Model Each node works per round synchronized by a global clock (like GPS) The initial information of each node ID of itself Whether it is source or not(RB and ARB) Each node cannot receive two or more messages in one round Collision detection is not available Round: Discrete time step of the global clock Actions per round transmission or reception process before and after communicationRound: Discrete time step of the global clock Model Actions per round: • transmission or reception • process before and after communication • Each node works per round synchronized by a global clock (like GPS). • The initial information of each node – ID of itself – Whether it is source or not (RB and ARB) • Each node cannot receive two or more messages in one round • Collision detection is not available