Answers in Questions about Wireless Networks

BISMIALLAH HIR RAHMAN NIR RAHEEM

Answers in Questions about Wireless Networks

answer the following questions in a simple way . Be brief when apropriate , but not too much detail needed

Question 1

a ) Wireless networking Quality of Service (QoS ) is very difficult to achieve

i ) Outline two main reasons why Wireless QoS is so difficult

ii ) Briefly explain four different approaches to Wirelles QoS

iii ) Discuss two different strategies for the QoS provision in wireless networks . Give an example application for each

b ) The most popular wirelles networking standard in

the word is the GSM system . 3G /UMTS represent an evolutiuon GSM

i ) How do the roles of Base Stations and Mobile Switching Centers differ in the GSM system

ii ) How does 3G /UMTS represent an evolution of GSM ? Does Wi-Fi have a role to play in this evolution (and if so how

c ) Provide an analysis of the contributing factors leading to the perceived failure of WAP . Who do you think was mostly to blame

d ) In recent years Wi -Fi implementations have become very popular in providing wireless networking

i ) Describe a typical use for Wi-Fi in a home enviroment entertainment system

ii ) Suggest an application that would use the Point Coordination Function (PCF ) within Wi-Fi

e ) Security is a considerable problem in wireless network enviroments Discuss the security concerns that might apply to an Internet cafy offering paid-for Wireless (LAN (Wi-Fi ) access to its customers Explain your answer

f ) Consider the provision of cellular telecommunications network coverage to a new exhibition centre . During the day the capacity in the local area could rise to 20000 and fall to 200 at night . Propose a strategy for efficiently allocating resources to the exhibition centre Explain and justify your answers

Question 2

a ) TCP performance is known to suffer over wirelless links

i ) What causes TCP to perform poorly over wirelles links

ii ) Briefly explain two approaches to overcoming the performance problem of TCP in wirelles enviroments

iii ) How does WAP attempt to solve the problem

b ) Wi-Fi has become a very popular wireless networking solution in recent years

i ) Descirbe a typical use for Wi-Fi in a home network

ii ) Suggest an application that would use the Point Coordination Function within Wi-Fi ? Can the hidden terminal problem occur using this mechanism ? Justify your answer

c ) Propose a wireless network that would enable students to swap notes electroniacally with each other in a tutorial class between 10 and 12 students . Simple justify your choices

References

Wireless QOs

http /www .nortel .com /solutions /wireless /collateral /66028 .25-09-01 .pdf ?w lc_popdocs_bodytext...