Self-Organizing Distributed Inter-Cell Beam Coordination in Cellular Networks with Best Effort Traffic

Abstract : Interference reduction, cooperation and the performance of cell-edge users are important issues in next generation cellular systems. Based on previous works for single-input singleoutput (SISO) systems, we propose a novel interference reducing self-organizing coordination scheme for a multi antenna OFDM system with space division multiple access (SDMA). The proposed Virtual Subband Algorithm (VSA) tries to maximize the overall network utility by adjusting transmit powers on a per beam granularity and leads to a soft fractional frequency reuse. It uses only small additional information exchange between sectors and infrequent additional long-term feedback. Although reducing interference, VSA follows a completely new approach by having all beams switched-on all the time. Simulations show that in static settings compared to a non-cooperative, highly opportunistic, greedy scheduling scheme, VSA achieves significant gains both in the performance of cell-edge users and in the overall system performance, defined in this paper as the geometric average of user throughputs. Moreover it is shown that cell-edge users benefit even in fast-fading cases, although a gain in system-wide performance cannot be guaranteed.
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WiOpt'10: Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, May 2010, Avignon, France. pp.130-137, 2010
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Gerhard Wunder, Martin Kasparick, Alexander Stolyar, Harish Viswanathan. Self-Organizing Distributed Inter-Cell Beam Coordination in Cellular Networks with Best Effort Traffic. WiOpt'10: Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, May 2010, Avignon, France. pp.130-137, 2010. 〈inria-00501495〉

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