Suppose that your home 802.11 wireless network performs very poorly. After some

Question

Suppose that your home 802.11 wireless network performs very poorly. After some testing you find out that a large fraction of the transmitted packets is lost. You want to figure out the root cause of the problem. Assume that your wireless network does not use RTS/CTS (which is often the case in practice 1. Suppose that you test the wireless network with packets of different sizes and you find out that the packet loss probability increases with the size of the packet. Further, the packet loss probability does not seem to vary with time. What is the most likely cause of the problem low signal-to-noise ratio, the presence of a hidden terminal, congestion, or the neighbors wireless network that operates at a different channel? Explain your answer 2. In a different scenario, suppose that when you test with packets of different sizes you find out that the packet loss probability does not depend on the size of the packets. However, the packet loss probability varies suddenly between 0 and a large value. What is the most plausible explanation for this pathology: low signal-to-noise ratio, the presence of a hidden terminal, congestion, or the neighbors wireless network that operates at a different channel? Explain your answer

Explanation / Answer

1) Hidden Terminal: Hidden terminal is the node which cannot sense the ongoing transmission but can cause interference to corrupt the reception. SNR and congestion vary with time but in this case packet loss remains same with time and also neighbors network operates at a different channel so that can also not affect transmission in the current network. Thus problem could be hidden terminal.

2) Congestion: If there is a sudden change in packet loss probability then there is a possibility that at that point in time network is highly congested and which is causing packet loss. Packet loss in this scenario might decrease after a certain period of time. All the other parameters hidden terminal, neighbors wireless network, SNR might not experience such drastic change in such a small time interval.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.