Linear time and space gathering of anonymous mobile agents in asynchronous trees

Linear time and space gathering of anonymous mobile agents in asynchronous trees
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异步树中匿名移动代理的线性时空聚集

DOI:
10.1016/j.tcs.2013.01.022
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发表时间:
2013
影响因子:
1.1
通讯作者:
Toshimitsu Masuzawa
Toshimitsu Masuzawa
中科院分区:
计算机科学4区
文献类型:
--
作者:
Daisuke Baba;Tomoko Izumi;Fukuhito Ooshita;Hirotsugu Kakugawa;Toshimitsu Masuzawa

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研究了异步匿名树网络中具有k个匿名代理的聚集问题的(理想)时间和空间复杂性之间的关系。聚集问题要求网络中的所有代理必须在有限时间内在单个节点相遇。虽然已知一种渐近空间最优算法,但其时间复杂度相当大。本文研究了渐近(理想)时间最优算法,并研究了渐近时间最优算法的每个代理的最小内存需求。首先,我们证明了存在一个有n个结点的树,其中每个代理需要Ω(N)比特的内存才能在O(N)时间内(渐近时间最优)解决聚集问题。然后,我们提出了一种渐近时间最优的聚集算法。如果每个代理具有O(N)位内存,则可以执行该算法。根据这个上下界,该算法在时间复杂度为渐近最优的条件下是渐近空间最优的。
We investigate the relation between the (ideal) time and space complexities for the gathering problem with k anonymous agents in asynchronous anonymous tree networks. The gathering problem requires that all the agents in the network have to meet at a single node within a finite time. Although an asymptotically space-optimal algorithm is known, its time complexity is quite large. In this paper, we consider asymptotically (ideal-)time-optimal algorithms and investigate the minimum memory requirement per agent for asymptotically time-optimal algorithms. First, we show that there exists a tree with n nodes in which Ω(n) bits of memory per agent is required to solve the gathering problem in O(n) time (asymptotically time-optimal). Then, we present an asymptotically time-optimal gathering algorithm. This algorithm can be executed if each agent has O(n) bits of memory. From this lower/upper bound, this algorithm is asymptotically space-optimal on the condition that the time complexity is asymptotically optimal.
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