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By Peter Rysavy  Wide-Area Wireless Computing

Integration

When you have finally decided what application, what wireless technology and what wireless devices to use, you will be ready for the integration phase. Here are some final items to consider as you integrate your solution.

Wireline Baseline

If at all possible, test your application first over LAN or modem connections. This will reduce the number of variables to evaluate if you encounter problems later with your wireless connection. If your target network is a wireless WAN or cellular connection, using wireline modems at 4,800 or 9,600 bps will give you a rough idea of what throughput to expect. This may allow you to predict how suitable an application is even before field testing over wireless connections.

Testing

Wireless connections may function in one environment yet fail in another and so it is best to test in a variety of environments and conditi ons. For instance, you may be able to simulate the loss of a connection between modem and base station by removing the modem's antenna while it is communicating. Or you could drive out of range of your coverage area. These tests will help you test the tolerance of your application to intermittent connections.

If you are using middleware that employs a server at a central site, test it under the load of multiple mobile stations simultaneously accessing it.

These are just a few examples of some tests to consider. You will undoubtedly think of others.

Pilot

Since wireless networking can pose new challenges you should consider deploying your wireless solution initially using a small number of units in a limited geographic area. Work with this pilot program long enough to understand all the technology and coverage issues. Only then deploy on a broader scale.

Partner with Network Provider or Integrator

If the learning curve for wireless computing feels daunting, choose a wireless network provider that is willing to provide some hand-holding. Or find a system integrator that has expertise in wireless data. There are a large number of integrators and value-added resellers specializing in wireless applications.

Keep in mind that not all wireless networks are fully mature, and problems that arise may not be due to your software or hardware, but due to problems in the carrier's network. Ideally you will have partners that can help you quickly identify the source of problems.

Your Efforts will be Rewarded

Despite the number of issues presented in this chapter, wireless technology is maturing, and many good hardware and software products are available. Once you deploy your system, you will be pleasantly surprised by how well this technology works, and how effective it can be.

Introduction
Planning
Protocols and Interfaces
Har dware
Wireless Middleware
Profile of Wireless Networks
Integration

Updated September 30, 1997

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