Utility-based power control with QoS support

  • Authors:

  • Sławomir Stańczak;Angela Feistel;Marcin Wiczanowski;Holger Boche

  • Affiliations:

  • Fraunhofer German-Sino Lab for Mobile Communications, Berlin, Germany 10587 and Heinrich-Hertz Chair, Faculty of EECS, Technical University of Berlin, Berlin, Germany 10587;Heinrich-Hertz Chair, Faculty of EECS, Technical University of Berlin, Berlin, Germany 10587;Fraunhofer German-Sino Lab for Mobile Communications, Berlin, Germany 10587;Fraunhofer German-Sino Lab for Mobile Communications, Berlin, Germany 10587 and Heinrich-Hertz Chair, Faculty of EECS, Technical University of Berlin, Berlin, Germany 10587

  • Venue:
  • Wireless Networks
  • Year:
  • 2010

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Abstract

This paper addresses the issue of incorporating QoS requirements expressed in terms of some minimum SIR targets into the traditional utility-based power control problem. As suitable projection methods seem to be not amenable to distributed implementation, we first focus on a primal-dual algorithm to solve the utility-based power control problem subject to the SIR requirements. We prove a global convergence of the algorithm for a large class of utility functions and show that it can be implemented in a distributed wireless environment. However, the approach has an important drawback: An optimal solution may not exist as the SIR targets may be infeasible due to, for instance, channel effects. This motivates a reformulation of the problem so that an optimal solution always exists. We consider the possibility of using a barrier method to closely approach the desired SIRs of the users and combine this approach with the conventional utility-based power control problem to incorporate best effort users. We prove relevant properties of optimal solutions and propose a distributed recursive algorithm with global convergence. Finally, the performance of the proposed approaches is verified by simulations.