NSN 3G RF engineer questionnaire

Note: It is supposed that you will answer the questions personally, without applying to other person’s help. Typical time, required for the answers approximately 40-60minutes.

Name: Ivanov Ivan

Date: 09/05/1945

1. Software Release for the 3G equipment, you’ve been worked with (NSN RAS06/RU10, Ericsson P5/6/7, etc)Answer:

2. How to perform traffic layering in 3G/2G networks. The task is to direct AMR calls from UMTS to GSM layer(Network), but keep PS traffic on UMTS layer. Offer a solution/ parameterization/ feature set. Answer:

3. In order to run new NodeB on air you have to prepare initial 3G-2G neighbor list, what is the preferred for you way to create it?Answer:

4. Do you have experience with performance data collection via NetAct OSS, using Report Builder/Report Explorer/ Reporting Suite. Is it OK for you to insert new report, edit formula, etc.Answer:

5. Do you have experience in the KPI formula checking. For example offers their formula for some KPI, is it easy for you to analyze formula for validity, offer enhancement, etc. Please give examples.Answer:

6. Performing drivetest:a. Our subcontractor should measure set of 10 KPIs. We have predefined set of the KPIs

and target values. You have to create a document describing how to do it, how many measurements should be done, which number to call, etc. Do you have experience creating such document. Please give examples when, where, etc.Answer:

b. Do you have experience analyzing DT logs using Actix, Nemo Analyze, TEMS family. Answer

c. Please give examples of the typical reasons for drop of AMR call Answer

7. Network planning using RNP tools – Asset, Atoll, NetActPlanner, TCPU, etc. Given: Live network 1000 NodeB on air, you need to integrate 100 NodeBs.

a. Have you ever created intra-system neighbor lists, what was the method and criteria used for this list preparation. Please provide details/examples Answer

b. PSC planning for new NodeBs for given conditions. Please provide details/examples Answer

c. Synchronisation tool database with live network. How to import values from OSS (e.g. RAC, LAC, etc.) into tool database. Answer

8. Skills with work NetAct PlanEditor. Please describe briefly how to prepare mass parameter modification .xml script using PlanEditor.

Answer9. General approaches for the antenna placement on the roof, where other operators’ antennas

located. What is the recommended isolation between antennas in cm/m/dB in horizontal/ vertical/ combined planeAnswer

10. 6 sectors site implementation comparing to 3 sectors. Please describe:a. Advantages of the solution (at least 3)

Answerb. Disadvantages and ways to decrease the negative effect (at least 3)

Answerc. Prerequisites for the placing 6 sectors site from hardware and construction point of view

Answer11. You have to organize 14.4 Mbps showcase. For example you got a request from customer team

to organize a press conference where we have to demonstrate HSDPA 14.4Mbps. We have a NodeB with 1 sector serving in the isolated from external interference room. The answer should cover all necessary preparation including checks in Core.

a. What should be ordered / prepared/ checked in order to reach success in the show case. Answer

b. What kind of default parameters should be tuned in order to improve the throughput, assuming that all parameters were set to defaultAnswer

3G Interview questions

1. Explain 3G?

2. What is 3GPP?

3. What is Generic Connection Framework (GCF )

4. Define FDMA TDMA,CDMA

5. Difference between CDMA and WCDMA

6. Difference between 3G and 2G

7. What is UMTS?

8. Difference between GERAN and UTRAN

9. what is Wcdma technology

10. 3GPP Specification for every layer

11. Benefit of spreading

12. Benefit of scrambling

13. What happen when Mobile switch on(Cell Search Procedure)

14. Mode of operations of RLC

15. Functions of RRC Layer

16. Functions of different MAC entities.

17. Information of all the system information

18. Channels and its mapping with different layers

19. What is channel

20. Role and architecture of RNC

21. How scrambling code is calculated

22. What are signaling radio bearer and there specific uses

23. Contents of Measurement control

24. Explain all seven Measurement reports

25. Differences between Rel99and HSDPA/HSUPA

26. What is Initial Direct Transfer

27. Explain the contents of Radio Bearer Reconfiguration. specify Dynamic and semi static part of Radio Bearer Reconfiguration

28. Explain soft , softer and Hard Handover

29. What is Compressed mode and why it is required

30. Explain HARQ and how it is different from ARQ