For 5G topics discussed in 5G Job Interviews, check out the complete playlist below :) 🌐5G Interview Topics 💡th-cam.com/play/PL4OXTttOk9WiLsz4fR62lpPcT3Wx3l5OP.html
Me too absolutely agree with you...I was about to write the same thing and saw another person wrote..Wow I too just loved very nicely colourful and clear succinct explanation...Thank you for creating wonderful content..Please keep adding more content .. Subscribed just now 👍👌🏻🙂🌟
It is not so clear what you mean (at 01:20) with "consider a RB or a group of RB"? I mean, if I consider the 3 RE of PSS, it means that I have 1 symbol on 3 subcarriers for each resource block? Or, in other words, every group of REs of different color are repated every 12 subcarriers (every RB)? Thanks for clarification
Your explanation very easy to grab the things in presentation. Thanks for this easygoing. I have questions like PSS , SSS and DMRS information will be transmitted via which channel. In 4:1 case tdd it’s clear if it’s 8:1 than we also follow the channel structure same in time And frequency domain…
PSS and SSS are the first channels that UE needs to read to synchronize so these are read by the UE directly. The DMRS configuration is shared in RRC messages and then UE can read it directly as well during PDSCH allocations For TDD ratios, the general structure and purpose of physical channels is still same.
Thanks for sharing this. But per my understanding, the RE above or lower than PSS can't be used for PDSCH. It's empty. DMRS is also assigned to not only PBCH but also PDSCH, so UE can measure both SSB and PDSCH. Correct me if I am wrong. Thank you!
PDSCH DMRS are there in the snapshot (grey ones) but the difference is that PDSCH DMRS are only present when there is a DL data allocation while SSB DMRS are always present. PDSCH REs around PSS are usually not used as you mentioned.
Hi ... clear and to the point ... great video indeed !!! ... couple of questions I have, if you can kindly have time to answer ... 1. What does the 1st symbol of the UL slot (dark blue symbol) in the picture stand for ? .... 2. For the RACH, is there any specific reserved number of RBs ?
Thanks. The first symbol indicates DMRS but their location can change based on the configuration. For RACH, it depends on the format as different formats take different number of RBs. Usually, it can range from 3 RBs to 12 RBs.
The picture shows the implementation of PDCCH as when this was published, all implementations reserved first symbol for PDCCH. However, yes in NR it is based on coreset.
yes, it can be a single UE. If there are two UEs then the resources will be distributed among them. For instance UE1 might get the upper half of the band while UE2 might get the lower half of the band
For PDCCH 5G use new technology (CORESET) where unlike PDCCH unlike LTE doesnt aquire all the BW. But in you picture PDCCH “orange” is acquiring all the BW? Correct me please if im wrong
You are correct, 5G uses coreset and it is within BWP but the PDCCH can still span over the whole bandwidth. So, the figure is still correct but shows a particular scenario.
Mostly one or two symbols are used. SRS should be over the whole bandwidth so it is more of a frequency domain requirement rather than a time domain one.
As usual you are owsome.Thanks.In this vedio 1st symbol you mentioned for PDCCH but i heard in 5G there is concept of Corset also for that place for PDCCH can vary and it will not occupied entire BW in frequency domain?Please correct me?
You are right, it is possible in NR that PDCCH might not take the whole 1st symbol but in all implementations (when this videi was published), the PDCCH still took the whole 1st symbol.
Basically, in LTE we only talk about center frequency as the LTE SSS/PSS are always on the center frequency. But in NR, the SSS/PSS can be anywhere in the band so we have a difference between center frequency and PSS/SSS frequency
@@OurTechPlanet Is the interaction between base station (BS) and UE based on frames (10ms)? For example, BS fills up a frame and sends it to ue. However, I read other books saying that MAC is scheduled according to slot. Then why the interaction is frame, but the content of scheduling is slot, sorry, I am a beginner and can't understand the relationship between the two.
