Add jitter to the application

contrib/traffic-generator/model/ethernet-generator.cc

@@ -6,6 +6,7 @@
 #include "ns3/socket.h"
 #include "ns3/uinteger.h"
 #include "ns3/names.h"
+#include "ns3/double.h"
 #include "ns3/ethernet-net-device.h"
 
 #include <cstdio>
@@ -51,6 +52,11 @@ EthernetGenerator::GetTypeId()
                           TimeValue(Seconds(0)),
                           MakeTimeAccessor(&EthernetGenerator::m_interframe),
                           MakeTimeChecker())
+            .AddAttribute("Jitter",
+                          "Jitter arround the period",
+                          TimeValue(Seconds(0)),
+                          MakeTimeAccessor(&EthernetGenerator::m_jitter),
+                          MakeTimeChecker())
             .AddAttribute("Offset",
                           "Time offset between application start and first packet emission",
                           TimeValue(Seconds(0)),
@@ -114,6 +120,11 @@ EthernetGenerator::StartApplication()
     else if(m_payload_size < MIN_PAYLOAD_SIZE){
       m_payload_size = MIN_PAYLOAD_SIZE;
     }
+
+    m_randVar = CreateObject<UniformRandomVariable> ();
+    m_randVar->SetAttribute ("Min", DoubleValue ((m_period - m_jitter).GetNanoSeconds()));
+    m_randVar->SetAttribute ("Max", DoubleValue ((m_period + m_jitter).GetNanoSeconds()));
+
     m_sendEvent = Simulator::Schedule(m_offset, &EthernetGenerator::SendBurst, this);
 }
 
@@ -128,10 +139,12 @@ void
 EthernetGenerator::SendBurst()
 {
     NS_LOG_FUNCTION(this);
+    NS_ASSERT(m_randVar != nullptr);
     for (int i = 0; i < m_burst_size; i++) {
       Simulator::Schedule(m_interframe*i, &EthernetGenerator::Send, this);
     }
-    m_sendEvent = Simulator::Schedule(m_period, &EthernetGenerator::SendBurst, this);
+    Time period = NanoSeconds(m_randVar->GetValue());
+    m_sendEvent = Simulator::Schedule(period, &EthernetGenerator::SendBurst, this);
 }
 
 void

contrib/traffic-generator/model/ethernet-generator.h

@@ -4,6 +4,7 @@
 #include "ns3/application.h"
 #include "ns3/event-id.h"
 #include "ns3/ptr.h"
+#include "ns3/random-variable-stream.h"
 #include <ns3/traced-callback.h>
 #include "ns3/ethernet-net-device.h"
 
@@ -53,8 +54,11 @@ class EthernetGenerator : public Application
     int m_burst_size;
     Time m_period;
     Time m_interframe;
+    Time m_jitter;
     Time m_offset;
 
+    Ptr<UniformRandomVariable> m_randVar = nullptr;
+
     uint16_t m_vid;
     uint8_t m_pcp;
     uint8_t m_dei;