D2D Enhanced Heterogeneous Cellular Networks With Dynamic TDD

D2D Enhanced Heterogeneous Cellular Networks With Dynamic TDD
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具有动态 TDD 的 D2D 增强型异构蜂窝网络

DOI:
10.1109/twc.2015.2418192
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发表时间:
2014-06
影响因子:
10.4
通讯作者:
Quek Tony Q. S.
Quek Tony Q. S.
中科院分区:
计算机科学1区
文献类型:
--
作者:
Sun Hongguang;Wildemeersch Matthias;Sheng Min;Quek Tony Q. S.

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在过去十年中,上行(UL)和下行(DL)移动数据流量的增长具有明显的不对称性和时间变化特征。动态时分双工(Dynamic time-division duplex, TDD)通过调整UL/DL配置来适应当前的流量需求,从而能够适应流量的不对称性。在这项工作中,我们研究了一个双层异构蜂窝网络(HCN),其中宏层和小蜂窝层根据正交频带上的动态TDD方案运行。为了卸载网络基础设施,附近的移动用户可以参与设备到设备(D2D)通信,其活动由载波传感多址(CSMA)方案决定,以保护正在进行的基于基础设施和D2D传输。我们提出了一个基于负载感知覆盖概率和网络吞吐量来评估网络性能的分析框架。所提出的框架允许对最重要的TDD系统参数(如UL/DL配置、基站密度和偏置因子)对覆盖概率的影响进行量化。此外,我们还评估了带宽划分和D2D网络接入方案如何影响总网络吞吐量。通过研究覆盖概率与D2D用户活跃度之间的权衡,为D2D网络接入的优化设计提供指导。
Over the last decade, the growing amount of uplink (UL) and downlink (DL) mobile data traffic has been characterized by substantial asymmetry and time variations. Dynamic time-division duplex (TDD) has the capability to accommodate to the traffic asymmetry by adapting the UL/DL configuration to the current traffic demands. In this work, we study a two-tier heterogeneous cellular network (HCN) where the macro tier and small cell tier operate according to a dynamic TDD scheme on orthogonal frequency bands. To offload the network infrastructure, mobile users in proximity can engage in device-to-device (D2D) communications, whose activity is determined by a carrier sensing multiple access (CSMA) scheme to protect the ongoing infrastructure-based and D2D transmissions. We present an analytical framework for evaluating the network performance in terms of load-aware coverage probability and network throughput. The proposed framework allows quantification of the effect on the coverage probability of the most important TDD system parameters, such as the UL/DL configuration, the base station density, and the bias factor. In addition, we evaluate how the bandwidth partition and the D2D network access scheme affect the total network throughput. Through the study of the tradeoff between coverage probability and D2D user activity, we provide guidelines for the optimal design of D2D network access.
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