# csma_simulation
This is a CSMA/CA simulation in MATLAB. I can't find one from the Internet, so I code it on my own.
Free free to play with it.
Development timeline:
1. 5 slaves talk to master with fixed data size
Algorithm:CSMA/CA(Carrier sense multiple access with collision avoidance)
- waiting period before sending(check if channel is idle)
- collision happend random backoff
Simulation:Matlab Version simulation
- 8 states in CSMA/CA
when will this algorithm fails:
- the collision slaves always random backoff for the same amount of time
2. support different data size
Algorithm:
- add 1 receiving state in the simulation
- when only 1 node is sending data trigger receiving states of receiver
when will this algorithm fails:
- Almost never
3. support priority and prevent low priority slaves from starving
Algorithm:
- max waiting time before sending depends on the priority, the higher priority the shorter max waiting time
- backoff time also depends on priority, the higher priority the shorter max waiting time
- to prevent starves low priority slaves, we make all the waiting time as random number from a range
