Network A uses a Slotted Aloha protocol. The slot size and the packet length are
ID: 3852658 • Letter: N
Question
Network A uses a Slotted Aloha protocol. The slot size and the packet length are one time unit. There is infinite number of nodes and old and new packets are transmitted according to a Poisson arrival process with an arrival rate GA (packets/time unit).
a. What is the throughput in Network A? Network B was deployed near Network A. The protocol used in Network B is also Slotted Aloha. The slot size and the packet length are one time unit. There is infinite number of nodes and old and new packets are transmitted according to a Poisson arrival process with arrival rate GB (packets/time unit). The slots in networks A and B are not synchronized and packets from both networks interfere with each other.
b. What is the throughput in Network B? The operators of the networks managed to synchronize the slots such that they start simultaneously in both networks.
c. What is the throughput in Network B in this new setting?
Explanation / Answer
a)
S=Ge-G=2.30259*e-2.30259=0.230258. The throughput is 23.0258%, below the optimal 36.8%
b)