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arXiv 1408.7004cs.ITmath.IT
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QoS约束下异构网络的能量感知竞争功率分配

Energy-Aware Competitive Power Allocation for Heterogeneous Networks Under QoS Constraints

Giacomo Bacci, E. Veronica Belmega, Panayotis Mertikopoulos, Luca Sanguinetti

摘要:

提出了一种基于正交频分多址接入(OFDMA)的异构网络(HetNet)上行链路能量效率最大化的分布式功率分配方案。网络中的用户设备(UE)被建模为参与非合作博弈的理性代理,其中每个UE在所分配的子载波的集合上分配其可用的发射功率,以便在最小速率约束的条件下最大化其个体效用(定义为每瓦特发射功率的用户吞吐量)。在这个框架中,相关的解决方案的概念是德布鲁均衡,一个广义的纳什均衡占的情况下,代理人的一套可能的行动取决于其对手的行动。由于手头的问题可能不可行,德布鲁均衡并不总是存在。然而,使用分数规划的技术,我们提供了一个表征的均衡功率分配配置文件时,他们确实存在。特别是,德布鲁平衡被发现是一个注水的最佳响应运营商的水位是最小速率约束和电路功率的函数的不动点。此外,我们还描述了一组充分条件的存在性和唯一性的Debreu平衡利用最佳反应算子的收缩性质。这种分析提供了必要的工具,以获得一个功率分配方案,引导网络以迭代和分布式的方式达到平衡,而不需要任何集中处理。数值模拟,然后使用验证的分析和评估所提出的算法作为系统参数的函数的性能。

英文摘要:

This work proposes a distributed power allocation scheme for maximizing energy efficiency in the uplink of orthogonal frequency-division multiple access (OFDMA)-based heterogeneous networks (HetNets). The user equipment (UEs) in the network are modeled as rational agents that engage in a non-cooperative game where each UE allocates its available transmit power over the set of assigned subcarriers so as to maximize its individual utility (defined as the user's throughput per Watt of transmit power) subject to minimum-rate constraints. In this framework, the relevant solution concept is that of Debreu equilibrium, a generalization of Nash equilibrium which accounts for the case where an agent's set of possible actions depends on the actions of its opponents. Since the problem at hand might not be feasible, Debreu equilibria do not always exist. However, using techniques from fractional programming, we provide a characterization of equilibrial power allocation profiles when they do exist. In particular, Debreu equilibria are found to be the fixed points of a water-filling best response operator whose water level is a function of minimum rate constraints and circuit power. Moreover, we also describe a set of sufficient conditions for the existence and uniqueness of Debreu equilibria exploiting the contraction properties of the best response operator. This analysis provides the necessary tools to derive a power allocation scheme that steers the network to equilibrium in an iterative and distributed manner without the need for any centralized processing. Numerical simulations are then used to validate the analysis and assess the performance of the proposed algorithm as a function of the system parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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