GSM_Interview Question -Answer

#GSM_Interview Question -Answer
1.what are the advantages of Frequency Hopping?
     
1.                    Frequency Diversity
2.                    Interference Averaging
3.                    capacity

2.What are the effects of freq hopping?
(Ans)
           1 Handovers:
           2 Call setup:
           3 Frame Erasure Rate (FER)

3. What are the reasons for Hand Overs?
(Ans) . (a) Signal Strength (RX LEVEL)
             (b) Signal Quality (RX Qual)
             (c) Power Budget
             (d)Timing Advance.
             (e) Interference

4.What are type of interference occur?
1.   Co- channel interference.
2.   Adj-channel interference.
3.   Near end- Far end interference.

5.  What is ERLANG?

·                     Unit of telephone traffic intensity is called Erlang.
·                     One ERLANG is one channel occupied continuously for one hour.
·                     1E = 64Kbps.

6. what do you mean by GOS?

· It is the probabity of having a call blocked during busiest hour.
· Ex GOS=0.05 means one call in 20 will be blocked call during busiest hour because of insufficient capacity.

7. What are the technique GSM offers which combat Multipath fading?

· Equalization
· Diversity
· Freq Hopping
· Interleaving
· Channel coding

For #more

http://rftelecomm.blogspot.com/2013/01/gsm-interview-question-answer.html?m=1