关键词: 低轨卫星网络, 信息中心网络, 虚拟坐标系, 缓存节点部署, 电网应急场景

Abstract: In the swiftly advancing domain of satellite communication networks,a significant challenge arises concerning the efficient distribution of massive content volumes and optimal resource utilization.To tackle this issue,an in-network caching solution grounded in ICN has been proposed,in order to improve the immediacy and efficiency of content retrieval.Despite these advancements,low-earth orbit(LEO)satellites face constraints due to their limited onboard storage capabilities and energy consumption,making traditional caching strategies suboptimal.This paper introduces an innovative deployment methodology for cache nodes within LEO satellites using virtual coordinates.The approach begins by assessing real-world demand,segmenting service areas according to the density of content requests from terrestrial users.This segmentation enables the precise identification of caching demand hotspots.To simplify the intricate spatial relationships involved,a hierarchical mapping technique is utilized,translating these complexities into a more manageable mathematical framework.Building upon this foundation,a weighted clustering algorithm is then applied to refine the placement of cache nodes,thereby optimizing the allocation of caching resources across the sa-tellite network.Empirical evaluations affirm that this method not only significantly decreases user content acquisition latency but also achieves an energy consumption reduction exceeding 15%.These enhancements underscore the potential of this strategy to elevate the operational performance of the system.In critical scenarios,such as power grid emergencies,the pre-positioning of essential emergency data facilitates swift command dissemination and repair coordination amid communication disruptions,bolstering the reliability of power supply maintenance.Consequently,this approach not only aids in expediting societal stabilization efforts but also heralds extensive application prospects.For example,in the event of a power grid failure,pre-stored emergency instructions can expedite recovery operations,thereby mitigating broader societal impacts.Additionally,the enhanced content accessibility coupled with lower energy expenditure positions this strategy as a pivotal advancement in the realm of satellite communication networks.

Key words: Low orbit satellite network, Information center network, Virtual coordinate system, Cache node deployment, Grid emergency scenarios