WIKINDX Resources
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Thesis/Dissertation:
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BibTeX citation key: Rahamatullah2009
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K. Rahamatullah, "Implementation and Evaluation of Regular Channel Access for Cooperative Spectrum Sharing between Coexisting WLAN Systems," MSc Master thesis, Universität Bremen, Bremen, Germany, 2009.
Added by: Martina Kammann 2009-06-29 13:44:43
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Attached file: 
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Abstract
At the present era, Wireless Local Area Networks (WLANs) are one of the most popular and successful wireless technologies in the world and are being used widely, for instance, at home, at the office and in public places because of its easy deployment and low cost. A well-known standard for WLAN is IEEE 802.11. Because of the wide use of WLAN technology, there is a high probability that more than one WLAN system belonging to the same standard such as 802.11 or also to different standards is collocated in the same frequency band inside the same geographical area. The problem generally faced by the users of such systems is that transmissions can become slower or connections can be interrupted because of collisions and interference that is created by inefficient sharing of the same spectrum. Therefore, from the economical and technical point of view, it is necessary to develop a spectrum sharing algorithm so that IEEE 802.11 networks can coexist with competing systems of the same or different technologies. A suitable way to maintain the coexistence is the centralized HCCA channel access method defined in IEEE 802.11e. This standard, however, only specifies the signaling for centralized channel access, but not the decision scheme which assigns airtime to the mobile stations. For this reason, the standard is extended in this thesis by a method called Regular Channel Access which is specially tailored to maintain the coexistence between neighboring networks, so that spectrum will be shared efficiently in both homogeneous and heterogeneous coexistence scenarios. In comparison to the legacy Distributed Coordination Function (DCF) of 802.11, Quality of Service (QoS) will be gained using the Regular Channel Access method. In this thesis, Regular Channel Access is implemented in the openWNS simulator for investigations. The simulation results show that the spectrum can be shared efficiently using the Regular Channel Access Method increasing the success rate of the packets up to 100%. Moreover, the throughput is increased using this method, and the QoS requirements are met.
Added by: Martina Kammann
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