Table 1 Parameters about the packet arrival rate and service rate of the PUs

Index of subchannel (n)

1–3

4–6

7–10

11–14

15–18

Bandwidth of subchannel (MHz)

1

1

1

1.2

1.5

Case 1

\(\lambda _{n}^{(\mathrm {p})}\)

5

10

10

10

5

\(\mu _{n}^{(\mathrm {p})}\)

15

20

15

20

15

Case 2

\(\lambda _{n}^{(\mathrm {p})}\)

5

10

10

10

5

\(\mu _{n}^{(\mathrm {p})}\)

10

20

15

15

10

Case 3

\(\lambda _{n}^{(\mathrm {p})}\)

8

15

10

12

5

\(\mu _{n}^{(\mathrm {p})}\)

10

20

15

15

10