Introduction to RACH Procedure in 5G

[@amitsardanayt]

Very clear video with minimum time wastage. Loved it

[@chaitug86able]

Highly impressed with the content and the presentation. Looking forward to see more videos

[@WirelessExplained]

Thank you! Will do!

[@ayushibhatt9518]

Thanks for such a brief video. Can you also make a separate video based on Zadoff Chu sequence, that would be incredibly helpful.

[@kirankumaryakkala]

Appreciate your presentation. The topic is neatly explained in a simplest way. I saw very few videos. Could you please cover more topics. Thanks

[@joeytsai5259]

Very very clear, thanks a lot！

[@yasinmiar3316]

Very well explained

[@thepromisedlan]

Thanks for the video, it was very clear! I have a question, does this mean there is a miniscule chance of two UEs ending up with the same C-RNTI, if the selected ue-identity is also the same?

[@kevinyuan6685]

Excellent video.

[@shan35178]

TC-RNTI is issued by gNB to UE in MSG2 first, not MSG4. The UE uses the TC-RNTI to scramble the uplink PUSCH message (MSG3).

[@WirelessExplained]

Agree. UE sends *ue-identity* as the unique identifier, not TC-RNTI. I have added this correction in the description. Thanks a lot for pointing this error 🙂

[@user-lu5wh1sw1i]

Very nice❤❤ thank you

[@rakshitverma5016]

excellent video

[@user-ov2iz5zt1g]

Excellent. It would be great to do the same for 4G. Thank you

[@Umer_Aftab]

Great

[@sukshithshetty8349]

When and where does RA-RNTI comes into picture???

[@sukshithshetty8349]

First Question, how will one UE know which Zad Off Chu seq was selected by other UE??

[@WirelessExplained]

UE will not know. In contention based RACH procedure, a UE randomly choose a Zadoff Chu sequence, without knowing if any other UE also has chosen the same.

[@sukshithshetty8349]

What is the use of Timing Advance?

[@WirelessExplained]

BS has to receive uplink signal from all UEs at the same time, i.e., time synchronized. So, far-away UEs transmit earlier than nearby UEs, so that all signals reach BS at the same time.

[@nitsr6053]

vey nice