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Existing cellular networks suffer from inflexible and expensive equipment, complex control-plane protocols, and vendor-specific configuration interfaces. In this position paper, we argue that software defined networking (SDN) can simplify the design and management of cellular data networks, while enabling new services. However, supporting many subscribers, frequent mobility, fine-grained measurement and control, and real-time adaptation introduces new scalability challenges that future SDNdoi:10.1109/ewsdn.2012.28 dblp:conf/ewsdn/LiMR12 fatcat:xuc5f7i5ofhpvmhavxdilcaujy