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CSE 4215 / 5431 Lab Manual: Part II

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Copyright by N. Vlajic

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Overview of EDX Wireless EDX Wireless software products are a collection of commercial modeling and design tools for wireless communication systems that run under Windows 98/2000/NT/XP. With EDX Wireless it is possible to predict service areas and path performance using advanced propagation models that account for terrain and groundcover features. It is also possible to model the behavior of radio signals in and around the buildings in urban settings. As such, the software is suitable for modeling/design/analysis of either of the following wireless systems:

Wireless LAN; Cellular; Paging; Broadcast; Multicast, etc.

For more see: http://www.edx.com/

Lab Objectives The objectives of this lab include:

reinforce the concepts of cellular system design and traffic engineering; investigate the effects of demographic, traffic, terrain and land-use data on the

performance of multi-cellular systems; expose students to a commercial software tool for planning of single-cell and

multi-cellular systems. Lab Location and Equipment EDX Wireless V5.3.2 evaluation software is available in CSEB 2052 Lab, on machines: homnet01, homnet02, and homnet03. Use the following to log onto these machines: Username: 4215lab. Password: 4215lab.

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1. Introduction: Basic info on Demo Map This lab will is based on the EDX demo map for the Eugene (Oregon) area, as provided in the evaluation version of the software. Eugene is Oregons second largest city, it covers approximately 36 square miles, and it is the home to more than 160,000 people. The center of the area covered in the demo map is:

43 45 degree North latitude; 122 124 degree West longitude.

2. Open Demo Map/Project You can start EDX software by using the following menu path: Start Programs EDX SignalPro 5.3 Evaluation To begin a cellular study using the Cell-demo project already created:

1. Go to the File menu and select OpenProject. 2. In the folder tree, under EDX Projects Sample_Projects select a project

called Cell_Demo. 3. On the opening map you will see a study grid, six 3-sector cell sites, and a

service boundary outline. 4. Click on the Network Design/Analysis 1G/2G/2.5G Cellular/PCS System

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Type/Service Area to access the special cellular design features. (Here, observe that the demo has been set up to operate as a CDMA system.)

5. To access the actual system parameters, click on CDMA System Parameters. Now, answer the following questions by filling in the blanks:

Parameter Value CDMA chip rate

Target uplink Eb/No Handoff initiate threshold Handoff drop threshold

Total channel codes available Orthogonality factor

What does the last parameter Orthogonality factor refer to? ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ (For the above answer, you could try researching on the Internet, or simply check: http://www.adc.com/Library/Literature/103889AE.pdf .)

3. View Cell-Site Details By opening the Cell_Demo file, you will already see a 6 cell / 18 sector system laid out in the Eugene area. You can use EDXs drawing features to modify your view of the cell site layout.

1. To view the detailed information associated with a site, right-click on that cell site, and select Site Properties

2. If you would like to move a cell site, either enter the new desired latitude and longitude into the Transmitter/Base/Hub Site Details dialog box, or hold down the shift key and the left mouse button to drag that cell site to a new location.

3. To add a cell site, click on the New Site button on the tool bar (the 20th button from right) and drag the cursor image to the desired location. The program automatically establishes the cell site elevation from the terrain database and adds the site to the RF Systems Transmitter/Base/Hub Sites Master group Edit group list.

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Now, answer the following questions by filling in the blanks:

Sector Elevation

Antenna height (m)

Antenna gain (dBi)

Max transmit power (dBW)

Required service threshold (dBm)

AAAA0001 105.0 30.0 10 10.00 -92.4 dBm

AAAB0001

AAAC0001

AAAD0001

AAAE0001

AAAF0001

Sector Name

Predicted traffic (mErlangs)

Predicted traffic (Mbps)

AAAA0001 5184.o 5.2

AAAB0001

AAAC0001

AAAD0001

AAAE0001

AAAF0001

4. Review Background Data Demographic, traffic, terrain, and land-use data analysis are critical to determine cell cites.

1. Go to Map menu, select Traffic data and make a check mark on the Show Traffic Data. Next, click on the button Set color level, and check out the color levels. Observe, yellow color is 100 mErlang area, red color is 90-100 mErlang, etc.

2. Click on the OK button in the traffic data window. You will see several major yellow colored area (i.e. areas of high traffic intensity) on the map of the city of Eugene.

3. Click on the Map Map Layers, and using the Move Down button put traffic data layer under transmitter/base/hub sites, in order to see the positions of the existing sites with respect to the predicted traffic intensity.

