On the Expanded Region of Picocells in Heterogeneous Networks
On the Expanded Region of Picocells in Heterogeneous Networks
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DOI：
10.1109/jstsp.2012.2190381
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发表时间：
2012-03
影响因子：
7.5
通讯作者：
D. López-Pérez;Xiaoli Chu;Ismail Güvenç
中科院分区：
文献类型：
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作者：
D. López-Pérez;Xiaoli Chu;Ismail Güvenç
为了在存在伞宏小区的情况下扩展微微小区的下行链路（DL）覆盖区域，最近提出了范围扩展的概念，其中将正范围扩展偏置（REB）添加到用户设备（UE）处的微微小区导频信号的DL接收信号强度（RSS）。尽管范围扩展可能会增加微微小区的DL足迹，但它也会在微微小区扩展区域（ER）中导致严重的DL小区间干扰，因为ER微微小区用户设备（PUE）没有连接到提供最强DL RSS的小区。在本文中，我们推导了封闭式公式来计算两种不同范围扩展策略的适当REB，研究了DL和上行链路（UL）小区间干扰协调（ICIC）以增强微微小区性能，并提出了一种新的宏小区-微微小区协作调度方案以减轻宏小区对ER PUE造成的DL和UL干扰。仿真结果提供了对微微小区的 REB 选择方法的见解，并证明了所提出的宏小区-微微小区协作调度方案相对于替代方法的优势。
In order to expand the downlink (DL) coverage areas of picocells in the presence of an umbrella macrocell, the concept of range expansion has been recently proposed, in which a positive range expansion bias (REB) is added to the DL received signal strengths (RSSs) of picocell pilot signals at user equipments (UEs). Although range expansion may increase DL footprints of picocells, it also results in severe DL inter-cell interference in picocell expanded regions (ERs), because ER picocell user equipments (PUEs) are not connected to the cells that provide the strongest DL RSSs. In this paper, we derive closed-form formulas to calculate appropriate REBs for two different range expansion strategies, investigate both DL and uplink (UL) inter-cell interference coordination (ICIC) to enhance picocell performance, and propose a new macrocell-picocell cooperative scheduling scheme to mitigate both DL and UL interference caused by macrocells to ER PUEs. Simulation results provide insights on REB selection approaches at picocells, and demonstrate the benefits of the proposed macrocell-picocell cooperative scheduling scheme over alternative approaches.