低功耗设备对设备(D2D)通信的联合模式选择和功率分配方案

Minchae Jung, Kyuho Hwang, Sooyong Choi
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引用次数: 190

摘要

本文提出了一种低功耗的设备对设备(D2D)通信系统模式选择和功率分配方案,作为与蜂窝网络共存的基础。该方案是基于对系统中所有器件的模态指数组成的器件的所有可能模态组合的穷举搜索来执行的。具体来说,建议的方案包括两个步骤。首先,我们计算了每个器件所有可能模式的最优功率和最大功率效率。由于功率效率不是传输功率的凹函数,我们利用功率效率下界和上界的凹性得到次优解。通过第一步的次优功率分配获得每个器件所有可能模式的功率效率。在第二步中,我们根据第一步中获得的功率效率,在所有可能的器件模式组合中选择具有最大功率效率的模式序列。然后共同得到次优传输功率和功率效率最大化的模式。所提出的功率分配和模式选择的次优方案在功率效率方面接近上界。仿真结果表明,该方案在功率效率和系统容量方面都优于传统方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Joint Mode Selection and Power Allocation Scheme for Power-Efficient Device-to-Device (D2D) Communication
This paper proposes a power-efficient mode selection and power allocation scheme in device-to-device (D2D) communication system as an underlay coexistence with cellular networks. The proposed scheme is performed based on the exhaustive search of all possible mode combinations of the devices which consist of the mode indices for all devices in the system. Specifically, the proposed scheme consists of two steps. First, we calculate the optimal power with respect to the maximum power-efficiency for all possible modes of each device. Since the power-efficiency is not a concave function for the transmission power, we obtain the suboptimal solution by using the concavity of the lower and upper bound for the power-efficiency. The powerefficiencies for all possible modes of each device are obtained by the suboptimal power allocation in the first step. In the second step, we select a mode sequence which has the maximal power-efficiency among all possible mode combinations of the devices based on the obtained power-efficiencies in the first step. Then we can jointly obtain the suboptimal transmission power and the mode maximizing the power-efficiency. The proposed suboptimal scheme for the power allocation and mode selection performs close to the upper bound with respect to the power-efficiency. The simulation results also show that the proposed scheme outperforms the conventional schemes with respect to the power-efficiency and system capacity.
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