Extended DCA paradigm for distributed licensed open spectrum coordination

The inappropriate or under-use of spectrum offers new perspective for a secondary usage of spectrum between heterogeneous radio access technologies. This spectrum sharing can be achieved at the expense of an appropriate management of the co-channel interference between the different radio access technologies. This paper proposes an extended dynamic channel allocation (eDCA) scheme for providing distributed and real non SIR (signal to interference ratio) based spectrum sharing. The trunking gain performance of eDCA is analyzed and compared to simple fixed channel allocation (FCA), FCA with channel borrowing and DCA for FDMA based systems. Sensitivity analysis of the performance is provided. In particular, results show that careful inter-radio access technologies reuse frequency distance coordination is required between heterogeneous radio systems to ensure that pooling frequencies results in gain to the systems. The appropriate capacity management relies on the activation of the right strategy in the right traffic load condition