Fault-tolerant ring embedding in a star graph with both link and node failures

Abstract

The star graph interconnection network has been recognized as an attractive alternative to the hypercube network. Previously, the star graph has been shown to contain a Hamiltonian cycle. In this paper, we consider an injured star graph with some faulty links and nodes. We show that even with f/sub e//spl les/n-3 faulty links, a Hamiltonian cycle still can be found in an n-star, and that with f/sub v//spl les/n-3 faulty nodes, a ring containing at most 4f/sub v/ nodes less than that in a Hamiltonian cycle can be found (i.e. the ring contains at least n!-4f/sub v/ nodes). In general, in an n-star with f/sub e/ faulty links and f/sub v/ faulty nodes, where f/sub e/+f/sub v//spl les/n-3, our embedding is able to establish a ring containing at least n!-4f/sub v/ nodes.