异构网络中两种边缘缓存策略的能耗分析

doi:10.11959/j.issn.1000-0801.2018035

电信科学 ›› 2018, Vol. 34 ›› Issue (1): 17-26.doi: 10.11959/j.issn.1000-0801.2018035

异构网络中两种边缘缓存策略的能耗分析

孙毅^1,²,王鸿^1,²,宋荣方^1,²

¹ 南京邮电大学通信与信息工程学院，江苏南京 210003
² 南京邮电大学江苏省通信与网络技术工程研究中心，江苏南京 210003

修回日期:2017-11-22 出版日期:2018-01-01 发布日期:2018-02-05
作者简介:孙毅（1992-），男，南京邮电大学硕士生，主要研究方向为异构网络与边缘缓存技术。|王鸿（1989?），男，博士，南京邮电大学通信与信息工程学院讲师，主要研究方向为蜂窝网络密集化、非正交波形、非正交接入、干扰对齐等。|宋荣方（1964-），男，南京邮电大学教授、博士生导师，主要研究方向为宽带无线通信理论与技术。
基金资助:
江苏省自然科学基金资助项目(BK20170910);南京邮电大学江苏省通信与网络技术工程研究中心开放课题

Analysis of energy consumption of two kinds of edge caching strategies in heterogeneous networks

Yi SUN^1,²,Hong WANG^1,²,Rongfang SONG^1,²

¹ College of Telecommunications ＆Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China
² Jiangsu Engineering Research Center of Communication and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China

Revised:2017-11-22 Online:2018-01-01 Published:2018-02-05
Supported by:
Natural Science Foundation of Jiangsu Province of China(BK20170910)

摘要/Abstract

摘要：

研究了两层异构网络在两种不同缓存策略下的能量消耗。首先，对支持缓存的异构网络能耗的各个组成部分分别进行了建模；其次，在一定中断概率条件下，推导了异构网络能量消耗与小基站分布密度、用户负载及缓存容量之间的关系表达式。仿真结果表明，边缘缓存技术的引入能够有效降低异构网络的能量消耗，而对于不同的小基站分布密度和用户负载，两种缓存策略的优劣性是不同的。两种缓存策略的总能耗和平均能耗分别随小基站分布密度和小基站用户负载的增加而降低。小基站的缓存容量也会对系统能量消耗产生不可忽视的影响。

关键词: 异构网络, 边缘缓存, 能量消耗, 齐次泊松点过程

Abstract:

The energy consumption of a two-tier heterogeneous network under two different caching strategies was analyzed.Firstly,the energy consumption of each network components was modelled,and the relationship between the energy consumption of heterogeneous networks and the distribution density of small cell,user load per cell and caching capacity was investigated.The simulation results show that edge caching can effectively reduce the energy consumption of heterogeneous networks and the performance of the two caching strategies are different under different density of small base station and user load.Specifically,the energy consumption of both the network and per user under the two caching strategies are reduced with the increase of the density of small base station and the user load per cell,respectively.Furthermore,the influence of small base station’s caching capacity can not be neglected in total energy consumption.

Key words: heterogeneous network, edge caching, energy consumption, homogeneous Poisson point process

中图分类号:

TN929.5

孙毅,王鸿,宋荣方. 异构网络中两种边缘缓存策略的能耗分析[J]. 电信科学, 2018, 34(1): 17-26.

Yi SUN,Hong WANG,Rongfang SONG. Analysis of energy consumption of two kinds of edge caching strategies in heterogeneous networks[J]. Telecommunications Science, 2018, 34(1): 17-26.

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参数	物理意义	取值
R_m	MBS服务半径/m	300
R_s	SBS服务半径/m	15
N_f	服务器中视频文件总数	20 000
N_m	MBS缓存大小	5 000
N_s	SBS缓存大小	1 000
P_m	MBS发送功率/W	20
P_s	SBS发送功率/W	0.1
N_a	加性高斯白噪声功率/dBm	110
Γ_s	SBS中断SINR阈值/dB	0
Γ_m	MBS中断SINR阈值/dB	0
v	文件流行分布成形系数	0.8
N_B	一个视频文件所包含的数据分组数	1 000
F	一个视频文件大小/bit	10⁷
α	衰减指数	4
e_m	MBS发送1 bit能耗/(J·bit^-1)	10^-8
e_s	SBS发送1 bit能耗/(J·bit^-1)	5×10^-10
e_ba	回传链路传输1 bit的能耗/(J·bit^-1)	10^-8
e_c	缓存器缓存1 bit能耗/(J·bit^-1)	10^-10
U	异构网络服务的总用户数	10 000
U_s	SBS用户负载	140

异构网络中两种边缘缓存策略的能耗分析

Analysis of energy consumption of two kinds of edge caching strategies in heterogeneous networks

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