \brief Update cWnd and ssTh after a loss event
+ *
+ */
+ void Loss ();
+};
+
+} // namespace ns3
+
+#endif // TCPHIGHSPEED_H
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