This document describes a tutorial on implementing QoS mechanisms for device-to-device communication. The tutorial demonstrates tagging packets with QoS identifiers, running a simulation of D2D communication between mobile nodes using the NS-3 simulator, and analyzing output files to observe QoS performance including flow delays. Students modify QoS configurations and investigate the impact on results. The document provides an agenda for the tutorial sessions and instructions for tasks like configuring the simulator and interpreting simulation results.

1. Introduction Tutorial C6 Conclusion
DCCN Tutorial C6: Implementation of QoS
mechanisms for Device-to-Device (D2D)
communication
Pavel Masek, Jiri Hosek
Brno University of Technology,
Faculty of Electrical Engineering and Communication,
Department of Telecommunication.
masekpavel@feec.vutbr.cz, hosek@feec.vutbr.cz
November 24, 2016

2. Introduction Tutorial C6 Conclusion
WISLAB Research Group – http://www.wislab.cz
WISLAB - Wireless System Laboratory of Brno
Coordinated by Dr. Hosek
Experienced researchers and MSc. / Ph.D.
students
Working with the up-to-date equipment
Nowadays, focused mainly on the IoT domain
Communication in 4G / 5G mobile networks
Intel US, Huawei, AT&T, TUT, IITIS, PFUR, SUAI
SmartHome Gateway
Telekom Austria Group
Wearables
Augmented reality, smart glasses
MTC Communication in NS-3
Member of well-known alliances AllSeen Alliance or HGi
Contributor to 3GPP standards and recommendations

3. Introduction Tutorial C6 Conclusion
DCCN Tutorials: Agenda
Tutorial #1 [Wed 23.11.16] - Communication between
devices within LAN/WLAN networks
Tutorial #2 [Thu 24.11.16] - Implementation of 4G cellular
communication within the SmartGrid ecosystem
Tutorial #3 [Thu 24.11.16] - Implementation of
QoS mechanisms for Device-to-Device (D2D)
communication between mobile devices
Main goal
From basic network topology to advanced communication
mechanisms used in today’s IoT/M2M scenarios – utilizing
Network Simulator 3 (NS-3) tool for timely use-cases

4. Introduction Tutorial C6 Conclusion
Network Scenario
Mobile nodes located in grid (initial position)
Communication without the AP → D2D communication
RandomWalk2d mobility model
QoS implementation – made from scratch, not
implemented in NS-3 by default

5. Introduction Tutorial C6 Conclusion
Tasks
1 Check structure of given code, understand to QoS
implementation
2 Run the prepared simulation scenario
3 View *.xml output files via netAnim, explore tracing
*.pcap files using Wireshark, generate GnuPlot file for
flow delay
4 Modify the QoS configuration for data flows and check
new results
0 = AC BE (Best Effort)
1, 2 = AC BK (Background)
3 = AC BE NQOS (Best Effort no QoS)
4, 5 = AC VI (Video first)
6, 7 = AC VO (Voice first)

6. Introduction Tutorial C6 Conclusion
T0: Eclipse Configuration 1/5
Copy the third tutorial (tutorial 3 qos.cc) into the scratch
folder: /home/student/ns-allinone-3.23/ns-3.23/scratch

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T0: Eclipse Configuration 2/5
Open the copied file in Eclipse environment

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T0: Eclipse Configuration 3/5
Run → Run configuration

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T0: Eclipse Configuration 4/5
Search project → tutorial 3 qos → Run

10. Introduction Tutorial C6 Conclusion
T0: Eclipse Configuration 5/5

11. Introduction Tutorial C6 Conclusion
T1: QoS Implementation 1/2
void ReceivePacket (Ptr <const Packet > packet , const
Address &)
{
NS_LOG_UNCOND ("Received one packet!");
QosTag q_tag;
if (packet ->PeekPacketTag(q_tag))
{
NS_LOG_UNCOND ("Packet Tag value " << (int)q_tag.
GetTid ());
}
}
void TagMarker (uint8_t tid , Ptr <const Packet > packet)
{
QosTag qosTag;
qosTag.SetTid(tid);
packet ->AddPacketTag (qosTag);
}

12. Introduction Tutorial C6 Conclusion
T1: QoS Implementation 2/2
Ptr <OnOffApplication > onoffapp;
onoffapp = DynamicCast <OnOffApplication >( serverApps.
Get (0));
onoffapp -> TraceConnectWithoutContext ("Tx",
MakeBoundCallback (& TagMarker ,3));
// -----------------------------
Ptr <OnOffApplication > onoffapp2;
onoffapp2 = DynamicCast <OnOffApplication >(
serverApps2.Get (0));
onoffapp2 -> TraceConnectWithoutContext ("Tx",
MakeBoundCallback (& TagMarker ,5));
// -----------------------------
Config :: ConnectWithoutContext ("/NodeList /0/
ApplicationList /5/ $ns3 :: PacketSink/Rx",
MakeCallback (& ReceivePacket));

13. Introduction Tutorial C6 Conclusion
T3: Simulation 1/3
Populating routing tables

14. Introduction Tutorial C6 Conclusion
T3: Simulation 2/3
UDP communication - VoIP (voice/video)

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T3: Simulation 3/3
TCP communication - FTP (data transfer)

16. Introduction Tutorial C6 Conclusion
T3: FlowMonitor - QoS = 6 (voice/video)
Flow ID: 2 Src Addr 10.1.3.1 Dst Addr 10.1.3.6
Tx Packets = 508
Rx Packets = 508
Delay Sum = +287402154072.0 ns
Delay = +565752271.0 nsns
Delay = +565.0 nsms
Jitter Sum = +5085947027.0 ns
Jitter = +10031453.0 nsns
Throughput: 590.069 Kbps
Lost Packets = 0

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T3: QoS Config – Wireshark
FTP (data traffic; TCP)
VoIP (video; UDP)

18. Introduction Tutorial C6 Conclusion
T3: GnuPlot - Flows Delay
Open terminal (go to
/home/student/ns-allinone-3.23/ns-3.23) → gnuplot
delay.plt
Open delay.png

19. Introduction Tutorial C6 Conclusion
Final Conclusion
D2D communication utilizing WiFi Direct
Static routing
Routing protocols (AODV, DSDV, etc.)
QoS tag added for any data flow → tested in Wireshark
Visualization using netAnim tool
Results automatically generated by GnuPlot and
FlowMonitor

20. Introduction Tutorial C6 Conclusion
Thank you for your attention.
Pavel Masek, Jiri Hosek
masekpavel@feec.vutbr.cz, hosek@feec.vutbr.cz
Brno University of Technology,
Faculty of Electrical Engineering and Communication,
Department of Telecommunication.