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Modified transmission procedures for optimized in-house networking – Potential of optimization in the scope of IEEE 802.11

By an intelligent use of the wireless medium, the peak power and the pulsed nature of IEEE 802.11 (WLAN) based transmissions may be reduced. State-of-the-art WLAN technology transmits with the maximum available power (usually 20 dBm). The physical data rate will be chosen in a way that a specific packet repetition rate will not be exceeded. In fact, for many applications a lower physical data rate will suffice.

A crosslayer optimization permits to adapt the data rate to the applications' needs. This allows for reducing the transmission power and yields a continuous channel allocation.

Staff members performed a comprehensive measurement campaign to gather a vast set of realistic power transfer functions for the residential scenario. Both frequency bands at 2.4 GHz and 5.2 GHz were considered. On this basis, the potential of optimization will be evaluated in the scope of our work. Options like transmit power control and automatic rate selection will also be considered for the analysis of the optimization potential.

Further reduction of transmit power can be achieved by using intelligent antenna systems. This is a very interesting approach for high transmission frequencies that are operated by WLAN.

This work has been done in the scope of the project “Minimierung der Immissionen künftiger Funkdienste” (miniWatt II) promoted by the German federal ministry of education and research (BMBF).


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Dr.-Ing. Wolfgang Endemann
Tel.: 0231 755-3195