Attach UE to eNodeB

[Vaison]

I have two files, in one of them I can see how UEs are attached to different eNodebs but in the other one is not working well but I don't know why... Could someone shed light on it please?

These one is work well, I can see how 3 UEs are attached to one eNodeb and the rest (2) are attached to the other eNodeB

#include <ns3/core-module.h>
#include <ns3/network-module.h>
#include <ns3/mobility-module.h>
#include <ns3/lte-module.h>
#include <ns3/buildings-helper.h>
#include <ns3/point-to-point-helper.h>

using namespace ns3;

int main (int argc, char *argv[])
{
  LogComponentEnable ("LteEnbPhy", LOG_LEVEL_INFO);

        double Time = 0.5;
        uint16_t j = 0;
        uint16_t h = 1;
        uint16_t numberOfUEs = 5;
        uint16_t numberOfeNbs = 2;

    Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();

    NodeContainer enbNodes;
    enbNodes.Create (numberOfeNbs);
    NodeContainer ueNodes;
    ueNodes.Create (numberOfUEs);

    MobilityHelper mobility;
    mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
    mobility.Install (enbNodes);
    mobility.Install (ueNodes);
   
    //Install an LTE protocol stack on the UE and eNBs
    NetDeviceContainer enbDevs;
    enbDevs = lteHelper->InstallEnbDevice (enbNodes);
    NetDeviceContainer ueDevs;
    ueDevs = lteHelper->InstallUeDevice (ueNodes);

    // Attach the UEs to an eNB.
      for (uint16_t i = 0; i < numberOfUEs; i++)
      {
          if ( i % 2 != 0 ){
            lteHelper->Attach (ueDevs.Get(i), enbDevs.Get(j));
        }
        else{
            lteHelper->Attach (ueDevs.Get(i), enbDevs.Get(h));
        }
      }

    // Activate an EPS Bearer including the setup of the Radio Bearer between an eNB and its attached UE
    enum EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
    EpsBearer bearer (q);
    lteHelper->ActivateDataRadioBearer (ueDevs, bearer);
   
    Simulator::Stop (Seconds (Time));

    Simulator::Run ();
   
    Simulator::Destroy ();
    return 0;
}

But in that one I couldn't see it!!

#include "ns3/lte-helper.h"
#include "ns3/epc-helper.h"
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/internet-module.h"
#include "ns3/mobility-module.h"
#include "ns3/lte-module.h"
#include "ns3/applications-module.h"
#include "ns3/point-to-point-helper.h"
#include "ns3/config-store.h"

using namespace ns3;

int main (int argc, char *argv[])
{
    LogComponentEnable ("LteEnbPhy", LOG_LEVEL_INFO);

  uint16_t numberOfUEs = 5;
  uint16_t numberOfeNbs = 2;
  uint16_t j = 0;
  uint16_t h = 1;
  double simTime = 0.5;
  double distance = 60.0;
  double interPacketInterval = 100;

  Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();
  Ptr<PointToPointEpcHelper>  epcHelper = CreateObject<PointToPointEpcHelper> ();
  lteHelper->SetEpcHelper (epcHelper);

  Ptr<Node> pgw = epcHelper->GetPgwNode ();

   // Create a single RemoteHost
  NodeContainer remoteHostContainer;
  remoteHostContainer.Create (1);
  Ptr<Node> remoteHost = remoteHostContainer.Get (0);
  InternetStackHelper internet;
  internet.Install (remoteHostContainer);

  // Create the Internet
  PointToPointHelper p2ph;
  p2ph.SetDeviceAttribute ("DataRate", DataRateValue (DataRate ("100Gb/s")));
  p2ph.SetDeviceAttribute ("Mtu", UintegerValue (1500));
  p2ph.SetChannelAttribute ("Delay", TimeValue (Seconds (0.010)));
  NetDeviceContainer internetDevices = p2ph.Install (pgw, remoteHost);
  Ipv4AddressHelper ipv4h;
  ipv4h.SetBase ("1.0.0.0", "255.0.0.0");
  Ipv4InterfaceContainer internetIpIfaces = ipv4h.Assign (internetDevices);
  // interface 0 is localhost, 1 is the p2p device
  Ipv4Address remoteHostAddr = internetIpIfaces.GetAddress (1);

  Ipv4StaticRoutingHelper ipv4RoutingHelper;
  Ptr<Ipv4StaticRouting> remoteHostStaticRouting = ipv4RoutingHelper.GetStaticRouting (remoteHost->GetObject<Ipv4> ());
  remoteHostStaticRouting->AddNetworkRouteTo (Ipv4Address ("7.0.0.0"), Ipv4Mask ("255.0.0.0"), 1);

  NodeContainer ueNodes;
  NodeContainer enbNodes;
  enbNodes.Create(numberOfeNbs);
  ueNodes.Create(numberOfUEs);

