| 异构蜂窝网络中基于协作混合缓存的能耗分析 |
| Analysis on energy consumption based on cooperative hybrid caching in heterogeneous cellular networks |
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| DOI： |
| 中文关键词: 异构网络；协作；混合缓存；中断概率；能耗 |
| 英文关键词:heterogeneous network; cooperation; hybrid caching; outage probability; energy consumption |
| 基金项目:国家自然科学基金（61971239，92067201）和江苏省重点研发计划（BE2020084 4）资助项目 |
| 作者 | 单位 | | 张 骏 | 南京邮电大学 江苏省无线通信重点实验室，江苏 南京 210003；南京邮电大学 教育部泛在网络健康服务系统工程研究中心，江苏 南京 210003 | | 朱 琦 | 南京邮电大学 江苏省无线通信重点实验室，江苏 南京 210003；南京邮电大学 教育部泛在网络健康服务系统工程研究中心，江苏 南京 210003 |
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| 中文摘要: |
| 针对由宏基站和小基站组成的两层异构蜂窝网络缓存场景，设计了将混合缓存与基站之间的协作相结合的混合协作缓存机制。用户接入采用封闭式接入策略，将两层异构网络基站的分布建模为相互独立的PPP过程，基于随机几何理论，在宏基站和小基站使用正交频谱和共享频谱两种场景下，采用文件重传机制，分别推导了宏用户和小基站用户的无线传输中断概率，基于混合协作缓存机制推导了文件命中率，并在此基础上，进一步推导了服务用户的系统能耗。仿真结果表明，推导的理论值与仿真值基本一致，证明了推导的正确性；文中设计的缓存策略能够提高用户请求文件的命中率，减少系统的能耗。 |
| 英文摘要: |
| Combining hybrid caching with cooperation between base stations, we develop a hybrid cooperative caching scheme in the two layer heterogeneous cellular network that consists of macro and small base stations. The closed access policy is adopted for users and the distribution of base stations in each tier is modeled as an independent PPP in the heterogeneous network. Based on the stochastic geometry theory, we derive the outage probability of users wireless transmission under the co channel and the orthogonal channel scenarios. Then, we deduce the file cache hit probability based on the hybrid cooperative caching, and futher calculate the energy consumption, with content retransmission. Simulation results are are consistent with the analysis results, which demonstrate the correctness of our derivation. The proposed hybrid cooperative caching scheme can improve the cache hit probability of users requests, and save the energy consumption of the system. |
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