Describe the most popular wireless Internet access technologies today. Compare a

Question

Describe the most popular wireless Internet access technologies today. Compare and contrast them. What is the key distinguishing difference between a tier-1 ISP and a tier-2 ISP? How long does it take a packet of length 1,000 bytes to propagate over a link of distance 2, 40 km, propagation speed 2.4 astir 10^8 m/s, and transmission rate 2 Mbps? More generally, how long does it take a packet of length L to propagate over a link of distance d, propagation speed s, and transmission rate R bps? Does this delay depend on packet length? Does this delay depend on transmission rate?

Explanation / Answer

4. There are two popular wireless Internet access technologies today:

a) In a wireless LAN, wireless users transmit/receive packets to/from anbasestation(i.e., wireless access point) within a radius of few tens of meters. The base station istypically connected to the wired Internet and thus serves to connect wireless users to the wirednetwork.

b) 3G and 4G wide-area wireless access networks. In these systems, packets are transmitted overthe same wireless infrastructure used for cellular telephony, with the base station thus beingmanaged by a telecommunications provider. This provides wireless access to users within aradius of tens of kilometers of the base station.

5. Key Difference Between Tier-1 ISP and Tier-2 ISP:

6. ANSWER:

a. (2,40*10^3)/(2.5*10^8) =2400/(2.4x108)=0.001s = 1ms

b. It take a packet of length L to propagate over a link of distance d, propagation speed s, and transmission rate R bps : d/s

c. Does this delay depend on packet length? No

d. Does this delay depend on transmission rate? No

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