关键词: 非理想反馈, 有序数据, 渐进式传输, 多播, 无线网络

Abstract: “In-order” data refer to data that exhibit priority characteristic. To enhance the user quality of experience, the re-ordering delay and decoding delay of in-order data should be minimized. With imperfect feedbacks, the base station can only receive partial user feedbacks and cannot retransmit efficiently. To solve this problem, this paper firstly analyzes the effect of feedback lost on retransmission efficiency, and then proposes three heuristic packets update policies to relieve the negative effect. Extensive simulation results show that the completion time and the total access time of full packets update policy are the best among all proposed policies.

Key words: imperfect feedbacks, in-order data, progressive transmission, multicast, wireless networks