4. Repeat steps 1. to 3. for Demographic Data, Terrain Data, and Land Use Data.

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Traffic Data Map

Terrain Data Map

Demographic Data Map

Land Use Data Map

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What relationship do you see among the four obtained graphs? ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________

5. Cellular System Studies: Received Power, Most Likely Server, Handoff Regions You can do various studies of the system coverage, such as: A) most likely server(s), B) most likely server areas, C) handoff areas, etc. 5.A Most Likely Server(s) To identify the 1st and 2nd server for a particular area in the map

1. Simply move the mouse across the given are the 1st server (together with the respective signal strength) and the 2nd server will be noted in the status bar at the bottom of the screen.

2. Accordingly, you can identify which cell sites need to be modified to improve the coverage of the given area.

What are the 1st and 2nd most likely server at the point: N 44 5 and W 123? ________________________________________________________________ 5.B Most Likely Server Areas To do the study of most likely server areas:

1. From the main menu, select Network Design/Analysis 1G/2G/2/5G Cellular/PCS Static Area Studies

2. In the Area Studies dialog box, you will se several CDMA studies in the list. Toward the bottom of the Area Studies dialog box are two check boxes.

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Note: in the default setting, (only) CDMA reverse link Eb/N0 has both boxes checked: Calculate Study and Show on status bar / track mouse. Hence the respective map of this study is, by default, made available and displayed in the main window.

3. Highlight Strongest (most likely) Server study, and check the boxes Calculate Study and Show on status bar

4. Choose OK to exit the dialog box. 5. Click on the Area Study button (the 17th button from right on the toolbar). As the

study is being performed, appropriate status messages will be displayed. The study may take a few minutes.

6. In the Map Map Layers dialog box, highlight the Strongest (most likely) Server study, and use the Move up/down button to put this layer near the top of the list (leave only transmitter/base/hub sites above).

Submit together with this report your map of the Strongest (most likely) Server, as obtained through the above procedure! 5.C Handoff Areas To do the study of handoff areas:

1. From the main menu, select Network Design/Analysis 1G/2G/2/5G Cellular/PCS Static Area Studies

2. In the Area Studies dialog box, click on the Add Study button. 3. In the Area Study Details dialog box, under Area study type, select CDMA

handoff regions, and choose OK to exit the dialog box. 4. Now, back in the Area Studies dialog box, highlight CDMA handoff regions

study, and check the respective boxes Calculate Study and Show on status bar

5. Choose OK to exit the Area Studies dialog box. 6. Click on the Area Study button (the 17th button from right on the toolbar) to

perform the study. 7. In the Map Map Layers dialog box, highlight the CDMA handoff regions

study, and use the Move up/down button to put this layer near the top of the list (leave only transmitter/base/hub sites above).

What is the difference between blue- and red-colored handoff areas? ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ (For the above answer, you might want to check EDX Help Cellular/CDMA

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Module, then search for handoff.) Submit together with this report your map of the CDMA handoff regions map, as obtained through the above procedure! Samples of Strongest (most likely) Server map CDMA handoff regions map are provided below.

Strongest (most likely) Server Map - sample

CDMA handoff regions Map - sample

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6. Cellular System Studies: Change in Traffic Intensity Changes in the underlying traffic patterns can seriously affect the system performance.

1. In the Map Map Layers dialog box, put transmitter/base/hub sites as the first, and CDMA reverse link Eb/No as the second layer.

2. Right-click on cell site AAAC, select sector AAAC0001 Properties Channels / Traffics . Change the predicted traffic intensity from 1601.5 mErlangs to 20,000.0 mErlangs.

3. Choose OK to exit the CDMA Channels, and then again OK to exit the Transmitter/Base/Hub Site Details dialog box.

4. Click on the Area Study button (the 17th button from right on the toolbar) to perform the study under the new traffic conditions.

5. At the end of the study, a new map of CDMA reverse link Eb/No will appear on the screen.

What do you notice in the new map? How does it differ from the initial map? Explain! (Note: The reverse CDMA channel refers to the mobile-to-cell direction of communication, while the forward CDMA channel refers to the cell-to-mobile direction of communication.) ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________

7. Cellular System Studies: Reduced Number of Sites

1. Right-click on the site AAAC and select the Delete the site option. 2. Click on the Area Study button (the 17th button from right on the toolbar) to

perform the study under the new conditions. 3. At the end of the study, a new map of CDMA reverse link Eb/No will appear on

the screen.

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What do you notice in the new map? How does it differ from the initial map? Explain! ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________