Segregating in- and other-cell interference with applications to decentralized admission control

Authors:
Daniel Catrein;Rudolf Mathar
Affiliations:
Ericsson Research, Ericsson GmbH, Herzogenrath, Germany and Institute for Theoretical Information Technology, RWTH Aachen University, Germany;Institute for Theoretical Information Technology, RWTH Aachen University, Germany
Venue:
IEEE Transactions on Communications
Year:
2009

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Abstract

This paper deals with the intertwined problems of feasibility, power allocation and call admission control on the basis of the signal-to-interference-ratio in multi-cell CDMA networks. Positively homogeneous in-cell interference functions are introduced. Under this general concept optimum power allocations are determined by first solving in-cell interference problems with fixed background noise, and subsequently a small system of linear coupling equations. This approach simultaneously clarifies the existence of some power allocation such that minimum SIR requirements are fulfilled. The decomposition is also utilized for designing a decentralized admission control algorithm. Finally, guidelines are given on how required parameters may be estimated in existing network structures.