关键词: 优先级, 应用层组播, 横向差错恢复

Abstract: This paper proposes a Priority-based Lateral Error Recovery（PLER） model in application layer multicast.In PLER，nodes are divided into a number of groups，each of which forms an independent group.Since error correlation across groups is low，a node effectively recovers its error by “laterally” requesting retransmission from nearby nodes in other groups.Using Internet-like topologies，this paper shows via simulations that PLER is an effective error recovery mechanism.As compared with traditional recovery schemes，PLER achieves much lower average link stress and attains much lower residual loss rate.

Key words: priority, application layer multicast, lateral error recovery