Coding cache content placement and resource joint optimization method of space-air-ground integrated network

Abstract

The invention provides a coding cache content placement and resource joint optimization method for a space-air-ground integrated network, and the method comprises the steps: designing a coding cache strategy composed of content placement and coding transmission in a hierarchical heterogeneous network composed of a satellite, an unmanned plane and a vehicle user; based on the strategy, performing joint optimization on cache content placement, transmission power of the system and unmanned aerial vehicle deployment, so the minimization of energy overhead of the system is realized, and the problem of energy limitation of the space-air-ground integrated network is relieved. The invention has the beneficial effects that the multicast opportunity between a satellite node and a plurality of unmanned aerial vehicle cache nodes is considered for a layered heterogeneous space-air-ground integrated network, and the transmission data volume of a backhaul link is reduced by using a coding cache strategy, so the energy overhead of the system is reduced, the heterogeneity of different coverage areas of the network is considered, the cache content placement is optimized, and the network performance is improved. Meanwhile, system transmission power distribution and unmanned aerial vehicle deployment are jointly optimized.

Description

technical field [0001] The present invention relates to the field of information communication technology, and in particular to a coded cache content placement and resource joint optimization method for an air-space-ground integrated network. Background technique [0002] The Internet of Vehicles can provide information transmission services for road vehicle users, such as real-time information on road conditions and information for entertainment, etc., which greatly improves the driving experience of users. However, the communication infrastructure of the traditional Internet of Vehicles is generally ground communication facilities, such as base stations and roadside units. Such traditional terrestrial communication facilities have the disadvantage of insufficient coverage, especially in suburban or rural areas. The air-space-ground integrated network composed of geostationary satellites-UAVs-ground vehicles can solve the problem of insufficient coverage. [0003] However...

AI Technical Summary

Problems solved by technology

[0004] However, most of the current caching strategies are non-coding caching strategies that do not consider multicast opportunities

Moreover, due to the hierarchical heterogeneity of the space-ground integrated network, it is very challenging to design and implement a code caching strategy in the space-space-ground integrated network composed of satellite-drone-vehicle

At the same time, many mobile edge caching networks only consider content placement optimization without optimizing system resources.

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