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Joint resource allocation and user association in downlink three-tier heterogeneous networks

机译：下行三层异构网络中的联合资源分配和用户关联

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摘要

We investigate a joint user association and resource allocation problem in a three-tier heterogeneous network. Orthogonal resource allocation among different tiers is assumed. The problem is formulated as minimizing the total resources required to satisfy given user traffic demands. We first examine the structure of the optimal solution for this convex optimization problem and show that the optimal user association and hence resource allocation is determined by a bias value on the data rate offered by each base station. We then develop distributed algorithms based on the dual ascent method in determining the optimal rate bias for each BS. Numerical experiments demonstrate that the developed algorithms converge fast and produce close-to-optimal solutions. It is also shown that under cross-tier orthogonal resource allocation, the three-tier deployment provides significant performance improvement over a two-tier deployment, using the same set of base stations in each case.
机译：我们调查三层异构网络中的联合用户关联和资源分配问题。假设不同层之间的正交资源分配。该问题被表述为使满足给定用户流量需求所需的总资源最小化。我们首先检查此凸优化问题的最优解决方案的结构，并表明最优用户关联和资源分配是由每个基站提供的数据速率上的偏差值确定的。然后，我们在确定每个BS的最佳速率偏差的基础上，开发了基于双重上升方法的分布式算法。数值实验表明，所开发的算法收敛迅速，并产生接近最佳的解决方案。还表明，在跨层正交资源分配下，三层部署在两层部署上提供了显着的性能提升，在每种情况下都使用相同的基站集。

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