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Dynamic Ring Exploration with (H,S) View

1
Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka 565-0871, Japan
2
Nara Institute of Science and Technology, 8916-5 Takayamacho, Ikoma, Nara 630-0101, Japan
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the proceedings of the 21st International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS 2019), Pisa, Italy, 22–25 October 2019.
Algorithms 2020, 13(6), 141; https://doi.org/10.3390/a13060141
Received: 22 April 2020 / Revised: 8 June 2020 / Accepted: 9 June 2020 / Published: 12 June 2020
The researches about a mobile entity (called agent) on dynamic networks have attracted a lot of attention in recent years. Exploration which requires an agent to visit all the nodes in the network is one of the most fundamental problems. While the exploration of dynamic networks with complete information or with no information about network changes has been studied, an agent with partial information about the network changes has not been considered yet despite its practical importance. In this paper, we consider the exploration of dynamic networks by a single agent with partial information about network changes. To the best of our knowledge, this is the very first work to investigate the exploration problem with such partial information. As a first step in this research direction, we focus on 1-interval connected rings as dynamic networks in this paper. We assume that the single agent has partial information called the ( H , S ) view by which it always knows whether or not each of the links within H hops is available in each of the next S time steps. In this setting, we show that H + S n and S n / 2 (n is the size of the network) are necessary and sufficient conditions to explore 1-interval connected rings. Moreover, we investigate the upper and lower bounds of the exploration time. It is proven that the exploration time is O ( n 2 ) for n / 2 S < 2 H 1 , O ( n 2 / H + n H ) for S max ( n / 2 , 2 H 1 ) , O ( n 2 / H + n log H ) for S n 1 , and Ω ( n 2 / H ) for any S where H = min ( H , n / 2 ) . View Full-Text
Keywords: distributed algorithms; dynamic networks; 1-interval connected rings; mobile agent; exploration distributed algorithms; dynamic networks; 1-interval connected rings; mobile agent; exploration
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Gotoh, T.; Sudo, Y.; Ooshita, F.; Masuzawa, T. Dynamic Ring Exploration with (H,S) View. Algorithms 2020, 13, 141.

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