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arXiv 1409.5366cs.GT
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网络创意游戏中的服务质量

Quality of Service in Network Creation Games

Andreas Cord-Landwehr, Alexander Mäcker, Friedhelm Meyer auf der Heide

摘要:

网络创建游戏模拟了由n个自私节点组成的网络的创建和使用成本。每个节点v可以购买一组边,每个边的价格固定为α> 0。其目标是尽量减少私人成本,即,求和(SUM-game,Fabrikant等人,PODC 2003)或最大值(MAX-game,Demaine等人,PODC 2007)从$v$到所有其他节点的距离加上购买边的价格。上述论文证明了纳什均衡的存在性,以及无政府状态和稳定性价格的上界和下界。在随后的几篇论文中,这些界限在很大范围的价格α下得到了改进。在本文中,我们扩展了这些模型,将服务质量方面:每个边不能只购买固定的质量(边长1)为固定的价格α。相反,我们假设质量水平(即,边长)在固定的区间[β,B]中变化,0一个节点现在不仅可以选择购买的边缘,但也可以选择其质量x,为价格p(x),对于给定的价格函数p.对于这两个游戏和所有的价格函数,我们表明,纳什均衡存在,稳定的价格是恒定的或仅取决于可用的边缘长度的区间大小。我们的主要结果是无政府状态的无政府代价的界。在SUM博弈的情况下,我们表明,他们是紧的,如果价格函数下降足够快。

英文摘要:

Network creation games model the creation and usage costs of networks formed by n selfish nodes. Each node v can buy a set of edges, each for a fixed price α> 0. Its goal is to minimize its private costs, i.e., the sum (SUM-game, Fabrikant et al., PODC 2003) or maximum (MAX-game, Demaine et al., PODC 2007) of distances from $v$ to all other nodes plus the prices of the bought edges. The above papers show the existence of Nash equilibria as well as upper and lower bounds for the prices of anarchy and stability. In several subsequent papers, these bounds were improved for a wide range of prices α. In this paper, we extend these models by incorporating quality-of-service aspects: Each edge cannot only be bought at a fixed quality (edge length one) for a fixed price α. Instead, we assume that quality levels (i.e., edge lengths) are varying in a fixed interval [β,B], 0 < β<= B. A node now cannot only choose which edge to buy, but can also choose its quality x, for the price p(x), for a given price function p. For both games and all price functions, we show that Nash equilibria exist and that the price of stability is either constant or depends only on the interval size of available edge lengths. Our main results are bounds for the price of anarchy. In case of the SUM-game, we show that they are tight if price functions decrease sufficiently fast.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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