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考虑到在无线多跳网络中存在多个相互独立的多播流的调度问题,首先提出了一个基于网络编码的动态多源多播模型,并根据该模型设计了一个适用于802.11DCF MAC的多播算法MulSrc。MulSrc以队列积压作为流调度的主要依据,以网络编码作为数据传输和本地恢复的主要手段,无固定的传输路径,在无线网络中实现以丰富的多路径来克服相关丢失、降低延迟的目标,适用于无线网络中大量存在的随机丢包情况。实验证明,在存在多个多播流的网络上,MulSrc可以取得比同类协议CodeCast和MMForests更好的性能。
Considering the scheduling problem of multiple independent multicast streams in a wireless multi-hop network, a dynamic multi-source multicast model based on network coding is proposed. Based on this model, a multi-hop multicast model that is suitable for 802.11DCF MAC is designed Broadcast algorithm MulSrc. MulSrc uses queuing backlog as the main basis for stream scheduling, uses network coding as the main means of data transmission and local recovery, and has no fixed transmission path. In order to overcome the related loss and reduce the delay, MulSrc achieves rich multipath in wireless networks, Suitable for a large number of random packet loss in wireless networks. Experiments show that in a network with multiple multicast streams, MulSrc can achieve better performance than the comparable protocols CodeCast and MMForests.