MOBILE COMMUNICATION QUESTION BANK
PART I
List the parameters of GSM and IS – 95 system.
What do you understand by co channel interference and adjacent channel interference.
What factors influence the choice of digital modulation technique
What is soft and hard handoff?
What is meant by Coherent Bandwidth
What is meant by Coherent Time.
List and briefly describe different Media Access Mechanisms of Mobile Systems.
Describe the services provided by GSM network.
What is authentication and how it is carried out.
Describe Radio Interface of GSM.
Part II
What do you understand by Frequency Reuse?
Compute the number of channel available per cell for the following specification for N = 7 and N = 4. Total channel bandwidth = 40 MHz; Simplex bandwidth = 20 KHz; control channel BW = 1 MHz;
3. How co channel interference and system capacity are linked.
4. . If a signal to interference ratio of 15 db is required for satisfactory forward channel performance of a cellular system, what is the frequency reuse factor and cluster size should be used for maximum capacity if the path loss exponent is a) n = 4 and b.) n=3. Assume that there are six co channel cells in the first tier and all of them are at the same distance from the mobile. . Use suitable assumption.
What are the strategies involved in increasing the coverage and capacity of cellular system.
Briefly describe QPSK and p/4 QPSK Modulation technique.?
Briefly describe GMSK Modulation.
Compare the performance of various digital modulation schemes.
Briefly describe Two Ray Reflection Model and Knife Edge Diffraction Model.
List the path loss models and describe the Okumara Model.
What factors influence small scale fading.
Explain small scale fading based on multipath time delay and Doppler spread
Briefly describe CDMA media access mechanism.
Draw and describe the GSM functional architecture.
How security management carried out in GSM
Describe the purpose of GSM control Channels
Compare various media access control mechanisms.
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