D2D communication resource allocation method for improving graph coloring

Abstract

The invention relates to a D2D communication resource allocation method for improving graph coloring, and the method comprises the following steps: S1, calculating the signal-to-interference-and-noiseratio of cellular users and D2D users; S2, calculating a safety distance di between D2D users; S3, determining a D2D user set of which the D2D users can share the same channel; S4, constructing a D2Duser multiplexing relation graph; S5, grouping the D2D users according to an improved graph coloring principle in combination with accumulated interference among the D2D users; and S6, allocating channel resources to each multiplexing group by using a Hungary algorithm; According to the method, the throughput of the cellular system and the access rate of the D2D users are improved, the resource utilization rate is effectively optimized, the interference between the D2D users can be reduced, and the service quality of D2D communication is ensured.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a device-to-device (D2D) communication resource allocation method, in particular to a device-to-device (D2D) communication resource with improved graph coloring Allocation method. Background technique [0002] With the rapid development of 5G mobile communications and network data services, large-scale smart terminals are constantly emerging, and wireless spectrum resources are becoming increasingly tight. The lack of spectrum resources has become a restrictive factor for the future development of wireless communications. In order to improve the communication quality of users, solve the problem of insufficient spectrum resources, and at the same time improve the throughput and access rate of mobile cellular systems, Device-to-Device (D2D) communication has been proposed. D2D communication technology allows adjacent mobile terminals to use operator-licensed spectrum ...

AI Technical Summary

Problems solved by technology

However, when D2D communication is introduced into the cellular network, the multiplexing of cellular user channels will cause serious interference, resulting in system performance degradation and affecting the battery life of user equipment. Therefore, the problem of D2D resource allocation has aroused widespread concern in the society.

[0003]Currently, D2D users and cellular users uplink resources are reused, thus greatly improving network spectrum utilization, but at the same time, it will also cause serious interference between network layers , with the further growth of user terminals, there will inevitably be a network scenario where the number of D2D users is greater than that of cellular users, which will cause a shortage of D2D user spectrum resources. Traditional resource allocation methods cannot effectively solve the shortage of D2D user spectrum resources and serious user interference. problem, this is the deficiencies of the prior art

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