Reduce Monthly Wireless Data Costs by Adding WiFi
As I discussed in my previous post ‘Wireless Communication: Freedom at a Cost’, sending data over wireless networks can be expensive. Cellular networks are the most commonly used public data networks for fleet applications because of their broad coverage areas, but are costly because they charge per byte sent. With a private network like WiFi (802.11), transmitting data is free after the initial hardware investment, but the coverage area is limited by how many access points are installed and their location in respect to the vehicles. Access points can only be installed at private properties owned by the fleet, such as dispatch centers and storage yards, so the coverage area will never be large enough to include the fleet’s entire operating area.
However, a WiFi network will be able to reach vehicles at the beginning of the day as they leave the yard and at the end of the day when they return. Although this accounts for a relatively small amount of time, it may end up including a large amount of the data sent to a vehicle each day. For example, many dispatch applications send a manifest to each vehicle at the start of the day. The manifest is usually large, often 10 or 20 times bigger than the real-time location/status messages sent periodically throughout the day. If the manifest is sent while the vehicle is in WiFi coverage, the organization won’t have to pay for any of that data on their monthly plans. Once you factor in end of day uploads (such as high resolution GPS logs) and software updates, a fleet could end up transmitting more than half its monthly data over WiFi.
So while it’s not practical to use WiFi as the only means of sending data to vehicles, it will save an organization a significant amount of money if used as a supplemental network. When evaluating a mobile data system you should make sure both the mobile devices and the server software are capable of supporting simultaneous cellular and WiFi network connections. They should also be able to give the WiFi connection higher priority and automatically switch to it as soon as a vehicle moves into coverage. Lastly, ensure that mobile software updates can be scheduled to occur overnight and only transmit over the WiFi network.
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Well informative article you got there. Now i am realize that it is should be that way. Keep posting.