能量高效超密集网络的最优部署

doi:10.11959/j.issn.1000-0801.2017068

摘要/Abstract

摘要：

为使能量效率最大化，采用随机几何方法对多小区多用户MIMO蜂窝网络的上行链路进行建模，改进系统功耗模型，得到一个关于基站密度、发送信号功率、基站天线数、小区用户数以及导频复用因子的能量效率最大化问题。求解该问题，可得到最优的网络部署方案以及各最优参数与硬件特性、传播环境之间的关系。仿真与数值计算结果显示，超密集网络部署可以显著提高能量效率，但是随着基站密度的进一步增加，能量效率的提升很快饱和。更有趣的是，能量效率最优化所确定的部署方案恰为大规模MIMO情形。

关键词: 能量效率, 超密集网络, 大规模MIMO, 多用户MIMO, 上行链路

Abstract:

In order to maximize energy efficiency, the stochastic geometry method was used to model the uplink of a multi-cell multi-user MIMO cellular network.Then the system power consumption model was ameliorated.Based on this,an energy efficiency maximization problem with respect to base station density,transmit power,the number of base station antennas,users per cell and pilot reuse factor was obtained.Solving the problem,the optimal network deployment,as well as the relationship between the optimal variables,hardware characteristics and propagation environment was obtained.Finally, simulation and numerical results show that the ultra-dense network deployment can significantly improve the energy efficiency.However,with the further increase of the density of the base station,the improvement of the energy efficiency was quickly saturated.More interestingly,the deployment scenario determined by the energy efficiency optimization was just massive MIMO scenarios.

Key words: energy efficiency, ultra-dense network, massive MIMO, multi-user MIMO, uplink

中图分类号:

TN929.5

葛亮,王志旭. 能量高效超密集网络的最优部署[J]. 电信科学, 2017, 33(3): 44-51.

Liang GE,Zhixu WANG. Optimal deployment of energy-efficient ultra-dense network[J]. Telecommunications Science, 2017, 33(3): 44-51.

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参数	符号	数值
相干资源块长度/符号	S	400
路径衰落指数	α	3.76
1 km处衰落/dB	ω	130
功放效率	η	0.39
硬件失真等级	ε	0.05
符号时间/（s·符号^-1）	τ	0.5×10⁷
编码/解码/回程/（J·bit^-1）	A	1.15×10^-9
静态功耗/（J·符号^-1）	C₀	20 W×τ
单用户电路功耗/（J·符号^-1）	C₁	0.1 W×τ
单基站天线电路/（J·符号^-1）	D₀	0.5 W×τ
信号处理系数/（J·符号^-1）	D₁	1.56×10^-10
噪声方差/（J·符号^-1）	σ²	10^-20