Index: src/wifi/model/mpdu-standard-aggregator.cc |
=================================================================== |
new file mode 100644 |
--- /dev/null |
+++ b/src/wifi/model/mpdu-standard-aggregator.cc |
@@ -0,0 +1,155 @@ |
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
+/* |
+ * Copyright (c) 2013 |
+ * |
+ * 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: Ghada Badawy <gbadawy@gmail.com> |
+ */ |
+#include "ns3/log.h" |
+#include "ns3/uinteger.h" |
+ |
+#include "ampdu-subframe-header.h" |
+#include "mpdu-standard-aggregator.h" |
+ |
+NS_LOG_COMPONENT_DEFINE ("MpduStandardAggregator"); |
+ |
+namespace ns3 { |
+ |
+NS_OBJECT_ENSURE_REGISTERED (MpduStandardAggregator); |
+ |
+TypeId |
+MpduStandardAggregator::GetTypeId (void) |
+{ |
+ static TypeId tid = TypeId ("ns3::MpduStandardAggregator") |
+ .SetParent<MpduAggregator> () |
+ .AddConstructor<MpduStandardAggregator> () |
+ .AddAttribute ("MaxAmpduSize", "Max length in bytes of an A-MPDU", |
+ UintegerValue (32767), |
+ MakeUintegerAccessor (&MpduStandardAggregator::m_maxAmpduLength), |
+ MakeUintegerChecker<uint32_t> ()) |
+ ; |
+ return tid; |
+} |
+ |
+uint32_t |
+MpduStandardAggregator::GetAmpduSize(void) |
+{ |
+ return m_maxAmpduLength; |
+} |
+ |
+MpduStandardAggregator::MpduStandardAggregator () |
+{ |
+} |
+ |
+MpduStandardAggregator::~MpduStandardAggregator () |
+{ |
+} |
+ |
+bool |
+MpduStandardAggregator::Aggregate (Ptr<const Packet> packet, Ptr<Packet> aggregatedPacket) |
+{ |
+ NS_LOG_FUNCTION (this); |
+ Ptr<Packet> currentPacket; |
+ AmpduSubframeHeader currentHdr; |
+ |
+ uint32_t padding = CalculatePadding (aggregatedPacket); |
+ uint32_t actualSize = aggregatedPacket->GetSize (); |
+ |
+ if ((4 + packet->GetSize () + actualSize + padding) <= m_maxAmpduLength) |
+ { |
+ if (padding) |
+ { |
+ Ptr<Packet> pad = Create<Packet> (padding); |
+ aggregatedPacket->AddAtEnd (pad); |
+ } |
+ currentHdr.SetCrc (1); |
+ currentHdr.SetSig (); |
+ currentHdr.SetLength (packet->GetSize ()); |
+ currentPacket = packet->Copy (); |
+ |
+ currentPacket->AddHeader (currentHdr); |
+ aggregatedPacket->AddAtEnd (currentPacket); |
+ return true; |
+ } |
+ return false; |
+} |
+void |
+MpduStandardAggregator::AddHeaderAndPad (Ptr<Packet> packet, bool last) |
+{ |
+ NS_LOG_FUNCTION (this); |
+ AmpduSubframeHeader currentHdr; |
+ //This is called to prepare packets feom the aggregte queue to be sent so no need to check on total sie since it has already been |
+ //done before when deciding how many packets to add to the queue |
+ currentHdr.SetCrc (1); |
+ currentHdr.SetSig (); |
+ currentHdr.SetLength (packet->GetSize ()); |
+ packet->AddHeader (currentHdr); |
+ uint32_t padding = CalculatePadding (packet); |
+ |
+ if (padding && !last) |
+ { |
+ Ptr<Packet> pad = Create<Packet> (padding); |
+ packet->AddAtEnd (pad); |
+ } |
+ |
+} |
+bool |
+MpduStandardAggregator::CanBeAggregated (uint32_t packetSize, Ptr<Packet> aggregatedPacket, uint8_t blockAckSize) |
+{ |
+ |
+ uint32_t padding = CalculatePadding (aggregatedPacket); |
+ uint32_t actualSize = aggregatedPacket->GetSize (); |
+ if (blockAckSize > 0) |
+ blockAckSize = blockAckSize+4+padding; |
+ if ((4 + packetSize + actualSize + padding+blockAckSize) <= m_maxAmpduLength) |
+ return true; |
+ else |
+ return false; |
+} |
+bool |
+MpduStandardAggregator::AggregateAtFront (Ptr<const Packet> packet, Ptr<Packet> aggregatedPacket) |
+{ |
+ NS_LOG_FUNCTION (this); |
+ Ptr<Packet> currentPacket; |
+ AmpduSubframeHeader currentHdr; |
+ |
+ uint32_t padding = CalculatePadding (packet); |
+ uint32_t actualSize = aggregatedPacket->GetSize (); |
+ |
+ if ((4 + packet->GetSize () + actualSize + padding) <= m_maxAmpduLength) |
+ { |
+ currentHdr.SetCrc (1); |
+ currentHdr.SetSig (); |
+ currentHdr.SetLength (packet->GetSize ()); |
+ currentPacket = packet->Copy (); |
+ if (padding) |
+ { |
+ Ptr<Packet> pad = Create<Packet> (padding); |
+ currentPacket->AddAtEnd (pad); |
+ } |
+ currentPacket->AddHeader (currentHdr); |
+ currentPacket->AddAtEnd (aggregatedPacket); |
+ |
+ return true; |
+ } |
+ return false; |
+} |
+uint32_t |
+MpduStandardAggregator::CalculatePadding (Ptr<const Packet> packet) |
+{ |
+ return (4 - (packet->GetSize () % 4 )) % 4; |
+} |
+ |
+} // namespace ns3 |