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Flexible UL-DL Switching Point in TDD Cellular Local Area Wireless Networks

机译：TDD蜂窝局域网无线网络中的灵活UL-DL切换点

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摘要

An advantage of time division duplex (TDD) wireless networks over frequency division duplex (FDD) is that the UL-DL switching point may be flexibly adapted to asymmetric traffic loads. This enables more efficient spectrum use, but on the other hand may lead to harmful cross-link interference between cells. As a result, the net gain (or loss) from flexible TDD depends on the traffic characteristics and network scenario. In this paper we address the problem in local area packet data networks, such as small- or femto-cell network, where high fluctuation in short term traffic loads is expected. We show through analysis and system level simulations that in such a scenario a significant gain in effective user throughput and packet delays may be achieved under low traffic loads. At high load the gain becomes smaller as packets accumulate in queues and there is both UL and DL traffic to transmit with high probability. When the UL and DL transmit powers are not balanced and switching point adaptation is applied the link direction with lower power may provide degraded performance. We show that introducing interference awareness at the scheduler provides more balanced performance and lowers the packet delays further.
机译：时分双工（TDD）无线网络优于频分双工（FDD）的优势在于，UL-DL交换点可以灵活地适应非对称流量负载。这样可以更有效地使用频谱，但另一方面可能导致小区之间有害的交联干扰。结果，灵活TDD的净收益（或损失）取决于流量特性和网络情况。在本文中，我们解决了局部分组数据网络（例如小型或毫微微小区网络）中的问题，在这些网络中，短期话务量的波动预计会很大。我们通过分析和系统级仿真显示，在这种情况下，在低流量负载下，可以有效提高用户吞吐量和数据包延迟。在高负载下，随着数据包在队列中累积，增益会变小，并且同时有UL和DL流量要传输。当UL和DL发射功率不平衡并且应用了切换点自适应功能时，功率较低的链路方向可能会降低性能。我们表明，在调度程序中引入干扰感知可提供更平衡的性能，并进一步降低数据包延迟。

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