Table 1 Simulation parameters

Network size

70 × 70 m

Channels number

4

Time slots number

5

CR nodes number

40

CR node’s communication range

25 m

PUs number

15

PU’s interference range

40 m

Transmission requirements

500 packets

Speed

10 packets/sec.

Channel hopping time

0.2 s

Timeout threshold

0.5 s

CR nodes locations

Fixed

PUs movements

Random