Table 1 Most frequently used modeling notations
From: Analysis of hidden terminal’s effect on the performance of vehicular ad-hoc networks
Notation | Description |
|---|---|
ξ | Total number of lanes |
ω | Width of the lane (m) |
α | Vehicle density (vehicles/lane/km) |
D | BSM application data packet size (bytes) |
⌈x⌉ | Ceil(x): smallest integer greater than or equals to x |
SD | Symbol duration (μs) |
R | Data rate (bits/s) |
T DATA | Time required to transmit a data packet |
S DATA | Number of timeslots needed to transmit the data packet |
σ | Size of the timeslot (μs) |
R c | Communication range (m) |
R cs | Channel (carrier) sensing range (m) (1.5 × Rc) |
N c | Number of nodes in the communication range |
N cs | Number of nodes in the channel sensing range |
λ | Packet generation rate in each node (Hz) |
V | Set of vehicular nodes |
C | Set of communication sets of the nodes |
H(vi, vj) | Set of hidden terminals for the transmitter vi and receiver vj pair |
P h | Probability of collision due to hidden terminals |
P Tx | Probability of transmission in a slot |
N h | Average number of hidden terminal nodes for 2-D VANET |
T vul | Vulnerable time |
S vul | Number of slots in the vulnerable time |
P d | Probability of data availability in the MAC queue |
b(s) | Value of backoff counter at state s in the Markov Chain |
f(s) | Value of freezing slot at state s in the Markov Chain |
τ | Stationary probability of data transmission in a slot |
\( {\overline{M}}_D \) | Average (mean) MAC delay |
W 0 | Constant contention window size |
F | Number of continuous slots in the freezing state |