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The authors consider the problem of broadcasting data streams over a wireless network for multiple receivers with reliability and timely delivery guarantees. In their framework, they consider packets that need to be delivered within a given time interval, after which the packet is no longer useful at the application layer. They set the notion of critical packet and, based on periodic feedback from the receivers, they propose a retransmission scheme that will guarantee timely delivery of such packets, as well as packets that are innovative for other receivers.
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