基于用户体验的VLC／WiFi异构网络切换算法

Qo E-Based Handover Scheme for Indoor VLC-WiFi Heterogeneous Systems

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 network selection problem in heterogeneous networks consist of Visible Light Communication （VLC） and WiFi, most of the existing studies only focus on the optimization of physical network indicators, such as SINR and throughput, while ignoring the demand and service experience of users. Therefore, this paper presents a network switching algorithm based on user quality of experience （QoE）. In the algorithm, the discrete QoE level model is firstly set up based on the Mean Opinion Score （MOS）, and then the corresponding network handover criterion is given according to the actual QoE level of different network. The handover scheme is performed if and only the new network makes the user QoE level improve, thus reducing network switching cost by the bind pursuit of higher data rate. Simulation results show that the proposed algorithm can significantly reduce the overall number of network handoffs while maintain the QoE level, thus reducing the network cost and improving the network performance.