@@allenyang201 The structure here is shown as a frame but a UE is scheduled per slot. So, your understanding is correct that the BS will fill up a slot and send it to the UE and then fill up the next slot and send it to the UE again and so on
Your explanation is very good and simple...but here I think you showed the LTE PDCCH instead of NR PDCCH as the NR PDCCH is not always in the first three symbols and also... PDCCH is not continuous throughout total bandwidth as in LTE... concept of CORESET, BWP, comes into picture here in NR... correct me if I am wrong... anyways keep sharing the content.. it's interesting to listen
The PDCCH here means that the first symbol is occupied by PDCCH. Within that, it can follow the BWP concept if there are multiple BWPs and it will have coresets. But most common configuration is this where the first symbol is occupied by PDCCH only, provided there is no rate-matching! The concepts of coresets, BWPs, DCIs, Rate-Matching etc. will be covered in future sessions :)
@@OurTechPlanet In LTE it is clear that the PDCCH occupies always the first symbols. but Are you sure that NR PDCCH always occupies starting first(1,or 2,or 3) symbols and can't take anywhere in the other symbols like (4,5..etc)? i have this doubt for long time
@@EXCELLENTSHOTSVLOGS In most of the practical implementations, the PDCCH starts from the first symbol. However, the 3gpp parameter monitoringSymbolsWithinSlot under PDCCH Config does show all 14 symbols of the slot.
For 5G topics discussed in 5G Job Interviews, check out the complete playlist below :)
🌐5G Interview Topics
💡th-cam.com/play/PL4OXTttOk9WiLsz4fR62lpPcT3Wx3l5OP.html
Hum ffbc
This is the first time I have been able to understand how physical channels are transported in frame. Very clear. Thanks.
Glad to hear that! Means a lot :)
Me too absolutely agree with you...I was about to write the same thing and saw another person wrote..Wow I too just loved very nicely colourful and clear succinct explanation...Thank you for creating wonderful content..Please keep adding more content .. Subscribed just now 👍👌🏻🙂🌟
I had several 5G concepts in my head and you tied them together so brilliantly. Your video series is the best 5G training that I've seen.
Thanks, that is great to hear :)
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GT vdd tbm é fan do
Tá ☺️
Vou 🤠
Have been an avid reader of your blog. Glad to see the videos. Best of luck for the channel👍
Thank you for your kind words, Zain.
It is not so clear what you mean (at 01:20) with "consider a RB or a group of RB"? I mean, if I consider the 3 RE of PSS, it means that I have 1 symbol on 3 subcarriers for each resource block? Or, in other words, every group of REs of different color are repated every 12 subcarriers (every RB)?
Thanks for clarification
Actually SSB spans over 4 symbols and 20RBs. Within the SSB, the PSS and SSS take around 128 REs but they block around 12 RBs.
Hi, thanks for the explanation. Could you please explain why the DMRS channel is not mentioned in the uplink channel?
In the figure, the first symbol shows the UL DMRS
Very simplified! Thanks alot.. Waiting for a session on BWP & Coreset.
Thanks Naeem, will work on those topics soon!
Your explanation very easy to grab the things in presentation. Thanks for this easygoing.
I have questions like PSS , SSS and DMRS information will be transmitted via which channel.
In 4:1 case tdd it’s clear if it’s 8:1 than we also follow the channel structure same in time
And frequency domain…
PSS and SSS are the first channels that UE needs to read to synchronize so these are read by the UE directly. The DMRS configuration is shared in RRC messages and then UE can read it directly as well during PDSCH allocations
For TDD ratios, the general structure and purpose of physical channels is still same.
By far best video on this topic! thank you very much!
Thanks a lot , great to hear that!
One of the superb summarized way of some basic concepts descriptions
Thanks Arshad!
Thank you. This is an excellent video. One question, what is the column number 1 in the Uplink frame after SRS
Thanks. The first column after SRS signifies the PUSCH DMRS.
