Depth-Latency Tradeoffs in Multicast Tree Algorithms

The construction of multicast trees is complicated by the need to balance a number of important objectives, including: minimizing latencies, minimizing depth/hops, and bounding the degree. In this paper we study the problem of determining a degree-bounded directed spanning tree of minimum average-latency in a complete graph where the inter-node latencies determine a metric. In particular, we focus on measuring the effects on average latency when imposing depth constraints (i.e., bounds on hop count) on degree-bounded spanning trees. The general problem is a well known NP-hard problem, and several recent works have proposed approximate solutions which aim at minimizing either depth or latency. In this work, we present a new heuristic algorithm which improves upon previous solutions by considering both depth and latency and the tradeoffs between them. Our algorithms are shown to improve the theoretical worst-case approximation factors, and we show improvements under empirical evaluation...

• Type: Conference
• Year: 2007
• Where: AINA
• Authors: Michael T. Helmick, Fred S. Annexstein
• Keywords: AINA 2007, Computer Networks, Degree-bounded Directed Spanning, Degree-bounded Spanning Trees, Spanning Trees