Abstract
The satellite network with cache function becomes the future development trend. How to efficiently use the node cache of the satellite network has become a research hotspot. A theoretical problem that needs to be solved in the latest research on effective utilization of cache is the estimation of cache occupancy. Based on the martingale encapsulation theory, combined with the channel conditions, access protocols, and queuing strategies in the satellite storage network, a satellite node occupancy estimation method and theoretical bounds are proposed in a two-layer satellite network of GEO and LEO. The accuracy of the martingale encapsulation method in estimating the cache occupancy is estimated by simulations. The simulation results show that our method is precise. The cache occupancy estimation method we proposed provides a theoretical basis for the optimal allocation of satellite cache resources.
Highlights
A T present, the satellite storage network can be regarded as the further development of the satellite communication system, and use the information center network (ICN), the ground network, and the on-board cache [1]–[3] forms a multi-level, heterogeneous and three-dimensional storage network system
In order to verify the martingale encapsulation theory to estimate the cache occupancy, we use random burst data to pass through a random channel, and the cache backlog after the First In First Out (FIFO) queuing strategy is used as a box plot and the encapsulation function estimate is simulated and compared
Compared with the queuing theory, the proposed method does not assume that the data arrival obeys the Poisson distribution, which is in accordance with the actual cases because the general data
Summary
A T present, the satellite storage network can be regarded as the further development of the satellite communication system, and use the information center network (ICN), the ground network, and the on-board cache [1]–[3] forms a multi-level, heterogeneous and three-dimensional storage network system. The satellite storage structure at this stage is only a single-layer satellite network structure, and it uses high-orbit satellite broadcasting. This form of broadcasting is likely to cause infection of other users’ data. This paper proposes a method to estimate the remaining cache of nodes using martingale theory, which provides a theoretical basis for the future design of the content placement research of satellite storage network nodes
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