Method for supporting D2D-cellular heterogeneous network joint user association and content cache

Abstract

The invention relates to a method for supporting D2D cellular heterogeneous network joint user association and content cache, and belongs to the technical field of wireless communication. The method comprises the following steps: S1 modeling a user content requirement identifier; S2 modeling a user association variable; S3 modeling a user content cache variable; S4 modeling a user data transmission rate; S5 modeling a user total transmission delay; S6 modeling a user D2D mode transmission delay; S7 modeling a user small cell base station association mode transmission delay; S8 modeling a usermacro cell base station association mode transmission delay; S9 modeling joint user association and content cache restriction conditions; and S10 determining a user association mode and a content cache optimization strategy based on the minimum user total transmission delay. By adoption of the method provided by the invention, the optimal user association network strategy, the optimal content placement and the minimum user content total transmission delay are achieved on the premise of effectively ensuring the minimum data rate requirement of each user.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for supporting D2D-cellular heterogeneous network joint user association and content caching. Background technique [0002] In recent years, with the rapid development of technologies such as mobile Internet and smart terminals, wireless services have grown explosively. Traditional cellular network technology has been difficult to effectively cope with the rapidly growing demand for mobile services. Therefore, it is urgent to study new technologies to meet user needs. Quality of service requirements, improve network performance. Device-to-Device technology can well support local services with a large amount of data in the future network by realizing direct communication between user terminals without base station forwarding. The introduction of D2D communication technology in the cellular network can effectively reduce terminal power consumption and network...

AI Technical Summary

Problems solved by technology

[0004] Existing papers have carried out research on the problem of user association in cellular D2D networks, such as proposing a user association model based on network throughput optimization or maximizing the total revenue of mobile network operators; Cache hit rate maximization or schemes based on cache overhead optimization, but existing research rarely considers end-to-end transmission delay optimization, resulting in limited user transmission performance; in addition, few studies jointly consider user association and content caching strategies, It is difficult for the proposed algorithm to achieve network performance optimization

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