Intelligent Environments

Homework 2

Due: February 24, 2003 (midnight)

For this assignment you will design and evaluate a network for an intelligent environment; namely, the smart home we have been considering in class. Evaluation will be done by hand as well as by using the OPNET network simulator.

  1. We will use the floor plan of the smart home discussed in class (shown below).

    For future reference, here is a brief description of the home components of interest.

  2. We will use a variety of devices (sensors, monitors, etc.) in and around the home. Here is a list of devices along with data rates. Note that data rates are based on TCP/IP-based packet delivery with a packet size of 1024 bytes (8 Kbits).

    DeviceData Rate
    Temperature sensor (wireless)8 Kbps
    Humidity sensor (wireless)8 Kbps
    Gas sensor (wireless)8 Kbps
    Light sensor (wireless)8 Kbps
    Motion sensor (wireless)8 Kbps
    Cable TV video source10 Mbps
    DVD video source10 Mbps
    Camera video source10 Mbps
    TV video receivern/a
    AM/FM radio audio source500 Kbps
    CD player audio source500 Kbps
    Microphone audio source500 Kbps
    Speaker audio receivern/a
    Computer (Internet)10 Mbps

  3. Devices are placed in the home according to the following constraints. Exact locations are up to you and will affect wireless performance.

  4. The networking components you have available to you are 802.11 wireless access points (APs) and 100 Mbps 24-port switches. You are limited to 4 APs, but any number of switches. The APs and switches can be placed anywhere in the house, and 100Mbps-rated network cable can be run anywhere. You may assume all wireless devices have appropriate transmitters and power, and all other devices have 100 Mbps wired network connections. You may also (unrealistically) assume that there are no delays as packets pass through networking components and cables.

  5. Your network should be able to support the following scenario of simultaneous usage.

  6. Based on the above constraints, design a network for the smart home. Provide a graphical depiction, as well as a verbal description, of our design indicating exact placement of devices and networking components.

  7. Evaluate the network by computing bandwidth needs according to the above scenario and showing that these needs are met by your network.

  8. Simulate your network using OPNET on gamma2. Here's a quick start guide to OPNET. After building your network in OPNET, you will select data sources consistent with the above scenario, and then simulate the network for some length of time, evaluating network throughput.

  9. Write a report describing your network design experience. The report should include the graphical depiction and verbal description of the network, your rationale for the network (i.e., why this design over others), your evaluation of the network, and your OPNET simulation of the network. Your report should be in MSWord (preferred), PDF or PostScript format.

  10. Email your report and your OPNET project files to by the above deadline.