Cellular heterogeneous network joint user association, content cache and resource allocation method based on base station cooperation

Abstract

The invention relates to a cellular heterogeneous network joint user association, content cache and resource allocation method based on base station cooperation, and belongs to the technical field ofwireless communication. In a cellular heterogeneous network based on base station cooperation, a request user can select three association modes, namely, a macro cellular base station association mode, a small cellular base station direct association mode and an SBS association mode based on base station cooperation. It is assumed that the SBS has certain caching capability and the adjacent SBSs can cooperate with each other to implement cached content forwarding, and a user association, content cache and resource allocation strategy is optimized and determined by using the minimization of a network cost function as the target. The method comprises the following steps: S1: modeling a user content requirement identifier; S2: modeling a user association variable; S3: modeling an SBS contentcache variable; S4: modeling a user data transmission rate; S5: modeling a network cost function; S6: modeling an MBS association mode transmission delay; S7: modeling an SBS direct association mode transmission delay; S8: modeling an SBS association mode transmission delay based on base station cooperation; S9: modeling an MBS backhaul cost; S10: modeling joint user association, content cache andresource allocation limiting conditions; and S11: based on the minimization of the network cost function, determining the user association, content cache and resource allocation strategy.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a cellular heterogeneous network joint user association, content cache and resource allocation method based on base station cooperation. Background technique [0002] With the rapid development of wireless communication technology, the traditional cellular network architecture has been unable to cope with explosive growth, a wide variety of mobile terminal service requirements, and spectrum resources shortage. The cellular heterogeneous network can provide users with higher transmission quality by deploying small base stations (Small Base Stations, SBSs) of low-power nodes, such as pico base stations, femto base stations, and relay nodes, in traditional macro cells. Communication links, and can effectively improve spectrum efficiency. [0003] As an emerging technology, content caching pre-caches hot content frequently requested by network users at access network no...

AI Technical Summary

Problems solved by technology

However, the existing research rarely considers the joint user association, content caching and resource allocation optimization strategies of cellular heterogeneous networks supporting SBS cooperation, resulting in limited network performance.

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