Meeting the continued growth in data traffic volume, Dynamic Time Division Duplex (D-TDD) has been introduced as a solution to deal with the uplink (UL) and downlink (DL) traffic asymmetry, mainly observed for dense heterogeneous network deployments, since it is based on instantaneous traffic estimation and provide more flexibility in resource assignment. However, the use of this feature requires new interference mitigation schemes capable of handling two additional types of interference between cells in opposite transmission direction: DL to UL and UL to DL interference. The aim of this work is to provide a complete analytical approach to model inter-cell interference in macro-cell and dense small-cell networks. We derive the explicit expressions of Interference to Signal Ratio (ISR) at each position of the network, in both DL and UL, to quantify the impact of each type of interference on the system performance. Also, we provide the explicit expressions of the coverage probability as functions of different system parameters by covering different scenarios. Finally, through system-level simulations, we analyze the feasibility of D-TDD implementation in both deployments and we compare its performance to the static-TDD (S-TDD) configuration.

为了满足数据流量的持续增长，引入了动态时分双工（D-TDD）作为解决上行链路（UL）和下行链路（DL）流量不对称的解决方案，因为它主要针对密集型异构网络部署基于即时流量估算，并在资源分配方面提供了更大的灵活性。但是，使用此功能需要新的干扰缓解方案，该方案应能够处理在相反传输方向的小区之间的两种其他类型的干扰：DL到UL和UL到DL干扰。这项工作的目的是提供一种完整的分析方法，以对宏小区和密集小小区网络中的小区间干扰进行建模。我们在DL和UL中都得出了网络每个位置的干扰信号比（ISR）的明确表达，量化每种类型的干扰对系统性能的影响。另外，我们通过覆盖不同的场景，提供了覆盖概率作为不同系统参数的函数的显式表达式。最后，通过系统级仿真，我们分析了两种部署中D-TDD实施的可行性，并将其性能与静态TDD（S-TDD）配置进行了比较。