Question:

a) With the help of a diagram, describe clusters in cellular systems.

b) Describe the role of the following components in the GSM architecture

• Radio Sub-System
• Network and Switching Sub-System
• Operational Sub-System

c) Briefly describe a popular 3G system.

d) What is the ISM band and what is particular about this frequency band? Name two wireless technologies that make use of the ISM frequency band.

e) What is a piconet in a Bluetooth context? Discuss the concept of Master, slave, stand-by and parked devices with respect to a Bluetooth piconet.

f) Consider the security aspects in both Wireless Local Area Networks (LANs) and Personal Area Networks (PANs).

i) What are the security problems introduced in Wireless LANs and PANs?

ii) What level of security can the IEEE 802.11 and Bluetooth standards provide?