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针对可见光通信(VLC)与WiFi组成的异构网络中的网络选择问题,现有工作大多仅关注实际物理网络指标的优化,如信干噪比(SINR)和吞吐量等,而忽视了终端用户的异构需求和服务体验。基于此,该文提出了一种以用户体验质量(QoE)为优化目标的网络切换算法。该算法首先基于平均主观评分(MOS)机制建立离散化的QoE等级模型,然后根据不同网络对应的实际QoE水平给出了相应网络切换准则,当且仅当新网络使得用户QoE等级提升时才进行网络切换,从而在一定程度减小盲目追求容量优化引起的网络切换开销。仿真结果表明,该算法相比现有算法能够在保证QoE水平的前提下显著减小整体的网络切换次数,从而降低网络开销,提升网络性能。
For the problem of network selection in heterogeneous networks composed of visible light communication (VLC) and WiFi, most of existing work only focuses on the optimization of real physical network indicators, such as SINR and throughput, while ignoring the problem of end users Heterogeneous needs and service experience. Based on this, this paper proposes a network handover algorithm based on QoE. The algorithm first establishes the discretized QoE hierarchical model based on the average subjective scoring (MOS) mechanism and then gives the corresponding network switching criterion according to the actual QoE level corresponding to different networks, and only when the new network makes the QoE level of the user improve Network switching, which to some extent reduce the blind pursuit of capacity optimization caused by the network switching overhead. Simulation results show that compared with the existing algorithms, the proposed algorithm can significantly reduce the overall number of network handovers under the premise of ensuring QoE level, thus reducing network overhead and improving network performance.