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Equipment
We have performed two series of measurements on German highways and autobahns: a series of IEEE 802.11b tests and a series of IEEE 802.11g tests. The objective of theses tests was to validate the feasibility of Drive-thru Internet access at higher speeds, to analyze the link layer characteristics of IEEE 802.11 in these mobile scenarios, and to evaluate the performance of UDP and TCP under the observed conditions.
For all measurement series we have essentially employed a setup with a mobile system (the car with a computer providing an IEEE 802.11 interface) and a fixed system consisting of a fixed station that has been connected to an IEEE 802.11 access point via a Fast Ethernet switch. We have employed different measurement equipment for the two test series:
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For the IEEE 802.11b tests, we have used a Cisco 340 series IEEE 802.11b access point that has been connected to the fixed network infrastructure. For the mobile system, we have used a laptop computer with a Orinoco 802.11b Gold PCMCIA card equipped with an external omni-directional 5 dBi antenna (a Lucent Range Extender) that has been mounted on the car roof.
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For the IEEE 802.11g tests, we have used a D-Link DWL-2000-AP IEEE 802.11g access point that has been equipped with an external omni-directional 8 dBi antenna (a Hawking Technologies H-AO8SI Hi-Gain outdoor antenna). For the mobile system, we have used a laptop computer with a Buffalo G54 IEEE 802.11g PCMCIA card equipped with an external omni-directional 5 dBi antenna (a Freebird IC6500 antenna) that has been mounted on the car roof.
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