Table 2 Notations and definitions used for WF-MAC
Notation | Description |
|---|---|
\(\mathcal {M}\) | Set of Licensed channels; { 1,2,3,…,m} |
\(\mathcal {N}_{r}\) | Set of SUs of CRN r; { 1,2,3,…,n} |
Ω | Set of traffic types |
ρ | Priority value assigned to a specific traffic |
H i | Status of channel i; { 0,1,2} |
t | Time needed to sense a channel |
σ s | Number of retransmissions for collision with SU |
σ p | Number of retransmissions for PU appearance |
\({\lambda ^{s}_{i}}\) | SU arrival rate over channel i |
\({\lambda ^{p}_{i}}\) | PU arrival rate over channel i |
\(\mathcal {E}\) | Channel availability vector |
\(\mathcal {U}\) | Channel utility perception vector |
\(\mathcal {O}\) | Channel usage outcome { o 1,o 2,o 3,o 4} |
C W ρ | Contention window for packet priority type ρ |