部分频率复用下的终端直通资源分配方案

终端直通(device-to-device,D2D)通信通过共享蜂窝资源可以提升频谱效率,但会产生同频干扰,导致系统吞吐量和用户的服务质量降低。针对在部分频率复用(fractional frequency reuse,FFR)蜂窝网络中多小区间的D2D链路和蜂窝链路的同频干扰问题,提出了基于优先级的资源分配方案。该方案通过对频率资源赋予不同的优先级对小区间干扰进行协调,尽量避免小区间的D2D链路和蜂窝链路间、以及D2D链路间的干扰,从而提升系统性能。仿真结果表明,基于优先级的资源分配方案改善了小区边缘用户的服务质量,提高了系统容量。

A Resource Allocation Scheme for D2D Communications Using Fractional Frequency Reuse

Device-to-device (D2D) communication can improve spectral efficiency by reusing licensed cellular frequency resources, but in the same time it will introduce inter-cell interference which results in the degradation of cell throughput and quality of service. A resource allocation scheme based on the priority is proposed in this paper to mitigate inter-cell interference in multicell uplink D2D communication underlying cellular system using fractional frequency reuse(FFR). The proposed scheme coordinates the interference from the neighboring cells (including the interference from both the cellular and D2D transmissions in the neighboring cells) by given different priority to frequency resources to enhance the performance of LTE system. The simulation results show that the proposed resource allocation scheme improves the service quality of the cell edge users and increases the system throughput.