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QUESTIONS FOR DRIVE TEST
Que. Which versions are we using in TEMS?
Ans. 9.1 optional..
Que. On what parameters do SQI depends?
Ans. SQI depends on FER, BER & some other parameters.
Que. What is the range for SQI? What is the optimal value for SQI?
Ans. –22 to 30dB.The optimal values or SQI is 22 ,24, 26dB
Que. What is drive test? Why do we go for drive test.
Ans. Drive test is basically for the optimization part of the network.
Que. What are the parameters that we can measure from drive test?
Ans. SQI, Rx level, ARFCN, C/I , C/A, CGI, BSIC, Layer 2 messages, Layer3 messages,C1, C2.
Que. What is the unit of Rx quality?
Ans. BER (Bit error rate)
Que. What is the range of Rx quality?
Ans. 0-7 BER , but 0-4 is the optimal range.
Que. What are the various reasons for hand over?
Ans. Hand over occurs due to following reasons:
1. Due to signal strength.
2. Due to signal quality.
3. Due to timing advance.
4. Miscellaneous like due to low battery , or BTS power goes down.
Que. What is the maximum value of BER?
Ans. 12.5%
Que. On what BPS does the mobile connection is done?
Ans. 9600bps.
Que. What are the range for various parameters?
Ans.
C/I
Range 0-30 dbm
Best -18 & above
should be 12+ dBm. , Max. value is 25dBm.
ARFCN-124 (max.)
FER - Frame eraser report 0-4 max. value is 100.
Que. What does last digit indicates in cell ID?
Ans. Value for sector.
Que. What is discontinuous transmission (DTx.)?
Ans. Mechanism that allows radio transmitter to be switched off during speech pauses.
Que. In idle mode what is the nature of channel used?
Ans. Broadcast control channel.
Que. On what BPS does GPS connection is done?
Ans. 9600bps.
Que. CGI comprises of what components?
Ans. MCC+MNC+LAC+CI.
Que. What is the name given to handover ,done in idle mode?
Ans. Cell Reselection.
Que. What does timing advance denotes?
Ans. It denotes how far you are from particular site.
Que. Which factor does MAIO & HSN decides?
Ans. It decides in which order hopping frequencies are used
Que.What does GPRS support mean?
Ans. It means it supports multimedia transmission.
Que. What is ARFCN?
Ans. Absolute radio frequency channel number?
Que. What is MAIO?
Ans. Mobile allocation index offset.
It decides starting number of hopping frequency, Range total num of tch fr-1
Que. What is HSN?
Ans. Hopping sequence number. Hsn range 0-63, 0-cyclic hopping, 1-63 pn hopping
Que. What is the maximum value of HSN
Ans.1-63
Que. What is C/I?
Ans. Co- channel interference.
Que. What is C/A?
Ans. Adjacent channel interference
Que. What is BSIC?
Ans. Base station identity code.
Que. BSIC comprises of how many companies?
Ans. MCC (0-7)+ NCC (0-7)

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Questions for drive_test

  • 1. QUESTIONS FOR DRIVE TEST Que. Which versions are we using in TEMS? Ans. 9.1 optional.. Que. On what parameters do SQI depends? Ans. SQI depends on FER, BER & some other parameters. Que. What is the range for SQI? What is the optimal value for SQI? Ans. –22 to 30dB.The optimal values or SQI is 22 ,24, 26dB Que. What is drive test? Why do we go for drive test. Ans. Drive test is basically for the optimization part of the network. Que. What are the parameters that we can measure from drive test? Ans. SQI, Rx level, ARFCN, C/I , C/A, CGI, BSIC, Layer 2 messages, Layer3 messages,C1, C2. Que. What is the unit of Rx quality? Ans. BER (Bit error rate) Que. What is the range of Rx quality? Ans. 0-7 BER , but 0-4 is the optimal range. Que. What are the various reasons for hand over? Ans. Hand over occurs due to following reasons: 1. Due to signal strength. 2. Due to signal quality. 3. Due to timing advance. 4. Miscellaneous like due to low battery , or BTS power goes down. Que. What is the maximum value of BER? Ans. 12.5% Que. On what BPS does the mobile connection is done? Ans. 9600bps. Que. What are the range for various parameters? Ans. C/I Range 0-30 dbm Best -18 & above should be 12+ dBm. , Max. value is 25dBm. ARFCN-124 (max.) FER - Frame eraser report 0-4 max. value is 100. Que. What does last digit indicates in cell ID? Ans. Value for sector. Que. What is discontinuous transmission (DTx.)? Ans. Mechanism that allows radio transmitter to be switched off during speech pauses. Que. In idle mode what is the nature of channel used? Ans. Broadcast control channel. Que. On what BPS does GPS connection is done? Ans. 9600bps. Que. CGI comprises of what components? Ans. MCC+MNC+LAC+CI. Que. What is the name given to handover ,done in idle mode? Ans. Cell Reselection. Que. What does timing advance denotes? Ans. It denotes how far you are from particular site. Que. Which factor does MAIO & HSN decides? Ans. It decides in which order hopping frequencies are used Que.What does GPRS support mean? Ans. It means it supports multimedia transmission.
  • 2. Que. What is ARFCN? Ans. Absolute radio frequency channel number? Que. What is MAIO? Ans. Mobile allocation index offset. It decides starting number of hopping frequency, Range total num of tch fr-1 Que. What is HSN? Ans. Hopping sequence number. Hsn range 0-63, 0-cyclic hopping, 1-63 pn hopping Que. What is the maximum value of HSN Ans.1-63 Que. What is C/I? Ans. Co- channel interference. Que. What is C/A? Ans. Adjacent channel interference Que. What is BSIC? Ans. Base station identity code. Que. BSIC comprises of how many companies? Ans. MCC (0-7)+ NCC (0-7)