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problem 1: Describe how a Mobile Terminating call, from a PSTN phone, is processed in a GSM network. Describe your answer with a proper diagram.

problem 2: Top-Net, a new telecommunication service provider wants to implement a 3G cellular network in Mauritius. They decide on using the chipping code 101101 for the code division multiplexing.

a) Supposing no scrambling code is used, what are the chipping sequences which can be derived from the original chipping code in order to encode four different data streams in a Top-Net 3G cell?

b) Supposing the data rate if the original chipping code is used is 512kbit/s and supposing a constant chipping rate of 3.84Mchip/s, what will be the new data rate for each of the four chipping sequences you computed above?

c) Describe on the result of problem (b) above; is the resultant data rate a reasonable value for typical 3G networks?

d) The Engineers at Top-Net are new to 3G as they have primarily worked on GSM networks before. They are worried regarding the effects like cell breathing, multi-path propagation and shadowing.  Describe each of these effects in brief.

e) What property of the architecture of 3G networks, inherently take care of the problems mentioned in problem (d) above? describe this property in brief.

f) Why is a 3G network usually more expensive to set up as compared to GPRS or GSM networks? How can the setting up costs be alleviated?

Computer Engineering, Engineering

  • Category:- Computer Engineering
  • Reference No.:- M95941

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