Research publications treating fairness issues of multicast and unicast, usually focus on fair-share of link bandwidth, like TCP-friendliness. This is a microscoic approach because the behavior of multicast and unicast traffic only on a link is investigated. In the paper, we would like to try a new approach, a macroscopic approach, to address this issue. From the fact that multicast communication uses network resources more efficiently than unicast, we think that multicast traffic should be given priority. According to this concept, we propose a packet-discarding method at a router which gives packet loss probability based on the number of receivers coming in the path after the router.
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