\begin{tabular}{|p{45pt}|p{28pt}|p{28pt}|p{33pt}|p{33pt}|}
  \hline
     & Tree-\par based & Mesh-\par based & Stateless \par
                                multicast& Overlay \par multicast          \\ \hline
  Periodic \par message & \rb{Yes}  & \rb{Yes}  & \rb{No}   & \rb{No}      \\ \hline
  Robustness \par for mobility
                       & \rb{No}    & \rb{Yes}  & \rb{Yes}  & \rb{Yes}     \\ \hline
  Resource \par efficiency
                       & \rb{High}  & \rb{Low}  & \rb{High} & \rb{Medium}  \\ \hline
  Type of \par data packet & Multi-\par cast
                        & Multi-\par cast & Broad-\par cast & \rb{Unicast} \\ \hline
  Control \par overhead & \rb{High} & \rb{High} & \rb{Low}  & \rb{Medium}  \\ \hline
\end{tabular}