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Dynamic time-division duplex (D-TDD) has emerged as an effective solution toaccommodate the unaligned downlink and uplink traffic in small cell networks.However, the flexibility of traffic configuration also introduces additionalinter-cell interference. In this letter, we study the effectiveness of applyingfractional frequency reuse (FFR) as an interference coordination technique forD-TDD small cell networks. We derive the analytical expressions of downlink anduplink mean packet throughput (MPT), then study a network parameteroptimization problem to maximize MPT while guaranteeing each user's throughput.Numerical results corroborate the benefits of the proposed FFR-based D-TDD interms of improving throughput.

Throughput Analysis of Small Cell Networks under D-TDD and FFR