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We develop an analytical framework for the perfor- mance comparison of smallcell networks operating under static time division duplexing (S-TDD) anddynamic TDD (D-TDD). While in S-TDD downlink/uplink (DL/UL) cell transmissionsare synchronized, in D-TDD each cell dynamically allocates resources to themost demanding direction. By leveraging stochastic geom- etry and queuingtheory, we derive closed-form expressions for the UL and DL packet throughput,also capturing the impact of random traffic arrivals and packetretransmissions. Through our analysis, which is validated via simulations, weconfirm that D-TDD outperforms S-TDD in DL, with the vice versa occurring inUL, since asymmetric transmissions reduce DL interference at the expense of anincreased UL interference. We also find that in asymmetric scenarios, wheremost of the traffic is in DL, D-TDD provides a DL packet throughput gain bybetter controlling the queuing delay, and that such gain vanishes in thelight-traffic regime.

Packet Throughput Analysis of Static and Dynamic TDD in Small Cell Networks