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The future generation networks (5G) are expected to achieve high data rates, reduced latency, increased spectral efficiency and energy efficiency of the system. Since the available spectrum is a scarce resource, its efficient utilization is the prime focus of the next generation networks. Spectrum Sharing is a key aspect that is gaining significant attention as it can prove to be beneficial in meeting the above requirements. In this paper we present an exhaustive survey of spectrum sharing for future generation networks. We discuss the different techniques and methods of spectrum sharing based on which a general architecture has been presented. Next, we discuss spectrum sensing, network selection and channel allocation, power optimization in spectrum sharing as well as the security issues associated. Based on the survey a four layer architecture has been proposed depicting the complete spectrum sharing …