Top 5G Interview Question: 5G RACH Process

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Top 5G Interview Question: 5G RACH Process
In 5G, The RACH Process (Random Access) is very important especially in case of NSA since a 5G RACH failure in NSA results in a 5G Call Drop. In this session, we go through UE logs to understand various RACH Information Elements (IE) while explaining how UE decodes those IEs to find the RACH configuration and location.
The session also explains the basic RACH Issues that are observed in the networks along with potential troubleshooting and optimization actions.
Reference: 3GPP 38.211
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5G Call Flows (Session 1): How a 5G UE performs Initial Access
• 5G Call Flows (Session...
5G Call Flows (Session 3): 5G Drop Rate - How To Tackle 5G Call Drops
• 5G Call Flows (Session...
5G RSRP RSRQ SINR Conversion Mapping
• 5G RSRP RSRQ SINR Conv...

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4 окт 2024

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Комментарии : 38

@OurTechPlanet Год назад

For 5G topics discussed in 5G Job Interviews, check out the complete playlist below :) 🌐5G Interview Topics 💡ru-vid.com/group/PL4OXTttOk9WiLsz4fR62lpPcT3Wx3l5OP

@KAMLESHYADAV-vw8dj Год назад

Hi i m from India 🇮🇳 I m working in Ericsson Global I think this is best channel for me for telecom knowledge and also best for interview questions thanks a lot brother keep it I solute your hard work

@OurTechPlanet Год назад

Thanks Kamlesh, you just made my day! :)

@KAMLESHYADAV-vw8dj Год назад

@@OurTechPlanet I will try to make videos like you in Hindi so that we are transfer knowledge to max people because of in India English Language is the barrier for most people that belongs to village

@farhanejaz9911 7 месяцев назад

Salute to you Sir for such wonderful videos

@OurTechPlanet 6 месяцев назад

Thanks a lot :)

@rajeshkarra Год назад

Hi Ali, This was the simplest explanation with high precision. Can you please make a detailed video on RACH planning too. Thank You.

@OurTechPlanet Год назад

Thanks. RACH Planning is a topic that has been in my list for some time. Will work on it soon.

@dreambigwithomkara9787 Год назад

Its very helpful information...authentic and simple.....

@OurTechPlanet Год назад

Thanks a lot. Kindly do help us share the word :)

@saaz345 9 месяцев назад

HI Ali Khalid,Amazing explaination ,I must say you are my mentor as your way of explaination is fantastic and really help to get Network insights. my question is regarding MSG4 failure especially in SA configuration.what are the possible reason of MSG4 failure.and tips to mitigate it? upon successfull reception of MSG3 by GNB ,I belief MSG4 is the acknowledgement from the GNB to UE for the RACH complete. so if UE fail to recieve the MSG4 it will restart the rach process again?

@OurTechPlanet 9 месяцев назад

Yes, MSG4 failure would normally happen when UE is unable to decode the PDCCH or the PDSCH. One possible reason could be if MSG4 uses a more aggressive PDCCH aggregation layer than that could reduce the PDCCH's robustness. But in any case, it would need some UE side logs to verify the real reason.

@saaz345 7 месяцев назад

@@OurTechPlanet Thanks Ali

@ShivamPandey-km6rv Год назад

The excellent way of explanation...

@OurTechPlanet Год назад

Thanks a lot :)

@ihteshamullah3131 Год назад

Thanks a lot for this Great work .Sir...

@OurTechPlanet Год назад

You are welcome! :)

@anuragchakra 6 месяцев назад

Thanks nice clear explanation

@OurTechPlanet 6 месяцев назад

Glad it was helpful!

@andrewl3939 24 дня назад

How does ssb-perRACH-OccasionAndCB-PreamblesPerSSB and msg1-FDM factor in?

@nitsr6053 Год назад

very nice video

@OurTechPlanet Год назад

Thanks

@hitendramalik3093 10 месяцев назад

Hello Bro.One small question please.If Max RETX defined 4 or anyvalue it means that in every re TX UE will Increase Power or It will try with same power for ReTX number and when it failed than at end UE will increase power

@OurTechPlanet 10 месяцев назад

UE will increase power on every retransmission by the step size

@MrGmksamy Год назад

Hi, is it mandatory that LTE anchor and NSA cell should be configured with same RACH format to have proper sync ?

@OurTechPlanet Год назад

No, LTE anchor and 5G NSA Cell have no such constraint to have similar RACH format from sync perspective. Although it is good to have similar cell radius.

@georgioskarouzos7418 Год назад

Very helpful! Is Msg3 retransmitted in case that cannot be decoded by gNB or UE initiates new Rach procedure ? Thank you

@OurTechPlanet Год назад

Yes, MSG3 can be retransmitted.

@request_scudling 7 месяцев назад

Thanks for share, i think that the number of MSG2 is not always equal to MSG1 because there are some cases where the MSG2 is not sended ( MSG1 out of coverage , UE Cell radius bigger than configured cell radius ) or RAR window expired or MSG1 discarded because the number of MSG3 retransmission expired (in this case the MSG1 is counted but the MSG2 not sent)

@OurTechPlanet 7 месяцев назад

Yes, correct.

@georgioskarouzos7418 Год назад

All the preambles that a ue generates in a cell, with root sequence index and zero correlation zone have the same format. Is it correct? Thank you

@OurTechPlanet Год назад

Yes, within the cell, the format should be same.

@sankarthangaraj1 Год назад

Thanks a lot bro.if msg 3 fail due to dtx means what could be the possible actions to improve RACH

@OurTechPlanet Год назад

MSG3 DTX is the one of the most common problems but also one of the issues which can be caused by many different scenarios. So, mostly, it would need further troubleshooting. The main causes would be low MSG3 power, UEs in bad coverage, RACH planning conflicts, UEs too far away beyond the cell range.

@m.karthikeyan6482 Год назад

Hi..thanks for your effort🎉🎉 Really helpful for my career 🤝...do you know any contact about protocol testing course?..if means please give me .. thanks.

@OurTechPlanet Год назад

Thanks! Let me check around for any good courses.