面向天地一体化内容分发业务的网内缓存机制研究

doi:10.11959/j.issn.2096-8930.20200207

Abstract

Abstract:

In view of the problem of satellite mobility and terrestrial network resource constraints, a pre-placement strategy for terrestrial network content based on named data networking was proposed; Then, local content requests under the coverage of multiple base stations was fully considered.Based on the diff erence in distribution, a content distribution strategy based on fairness in satellite networks was proposed.The numerical results showed that the proposed content pre-placement strategy was eff ective in terms of satellite network content injection.In addition, in terms of satellite network content distribution, the proposed fair-based content distribution strategy could maximized content satisfaction.

Key words: space-integrated-ground information network, content delivery, named data networking, in-network caching

CLC Number:

TN393

Yang CAO, Yufeng ZHU, Junfeng LV, Tao JIANG, Peng GAO, Dongchen ZHANG. Research on In-Network Caching Mechanisms for Space-Integrated-Ground Content Delivery Service[J]. Space-Integrated-Ground Information Networks, 2020, 1(2): 48-56.

Figures/Tables 16

符号名	含义
$A ={1, \dots, A}$	地面站集合
$B ={1, \dots, B}$	卫星轨道集合
$C ={1, \dots, C}$	CS集合
$L ={1, \dots, L}$	NDN主干网链路集合
$CL=(1, \dots, I)$	全局内容列表
$Q_{i c} \in ℤ$	内容库c存储内容i的块数
$Q_{c} \in ℤ$	内容库c的容量
$p_{i} \in [0, 1]$	内容i被请求的概率
$m_{i} \in ℤ$	内容i的内容块数
$E_{a b}^{s p e} \in ℤ$	轨道b上的一颗卫星，从地面站a获取到的最大内容块数
$E_{l a b}^{l i n k} \in ℤ$	轨道b上的一颗卫星，从链路l经地面站a获取到的最大内容块数
$g_{l a b} ＞ 1$	轨道b上的一颗卫星，从链路l经地面站a获取到一个内容块的代价
$R_{i b} \in {0, 1}$	轨道b上的卫星是否能够获取到内容i
$U_{a b i} \in ℤ$	轨道b上的一颗卫星，直接从地面站a获取到内容i的块数
$U_{l a b i} \in ℤ$	轨道b上的一颗卫星，从链路l经地面站a获取到内容i的块数

References 9

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卫星参数描述	参数值
卫星轨道数量B/个	6
单轨道卫星数量S_b/颗	12
卫星最大窗口时间W/s	1 056.42
卫星轨道高度H/km	1 000

地面网络参数描述	参数值
地面站数量A/个	8
地面站发送范围的投影半径r/km	3 884.29
地面站发送带宽D^{s p e}/(Mbit·s^-1)	6
内容库数量C/块	14
NDN主干网链路数量L/个	14
NDN主干网链路带宽D^l/(Mbit·s^-1)	20
兴趣包和数据包转发处理时延τ/ms	0.5

内容参数描述	参数值
内容列表长度I/个	50
内容分布系数α	1
CS容量Q_c	1 000
内容i的内容块数m_i/块	1 000
内容块大小s_ck/byte	5 000

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Research on In-Network Caching Mechanisms for Space-Integrated-Ground Content Delivery Service

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