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Activation of nomadic relay nodes in dynamic interference environment for energy saving

: Ren, Z.; Stanczak, S.; Fertl, P.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Communications Society:
IEEE Global Communications Conference, GLOBECOM 2014. Vol.6 : Austin, Texas, USA, 8 - 12 December 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-3513-0
ISBN: 978-1-4799-3512-3
ISBN: 978-1-4799-3511-6
Global Communications Conference (GLOBECOM) <2014, Austin/Tex.>
Conference Paper
Fraunhofer HHI ()

This paper presents an optimization framework for energy savings in nomadic relay networks, where interference and load are changing over time due to varying assignments. We prove the existence of an explicit load function taking assignments as arguments and we show the function is continuously differentiable. Based on the properties of the load function, we design iterative relay and user association algorithm for energy savings, where the non-convex load constraints are linearly approximated such that each sub-problem is a linear program and hence can be solved efficiently. Simulation results confirm that our proposed algorithmic approach leads to a significant reduction of the energy consumption when compared with algorithms considering the worst-case interference.