Heterogeneous Cellular Networks with Flexible Cell Association: A Comprehensive Downlink SINR Analysis

被引:934
作者
Jo, Han-Shin [1 ]
Sang, Young Jin [2 ]
Xia, Ping
Andrews, Jeffrey G. [3 ]
机构
[1] Hanbat Natl Univ, Dept Elect & Control Engn, Taejon, South Korea
[2] Yonsei Univ, Dept Elect & Elect Engn, Seoul 120749, South Korea
[3] Univ Texas Austin, Dept Elect & Comp Engn, WNCG, Austin, TX 78712 USA
基金
美国国家科学基金会;
关键词
Heterogeneous cellular network; cell association; SINR; stochastic geometry; STOCHASTIC GEOMETRY; FEMTOCELL NETWORKS; INTERFERENCE; UPLINK; ARCHITECTURE; COVERAGE;
D O I
10.1109/TWC.2012.081612.111361
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];
摘要
In this paper we develop a tractable framework for SINR analysis in downlink heterogeneous cellular networks (HCNs) with flexible cell association policies. The HCN is modeled as a multi-tier cellular network where each tier's base stations (BSs) are randomly located and have a particular transmit power, path loss exponent, spatial density, and bias towards admitting mobile users. For example, as compared to macrocells, picocells would usually have lower transmit power, higher path loss exponent (lower antennas), higher spatial density (many picocells per macrocell), and a positive bias so that macrocell users are actively encouraged to use the more lightly loaded picocells. In the present paper we implicitly assume all base stations have full queues; future work should relax this. For this model, we derive the outage probability of a typical user in the whole network or a certain tier, which is equivalently the downlink SINR cumulative distribution function. The results are accurate for all SINRs, and their expressions admit quite simple closed-forms in some plausible special cases. We also derive the average ergodic rate of the typical user, and the minimum average user throughput - the smallest value among the average user throughputs supported by one cell in each tier. We observe that neither the number of BSs or tiers changes the outage probability or average ergodic rate in an interference-limited full-loaded HCN with unbiased cell association (no biasing), and observe how biasing alters the various metrics.
引用
收藏
页码:3484 / 3495
页数:12
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