基于最大最小公平性的异构VLC/RF网络资源分配算法

Max-min fairness-based resource allocation algorithm for heterogeneous VLC/RF networks

为了充分挖掘可见光通信(visible light communication, VLC)和射频(radio frequency, RF)通信的优势,提出了一种室内混合VLC/RF异构无线网络传输模型。针对该模型,考虑用户最大最小公平性、网络带宽约束以及最大发射功率约束条件,以用户需求速率门限值作为资源分配的重要条件,提出了一种最大化最小用户传输速率的资源分配问题以提高用户公平性和提高网络的传输速率。通过引入辅助变量和连续凸近似方法,将原非凸问题转换为一个凸优化问题,利用拉格朗日对偶原理获得传输功率和带宽分配的解析解,并进行计算复杂度分析。仿真结果验证了该算法具有较快的收敛性和较高的传输速率。

In order to fully exploit the advantages of visible light communication(VLC) and radio frequency(RF) communication, this paper proposed an indoor hybrid VLC/RF heterogeneous wireless network transmission model. Based on this model, a max-min transmission rate optimization problem was formulated to improve user’s fairness and network transmission rate under the consideration of the bandwidth constraint, the maximum transmit power constraint, and the minimum rate constraint of the user. The original non-convex optimization problem was transformed into a convex one by using the auxiliary variable approach and successive convex approximation, where the analytical solutions of transmit power and bandwidth allocation were obtained by using the Lagrange dual approach. The computational complexity was also analyzed. Simulation results verified the effectiveness of the proposed algorithm in terms of convergence and rate improvement.