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Distributed and QoS-driven cell association in HetNets to minimize global outage probability

机译:HetNets中的分布式和QoS驱动的信元关联,以最大程度地降低全局中断概率

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This paper addresses the cell association problem in the downlink of a multi-tier heterogeneous network (HetNet), where base stations (BSs) have finite number of resource blocks (RBs) available to distribute among their associated users. We define the global outage probability as the event where at least one user in the network experiences outage. An optimization problem is defined to minimize this global outage probability while maintaining quality of service (QoS) through two phases: Cell association phase followed by the optional RB distribution phase. The cell association problem is an NP-hard problem. We transform the cell association problem into a linear program, for which we propose a distributed cell association algorithm by using Lagrange dual decomposition method. An admission control scheme is also proposed to address the infeasibility problem and achieve load balancing. Finally, the effectiveness of our proposed distributed algorithm is examined through numerical simulations.
机译:本文解决了多层异构网络(HetNet)下行链路中的小区关联问题,其中基站(BS)具有有限数量的资源块(RB)可用于在关联用户之间进行分配。我们将全局中断概率定义为网络中至少一个用户发生中断的事件。定义了一个优化问题,以通过以下两个阶段在保持服务质量(QoS)的同时最小化此全局中断概率:小区关联阶段,其后是可选的RB分发阶段。小区关联问题是NP难问题。我们将细胞关联问题转化为线性程序,为此,我们使用拉格朗日对偶分解方法提出了一种分布式细胞关联算法。还提出了一种准入控制方案来解决不可行问题并实现负载平衡。最后,通过数值模拟验证了我们提出的分布式算法的有效性。

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