📶 Visualizing the transmission between users and base stations!
Play with it! https://chonyy.github.io/handoff-visualizer/
Handoff is the transition for any given user of signal transmission from one base station to a geographically adjacent base station as the user moves around. In this project, we visualize the process of handoff by generating cars moving around the blocks and connecting them to different base stations based on different policies.
This project is to visualize handoff and make the concept of handoff in wireless network easy to understand. Different policies are implemented to perform the handoff in different situations. The goal is to make the users try out all the different policies, understand the differences, and find out the most efficient policy.
If your are interested in this visualiztion, please also check out the handoff-simulator. We want people to understand handoff in this visualizer project, and we value the data in that handoff-simulator.
- Velocity = 72km/hr = 20m/s
- Probability of cars entrance follows Poisson distribution
- ⋋ = 1 cars/ min [ P(t) = ⋋"e" ^(−"⋋" ) (t is in sec) ]
- Probability of cars turning based on predefined value listed below
- Received Power Calculation explained below
The probability of the entrance follows Poisson distribution
In our simultation
- ⋋ = 0.0167 cars/ sec
- k = 1
The received power is calculated by the formula below. Read ScienceDirect to dig deeper.
- Base station transmission Pt(mW) = -50 dBm
- Base = 1mW
- 10log(Pt / Base) = dBm
- First-meter path loss = 10 dBm
- P0 = -50 dBm
- Pd = -50 - 10 - 20log(d(m) / 1m)
Received Power referred to P, base station referered to B.
Threshold referred to T, entrophy referred to E.
if (Pnew > Pold) {
car.bs = Bnew;
car.power = Pnew;
}if (Pnew > Pold && Pold < T) {
car.bs = Bnew;
car.power = Pnew;
}if (Pnew > Pold + E) {
car.bs = Bnew;
car.power = Pnew;
}if (Pnew < Pmin) {
car.bs = Bnew;
car.power = Pnew;
}
Handoff is the transition for any given user of signal transmission from one base station to a geographically adjacent base station as the user moves around.
Each time a mobile or portable cellular subscriber passes from one cellinto another, the network automatically switches coverage responsibility from one basestation to another. Each base-station transition, as well as the switching processor sequence itself, is called handoff.
The different parameters for each policy are listed below.
| Parameters | Value |
|---|---|
| Threshold | -108 dBm |
| Entrophy | 5 dBm |
| Minimum | -112 dBm |
The possibility of changing direction when encountering intersection is listed below.
| Direction | Possibility |
|---|---|
| Go straight | 1/2 |
| Turn right | 1/3 |
| Turn left | 1/6 |
| Direction | Possibility |
|---|---|
| Turn right | 1/2 |
| Turn left | 1/2 |
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