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Energy issue of cellular access network has drawn much attention in the recent years. In this paper, we propose a Novel Energy-Saving Cell Selection Mechanism (ESCSM) including the energy-saving triggering conditions determination and a regional cell selection algorithm based on traffic. ESCSM selects the BSes which can be switched off without any negative effects to the radio coverage and service provisioning. Simulation results show that ESCSM can save nearly 23% energy one day at most and guarantee the coverage and capacity quality.