5G DL Reference Signal: 5G CSI-RS Channel State Information Part 2/2

This Video covers most of the related aspects of the 5G CSI-RS Channel State Information Reference Signal. The below is covered in this video.
Content:
1-CSI-RS Main Parameters ”Layer 3 messages”
2-FREQUENCY & Time DOMAIN STRUCTURE OF CSI-RS CONFIGURATIONS
3-CSI Reference Signal Planning
Working Materials uploaded to the below link
www.mohamedeladawi.com/learn-...

[@farshadesmaeli755]

Very informative. thank you

[@mohamedeladawiashour]

I am glad to hear that, thanks a lot

[@user-fq9zt6pj7m]

This video is absolutely what I want. I have a question. At 26:26, I don't understand why 4 bits are required for Row1. I think that 2 bit is sufficient to indicate (2,6,10) because Density=3 is given.

[@mohamedeladawiashour]

Great to hear that. Your question is quite interesting. The number of row1 bits specified According to the 3GPP standard. However, based on my logical understanding, I believe it should be 4 bits. The rationale behind this is the formula used to calculate the frequency position. In Row 1, the density is 3, and the frequency allocation formula is k, k+4, k+8. The value of k is identified based on the bit position, which in this case have 4 scenarios can be 1000 (k = 0), 0100 (k=1), 0010 (k=2), and 0001 (k=3). If you apply each of these positions, it will result in the following.
K K+4 K+8
K= 0 0 4 8
K= 1 1 5 9
K= 2 2 6 10
K= 3 3 7 11

[@umeshtailor8173]

Can you please explain the calculation of sub carrier number which will contain the CSI-RS using frequencydomainAllocation IE .
Like how it became 4,5,6,7 for Row=4 , 010 ?? Similarly please explain for row=5 also

[@mohamedeladawiashour]

Hi please refer to page 227 to 229 in 5G Nr in bullets

[@infotechtvtyagi3953]

Very good video

[@mohamedeladawiashour]

Thanks, I am glad to hear that

[@ahmedashour9254]

Thank you

[@mohamedeladawiashour]

Thanks a lot

[@nishachamp4608]

At 27:23, the example for 4 port resource, why is the bit position multiplied by 4? Where does the 4 come from?

[@mohamedeladawiashour]

My study is mainly based on 5G NR in bullets page 227 to 229 for this part you may refer to 3GPP (
(ts_138211v160200p)Authors to get the answer about the standard; i am worry that my answers will only based on common sense and logic but it might not be accurate since this kind of questions are more about the standard.

[@spalinjo87]

Hi Mohamed, thanks for video.
Just one question regarding examples for raw1 and raw2. Per my understanding, bits reading should go from right to left, so in your case it should be for raw1 k=1,5, 9 and for raw2 k=9.

[@mohamedeladawiashour]

Thanks. For the Raw1 example where I mention FrequencyDomainAllocatoin = 0010, this means K0 is equal to the bit position = 2 (moving from Left to right, starting from 0 then 0 then 1), then this will be applied in the 3GPP Table to calculate K possible positions, K = K0, K0 + 4, K0 + 8, This means raw1 K will be equal to 2,6 and 10 and the same concept applied for Raw2. If you would like to check more examples in detail refer to pages 227 to 229 in 5G NR in Bullets.

[@spalinjo87]

@@mohamedeladawiashour Thanks for clarification. I see the same in 5G NR in Bullets. Looks like exampels from sharetechnote are wrong for that particular bit reading

[@filthykid84]

if you could emphasize more on PDSCH/CSI beams .. how they are working?

[@mohamedeladawiashour]

Hi, I am working on a video for detailed description about PDSCH in general, i will try to cover the part you mentioned

[@filthykid84]

@@mohamedeladawiashour that is awesome, yes like PDSCH layers/CSI layers-beams ... i get confused between them ... would CSI beam means like PDSCH beam ... are they same or different? would be great : ))))

[@MrSaurabhBhardwaj]

Thanks for such an useful info and video.
I have a small question, what is this IE "qcl-InfoPeriodicCSI-RS 0" for in csi-MeasConfig.
Also if density is not mentioned, what will be the CSI-RS density ?
I see "density three : NULL".
Thanks in advance!!

[@mohamedeladawiashour]

Hi Saurabh, Sorry for the late reply. I am not very aware about QCI-InfoPerioidicCSR-RS; I have found some information about this part in 5G ShareTechnote blog, qcl-InfoPeriodicCSI-RS : For a target periodic CSI-RS, which contains a reference to one TCI-State in TCI-States for providing the QCL source and QCL type. For periodic CSI-RS, the source can be SSB or another periodic-CSI-RS. Refers to the TCI-State, which has this value for tci-StateId and is defined in tci-StatesToAddModList in the PDSCH-Config included in the BWPDownlink corresponding to the serving cell and to the DL BWP to which the resource belongs to. But in general, the TCI State subject is a very deep topic and needs to be covered in detail (In my plan). For the 2nd part, As per my understanding, density Three: Null means Density is three, but in all cases, Density should be explicitly mentioned, and even if we assume it is not mentioned, UE still can calculate it based on Frequencydomainallocation parameter and will map it with the 3GPP Table shared in slide 15 ad by the way, Density three is only applicable for CSI RS Used for TRS, Otherwise probably it will be only 1

[@MrSaurabhBhardwaj]

Thanks!!@@mohamedeladawiashour