论文标题

定时游戏具有有限的窗口奇偶校验目标

Timed Games with Bounded Window Parity Objectives

论文作者

Main, James C. A., Randour, Mickael, Sproston, Jeremy

论文摘要

Chatterjee等人引入的窗户机制。对于在图表上基于两人的转弯游戏中的平均付款和总付款目标,请通过时间范围来完善长期目标。事实证明,这种机制在各种环境中以及最近在定时系统中有用。 在定时设置中,已经研究了所谓的定时窗口奇偶校验目标。固定的定时窗口奇偶校验目标是针对某个时间绑定的定义,并要求我们始终见证一个时间范围,即大小的窗口小于小于最小优先级的固定界限。在这项工作中,我们专注于有限的定时窗口均衡目标。如果存在一些固定目标的界限,则可以满足这样的目标。对有限目标的满意度对于建模选择(例如在约束中出现的常数)而言是强大的,与固定目标不同,常数的选择可能会影响给定界限的满意度。 我们表明,可以在多项式空间中执行定时窗口目标的有限定时窗口目标的验证,即使对于多目标扩展,也可以在指数时间内解决具有这些目标的定时游戏。这匹配固定情况的复杂性类别。我们还提供了窗口奇偶校验目标的不同变体的比较。

The window mechanism, introduced by Chatterjee et al. for mean-payoff and total-payoff objectives in two-player turn-based games on graphs, refines long-term objectives with time bounds. This mechanism has proven useful in a variety of settings, and most recently in timed systems. In the timed setting, the so-called fixed timed window parity objectives have been studied. A fixed timed window parity objective is defined with respect to some time bound and requires that, at all times, we witness a time frame, i.e., a window, of size less than the fixed bound in which the smallest priority is even. In this work, we focus on the bounded timed window parity objective. Such an objective is satisfied if there exists some bound for which the fixed objective is satisfied. The satisfaction of bounded objectives is robust to modeling choices such as constants appearing in constraints, unlike fixed objectives, for which the choice of constants may affect the satisfaction for a given bound. We show that verification of bounded timed window objectives in timed automata can be performed in polynomial space, and that timed games with these objectives can be solved in exponential time, even for multi-objective extensions. This matches the complexity classes of the fixed case. We also provide a comparison of the different variants of window parity objectives.

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