Fast broadcasting and gathering in q-ary cubes using error-correction codes

An interesting application of coding theory in network routing is presented. Certain error-correcting codes can be employed to specify a minimal subset of nodes called "stations" which are at distance t from the rest of the nodes. The stations, acting as relay agents, can then broadcast data/control information from a central controller to all the nodes (or conversely from the nodes to the central controller) in no more than t steps. The network considered is the q-ary n-dimensional hypercube. The study shows that for a given t, perfect codes yield the minimal set of stations whereas quasi-perfect codes render suboptimal solutions. (C) 1998 Academic Press.