In this paper, a video multicast mechanism is studied in fiber-wireless (FiWi) access networks with object to guarantee the quality of experience (QoE) for different users. Firstly, according to the characteristics of scalable video coding, a new QoE evaluation model is built in terms of the video interruption probability, video bitrate and smoothness. Then the optimal transmission path is studied based on the coverage and transmission capabilities of ONU-BS nodes. Specifically, a bipartite graph is constructed based on which the multicast tree is obtained by solving the minimum dominating set problem. Thereafter, a video bitrate adjustment algorithm is proposed to reduce the video interruption probability based on the buffer state on the user side and meet the bitrate requirements for different users during multicast transmissions. Simulation results verify that the proposed scheme performs well in QoE guarantees for different users simultaneously.INDEX TERMS Fiber-wireless access networks, scalable video coding, quality of experience, multicast adaptation.

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