Computational results on semistrong edge coloring of graphs

The semistrong edge coloring, as a relaxation of the well-known strong edge coloring, can be used to model efficient communication scheduling in wireless networks. An edge coloring of a graph $G$ is called \emph{semistrong} if every color class $M$ is a matching such that every edge of $M$ is incident with a vertex of degree 1 in the subgraph of $G$ induced by the endvertices of edges in $M$. The \emph{semistrong chromatic index} $\chi_{ss}'(G)$ of $G$ is the minimum number of colors required for a semistrong edge coloring. In this paper, we prove that the problem of determining whether a graph $G$ has a semistrong edge coloring with $k$ colors is polynomial-time solvable for $k\le2$ and is NP-complete for $k\ge3$. For trees, we develop a polynomial-time algorithm to determine the semistrong chromatic index exactly.