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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.
Can you describe the concept of Collision domain?
Large data packets result in fewer load because a smaller part of the packet is used for header information. Optimum networks use 4kB data packets or larger. Large data packets
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Network Control protocols ( NCP) The first ARPANET networking protocols was named simply the network control protocols in 1970,and was created by created by network
Question: (a) Distinguish between UDP and TCP. (b) You have been asked to design and implement a chat application for a university. Which protocol could you used TCP or UDP
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Assume the following 64-bit DES key (expressed in hexadecimal): FEFE FEFE FEFE FEFE (a) What is the term for such a key? (b) State the value of each of the 48-bit round keys
Can you explain LAC and LNS?
Question: (a) In relation with a cellular network architecture, describe the following terms: (i) Clusters (ii) Pico cells (iii) Nano cells (iii) Cell breathing (b)
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