Carrier aggregation in heterogeneous cellular networks
Carrier aggregation in heterogeneous cellular networks
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DOI：
10.1109/icc.2013.6655410
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发表时间：
2013-06
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影响因子：
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通讯作者：
Xingqin Lin;J. Andrews;R. Ratasuk;B. Mondal;Amitava Ghosh
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作者：
Xingqin Lin;J. Andrews;R. Ratasuk;B. Mondal;Amitava Ghosh
异构网络（HetNet）和载波聚合（CA）是下一代蜂窝网络的两个不同特征。HetNet中的小小区对于数据卸载至关重要，与仅使用宏小区相比，可以显着提高区域和小区边缘频谱效率。CA通过在物理层上聚合多个分量载波来进一步增加传输带宽并因此增加网络容量。在本文中，我们提出了一个易于处理的多波段多层模型来研究多流CA在HetNets，其中基站的位置在每一层遵循一个独立的泊松点过程。我们的模型采用了适当的负载概念，允许偏置对HetNet性能的影响的研究。对于由两层（宏小区和小小区）和两个频带（800MHz频带和2.4GHz频带）组成的典型HetNet，我们观察到，与没有偏置的情况相比，如果小小区采用最佳偏置因子，则增益（就UE遍历率而言）约为35%至40%。我们的模型还纳入了频带部署的影响。对于所描述的典型HetNet，我们的研究表明，在宏小区和小小区中部署800MHz频段和2.4GHz频段有助于HetNet最好地利用CA功能。
Heterogeneous networks (HetNets) and carrier aggregation (CA) are two distinct features of next-generation cellular networks. Small cells in HetNets are vital for data off-loading and can significantly improve area and cell edge spectral efficiency compared to using just macrocells. CA further increases the transmission bandwidth and thus network capacity by aggregating multiple component carriers on the physical layer. In this paper, we propose a tractable multi-band multi-tier model to study multi-flow CA in HetNets, where base station positions in each tier follow an independent Poisson point process. Our model incorporates an appropriate notion of load which allows the study of the impact of biasing on HetNet performance. For a typical HetNet consisting of two tiers, macro cells and small cells, and two bands, 800MHz band and 2.4GHz band, we observe that the gain (in terms of UE ergodic rate) is about 35% to 40% if the small cells adopt optimal biasing factor compared to the case without biasing. Our model also incorporates the impact of band deployment. For the typical HetNet described, our study suggests that deploying the 800MHz band and 2.4GHz band in both the macro and small cells helps the HetNet best exploit the CA feature.