Multicast Routing for Energy Minimization Using Speed Scaling
Multicast Routing for Energy Minimization Using Speed Scaling
复制标题
使用速度缩放实现能量最小化的多播路由
DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
Cliff Stein
中科院分区:
文献类型:
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作者:
N. Bansal;Anupam Gupta;Ravishankar Krishnaswamy;V. Nagarajan;K. Pruhs;Cliff Stein
We consider virtual circuit multicast routing in a network of links that are speed scalable. We assume that a link with load f uses power σ+fα, where σ is the static power, and α>1 is some constant. We assume that a link may be shutdown if not in use. In response to the arrival of client i at vertex ti a routing path (the virtual circuit) Pi connecting a fixed source s to sink ti must be established. The objective is to minimize the aggregate power used by all links.
We give a polylog-competitive online algorithm, and a polynomial-time O(α)-approximation offline algorithm if the power functions of all links are the same. If each link can have a different power function, we show that the problem is APX-hard. If additionally, the edges may be directed, then we show that no poly-log approximation is possible in polynomial time under standard complexity assumptions. These are the first results on multicast routing in speed scalable networks in the algorithmic literature.