This is useful information. There are so such talking about 5G and this is timely information for anyone. Thanks for sharing.
Thanks Anthony! There is more on the way! :)
Thanks for sharing this. But per my understanding, the RE above or lower than PSS can't be used for PDSCH. It's empty. DMRS is also assigned to not only PBCH but also PDSCH, so UE can measure both SSB and PDSCH. Correct me if I am wrong. Thank you!
PDSCH DMRS are there in the snapshot (grey ones) but the difference is that PDSCH DMRS are only present when there is a DL data allocation while SSB DMRS are always present. PDSCH REs around PSS are usually not used as you mentioned.
Don't see anything Grey!
Hi ... clear and to the point ... great video indeed !!! ... couple of questions I have, if you can kindly have time to answer ... 1. What does the 1st symbol of the UL slot (dark blue symbol) in the picture stand for ? .... 2. For the RACH, is there any specific reserved number of RBs ?
Thanks. The first symbol indicates DMRS but their location can change based on the configuration. For RACH, it depends on the format as different formats take different number of RBs. Usually, it can range from 3 RBs to 12 RBs.
@@OurTechPlanet Thank you !!!!
The PDCCH in the picture is for LTE in 5G NR it occupy a portion or a totality of a CORESET that have no fix allocation
The picture shows the implementation of PDCCH as when this was published, all implementations reserved first symbol for PDCCH. However, yes in NR it is based on coreset.
Good job. Please tell us how to calculate dl/ul throughput from this frame
Take a look at this session
th-cam.com/video/Jz5g5sIU81U/w-d-xo.html
Is the frame in the video the interaction between one base station and one UE? What if the base station interacts with multiple UEs?
yes, it can be a single UE. If there are two UEs then the resources will be distributed among them. For instance UE1 might get the upper half of the band while UE2 might get the lower half of the band
Hi is there any difference in frame structure of FDD and Tdd in 5G.Pic u explained is of TDD R8?
Yes, this is the explanation for TDD. For FDD, you will have Downlink and Uplink on separate frequencies so there is no special subframe requirement.
For PDCCH 5G use new technology (CORESET) where unlike PDCCH unlike LTE doesnt aquire all the BW. But in you picture PDCCH “orange” is acquiring all the BW? Correct me please if im wrong
You are correct, 5G uses coreset and it is within BWP but the PDCCH can still span over the whole bandwidth. So, the figure is still correct but shows a particular scenario.
What is the maximum number of symbols used for SRS ? More symbols for SRS means better channel estimation ? Thank you
Mostly one or two symbols are used. SRS should be over the whole bandwidth so it is more of a frequency domain requirement rather than a time domain one.
As usual you are owsome.Thanks.In this vedio 1st symbol you mentioned for PDCCH but i heard in 5G there is concept of Corset also for that place for PDCCH can vary and it will not occupied entire BW in frequency domain?Please correct me?
You are right, it is possible in NR that PDCCH might not take the whole 1st symbol but in all implementations (when this videi was published), the PDCCH still took the whole 1st symbol.
Is a Ue informed about the PDCCH configuration (one, two or three symbols, aggregation level) by decoding MIB ? Thank you
The monitoringSymbolsWithinSlot IE gives this information.
Congratulations on the video! Very well explained.
Thanks Rafael!
Very helpful! I would like to ask about the location of CSI-RS in the frame. Is it located in special slots(dl symbols) like SRS? Thank you
No CSI-RS are usually located in normal slots.
Great one Ali.. 5G concepts made easy... please continue sharing more videos
Thanks Deep, it is great to hear from you :)
LTE uses only dl earfcn but 5G uses dl nr arfcn & sub nr arfcn . Pls explain
Basically, in LTE we only talk about center frequency as the LTE SSS/PSS are always on the center frequency. But in NR, the SSS/PSS can be anywhere in the band so we have a difference between center frequency and PSS/SSS frequency
Does each slot contain more than one SSB，I observed more than one SSB in one slot in the video
It depends on implementation. In some implementations, one slot only has one SSB while in another implementation, a slot can have 2 SSBs as well.
