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A traditional cellular system (e.g., LTE) operates only on the licensedspectrum. This tutorial explains the concept of cellular communications on bothlicensed and license-exempt spectrum under a unified architecture. The purposeto extend a cellular system into the bandwidth-rich license-exempt spectrum isto form a larger cellular network for all spectrum types. This would result inan ultimate mobile converged cellular network. This tutorial examines thebenefits of this concept, the technical challenges, and provides a conceptualLTE-based design example that helps to show how a traditional cellular systemlike the LTE can adapt itself to a different spectrum type, conform to theregulatory requirements, and harmoniously co-exist with the incumbent systemssuch as Wi-Fi. In order to cope with the interference and regulation rules onlicense-exempt spectrum, a special medium access mechanism is introduced intothe existing LTE transmission frame structure to exploit the full benefits ofcoordinated and managed cellular architecture.

Cellular Communications on License-Exempt Spectrum: A Tutorial