Resource allocation method based on SCMA (SubCarrier Multiple Access) mechanism

Abstract

The invention discloses a resource allocation method based on an SCMA (SubCarrier Multiple Access) mechanism, and mainly solves the problems that in the prior art, the spectrum resource utilization rate, systematicness and a speed are low and communication users multiplex spectrum resources to cause serious interference. The invention adopts the implementation scheme that 1, a mode selection value of each user is calculated; 2, spectrum resources are selected for the user with the minimum mode selection value so as to enable the user to have the maximum signal-to-noise ratio, and SCMA codebooks are determined; 3, a base station constructs a conflict graph, and a candidate color set of each vertex in the conflict graph is determined; 4, an associated value of each vertex in the conflict graph is calculated; 5, one color is selected to construct a subgraph, the vertex with the minimum associated value is selected, a signal-to-interference and noise ratio of the vertex to a matched vertex is calculated; and 6, the vertexes in the conflict graph are colored to complete resource allocation. Compared with a conventional resource allocation method, the resource allocation method disclosed by the invention has the advantages of high system user capacity, high spectrum efficiency and high systematicness and speed, and can be used for honeycomb and D2D (Device-to-Device) heterogeneous networks.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a joint optimization method for mode selection and spectrum resource allocation based on sparse code division multiple access mechanism SCMA, which can be used in cellular and D2D heterogeneous networks. Background technique [0002] With the rapid growth of wireless terminal equipment and people's requirements for high-capacity and high-speed transmission network systems, especially in the upcoming 5G network with higher user density and faster transmission rates, user equipment needs more spectrum resources. The contradiction between the needs of the market and the current limited spectrum resources is more obvious. Therefore, it is necessary to continuously develop new wireless communication technologies, among which the introduction of end-to-end D2D communication technologies in cellular networks has become an emerging development trend. D2D commu...

AI Technical Summary

Problems solved by technology

This single consideration of sharing spectrum resources between a pair of D2D communication users and a cellular user can only improve spectrum efficiency to a limited extent, and cannot fully explore the potential of spectrum reuse gains.

[0006] (2) The traditional heterogeneous network does not select the appropriate communication mode for communication users, such as cellular mode, D2D dedicated mode, D2D multiplexing mode

[0007] (3) Traditional heterogeneous networks mostly use the OFDMA access mechanism, but it cannot well adapt to the upcoming 5G network with high user density and high transmission rate, and cannot make full use of the limited spectrum resource

[0008] The above defects make the existing network system have many imperfections, greatly reduce the resource multiplexing gain, make full use of limited spectrum resources, and affect the improvement of user capacity and system and rate

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