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arXiv 1405.2013cs.NImath.PR
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蜂窝网络中基于认知和能量收集的D2D通信:随机几何建模与分析

Cognitive and Energy Harvesting-Based D2D Communication in Cellular Networks: Stochastic Geometry Modeling and Analysis

Ahmed Hamdi Sakr, Ekram Hossain

摘要:

虽然认知无线电实现了频谱高效的无线通信,但从环境干扰中收集射频(RF)能量是实现能量高效的无线通信的使能器。在本文中,我们建模和分析认知和能量收集为基础的D2 D通信蜂窝网络。认知D2 D发射机从环境干扰中获取能量,并使用分配给蜂窝用户的信道之一(在上行链路或下行链路中)(其被称为D2 D信道)来与相应的接收机通信。本文研究了两种用于蜂窝通信上下行链路的频谱接入策略,即随机频谱接入(RSA)策略和优先频谱接入(PSA)策略。在RSA中,可以随机地选择包括由D2 D发射机使用的信道的任何可用信道用于蜂窝通信,而在PSA中,仅当所有其他信道被占用时才使用D2 D信道。只有当D2 D发射机收获足够的能量来执行朝向接收机的信道反转、D2 D信道空闲并且接收机处的$\mathsf{SINR}$高于所需阈值时,D2 D发射机才可以与其接收机成功通信;否则,D2 D通信发生中断。我们使用随机几何工具来评估所提出的通信系统模型的性能,一般路径损耗指数的中断概率D2 D和蜂窝用户。我们表明,能量收集可以是一个可靠的替代功率认知D2 D发射机,同时实现可接受的性能。在与非认知情况相同的$\mathsf{SINR}$中断要求下,对于两种频谱接入策略,认知信道接入提高了D2 D用户的中断概率。

英文摘要:

While cognitive radio enables spectrum-efficient wireless communication, radio frequency (RF) energy harvesting from ambient interference is an enabler for energy-efficient wireless communication. In this paper, we model and analyze cognitive and energy harvesting-based D2D communication in cellular networks. The cognitive D2D transmitters harvest energy from ambient interference and use one of the channels allocated to cellular users (in uplink or downlink), which is referred to as the D2D channel, to communicate with the corresponding receivers. We investigate two spectrum access policies for cellular communication in the uplink or downlink, namely, random spectrum access (RSA) policy and prioritized spectrum access (PSA) policy. In RSA, any of the available channels including the channel used by the D2D transmitters can be selected randomly for cellular communication, while in PSA the D2D channel is used only when all of the other channels are occupied. A D2D transmitter can communicate successfully with its receiver only when it harvests enough energy to perform channel inversion toward the receiver, the D2D channel is free, and the $\mathsf{SINR}$ at the receiver is above the required threshold; otherwise, an outage occurs for the D2D communication. We use tools from stochastic geometry to evaluate the performance of the proposed communication system model with general path-loss exponent in terms of outage probability for D2D and cellular users. We show that energy harvesting can be a reliable alternative to power cognitive D2D transmitters while achieving acceptable performance. Under the same $\mathsf{SINR}$ outage requirements as for the non-cognitive case, cognitive channel access improves the outage probability for D2D users for both the spectrum access policies.

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