The mobile communication technologies beyond the third generation are characterized by flexibility. Due to rapid growth of spectrum demand, future wireless networks should be able to dynamically allocate resources to maintain the quality of service (QoS) and promote the efficient use of radio spectrum. The dynamic spectrum management is an effective solution for approaching this goal. In this paper, we propose a new heuristic method for sharing spectrum between two different radio access technologies (RAT) in an intra-operator scenario. We designed a new dynamic spectrum manager that aims to prevent overload in RATs and improves spectrum utilization of RATs. Our approach contains two complimentary phases of action, the first phase tries to prevent overload of a RAT in a proactive manner, and the second phase tries to solve an overload situation in case the proactive phase fails to prevent it.
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