LTE Real Time Interview Question Answer 11-20

Q11 How you’ll do Cell Configuration?

Ans. To do cell configuration or activate a cell and configure SIB and MIB.
Just drag and drop “Activate cell”
A new window open “cell information” then do configuration
Note** A sample is present of cell config below.

Q12 Tell me the latest Bug you had found?

Ans. Reply with your bug (failure cause) (issue) you found during your test case executions.
For eg: In mac layer when i sent msg1 to ss and i am waiting for RAR. Once my DUT received RAR message it will send again msg1 instead of msg3.
After that i tried to identify the root cause of the occurred issue. During my analysis I had open the MAC Layer message and I found that Timing Advance (TA) value is missing that’s why my DUT send MSG1 again instead of MSG3.
For eg: In RRC layer we have configured 2 cells on SS, and we had reduced the power level of cell 1 and we aspect that our DUT will latch on cell 2. once it latches with cell 2 our DUT need to update security parameters behalf of kasme key, during my analysis I found an issue only with a parameter was not correct that is “key-set identifier == false” due to this problem was occurred. I have updated the same then reporting issue was resolved.

Q13 Which Tool you are using for debugging the Bugs? And their latest version?

Ans. Debugging a bug means analysis a bug. We have log analysis tool with the help of these tools we can identify the root cause of a bug. Each tool has Current/latest version, reply back with the Answer if someone ask you.

Q14 How to report a Bug to your concern person?

Ans. To report a bug we raise (generate) ticket and we have a tools like: Bugzila and jira. Fill the details them make a report and send to concern team.
A sample formate of Bugzila report is given below:

Q15 Sometime interviewer ask you, which Test Specification you’ll take help for Conformance Testing?

Ans. Reply back with 36.523-1. if your project on 4G Mac Layer, chapter 7.1 was using for Mac Layer related Conformance Testcases. If your project on RRC layer, then chapter 8. Remember actual test case id of your project. for 5G conformance testing perspective take reference from 38.523-1.

Q16 Difference between Functional, Conformance, Regression and Sanity Testing?

Ans. In Functional testing we do test of specific functions of particular layers.
But in conformance testing we do test of end to end all functions of particular layer.
In Regression testing if any test case is failed and software team update it you re-test of previous test case again that is called regression testing.
Sanity testing is a sub-part of regression testing in sanity testing we ensure that, codes are changes by development team working properly. We are not test whole test case or Build again just test only specific codes that are changes.

Q17 What is RF Calibration? Why need of RF Calibration for DUT after Flash?

Ans. After flashing, device don’t have any rf related parameter to latch with network. So we send our dut to rf calibaration team, they install rf related parameters like supporting band info, frequency info, RAT technology info in our dut. After RF calibration our dut is ready to latch network.

Q18 How many types of Flashing? How you’ll do Flash a Device?

Ans. To do flash a DUT we 2 types of flashing procedure: 1 simple flash, 2 via flashing softwares eg: Smart Phone Flash tool (SP tool), Joint Test Action Group (JTAG), Software Upgrade Tool (SUT), ODIN etc.

Q19 Name of Flash Tool you’re using in your lab?

Ans. Reply back with any tool you are using or any other tool you are using in your lab.

Q20 Why device not latch with network after Flashing?

Ans. Similar answer present in Que. 17, device not latch because of absence of Radio Parameters are not present in our newly flash DUT.