  // Install Mobility Model
  Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();
  for (uint16_t i = 0; i < numberOfUEs; i++)
    {
      positionAlloc->Add (Vector(distance * i, 0, 0));
    }
  MobilityHelper mobility;
  mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
  mobility.SetPositionAllocator(positionAlloc);
  mobility.Install(enbNodes);
  mobility.Install(ueNodes);

  // Install LTE Devices to the nodes
  NetDeviceContainer enbLteDevs = lteHelper->InstallEnbDevice (enbNodes);
  NetDeviceContainer ueLteDevs = lteHelper->InstallUeDevice (ueNodes);

  // Install the IP stack on the UEs
  internet.Install (ueNodes);
  Ipv4InterfaceContainer ueIpIface;
  ueIpIface = epcHelper->AssignUeIpv4Address (NetDeviceContainer (ueLteDevs));
  // Assign IP address to UEs, and install applications
  for (uint32_t u = 0; u < ueNodes.GetN (); ++u)
    {
      Ptr<Node> ueNode = ueNodes.Get (u);
      // Set the default gateway for the UE
      Ptr<Ipv4StaticRouting> ueStaticRouting = ipv4RoutingHelper.GetStaticRouting (ueNode->GetObject<Ipv4> ());
      ueStaticRouting->SetDefaultRoute (epcHelper->GetUeDefaultGatewayAddress (), 1);
    }

  // Attach one UE per eNodeB
  for (uint16_t i = 0; i < numberOfUEs; i++)
      {
        if ( i % 2 != 0 ){
            lteHelper->Attach (ueLteDevs.Get(i), enbLteDevs.Get(j));
        }
        else{
            lteHelper->Attach (ueLteDevs.Get(i), enbLteDevs.Get(h));
        }
        // side effect: the default EPS bearer will be activated
      }

  // Install and start applications on UEs and remote host
  uint16_t dlPort = 1234;
  uint16_t ulPort = 2000;
  uint16_t otherPort = 3000;
  ApplicationContainer clientApps;
  ApplicationContainer serverApps;
  for (uint32_t u = 0; u < ueNodes.GetN (); ++u)
    {
      ++ulPort;
      ++otherPort;
      PacketSinkHelper dlPacketSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), dlPort));
      PacketSinkHelper ulPacketSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), ulPort));
      PacketSinkHelper packetSinkHelper ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), otherPort));
      serverApps.Add (dlPacketSinkHelper.Install (ueNodes.Get(u)));
      serverApps.Add (ulPacketSinkHelper.Install (remoteHost));
      serverApps.Add (packetSinkHelper.Install (ueNodes.Get(u)));

      UdpClientHelper dlClient (ueIpIface.GetAddress (u), dlPort);
      dlClient.SetAttribute ("Interval", TimeValue (MilliSeconds(interPacketInterval)));
      dlClient.SetAttribute ("MaxPackets", UintegerValue(1000000));

      UdpClientHelper ulClient (remoteHostAddr, ulPort);
      ulClient.SetAttribute ("Interval", TimeValue (MilliSeconds(interPacketInterval)));
      ulClient.SetAttribute ("MaxPackets", UintegerValue(1000000));

      UdpClientHelper client (ueIpIface.GetAddress (u), otherPort);
      client.SetAttribute ("Interval", TimeValue (MilliSeconds(interPacketInterval)));
      client.SetAttribute ("MaxPackets", UintegerValue(1000000));

      clientApps.Add (dlClient.Install (remoteHost));
      clientApps.Add (ulClient.Install (ueNodes.Get(u)));
      if (u+1 < ueNodes.GetN ())
        {
          clientApps.Add (client.Install (ueNodes.Get(u+1)));
        }
      else
        {
          clientApps.Add (client.Install (ueNodes.Get(0)));
        }
    }
  serverApps.Start (Seconds (0.01));
  clientApps.Start (Seconds (0.01));
  lteHelper->EnableTraces ();

  Simulator::Stop(Seconds(simTime));
  Simulator::Run();

  Simulator::Destroy();
  return 0;

}

I don't like to do that because are to many lines but I couldn't find my mistake.

Regards,

~V

[Konstantinos]

Hi,

What do you mean that in the second one it is not working well. Aren't the nodes attached?

Because I run both your scripts without any problem and the generated LTE traces showed that all UEs send/receive packets.

On Thursday, January 15, 2015 at 6:05:38 PM UTC, Vaison wrote:

I have two files, in one of them I can see how UEs are attached to different eNodebs but in the other one is not working well but I don't know why... Could someone shed light on it please?

