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=Wireless |
=Towards using 900 MHz for Wireless IEEE 802.11 LANs <br/><br/> Measurements in an Indoor Testbed= |
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Assigned to: Moritz Grauel, Mathias Naber |
Assigned to: Moritz Grauel, Mathias Naber |
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Advisor: Mathias Kurth |
Advisor: Mathias Kurth |
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Submission: March 2008 |
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Paper available at: [http://www.informatik.hu-berlin.de/~naber/paper.pdf http://www.informatik.hu-berlin.de/~naber/paper.pdf] |
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==Problem Statement== |
==Problem Statement== |
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To explore further use cases for wireless mesh networks – evading congested frequency |
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bands is required. Achieving soft real time or simply bridge larger distances – the require- |
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ments simply exceed the physical specifications given by today’s IEEE 802.11 networks. |
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Entering the relatively new and still not wide-spread 900MHz WLAN, we make use of an WLAN-device named "Ubiquity SR 900". We have do evaluate these devices and make some basic measurements, then we want to compare these results to the "well known" WLAN-frequencies in the ISM-band (2.4GHz and 5GHz). |
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Some saw their opportunity to modify existing IEEE 802.11 hardware to operate at dif- |
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ferent frequency bands. How to determine possible improvements? |
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The “Wireless Testbed Framework” is a set of tools to ease and automate testing and |
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evaluating of new hardware in an existing, experimental wireless mesh network. It is |
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targeted to small and embedded devices running openWRT or similar embedded Linux |
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variants. The main purpose is to manage measurement scripts and schedule the execution |
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of those scripts as well as to collect the measurement results. |
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Many measurements on wireless link performance have been made. We present |
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link performance results – comparing different frequency bands at 900 MHz, 2400 MHz |
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and 5000 MHz – performed with our automated measurement framework. The Ubiquity |
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SR9 900 MHz WiFi adapter is compared to off the shelf WiFi hardware. The link quality |
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and the bit error patterns of the different frequencies are analyzed and compared to each |
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other. |
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==Deliverables== |
==Deliverables== |
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Latest revision as of 16:23, 7 April 2008
Towards using 900 MHz for Wireless IEEE 802.11 LANs
Measurements in an Indoor Testbed
Assigned to: Moritz Grauel, Mathias Naber
Advisor: Mathias Kurth
Submission: March 2008
Paper available at: http://www.informatik.hu-berlin.de/~naber/paper.pdf
Problem Statement
To explore further use cases for wireless mesh networks – evading congested frequency bands is required. Achieving soft real time or simply bridge larger distances – the require- ments simply exceed the physical specifications given by today’s IEEE 802.11 networks. Some saw their opportunity to modify existing IEEE 802.11 hardware to operate at dif- ferent frequency bands. How to determine possible improvements?
The “Wireless Testbed Framework” is a set of tools to ease and automate testing and evaluating of new hardware in an existing, experimental wireless mesh network. It is targeted to small and embedded devices running openWRT or similar embedded Linux variants. The main purpose is to manage measurement scripts and schedule the execution of those scripts as well as to collect the measurement results. Many measurements on wireless link performance have been made. We present link performance results – comparing different frequency bands at 900 MHz, 2400 MHz and 5000 MHz – performed with our automated measurement framework. The Ubiquity SR9 900 MHz WiFi adapter is compared to off the shelf WiFi hardware. The link quality and the bit error patterns of the different frequencies are analyzed and compared to each other.
Deliverables
Our plan is to develop a modular framework which allows easy measurement of wireless links independent from used hardware.
Prior Art
There was a lot of research about 2.4GHz and 5GHz WLANs which explored neary everything. It showed, the used frequency isn't ideal for the desired task.
At this moment, the new 900MHz is still not widespread and shows some great potential.
Key Ideas / Project Execution Plan
- paper-work
Project Log
- tried some different MadWifi-drivers - basic ping measurements (packet loss, round trip time, ...)