EECE5155: Wireless Sensor Networks and the Internet of Things Laboratory Assignment 2
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EECE5155: Wireless Sensor Networks and the Internet of Things
Laboratory Assignment 2
Wi-Fi Networks
In this laboratory assignment, you will work on the simulation of WiFi Networks:
. Before starting, you need to read Section 7.3 in the ns-3 Tutorial available in Canvas (Module “Laboratori Assignments”)
. Note that here are three models available for WiFi MAC, namely, Access Point (AP) (ns3::Ap- WifiMac), non-AP Station (STA) (ns3::StaWifiMac), and Ad hoc network (ns3::AdhocWifiMac).
Please use the report template available in the “Laboratory Assignments” module to prepare the report with your solution to this assignment.
Submission materials:
1. Prepare a brief report following the report template in Canvas (add a section to answer the ques-tions included in each Task):
. Task 1:
o Experimental setup: Explain the key lines of your code that you have modified to implement the specific network.
o Results: Comment and include a screenshot of the packet traces in Wireshark and the simulation results (if any).
o Answer the questions at the end of Task 1. When needed include screenshots that support your answers.
o Conclusions: what did you learn?
. Task 2:
o Experimental setup: Explain the key lines of your code that you have modified to implement the specific network.
o Results: Comment and include a screenshot of the packet traces in Wireshark and the simulation results(if any).
o Answer the questions at the end of Task 2. When needed include screenshots that support your answers.
o Conclusions: what did you learn?
2. In your submission, include also your modified .cc files.
Remember: the laboratory assignments can be conducted either individually or in couples. If you want to work in couples, only one of the team members will need to submit the assignment.
Task 1: Wireless Local Area Network – Ad-hoc Mode (55 points)
Define a Wireless Local Area Network (WLAN) operating in Ad-hoc Mode with 5 nodes. Nodes move by following a 2D random walk in a rectangular area defined by the lower-left corner (x=-90 m, y=-90 m) and the upper-right corner (x=90 m, y=90 m). Consider the following specifications:
. Channel: Default wireless channel in ns-3
. Physical Layer:
o Default parameters in IEEE 802.11G standard
o Adaptive rate control given by the AARF algorithm (default)
. Link Layer:
o Standard MAC without quality of service control
o Remember: the network should operate in ad-hoc mode
. Network Layer:
o Standard IPv4
o Address range: 192.168.1.0/24
o Assume that all the nodes behave as ideal routers and can exchange their routing tables
in the background
. Transport Layer:
o UDP
. Application Layer:
o UDP Echo Server at Node 0:
. Listening on port 20
o UDP Echo Client at Node 3:
Sends 2 UDP Echo packets to the server at times 2s and 4s
o UDP Echo Client at Node 4:
Sends 2 UDP Echo packets to the server at times 1s and 2s
o Packet size: 512 bytes
. Additional parameters:
o Set up a packet tracer ONLY on node 2
Answer the following questions:
. Are all the frames acknowledged? Explain why.
. Are there any collisions in the network? Explain why. How have you reached this conclusion?
. How can you force the nodes to utilize the RTS/CTS handshake procedure?
. Force the utilization of RTS/CTS in the network:
o Are there any collisions in data frames now?
o Which is the benefit or RTS/CTS? Briefly explain how RTS/CTS works.
o Where can you find the Network Allocation Vector information?
Task 2: Wireless LAN – Infrastructure Mode (45 points)
Define a Wireless Local Area Network (LAN) operating in Infrastructure Mode with 5 nodes and 1 ac- cess point. Nodes move by following a 2D random walk in a rectangular area defined by the lower-left corner (x=-90 m, y=-90 m) and the upper-right corner (x=90 m, y=90 m). The network name (SSID) should be EECE5155. To start, do not force the handshaking process. Consider the following specifications:
. Channel: Default wireless channel in ns-3
. Physical Layer:
o Default parameters in IEEE 802.11G standard
o Adaptive rate control given by the AARF (default)
. Link Layer:
o Standard MAC without quality of service control
o Remember: the network should operate in infrastructure mode
. Network Layer:
o Standard IPv4
o Address range: 192.168.2.0/24
o Assume that all the nodes behave as ideal routers and can exchange their routing tables
in the background
. Transport Layer:
o UDP
. Application Layer:
o UDP Echo Server at Node 0:
Listening on port 21
o UDP Echo Client at Node 3:
Sends 2 UDP Echo packets to the server at times 2s and 4s
o UDP Echo Client at Node 4:
Sends 2 UDP Echo packets to the server at times 1s and 4s
o Packet size: 512 bytes
. Additional parameters:
o Set up a packet tracer ONLY on node 4(one of the clients) and on the AP.
Answer the following questions:
. Explain the behavior of the AP. What is happening since the very first moment the network starts operating?
. Take a look to a beacon frame. Which are the most relevant parameters defined in it?
. Are there any collisions in the network? When are these collisions happening?
. As in Task 1, force the utilization of the handshaking process and repeat the simulation. Are there any collisions in data frames now? Explain why.
2024-02-25