Linear time and space gathering of anonymous mobile agents in asynchronous trees
Linear time and space gathering of anonymous mobile agents in asynchronous trees
复制标题
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
中科院分区:
文献类型:
--
作者:
Daisuke Baba;Tomoko Izumi;Fukuhito Ooshita;Hirotsugu Kakugawa;Toshimitsu Masuzawa
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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10.1007/978-3-540-27796-5_15
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