Booker took part in last Saturday's rookie minicamp practices after missing the previous day's work so he could participate in graduation ceremonies.
His on-field work was limited as he continues recovering from a torn meniscus, but he did take handoffs and cut back on both knees.
Booker is expected to fully participate in practices by June.
Simmons was a full participant in last week's minicamp, and is poised to push for a backup slot behind starters T.J. Ward and Darian Stewart. The Boston College product could also have an extensive role on special teams right away.