one of the best explanation of 5G SSB in youtube. I searched a lot for this concept but did not find any videos other than you such useful. Thanks to you for helping others
When doing initial Cell search , Ue does not know the SCS with which the Cell is deployed. So, how UE will SSB Blocks as its transmission in Time Domain depends on specific slots based on SCS. Whether UE need to capture samples twice with different symbol durations with SCS 15KHz and 30Khz separately to identify the SCS to proceed with further decoding of SSB?
It's not a single book, mentioned the sources in the description. References: [1] 5G NR: The Next Generation Wireless Access Technology [2] Understanding the 5G NR Physical Layer by Keysight Technologies [3] 3GGP Spec 38.213
Given the SSBs bandwidth 20 RBs then for different SCS 15k and 30k, the bandwidth is different. What is the reason for more bandwidth with the latter? thank you.
Information is carried over a sub carrier and hence over RBs. Therefore, you should assume RBs as the unit here instead of bandwidth. By having same RBs both cases can carry same amount of information.
@@dianamaamari9for 15k and 30k the slot timing is different ,shorter for the 30k and longer for the 15k .as we know shorter the time higher is the bandwidth .I hope this clears the confusion ..
could you please explain the case where n=,0,1,2,3 and Carrier frequency is greater than 3GHZ and SCS is 30KZ. if we apply 0, 1, 2, and 3 values one by one we will get four combination. what does it mean. also if we can have max 4 or 8 SSB occurrence 15KHZ. could you please explain the positions calculations for that
0,1,2,3 represents the SSB block position, it means there will be 4 SSB blocks. A Formula is given in spec to calculate the starting symbol number of different SSB blocks.
Also It would be really be great if you can tell in details about UE founding slot and subframe boundary in NR. Also how does it find the numerology used ?
there is a concept of Point A in NR which serves as a common reference point for resource block grids. There is one more term offsetToPointA which represents the frequency offset between point A and the lowest subcarrier of the lowest resource block, which has the subcarrier spacing provided by the higher-layer parameter subCarrierSpacingCommon and overlaps with the SS/PBCH block used by the UE for initial cell selection, expressed in units of resource blocks assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2. [Taken from section 4.4.4.2 of section 3GPP 38.211]
Thanks for this very informative video. Can you please also share/make a video on SSB position calculation using PointA, offsetToPointA, ssb_subcarrieroffset, absoluteFrequencySSB?
one of the best explanation of 5G SSB in youtube. I searched a lot for this concept but did not find any videos other than you such useful. Thanks to you for helping others
Thanks a lot for the appreciation 😊
@@curiousbeing8585 Totally agree with above comment! Truly appreciate the clarity you bring to these complex topics
When doing initial Cell search , Ue does not know the SCS with which the Cell is deployed. So, how UE will SSB Blocks as its transmission in Time Domain depends on specific slots based on SCS. Whether UE need to capture samples twice with different symbol durations with SCS 15KHz and 30Khz separately to identify the SCS to proceed with further decoding of SSB?
which book has been referred to for the video?
It's not a single book, mentioned the sources in the description. References:
[1] 5G NR: The Next Generation Wireless Access Technology
[2] Understanding the 5G NR Physical Layer by Keysight Technologies
[3] 3GGP Spec 38.213
those 4 symbols use 256 FFT, so why not 4096. Then, is symbol time different from others?
Pss ,sss,pbch, ssb positioning, subcarrier spacing. Nicely explain .
You have nailed it!
Given the SSBs bandwidth 20 RBs then for different SCS 15k and 30k, the bandwidth is different. What is the reason for more bandwidth with the latter? thank you.
Information is carried over a sub carrier and hence over RBs. Therefore, you should assume RBs as the unit here instead of bandwidth. By having same RBs both cases can carry same amount of information.
@@curiousbeing8585 but RB x SCS = BW, so its still a bit strange. Thank you for your reply.
@@dianamaamari9for 15k and 30k the slot timing is different ,shorter for the 30k and longer for the 15k .as we know shorter the time higher is the bandwidth .I hope this clears the confusion ..
could you please explain the case where n=,0,1,2,3 and Carrier frequency is greater than 3GHZ and SCS is 30KZ. if we apply 0, 1, 2, and 3 values one by one we will get four combination. what does it mean. also if we can have max 4 or 8 SSB occurrence 15KHZ. could you please explain the positions calculations for that
0,1,2,3 represents the SSB block position, it means there will be 4 SSB blocks. A Formula is given in spec to calculate the starting symbol number of different SSB blocks.
15KHz SCS can have both 4 and 8 SSB occurrence depending upon the carrier frequency. For more details you can refer section 4.1 of 38.213
@@curiousbeing8585 Thanks.
Also It would be really be great if you can tell in details about UE founding slot and subframe boundary in NR. Also how does it find the numerology used ?
At a time only BWP can be active for a UE. So Where does exactly SSB resides in particuar serving cell where mutiple BWP are supported
there is a concept of Point A in NR which serves as a common reference point for resource block grids. There is one more term offsetToPointA which represents the frequency offset between point A and
the lowest subcarrier of the lowest resource block, which has the subcarrier spacing provided by the higher-layer
parameter subCarrierSpacingCommon and overlaps with the SS/PBCH block used by the UE for initial cell
selection, expressed in units of resource blocks assuming 15 kHz subcarrier spacing for FR1 and 60 kHz
subcarrier spacing for FR2. [Taken from section 4.4.4.2 of section 3GPP 38.211]
SSB is located within each BWP, as UE uses SSB for Downlink measurements
Really going very good. As we can see one SSB itself takes 20 PRBs , does that mean minimum BW can be 5 Mhz with 15khz SCS ?
Also Is SSB per band ? or per serving cell ?
Thanks for this very informative video. Can you please also share/make a video on SSB position calculation using PointA, offsetToPointA, ssb_subcarrieroffset, absoluteFrequencySSB?
Hi can you share how we can identify location ssb in frequency domain?
U want to watch this video, if not already. ruclips.net/video/0oRzriQYqcg/видео.html
Good one... can u please add video for other layers also
Thanks a lot for appreciation. Please subscribe to the channel for more videos and share with your friends and colleagues to increase 5G knowledge.
Nice...want more videos on NR
Thanks a lot for appreciation. Please stay tuned for more videos
Good one keep it up!