Algorithm 4: Fault-Tolerance Mechanism for SDVN

Input:$W_1$ & $W_2$ (Two list one of safety messages while the other one of non-safety messages) Output: £ (Successful messages)   For 1 to n    If Source received Ack    Then assign $M_i$ to £ (Successful messages) // No action    Else    {    assign $M_i$ to $\varphi$ (Failed tasks/messages) // resend messages    Call Algorithm 3    }   End of for loop   Return £