Algorithm 4 System time allocation scheme
1:	Input:$D_{max}$, precision ${\epsilon }_{\tau }$
2:	Output:${\tau }^{\mathrm{h}*}$, ${\tau }^{\mathrm{t}*}$, $minPr\{D>D_{max}\}$
3:	for all ${\tau }^{\mathrm{h}}$ do
4:	switch TD mode do
5:	case: TDMA
6:	${\tau }_k^{\mathrm{t}}=(1-{\tau }^{\mathrm{h}})/K$.
7:	$B_k=W$.
8:	case: FDMA
9:	${\tau }_k^{\mathrm{t}}=1-{\tau }^{\mathrm{h}}$.
10:	$B_k=W/K$.
11:	end switch
12:	Apply Algorithm 3 to find out optimal ${\lambda }_a$ for ${\tau }^{\mathrm{h}}$.
13:	Compute $Pr\{D>D_{max}\}$ according to Equation (10) and Constraint 4 of problem P2.
14:	end for
15:	Find out $minPr\{D>D_{max}\}$ and the corresponding ${\tau }^{\mathrm{h}*}$, ${\tau }^{\mathrm{t}*}$.
16:	END