D2D Random Buffer Layout Method for Different User Preferences

Abstract

The invention discloses a D2D random cache deployment method oriented to different user preferences. The method does not require the content cache user to know the global information of the network, and can complete the content cache layout with the assistance of the content request user. Firstly, all content cache users broadcast their geographic locations, and multiple content request groups with different user preferences each obtain a caching demand plan with the optimal local benefit for the group and send it to the content cache users. The content cache user determines the unit cache price charged to the content request team according to the relationship between the sum of the cache demand and the cache capacity; the content request team recalculates the cache demand after considering the cache cost and gives back to the content cache user. When the total cache demand received by the content cache user is equal to the cache capacity, the content cache user performs content cache according to the cache demand. The method of the invention is close to the actual system, has better performance, and can be implemented in a semi-distributed manner.

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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