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Question:
(a) Show the main elements of the GSM system architecture and describe their functions.
(b) Looking at the HLR/VLR database approach used in GSM-how does this architecture limit the scalability in terms of users, especially moving users?
(c) Protocol stacks are divided into planes. What is the purpose of the division C/U/M planes.
(d) Why is there a difference in the performance of a UTRAN depending of a vendor?
(e) A system has an overall throughput of 2 Mbps. OVSF codes are used. Two subscribers are using the spreading factor SF=4.
(i) How many subscribers with SF=16 can transmit data simultaneously?
(ii) What is the transmission rate for the subscribers when a constant chip rate is assumed?
(f) Show the basic handover types in UMTS.
(a) Explain how a CDMA system works? (b) Explain howWelsh-Hadamard codes are generated. Explain why orthogonality between different spreading codes is important. (c) Consider
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