Power Control and Channel Allocation for D2D Underlaid Cellular Networks
Power Control and Channel Allocation for D2D Underlaid Cellular Networks
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DOI：
10.1109/tcomm.2018.2812731
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发表时间：
2018-07-01
影响因子：
8.3
通讯作者：
Chehab, Ali
中科院分区：
文献类型：
--
作者：
Abdallah, Asmaa;Mansour, Mohammad M.;Chehab, Ali
作为蜂窝网络基础的设备到设备（D2D）通信是可行的网络技术，其可以潜在地增加频谱利用率并提高基于邻近的无线应用和服务的功率效率。然而，这种部署场景中的主要挑战是当与蜂窝用户共享相同资源时由D2D链路引起的干扰。在本文中，我们提出了一个信道分配（CA）计划连同一组三个功率控制（PC）计划，以减轻干扰的D2D底层蜂窝系统建模为一个随机网络，使用随机几何的数学工具。所提出的CA方案的新颖方面在于，它使得D2D链路能够与多个蜂窝用户共享资源，而不是如文献中先前考虑的那样。此外，伴随的分布式PC方案进一步管理链路建立和维护期间的干扰。前两种PC方案通过采用D2 D链路和基站的与距离相关的路径损耗参数（包括误差估计裕度）来补偿大规模路径损耗影响并最大化D2 D总速率。第三种方案是基于可变目标信号与干扰加噪声比的自适应PC方案，其限制了D2D用户引起的干扰并为蜂窝用户提供足够的覆盖概率。蜂窝链路的覆盖概率，D2D链路，和D2D链路的总速率的封闭形式的表达式推导出在分配的功率，D2D链路的密度，和路径损耗指数。这些关键系统参数对网络性能的影响进行了分析，并与以前的工作进行了比较。仿真结果表明，蜂窝和D2D覆盖概率的增强，以及频谱和功率效率的增加。
Device-to-Device (D2D) communications underlaying cellular networks is a viable network technology that can potentially increase spectral utilization and improve power efficiency for proximity-based wireless applications and services. However, a major challenge in such deployment scenarios is the interference caused by D2D links when sharing the same resources with cellular users. In this paper, we propose a channel allocation (CA) scheme together with a set of three power control (PC) schemes to mitigate interference in a D2D underlaid cellular system modeled as a random network using the mathematical tool of stochastic geometry. The novel aspect of the proposed CA scheme is that it enables D2D links to share resources with multiple cellular users as opposed to one as previously considered in the literature. Moreover, the accompanying distributed PC schemes further manage interference during link establishment and maintenance. The first two PC schemes compensate for large-scale path-loss effects and maximize the D2D sum rate by employing distance-dependent path-loss parameters of the D2D link and the base station, including an error estimation margin. The third scheme is an adaptive PC scheme based on a variable target signal-to-interference-plus-noise ratio, which limits the interference caused by D2D users and provides sufficient coverage probability for cellular users. Closed-form expressions for the coverage probability of cellular links, D2D links, and sum rate of D2D links are derived in terms of the allocated power, density of D2D links, and path-loss exponent. The impact of these key system parameters on network performance is analyzed and compared with previous work. Simulation results demonstrate an enhancement in cellular and D2D coverage probabilities, and an increase in spectral and power efficiency.