D2D resource allocation method based on uplink and downlink spectrum joint multiplexing

Abstract

The invention discloses a D2D resource allocation method based on uplink and downlink spectrum joint multiplexing, and belongs to the technical field of wireless communication. The method comprises the following steps: firstly, modeling D2D channel allocation variables and related constraint conditions; modeling the transmission rates of the D2D user and the cellular user in the multiplexing moderespectively, and constructing a D2D resource allocation problem into a mixed integer nonlinear programming problem phi by taking maximization of the throughput of the D2D network as a target; decomposing the problem phi into a power allocation problem phi 1 and a channel allocation problem phi 2; converting a problem phi 1 into a convex optimization problem by utilizing a Lagrange duality theory;and substituting the solution of the problem phi 1 into phi to obtain a problem phi 2, converting the problem phi 2 into a bipartite graph maximum weight matching problem, and then solving by utilizing a Hopcroft-Karp algorithm until optimal channel resource allocation of all D2D users is realized, thereby realizing maximization of D2D network throughput.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a D2D resource allocation method based on joint multiplexing of uplink and downlink spectrum. Background technique [0002] The popularity of smart terminals and the vigorous development of mobile 5G networks have promoted the development of mobile multimedia services, such as online live broadcast, interactive online games, etc. These services play a very important role in people's daily life. However, the operation of these multimedia services requires a large amount of spectrum resources for support, which brings great challenges to base stations with limited spectrum resources. In order to solve the contradiction between multimedia services that require spectrum resources and base stations that are short of spectrum resources, D2D spectrum sharing technology (device-to-device spectrum sharing technology), that is, D2D users can choose to share the s...

AI Technical Summary

Problems solved by technology

The first type of research proposes to reuse the uplink resources of cellular users. Most of these studies use game theory or auction mechanism to determine the transmission power between cellular users and D2D users, but they do not consider the impact of shared spectrum resources on cellular users. The impact of communication quality (Li Y, Jinn D, Yuan J, et al. Coalitional games for resource allocation in the device-to-device uplink undelaying cellular networks [J]. IEEE Transactions on wireless communications, 2014,13(7):3965- 3977.)

The second type of research proposes to reuse the downlink resources of cellular users, allowing D2D users to reuse the downlink spectrum resources of multiple cellular users or microcellular users, and proposes corresponding improved algorithms for channel selection, but does not consider the impact of user power on The impact of system throughput does not maximize the throughput of the network

The third type of research proposes to jointly reuse the uplink and downlink resources of cellular users, but only allows each pair of D2D users to jointly reuse the uplink and downlink spectrum resources of a single cellular user, which cannot make full use of the spectrum resources in the system

[0005] (1) Most studies on D2D resource allocation only consider a single spectrum multiplexing method, and do not consider joint multiplexing of uplink and downlink spectrum

[0006] (2) Most studies only allow each pair of D2D users to reuse the spectrum resources of a single cellular user

[0007] (3) Many studies only roughly considered the influence of D2D user power on D2D network throughput, and did not consider the influence of cellular user transmission power on it

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