Exclusive perpetual ring exploration without chirality

Abstract : In this paper, we study the exclusive perpetual exploration problem with mobile anonymous and oblivious robots in a discrete space. Our results hold for the most generic settings: robots are asynchronous and are not given any sense of direction, so the left and right sense (\emph{i.e.} chirality) is decided by the adversary that schedules robots for execution, and may change between invocations of a particular robots (as robots are oblivious). We investigate both the minimal and the maximal number of robots that are necessary and sufficient to solve the exclusive perpetual exploration problem. On the minimal side, we prove that three deterministic robots are necessary and sufficient, provided that the size $n$ of the ring is at least $10$, and show that no protocol with three robots can exclusively perpetually explore a ring of size less than $10$. On the maximal side, we prove that $k=n-5$ robots are necessary and sufficient to exclusively perpetually explore a ring of size $n$ when $n$ is co-prime with $k$.
Complete list of metadatas

Cited literature [8 references]  Display  Hide  Download

https://hal.inria.fr/inria-00464206
Contributor : Maria Potop-Butucaru <>
Submitted on : Tuesday, March 16, 2010 - 2:14:41 PM
Last modification on : Thursday, March 21, 2019 - 2:29:50 PM
Long-term archiving on : Friday, October 19, 2012 - 10:00:19 AM

File

perpetual-last.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : inria-00464206, version 1

Citation

Lélia Blin, Alessia Milani, Maria Potop-Butucaru, Sébastien Tixeuil. Exclusive perpetual ring exploration without chirality. [Research Report] Université d'Evry Val d'Essonne. 2010, pp.17. ⟨inria-00464206⟩

Share

Metrics

Record views

489

Files downloads

284