D2D random caching layout method oriented to different user preferences

Abstract

The invention discloses a D2D (Device-to-Device) random caching layout method oriented to different user preferences. Through adoption of the D2D random caching layout method, a content caching user can complete caching layout of contents with the assist of a content request user without network global information. The D2D random caching layout method comprises the steps that: geographical positions of all content caching users are broadcast by the content caching users; a caching requirement scheme achieving the optimal local benefit of own group is respectively obtained by a plurality of content request groups having different user preferences, then the caching requirement schemes are transmitted to the content caching users; a caching unit price collected from the content request groupsis determined by the each content caching user according to a relationship between a caching requirement summation and a caching capacity; caching requirement is re-calculated by the each content request group after consideration of a caching price, and the re-calculated caching requirement is fed back to the content caching users; and content caching is performed by the content caching user according to the caching requirement when the caching requirement summation received by the content caching user is equal to the caching capacity. The D2D random caching layout method of the invention hasthe beneficial effects of closing to a real system, good performance, and capacity for being achieved in a semi-distributed way.

Description

technical field [0001] The invention belongs to the technical field of cache-based D2D content distribution, and relates to a D2D random cache layout method for different user preferences. Background technique [0002] In recent years, mobile data services have grown explosively, and limited cellular spectrum resources cannot meet the growing urgent needs of mobile users for ultra-reliable and low-latency connections, such as high-definition video and online online games. Device-to-Device (D2D) communication allows geographically adjacent communication terminals to communicate directly without going through the base station, which significantly improves the utilization efficiency of the system spectrum and becomes one of the technologies to effectively unload the pressure on the cellular network. In addition, edge caching technology (Edge Caching, including base station caching, small cell base station caching, mobile user terminal caching, etc.) caches popular content with ...

AI Technical Summary

Problems solved by technology

However, in actual communication, wireless signals carrying content information are inevitably affected by interference and channel fading in wireless channels during transmission, which has a non-negligible impact on whether the receiver can successfully decode useful information

In addition, the original intention of the D2D caching technology is to offload the pressure on the cellular network, but the centralized search for global information, optimization of the cache deployment scheme, and control of the completion of D2D content distribution itself generate a large amount of signaling overhead; coupled with the uncertain location of mobile users Due to the differences in nature, user preferences, and the characteristics of the two dynamically changing over time, the centralized cache layout can be optimized, but it brings huge signaling overhead to the cellular base station, which violates the original intention of the D2D cache technology.

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