[Vaison]

Maybe I'm wrong but...when I execute the script I said is not working well, I have the follow output (just show the last output, I know before is attached):

-----sub frame 6-----
0x1bd5e80 eNB Expected TBs 0
-----sub frame 6-----
0x1bdc910 eNB Expected TBs 0
-----sub frame 7-----
0x1bd5e80 eNB Expected TBs 0
-----sub frame 7-----
0x1bdc910 eNB Expected TBs 0
-----sub frame 8-----
0x1bd5e80 eNB Expected TBs 0
-----sub frame 8-----
0x1bdc910 eNB Expected TBs 0
-----sub frame 9-----
0x1bd5e80 eNB Expected TBs 0
-----sub frame 9-----
0x1bdc910 eNB Expected TBs 0
-----sub frame 10-----
0x1bd5e80 eNB Expected TBs 0
-----sub frame 10-----
0x1bdc910 eNB Expected TBs 0

And now I'm gonna put the output of the "good" script:

-----sub frame 6-----
0x1b44f20 eNB Expected TBs 2
0x1b44f20 RNTI 1 NEW TB
0x1b44f20 RNTI 2 NEW TB
-----sub frame 6-----
0x1b48050 eNB Expected TBs 3
0x1b48050 RNTI 1 NEW TB
0x1b48050 RNTI 2 NEW TB
0x1b48050 RNTI 3 NEW TB
-----sub frame 7-----
0x1b44f20 eNB Expected TBs 2
0x1b44f20 RNTI 1 NEW TB
0x1b44f20 RNTI 2 NEW TB
-----sub frame 7-----
0x1b48050 eNB Expected TBs 3
0x1b48050 RNTI 3 HARQ RETX
0x1b48050 RNTI 1 NEW TB
0x1b48050 RNTI 2 NEW TB
-----sub frame 8-----
0x1b44f20 eNB Expected TBs 2
0x1b44f20 RNTI 1 NEW TB
0x1b44f20 RNTI 2 NEW TB
-----sub frame 8-----
0x1b48050 eNB Expected TBs 3
0x1b48050 RNTI 1 NEW TB
0x1b48050 RNTI 2 NEW TB
0x1b48050 RNTI 3 NEW TB
-----sub frame 9-----
0x1b44f20 eNB Expected TBs 2
0x1b44f20 RNTI 1 NEW TB
0x1b44f20 RNTI 2 NEW TB
-----sub frame 9-----
0x1b48050 eNB Expected TBs 3
0x1b48050 RNTI 1 NEW TB
0x1b48050 RNTI 2 NEW TB
0x1b48050 RNTI 3 NEW TB
-----sub frame 10-----
0x1b44f20 eNB Expected TBs 2
0x1b44f20 RNTI 1 NEW TB
0x1b44f20 RNTI 2 NEW TB
-----sub frame 10-----
0x1b48050 eNB Expected TBs 3
0x1b48050 RNTI 1 NEW TB
0x1b48050 RNTI 2 NEW TB
0x1b48050 RNTI 3 NEW TB

Why these different results?

I know in both UE are attached but... I don't know why the behavior isn't the same. Why?

Regards,

~V

[Konstantinos]

They are different scenarios... so the outputs should be different. Some of the obvious differences:

The first has activated a dedicated EPS bearer, no actual traffic though is generated.

The second us based has also EPC, no dedicated EPS bearer and several applications.

[Vaison]

First of all many thanks for your answer Konstantinos!
Then ok,got it, but... Are there another way to show those info? or the info related to which UE is connected a specific eNB?

Regards,

~V

[Konstantinos]

You can use the tracing system and connect to a trace source, e.g. LteUeRrc::ConnectionEstablished that can provide the UE and ENB info when a RRC connection is established.

[Vaison]

Many thanks!

I use this line
 

Config::Connect ("/NodeList/*/DeviceList/*/LteEnbRrc/ConnectionEstablished", MakeCallback (&NotifyConnectionEstablishedEnb));

And this function

void NotifyConnectionEstablishedEnb (std::string context,
                                uint64_t imsi,
                                uint16_t cellid,
                                uint16_t rnti)
{
  std::cout << Simulator::Now ().GetSeconds () << " " << context
            << " eNB CellId " << cellid
            << ": successful connection of UE with IMSI " << imsi
            << " RNTI " << rnti
            << std::endl;
}

And I can see thats work perfectly! Maybe I could use something easier....

Regards,

~V

[Abida Pervven]

Hi all

I am a new learner of ns3. this group is very helping to understand ns3 basics. can you please tell me where to add these lines as i am adding in the badassign code and having error like

[

1035/2422] Compiling scratch/BADassign1.cc
../scratch/BADassign1.cc: In function ‘int main(int, char**)’:
../scratch/BADassign1.cc:28:93: error: ‘NotifyConnectionEstablishedEnb’ was not declared in this scope

 Config::Connect ("/NodeList/*/DeviceList/*/LteEnbRrc/ConnectionEstablished", MakeCallback (&NotifyConnectionEstablishedEnb));

Abida                                                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~