@@OurTechPlanet Is the interaction between base station (BS) and UE based on frames (10ms)? For example, BS fills up a frame and sends it to ue. However, I read other books saying that MAC is scheduled according to slot. Then why the interaction is frame, but the content of scheduling is slot, sorry, I am a beginner and can't understand the relationship between the two.
@@allenyang201 The structure here is shown as a frame but a UE is scheduled per slot. So, your understanding is correct that the BS will fill up a slot and send it to the UE and then fill up the next slot and send it to the UE again and so on
Plz detailed us on Resource Block
Sure, will make a session on RBs too
Thanks you for sharing knowledge 🙏
You are most welcome! :)
Excellent one. Hopefully expecting more videos from you. thank you
Thanks Raj. Next one coming tomorrow! :)
Awesome explanation, thanks for sharing 🙏
Glad it was helpful! :)
Your explanation is very good and simple...but here I think you showed the LTE PDCCH instead of NR PDCCH as the NR PDCCH is not always in the first three symbols and also... PDCCH is not continuous throughout total bandwidth as in LTE... concept of CORESET, BWP, comes into picture here in NR... correct me if I am wrong... anyways keep sharing the content.. it's interesting to listen
The PDCCH here means that the first symbol is occupied by PDCCH. Within that, it can follow the BWP concept if there are multiple BWPs and it will have coresets. But most common configuration is this where the first symbol is occupied by PDCCH only, provided there is no rate-matching! The concepts of coresets, BWPs, DCIs, Rate-Matching etc. will be covered in future sessions :)
@@OurTechPlanet In LTE it is clear that the PDCCH occupies always the first symbols. but
Are you sure that NR PDCCH always occupies starting first(1,or 2,or 3) symbols and can't take anywhere in the other symbols like (4,5..etc)?
i have this doubt for long time
@@EXCELLENTSHOTSVLOGS In most of the practical implementations, the PDCCH starts from the first symbol. However, the 3gpp parameter monitoringSymbolsWithinSlot under PDCCH Config does show all 14 symbols of the slot.
Many thanks and appreciated dear
You are very welcome
Great explanation ! LOVED it
Glad you liked it!
Congratulations. Perfect explanation.
Glad it was helpful!
Good explanation. Thanks
You are welcome :)
Can you please share beam forming and massive MIMO concepts in 5G
Here it is, 5G Massive MIMO Made Simple
th-cam.com/video/EDcfkegcIHs/w-d-xo.html
Thank you! 😊
You're welcome 😊
Is it a TDD frame?
Yes, this is a TDD sample
amazing explanation but please need some more detail on the basis of timeslot
Ok, will add that to the pipeline
Superb break down 👍
Thanks Walter :)
Dear khalid, pleese share pdf or powerpoint file of your youtube videos. Thanks for your excellent trainings.
Unfortunately, we do not share the slides. Thanks for understanding.
Excellent. Precisely explained
Thanks, Mudassar.
What is dark blue REs?
You mean in the downlink frame? That is PDSCH.
In uplink, the dark blue ones are DMRS
Very well explained 👏
Thanks :)
Good explanation.
Glad you liked it :)
Good work
Thanks :)
Very Nice Video.
Thanks!
Thank you sir.. It is a great video
Most welcome :)
Easy and simple🥰
Thanks Kamal!
Zindabad Ustaad!
Thanks :)
thank you sir
Welcome!
Yes!
Ok
oh you start video as well great help
Yeah we did. Great to know that it is helpful :)
awesome
Thanks
WHERE IS CSI-RS?
CSI-RS are not explained. I discussed about CSI-RS in the Massive MIMO video and the SINR video.
genius！
Thanks :)