Abstract
With the emergence of 5G mobile multimedia services, end users’ demand for high-speed, low-latency mobile communication network access is increasing. Among them, the device-to-device (D2D) communication is one of the considerable technology. In D2D communication, the data does not need to be relayed and forwarded by the base station, but under the control of the base station, a direct local link is allowed between two adjacent mobile devices. This flexible communication mode reduces the processing bottlenecks and coverage blind spots of the base station, and can be widely used in dense user communication scenarios such as heterogeneous ultra-dense wireless networks. One of the important factors which affects the quality-of-service (QoS) of D2D communications is co-channel interference. In order to solve this problem of co-channel interference, this paper proposes a graph coloring based algorithm. The main idea is to utilize the weighted priority of spectrum resources and enables multiple D2D users to reuse the single cellular user resource. The proposed algorithm also provides simpler power control. The heterogeneous pattern of interference is determined using different types of interferences and UE and the priority of color is acquired. Simulation results show that the proposed algorithm effectively reduced the co-channel interference, power consumption and improved the system throughput as compared with existing algorithms.
Highlights
With the rapid proliferation in emerging wireless technologies, the sixth-generation (6G) is considered as one of the most potential candidate which will fulfill the requirements for the future heterogeneous networks [1]
In order to evaluate the impact of the D2D wireless resource allocation algorithm proposed in this paper on system performance, MATLAB simulation is used for verification and analysis
Users are uniformly distributed in the cell, cellular users are distributed within 200 m of the center of the base station, and D2D users reuse cellular user downlink resources
Summary
With the rapid proliferation in emerging wireless technologies, the sixth-generation (6G) is considered as one of the most potential candidate which will fulfill the requirements for the future heterogeneous networks [1]. How to suppress co-channel interference by allocating wireless resources for D2D users has important practical significance and research value for improving spectrum utilization and meeting users’ high-speed data transmission requirements [17,18,19,20]. The authors in [32] establishes a weighted bipartite graph between D2D users and cellular users, and uses the optimal matching algorithm to allocate wireless resources, which improves the system throughput, but the algorithm complexity is relatively high. Considering the above-mentioned problems, this article proposes a graph-based coloring method for D2D users when multiplexing the downlink of cellular users in the LTE system to communicate, especially in scenarios where communication quality and transmission speed are required in social networks. Combined with the algorithm simulations, we compared and analyze the advantages of the proposed algorithm over other similar algorithms
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