Problem: a) Why is it important to reduce the cost of mobile registration & de-registration? b) How can registration cost be reduced? c) What are the advantages and disadvantages of each proposed scheme in (b)? d) How can the cost of de-registration be reduced? e) What are the advantages and disadvantages of each proposed scheme in (d)? Problem 2: A Kuwait-based business traveler travels from Kuwait to Doha then returns to Kuwait airport to change planes to travel to Cairo. a) Describe how the roaming process works in detailed but concise steps. b) What assumptions have you made? Problem 3: In problem (2) explain the attachment and detachment steps taking place during the entire journey. Problem 4: a) What are IMSI and TMSI? b) What are their role in cellular networks? c) Why do we need BOTH of them? Can't we just use one? Problem 5: a) What is MSRN and MSISDN? b) What are their role in cellular networks? c) Why do we need BOTH of them? Can't we just use one