Packet loss problem between UE and eNodeB in LTE

[Yu-Xiang Huang]

Hi,

I have a simulation that intends to measure the QoS between the UEs and the associated eNodeB in the

LTE network. However, I found the packet loss rate is much higher (nearly 50%) than I expected, even if

the simulation and the amount of background traffic are small. Please help me to identify the problem

of the high packet loss rate in the simulation. The simulation environment is as follows:

Total UEs: 240

Total eNodeBs: 20

==> 20 UEs are associated with each eNodeB

The traffic from each UE includes the following three applications (by the on-off application):

The on-time is 1, and the off-time is 0 for all apps.

App A(UDP): DataRate: 20 kb/s

                        PacketSize: 75 bytes

                      MaxBytes:0

App B(TCP): DataRate: 20 kb/s

                      PacketSize: 75 bytes

                      MaxBytes:0

App C(UDP): DataRate: 75 kb/s

                      PacketSize: 100 bytes

                      MaxBytes:0

In the above, I want to measure the packet loss rate from App A and App B, and the traffic from App C is the background traffic.

All UEs run App A and App B, but only three out of 20 UEs for each eNodeB run App C. Because the background traffic is
relatively smaller than the traffic from App A and App B and the total traffic rate is not high, the packet loss rate is not supposed
to be as high as nearly 50%. This looks weird.

Note:

1. set the EpcTft :EpsBearer is NGBR_VIDEO_TCP_DEFAULT

2. Sample distribution: fading_trace_EPA_3kmph.fad

3. EnbDeviceAttribute: DlEarfcn:100

                                     UlEarfcn:18100

Thanks.

[sahar abdi]

hello Huang

i have question about on-off app

in the my code , for on-off app on tcp:

for (uint32_t b = 0; b < numBearersPerUe; ++b)

745  {

746  ++dlPort;

747  ++ulPort;

748 

749  ApplicationContainer clientApps;

750  ApplicationContainer serverApps;

751 

775  if (epcDl)

776  {

777  NS_LOG_LOGIC ("installing TCP DL app for UE " << u);

778  BulkSendHelper dlClientHelper ("ns3::TcpSocketFactory",

779  InetSocketAddress (ueIpIfaces.GetAddress (u), dlPort));

780  dlClientHelper.SetAttribute ("MaxBytes", UintegerValue (0));

781  clientApps.Add (dlClientHelper.Install (remoteHost));

782  PacketSinkHelper dlPacketSinkHelper ("ns3::TcpSocketFactory",

783  InetSocketAddress (Ipv4Address::GetAny (), dlPort));

784  serverApps.Add (dlPacketSinkHelper.Install (ue));

785  }

786  if (epcUl)

787  {

788  NS_LOG_LOGIC ("installing TCP UL app for UE " << u);

789  BulkSendHelper ulClientHelper ("ns3::TcpSocketFactory",

790  InetSocketAddress (remoteHostAddr, ulPort));

791  ulClientHelper.SetAttribute ("MaxBytes", UintegerValue (0));

792  clientApps.Add (ulClientHelper.Install (ue));

793  PacketSinkHelper ulPacketSinkHelper ("ns3::TcpSocketFactory",

794  InetSocketAddress (Ipv4Address::GetAny (), ulPort));

795  serverApps.Add (ulPacketSinkHelper.Install (remoteHost));

796  }

820  Time startTime = Seconds (startTimeSeconds->GetValue ());

821  serverApps.Start (startTime);

822  clientApps.Start (startTime);


How did you do this?

در پنجشنبه 7 دسامبر 2017، ساعت 21:49:13 (UTC+3:30)، Yu-Xiang Huang نوشته:

[Yu-Xiang Huang]

Hello abdi

this is my code for on-off app(include TCP and UDP):

"""

//*

//server app and install,dlport = 80

PacketSinkHelper dlPacketSinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), dlPort));

PacketSinkHelper dlPacketSinkHelper_2 ("ns3::UdpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), dlPort));

  

serverApps.Add(dlPacketSinkHelper.Install (remoteHost));

serverApps.Add(dlPacketSinkHelper_2.Install (otherNode));

//*

// traffic A, mechost is an fake IP, just a target to send packet

OnOffHelper UEappToSendtoMEC ("ns3::UdpSocketFactory", Address ());

UEappToSendtoMEC.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

UEappToSendtoMEC.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

AddressValue mecAddress (InetSocketAddress (Ipv4Address(mechost), dlPort));

UEappToSendtoMEC.SetAttribute ("Remote", mecAddress);

UEappToSendtoMEC.SetAttribute ("DataRate", DataRateValue (DataRate("20kb/s")));

UEappToSendtoMEC.SetAttribute ("PacketSize", UintegerValue (75));

UEappToSendtoMEC.SetAttribute ("MaxBytes", UintegerValue (0));

//*

// traffic B

OnOffHelper UEappToSendtoCentral ("ns3::TcpSocketFactory", Address ());

UEappToSendtoCentral.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

UEappToSendtoCentral.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

AddressValue remoteAddress (InetSocketAddress (remoteHostAddr, CentralPort));

UEappToSendtoCentral.SetAttribute ("Remote", remoteAddress);

UEappToSendtoCentral.SetAttribute ("DataRate", DataRateValue (DataRate("20kb/s")));

UEappToSendtoCentral.SetAttribute ("PacketSize", UintegerValue (75));

UEappToSendtoCentral.SetAttribute ("MaxBytes", UintegerValue (0));

//*

//traffic C

OnOffHelper UEappBkTraffic ("ns3::UdpSocketFactory", Address ());

UEappBkTraffic.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));

UEappBkTraffic.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));

AddressValue otherForBkAddress (InetSocketAddress (otherAddr, dlPort));

UEappBkTraffic.SetAttribute ("Remote", otherForBkAddress);

UEappBkTraffic.SetAttribute ("DataRate", DataRateValue (DataRate("70kb/s")));

UEappBkTraffic.SetAttribute ("PacketSize", UintegerValue (100));

UEappBkTraffic.SetAttribute ("MaxBytes", UintegerValue (0));

//*

//Traffic A and B install (All UE)

for(uint32_t i=0; i<GameUeNum; i++){

  clientApps.Add(UEappToSendtoMEC.Install (ueNodes.Get(i)));

  clientApps.Add(UEappToSendtoCentral.Install (ueNodes.Get(i)));

}

//*

//Traffic C install

for(uint32_t i =0 ; i<UeBackGroundList.size();i++){

  uint16_t UeIndex = UeBackGroundList[i];

  Ptr<Node> TempNode = ueNodes.Get(UeIndex);

  clientApps.Add (UEappBkTraffic.Install (TempNode));

 }

//*

//App time setting

serverApps.Start (Seconds (0.1));

clientApps.Start (Seconds (0.5));

clientApps.Stop (Seconds (simTime-1));

serverApps.Stop (Seconds (simTime-0.5));

"""

Maybe problem is I don't process for "BearersPerUe" or ?

Thank you!

sahar abdi於 2017年12月8日星期五 UTC+8下午2時47分15秒寫道：