Inter-cell transmit power adaptation algorithm for coexistence of white space applications

White space, the unused local TV channels, are ready to be used for unlicensed wireless devices. Due to its propagation characteristics, availability of white space channels can be limited in a densely populated area. This paper presents an inter-cell transmit power adaptation (ITPA) algorithm that enhances the decision procedure of a negotiation-based transmit power control (TPC) in the selection of a shareable channel and the decision of the new transmit power level of neighboring white space applications (WSAs) on the shareable channel. For the evaluation of the algorithm, we conduct theoretical analysis and simulation and prove that the ITPA algorithm can assist the newly-joining WSAs to find shareable channels with neighboring WSAs for the negotiation-based TPC. We expect that the enhancement in channel assignment contributes to an increase in the accommodation of newly-joining WSAs although all channels are occupied.