Spectrum Management Algorithms
The aim of this work is the investigation of spectrum management methods for IEEE 802.11a based networks, as they are introduced by the 802.11 h standard. As shown in the previous chapter, the standard defines Dynamic Frequency Selection and Transmit Power Control. The standard, however, only defines the signalling which is needed to maintain these spectrum management extensions. It does not specify the decision algorithms which select the frequency channel and the transmit power to be used. The standard only covers the topics which are important for the interoperability between hardware of different manufacturers. In this chapter, different methods to maintain Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) are introduced. The Transmit Power Control is extended by Link Adaptation (LA), which is not specified in the standard as well. Existing WLAN hardware rarely supports spectrum management by DFS and TPC according to the 802.11h standard. Link Adaptation is usually provided as a proprietary extension.
KeywordsAccess Point Mobile Station Fuzzy Controller Mobile Terminal Frequency Channel
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